WO2019010681A1 - Dispersion compensation method and apparatus - Google Patents
Dispersion compensation method and apparatus Download PDFInfo
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- WO2019010681A1 WO2019010681A1 PCT/CN2017/092853 CN2017092853W WO2019010681A1 WO 2019010681 A1 WO2019010681 A1 WO 2019010681A1 CN 2017092853 W CN2017092853 W CN 2017092853W WO 2019010681 A1 WO2019010681 A1 WO 2019010681A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
Definitions
- the present application relates to the field of optical fiber communication technologies, and in particular, to a dispersion compensation method and apparatus.
- the direct detection technology uses the light intensity carrying information to transmit to the receiving end, so that the receiving end converts the optical signal into an electrical signal after receiving the optical signal.
- the problem of fiber dispersion When applying direct detection technology in short-distance optical communication, the problem of fiber dispersion must be considered. That is, the optical signal transmitted by the transmitting end is transmitted to the receiving end after being transmitted through the optical fiber, and the dispersion generated by the optical fiber transmission causes the electrical signal after the conversion of the receiving end. Power fading occurs.
- the commonly used method for solving fiber dispersion is mainly for an application scenario in which a transmitting end communicates with a receiving end, and the transmitting end compensates a pre-configured dispersion compensation value for the electrical signal, and then converts the compensated electrical signal into an optical signal. Send to the receiving end to solve the problem of fiber dispersion.
- the embodiment of the present application provides a dispersion compensation method and device to solve the fiber dispersion problem in an application scenario in which a transmitting end communicates with multiple receiving ends.
- the embodiment of the present application provides a dispersion compensation method, where the method can be applied to a transmitting end, the transmitting end communicates with at least two receiving ends, and the transmitting end and the at least two receiving ends
- the method includes: the sending end acquires a subcarrier allocation result, where the subcarrier allocation result includes a signal that is based on a signal transmitted between the sending end and the at least two receiving ends
- the noise ratio result is a subcarrier allocated by the at least two receiving ends.
- the transmitting end performs dispersion compensation on the subcarriers allocated to the receiving end corresponding to different communication distances according to the correspondence between the communication distance and the dispersion compensation value.
- the foregoing solution provides a fiber dispersion solution for an application scenario in which a transmitting end communicates with multiple receiving ends. Since the communication distance between the transmitting end and the different receiving end is different, the generated dispersion is different, thereby requiring The dispersion compensation value is different. Compared with the dispersion compensation method in the prior art, the same dispersion value is compensated for different transmission distances. In the embodiment of the present application, the dispersion value corresponding to the transmission distance is compensated for each transmission distance, which effectively alleviates one.
- the fading phenomenon caused by fiber dispersion in the application scenario where the transmitting end communicates with multiple receiving ends helps to improve the performance of the optical communication system.
- the sending end when the sending end obtains the subcarrier allocation result, the sending end may be implemented by: sending, by the sending end, the detecting to the at least two receiving ends respectively on the multiple subcarriers included in the preset carrier a signal, and receiving a signal to noise ratio result determined by the detection signal sent by each of the at least two receiving ends; the signal to noise ratio result includes a corresponding one of each of the preset carriers Signal to noise ratio value.
- the transmitting end determines that the first signal to noise ratio value corresponding to the i th subcarrier in the preset carrier is the largest one of the plurality of signal to noise ratio values corresponding to the i th subcarrier;
- the signal to noise ratio result of a signal to noise ratio value is sent by the first receiving end;
- the number is not greater than a positive integer of the number of subcarriers included in the preset carrier.
- the transmitting end then allocates the ith subcarrier to the first receiving end, and the first receiving end is any one of at least two receiving ends.
- the transmitting end can ensure that the signal-to-noise ratio corresponding to each sub-carrier after being allocated is the largest among the multiple SNR values corresponding to the sub-carrier, thereby contributing to improving system performance.
- the sending end obtains the subcarrier allocation result, and may be implemented by: sending, by the sending end, the detecting to the at least two receiving ends respectively on the multiple subcarriers included in the preset carrier a signal, and receiving a signal to noise ratio result determined by the detection signal sent by each of the at least two receiving ends; the signal to noise ratio result includes a corresponding one of each of the preset carriers Signal to noise ratio value.
- the transmitting end determines that the second signal to noise ratio value corresponding to the jth subcarrier in the preset carrier is the largest of the plurality of signal to noise ratio values corresponding to the jth subcarrier;
- the signal to noise ratio result of the second signal to noise ratio is sent by the second receiving end; the j is taken over a positive integer not greater than the number of subcarriers included in the preset carrier. And assigning the jth subcarrier to the second receiving end.
- the transmitting end determines a sum of signal to noise ratio values corresponding to the respective subcarriers allocated to the second receiving end, and determines a signal to noise ratio value corresponding to each subcarrier allocated to the third receiving end.
- the second receiving end and the third receiving end are any two of the at least two receiving ends.
- the transmitting end adjusts when the difference between the sum value corresponding to the subcarrier allocated to the second receiving end and the sum value corresponding to the subcarrier allocated to the third receiving end exceeds a preset range a subcarrier allocated to the second receiving end and a subcarrier allocated to the third receiving end, such that a sum value corresponding to the subcarrier allocated to the second receiving end is allocated to the third receiving end
- the difference between the sum values corresponding to the subcarriers is within a preset range.
- the difference between the sum value corresponding to the subcarrier allocated to the second receiving end and the subcarrier corresponding to the third receiving end is not exceeded by the sending end.
- the subcarriers allocated to the second receiving end and the subcarriers allocated to the third receiving end are no longer adjusted.
- the transmitting end may ensure that the difference between the sum value corresponding to the subcarrier allocated to the second receiving end and the sum value corresponding to the subcarrier allocated to the third receiving end is in a preset signal to noise ratio range. Therefore, since the signal-to-noise ratio value is inversely proportional to the error rate, the difference between the error rate of the second receiving end and the error rate of the third receiving end is within a preset error rate range, which is helpful for improvement. System performance.
- the obtaining, by the sending end, the subcarrier allocation result may be implemented by: sending, by the sending end, the detecting signals to the at least two receiving ends on the multiple subcarriers included in the preset carrier, and receiving a signal to noise ratio result determined by the detection signal sent by each of the at least two receiving ends; the signal to noise ratio result includes a signal to noise ratio value corresponding to each subcarrier in the preset carrier .
- the transmitting end determines that the second signal to noise ratio value corresponding to the jth subcarrier in the preset carrier is the largest of the plurality of signal to noise ratio values corresponding to the jth subcarrier;
- the signal to noise ratio result of the second signal to noise ratio is sent by the second receiving end; the j is taken over a positive integer not greater than the number of subcarriers included in the preset carrier.
- the transmitting end allocates the jth subcarrier to the second receiving end. Afterwards, the transmitting end determines a modulation format corresponding to each subcarrier according to the subcarrier allocated for the second receiving end and the subcarrier allocated for the third receiving end, and determines the transmission of the second receiving end according to the modulation format corresponding to each subcarrier.
- the capacity and the transmission capacity of the third receiving end determine whether the transmission capacity of the second receiving end or the transmission capacity of the third receiving end meets the system requirement. If it is determined that the transmission capacity of the second receiving end or the transmission capacity of the third receiving end does not meet the system requirement, the transmitting end adjusts the subcarrier allocated to the second receiving end and the subcarrier allocated to the third receiving end according to the system requirement, so that the adjusted second The transmission capacity of the receiving end meets the system requirements, and the adjusted transmission capacity of the third receiving end meets the system requirements. After determining that the adjusted transmission capacity of the first receiving end and the adjusted transmission capacity of the second receiving end satisfy the system requirements, the transmitting end does not adjust the subcarrier allocated to the second receiving end and The subcarrier allocated for the first receiving end.
- the transmitting end may further determine the transmission capacity of the adjusted second receiving end and the adjusted transmission capacity of the third receiving end. Whether the difference is within the preset transmission capacity range. If it is determined that the difference between the adjusted transmission capacity of the second receiving end and the adjusted transmission capacity of the third receiving end exceeds the preset transmission capacity range, the transmitting end adjusts to the subcarrier allocated by the second receiving end and is the third receiving The subcarriers allocated by the terminal are such that the difference between the adjusted transmission capacity of the second receiving end and the adjusted transmission capacity of the third receiving end is within a preset transmission capacity range. If the difference between the transmission capacity of the first receiving end and the adjusted transmission capacity of the second receiving end is within the preset transmission capacity, the transmitting end is no longer adjusted to the subcarrier allocated by the second receiving end. And a subcarrier allocated for the first receiving end.
- the transmitting end may make the transmission capacity of the second receiving end and the transmission capacity of the third receiving end satisfy the system requirement, and make the difference between the transmission capacity of the second receiving end and the transmission capacity of the third receiving end be at the preset transmission capacity. Scope, which helps to improve system performance.
- the transmitting end respectively sends the information to the transmitting end.
- a signal of each of the at least two receiving ends is subjected to Fourier transform. And then mapping the Fourier-transformed signal sent to the fourth receiving end to the dispersion-compensated sub-carrier allocated to the fourth receiving end, and performing inverse Fourier transform on the mapped signal and transmitting
- the fourth receiving end is any one of the at least two receiving ends.
- the transmitting end transmits the Fourier transform to the fourth receiving end.
- the signal is mapped to the sub-carrier allocated for the fourth receiving end and is subjected to dispersion compensation, which helps to alleviate the fading phenomenon of the electrical signal received by the fourth receiving end.
- the transmitting end may also perform the dispersion compensation on the subcarriers allocated to the receiving end corresponding to different communication distances according to the correspondence between the communication distance and the dispersion compensation value (that is, the transmitting end is allocated to the child allocated to the fourth receiving end.
- the time domain signal sent to the fourth receiving end is Fourier transformed.
- the Fourier transformed signal transmitted to the fourth receiving end is then mapped onto the subcarriers allocated for the fourth receiving end.
- the signal after mapping the subcarriers is compensated for the dispersion compensation value corresponding to the communication distance between the fourth receiving end and the transmitting end (corresponding to the subcarrier compensation allocated to the fourth receiving end between the fourth receiving end and the transmitting end) The dispersion compensation value corresponding to the communication distance).
- the compensated signal is subjected to inverse Fourier transform and then sent to the fourth receiving end.
- the transmitting end compensates the dispersion compensation value corresponding to the communication distance between the fourth receiving end and the transmitting end for the signal after mapping the subcarrier, which helps to alleviate the fading phenomenon of the electrical signal received by the fourth receiving end.
- the embodiment of the present application provides a dispersion compensation apparatus, where the apparatus is applied to a transmitting end, the transmitting end communicates with at least two receiving ends, and the transmitting end and the at least two receiving ends The communication distance is different, the device includes: an allocation unit, configured to acquire a subcarrier allocation result, where the subcarrier allocation result includes a signal and noise based on a signal transmitted between the transmitting end and the at least two receiving ends The result is a subcarrier allocated to the at least two receiving ends; a compensation unit, configured to allocate, according to a correspondence between the communication distance and the dispersion compensation value, a different communication distance included in the subcarrier allocation result acquired by the allocation unit The corresponding subcarriers of the receiving end perform dispersion compensation.
- the allocating unit is specifically configured to receive each of the at least two receiving ends And a signal to noise ratio result of the signal transmitted between each of the receiving end and the transmitting end, and the signal to noise ratio result sent by the at least two receiving ends is allocated to the at least two receiving ends Subcarrier.
- the allocating unit is configured to send a sounding signal to the at least two receiving ends on the plurality of subcarriers included in the preset carrier, and receive each of the at least two receiving ends.
- a signal to noise ratio result determined by the receiving end based on the detection signal; the signal to noise ratio result includes a signal to noise ratio value corresponding to each subcarrier in the preset carrier.
- the first signal to noise ratio value corresponding to the i th subcarrier in the preset carrier is the largest one of the plurality of signal to noise ratio values corresponding to the i th subcarrier; wherein the first signal to noise ratio is included
- the signal to noise ratio result of the value is sent by the first receiving end; the i is taken over a positive integer not greater than the number of subcarriers included in the preset carrier.
- the ith subcarrier is then allocated to the first receiving end, and the first receiving end is any one of at least two receiving ends.
- the allocating unit is configured to send a sounding signal to the at least two receiving ends on the plurality of subcarriers included in the preset carrier, and receive each of the at least two receiving ends.
- a signal to noise ratio result determined by the receiving end based on the detection signal; the signal to noise ratio result includes a signal to noise ratio value corresponding to each subcarrier in the preset carrier.
- the second signal-to-noise ratio value corresponding to the j-th sub-carrier determines, by the second signal-to-noise ratio value corresponding to the j-th sub-carrier, the second signal-to-noise ratio corresponding to the j-th sub-carrier; wherein the second signal-to-noise ratio is included
- the signal-to-noise ratio result of the value is sent by the second receiving end; the j takes a positive integer not greater than the number of subcarriers included in the preset carrier, and allocates the jth subcarrier to the first Two receiving ends.
- the second receiving end and the third receiving end are any two of the at least two receiving ends.
- the apparatus further includes a Fourier transform unit and an inverse Fourier transform unit.
- the Fourier transform unit is configured to send, to the compensation unit, the dispersion to the subcarriers corresponding to the receiving end corresponding to different communication distances according to the correspondence between the communication distance and the dispersion compensation value, and then send the The signal at each of the two receiving ends is Fourier transformed.
- the compensation unit is further configured to map, by the Fourier transform unit, the signal transformed by the Fourier transform unit to the fourth receiver, and the dispersion-compensated subcarrier, the The four receiving ends are any one of the at least two receiving ends.
- the inverse Fourier transform unit is configured to perform inverse Fourier transform on the signal mapped by the compensation unit, and then send the signal to the fourth receiving end.
- the Fourier transform unit is configured to send to the compensation unit according to the correspondence between the communication distance and the dispersion compensation value, before performing dispersion compensation on the subcarriers allocated to the receiving end corresponding to different communication distances.
- a signal of each of the at least two receiving ends is subjected to Fourier transform;
- the allocating unit is further configured to map the signal transformed by the Fourier transform unit sent to the fourth receiving end to the On the subcarrier allocated by the fourth receiving end, the fourth receiving end is any one of the at least two receiving ends;
- the compensation unit is configured to allocate according to the correspondence between the communication distance and the dispersion compensation value.
- the inverse Fourier transform unit is configured to perform inverse on the compensated signal of the compensation unit After the Fourier transform to a fourth reception end.
- the embodiment of the present application further provides a sending end, where the sending end communicates with at least two receiving ends, and a communication distance between the sending end and the at least two receiving ends is different.
- the transmitting includes a processor for storing a software program, the processor for reading a software program stored in the memory and implementing the method provided by any one of the first aspect or the first aspect above .
- the embodiment of the present application further provides a computer storage medium, where the software program stores a software program, where the software program can implement the first aspect or the first one when being read and executed by one or more processors Any of the aspects provided by the design.
- an embodiment of the present application provides a computer program product comprising instructions, when executed on a computer, causing a computer to perform the method provided by any one of the above first aspect or the first aspect.
- FIG. 1 is a schematic structural diagram of a communication system according to an embodiment of the present application.
- FIG. 2 is a schematic diagram of a signal to noise ratio result of an electrical signal converted by each receiving end of three receiving ends according to an embodiment of the present disclosure
- FIG. 3 is a schematic diagram of signal to noise ratio results corresponding to three receiving ends according to an embodiment of the present disclosure
- FIG. 4 is a schematic diagram of a result of dividing a frequency band by a transmitting end for three receiving ends according to an embodiment of the present disclosure
- FIG. 5 is a schematic structural diagram of a dispersion compensation apparatus according to an embodiment of the present disclosure.
- FIG. 6A is a comparison diagram of a signal to noise ratio after a dispersion compensation value corresponding to 80 km and a dispersion compensation value corresponding to 40 km are respectively compensated for a receiving end with a communication distance of 80 km according to an embodiment of the present disclosure
- FIG. 6B is a comparison diagram of a signal to noise ratio after a dispersion compensation value corresponding to 40 km and a dispersion compensation value corresponding to 80 km are respectively compensated for a receiving end with a communication distance of 40 km according to an embodiment of the present disclosure
- FIG. 6C is a comparison diagram of a signal to noise ratio after a dispersion compensation value corresponding to 80 km and a dispersion compensation value corresponding to 60 km are respectively compensated for a receiving end with a communication distance of 80 km according to an embodiment of the present disclosure;
- 6D is a comparison diagram of signal to noise ratios after the compensation end of the communication distance of 40 km is compensated for the dispersion compensation value corresponding to 40 km and the dispersion compensation value corresponding to 60 km, respectively, provided by the embodiment of the present application;
- FIG. 7 is a schematic structural diagram of a short-distance optical communication system according to an embodiment of the present disclosure.
- FIG. 8A is a schematic structural diagram of a DDMZM according to an embodiment of the present disclosure.
- FIG. 8B is a schematic diagram of a power modulation curve of a DDMZM according to an embodiment of the present application.
- FIG. 9 is a schematic flowchart diagram of a dispersion compensation method according to an embodiment of the present disclosure.
- FIG. 10 is a schematic diagram of a signal to noise ratio result of a first receiving end and a signal to noise ratio result of a second receiving end according to an embodiment of the present application;
- FIG. 11 is a schematic diagram of a subcarrier allocated by a transmitting end to a first receiving end, and a subcarrier allocated by a transmitting end to a second receiving end according to an embodiment of the present disclosure
- FIG. 12 is a comparison diagram of system capacity when the transmission end solves the fiber dispersion problem by using the existing solution 1 and the existing solution 2 and the dispersion compensation method provided by the embodiment of the present application;
- FIG. 13 is a diagram showing a bit error rate-signal-to-noise ratio corresponding to a receiving end when performing dispersion compensation by the prior art point-to-point dispersion compensation method according to the prior art and the dispersion compensation method provided by the embodiment of the present application. a comparison chart of the curves;
- FIG. 14 is a schematic structural diagram of a dispersion compensation apparatus according to an embodiment of the present disclosure.
- FIG. 15 is a schematic structural diagram of a terminal implementation manner according to an embodiment of the present disclosure.
- a communication system provided by an embodiment of the present application.
- the system includes a sender and multiple receivers.
- the communication distance between the transmitting end and the plurality of receiving ends is different.
- one transmitting end and three receiving ends are taken as an example.
- power fading occurs due to fiber dispersion.
- the situation in which power fading occurs is different.
- the communication distance between the transmitting end and the first receiving end is 10 km
- the communication distance between the transmitting end and the second receiving end is 40 km, between the transmitting end and the third receiving end.
- the communication distance is 80 km
- the transmitting end transmits optical signals to the three receiving ends on the plurality of subcarriers included in the carrier whose frequency range is [0, 36] GHz.
- the optical signals transmitted by the transmitting end are respectively transmitted to the three receiving ends after being transmitted through the optical fiber, and the three receiving ends respectively convert the received optical signals into electrical signals. Referring to FIG. 2, each receiving end of the three receiving ends is converted.
- the signal-to-noise ratio of the subsequent electrical signal results in a signal-to-noise ratio corresponding to each subcarrier in the carrier having a frequency range of [0, 36] GHz. It can be seen from FIG. 2 that the signal-to-noise ratio values of the receiving ends of different communication distances are not the same for the same subcarrier. That is to say, for the same subcarrier, the power fading corresponding to the receiving end of different communication distances is different.
- the existing solution 1 for the receiving end of different communication distances, whether the signal-to-noise ratio of the receiving end exceeds a preset threshold to divide the frequency band, and the signal-to-noise ratio exceeds a preset threshold to consider that the frequency band is available. If the signal-to-noise ratio does not exceed the preset threshold, the frequency band is considered unusable, so as to avoid transmitting the optical signal to the receiving end in a frequency band with a relatively bad fading condition, thereby solving the problem of fiber dispersion.
- the communication distance between the transmitting end and the first receiving end is 25 km
- the communication distance between the transmitting end and the second receiving end is 50 km
- the transmitting end The communication distance with the third receiving end is 100 km.
- the carrier frequency band that can be used for communication between the transmitting end and the receiving end is [0, 10] GHz.
- the signal-to-noise ratio results corresponding to the three receiving ends are respectively shown.
- the frequency band corresponding to the signal-to-noise ratio value exceeding -3db is [0, 5.9] GHz, so the first receiving end can use the frequency band [0, 5.9] GHz; similarly, the second receiving end can use the frequency band [ 0, 4.2] GHz and [9, 10] GHz, and the band [4.2, 9] GHz cannot be used.
- the third receiving end can use the bands [0, 2.9] GHz and [6.3, 9] GHz instead of the bands [2.9, 6.3] GHz and [9, 10] GHz. Referring specifically to FIG. 4, the result of dividing the frequency band for the three receiving ends at the transmitting end.
- the signal-to-noise ratio of the first receiving end in the frequency band [5.9, 6.3] GHz is less than -3 db, so The first receiving end cannot use the frequency band [5.9,6.3] GHz; the second receiving end has a signal-to-noise ratio value of less than -3 db in the frequency band [5.9, 6.3] GHz, so the second receiving end cannot use the frequency band as [5.9, 6.3] GHz; the signal-to-noise ratio of the third receiver at the band [5.9, 6.3] GHz is also less than -3 db, so the third receiver can also use the band [5.9, 6.3] GHz. Therefore, the band is [5.9, 6.3] GHz is not available, resulting in wasted resources.
- the transmitting end compensates a pre-configured dispersion compensation value for the electrical signal, and then converts the compensated electrical signal into an optical signal for transmission to the receiving.
- the transmitting end compensates a pre-configured dispersion compensation value by the dispersion compensation module, and then passes through a digital-to-analog converter (English: digital to analog converter, DAC) and parallel two-electrode Mach. Del modulator (English: dual-drive mach-zehnder modulator, Abbreviation: DDMZM) Converts the dispersion-compensated electrical signal into an optical signal.
- the transmitting end sends the converted optical signal to the receiving end through a single mode fiber (English: single mode fiber, SMF for short), so that the receiving end passes the filter and the optical receiving module after receiving the optical signal (English: Receiver optical) Sub assembly, referred to as: ROSA), oscilloscope (English: oscilloscope, abbreviation: OSC) and digital signal processing module (English: digital signal process, referred to as: DSP) converts the received optical signal into an electrical signal.
- a single mode fiber English: single mode fiber, SMF for short
- OSC oscilloscope
- DSP digital signal processing module
- the communication distance between the transmitting end and the first receiving end is 80 km
- the communication distance between the transmitting end and the second receiving end is 40 km.
- the same dispersion compensation value is compensated.
- the compensated dispersion compensation value is a dispersion compensation value corresponding to 40 km, as shown in FIG. 6A
- the signal-to-noise ratio result of the signal received by the first receiving end after compensating for the dispersion compensation value corresponding to 40 km corresponds to the compensation of 80 km.
- the signal-to-noise ratio results of the received signals after the dispersion compensation value Comparing the signal-to-noise ratio results of the received signals after the dispersion compensation value, it can be seen that when the dispersion compensation value corresponding to 40 km is compensated for the first receiving end, the signal received by the first receiving end still generates due to insufficient compensation. Power fading.
- the compensated dispersion compensation value is a dispersion compensation value corresponding to 80 km, as shown in FIG. 6B, the signal-to-noise ratio result of the signal received by the second receiving end after compensating the dispersion compensation value corresponding to 40 km corresponds to the compensation of 80 km.
- the signal-to-noise ratio results of the received signals after the dispersion compensation value Comparing the signal-to-noise ratio results of the received signals after the dispersion compensation value, it can be seen that when the dispersion compensation value corresponding to 80 km is compensated for the second receiving end, the signal received by the second receiving end is still generated due to excessive compensation. Power fading.
- the compensated dispersion compensation value is a dispersion compensation value corresponding to 60 km, as shown in FIG. 6C, the signal-to-noise ratio result of the signal received by the first receiving end after compensating for the dispersion compensation value corresponding to 60 km corresponds to the compensation of 80 km.
- the embodiment of the present application provides a dispersion compensation method and device to solve the fiber dispersion problem in an application scenario in which a transmitting end communicates with multiple receiving ends.
- the method and the device are based on the same inventive concept. Since the principles of the method and the device for solving the problem are similar, the implementation of the device and the method can be referred to each other, and the repeated description is not repeated.
- the signal-to-noise ratio is a parameter that describes the proportional relationship between the active component and the noise component in the signal.
- the conjugate signal refers to two signals with equal modulo values and opposite phases.
- System requirements refer to the system's preset performance requirements for the receiver.
- the performance requirements include transmission capacity, signal-to-noise ratio, transmission capacity range, signal-to-noise ratio range, and so on. If the preset transmission capacity is 28Gb/s, when the actual transmission capacity of the receiving end is greater than or equal to 28Gb/s, the receiving end satisfies the system requirements, and vice versa, the system requirements are not met; or, the preset signal-to-noise ratio is 13dB. When the signal-to-noise ratio of the signal received by the receiving end is greater than or equal to 13 dB, the receiving end satisfies the system requirement, and vice versa, the system requirement is not met.
- the preset transmission capacity ranges from [2, 4] Gb/s, when any two receivers When the difference of transmission capacity is within the range of [2, 4] Gb/s, the two receivers satisfy the system requirements, and vice versa, the system requirements are not met; or, the preset signal-to-noise ratio range [0, 1] dB, When the difference between the signal-to-noise ratios of the signals received by any two receiving ends is within the range of [0, 1] dB, then the two receiving ends satisfy the system requirements, and vice versa, the system requirements are not met, and so on.
- Multiple means two or more.
- a short-range optical communication system provided by an embodiment of the present application includes a transmitting end and a plurality of receiving ends. The communication distance between the sending end and the multiple receiving ends is different.
- the short-range optical communication system may be a communication system as shown in FIG. 1.
- the short-distance optical communication system includes two receiving ends, which are respectively a first receiving end and a second receiving end.
- FIG. 7 is a short-distance optical communication system provided by an embodiment of the present application.
- the schematic diagram shows that in the short-distance optical communication system, the transmitting end can include a signal generating module, a dispersion compensation module, a digital-to-analog converter (English: digital to analog converter, referred to as DAC), and DDMZM.
- the signal generation module or the dispersion compensation module may be implemented by one or more general-purpose processors, which may be central processing units (CPUs), or digital processing units, and the like.
- the signal generating module is configured to generate a time domain signal that is sent to the first receiving end and the second receiving end.
- the signal generating module may generate a time domain signal sent to the first receiving end and the second receiving end by:
- the signal generating module first generates a binary bit sequence and then converts the binary bit sequence into a frequency domain signal, wherein when converting the binary bit sequence into a frequency domain signal, the positive frequency and the negative of the frequency domain signal are guaranteed The frequency is a conjugate signal. Then, the signal generating module converts the frequency domain signal into a time domain signal by inverse Fourier transform, wherein the number of sampling points when the frequency domain signal passes the inverse Fourier transform may be 512 points. Finally, the signal generating module adds the converted time domain signal and the synchronization signal to obtain a time domain signal transmitted to the first receiving end and the second receiving end.
- the dispersion compensation module is configured to separately perform dispersion compensation on the time domain signal sent to the first receiving end and the time domain signal sent to the second receiving end.
- the DAC is used to convert the dispersion-compensated signal that has undergone the dispersion compensation module into an analog signal.
- FIG. 8A is a schematic structural diagram of a DDMZM according to an embodiment of the present application.
- the DDMZM includes two phase modulators (English: phase modulation, PM for short): upper arm PM and lower arm PM, each of which includes a radio frequency (English: radio frequency, abbreviated as: RF) port and a bias Set the port.
- the operating state of the DDMZM can be controlled by adjusting the voltage difference between the two bias ports included in the two PMs, for example, when the phase difference of the voltages of the two bias ports included in the two PMs is ⁇ /2, DDMZM In the best working condition.
- the DDMZM converts the electrical signal approximately linearly to the optical signal.
- the DDMZM also includes an optical input port and a light output port.
- the first receiving end and the second receiving end may each include a filter, a ROSA, an OSC, and a DSP module.
- the filter is used for filtering the noise of the out-of-band amplifier spontaneous emission noise (English: amplifier spontaneous emission noise, referred to as ASE) in the optical signal received by the receiving end.
- ASE amplifier spontaneous emission noise
- ROSA is used to convert an optical signal that filters out ASE noise into an electrical signal.
- the OSC is used to convert an electrical signal obtained by ROSA conversion into a digital signal.
- DSP for processing digital signals obtained by OSC conversion.
- the embodiment of the present application provides a dispersion compensation method.
- the dispersion compensation method can be applied to a dispersion compensation module at a transmitting end, and the dispersion compensation method may specifically include as follows:
- the sending end acquires a subcarrier allocation result, where the subcarrier allocation result includes a signal to noise ratio result based on a signal transmitted between the transmitting end and the at least two receiving ends, where the at least two receiving ends are Allocated subcarriers.
- the transmitting end performs dispersion compensation on the subcarriers allocated to the receiving ends corresponding to different communication distances according to the correspondence between the communication distance and the dispersion compensation value.
- the subcarrier allocation result is obtained by the sending end, where the subcarrier allocation result includes a signal to noise ratio result based on the transmitted signal between the transmitting end and the at least two receiving ends, and the result is at least two
- the subcarriers allocated by the receiving end are then subjected to dispersion compensation for the subcarriers allocated to the receiving ends corresponding to different communication distances according to the correspondence between the communication distance and the dispersion compensation value. Since the communication distance between the transmitting end and the different receiving end is different, the generated dispersion is different, and thus the required dispersion compensation value is different.
- the same dispersion value is compensated for different transmission distances.
- the chromatic dispersion value corresponding to the transmission distance is compensated for each transmission distance, which effectively mitigates the fading phenomenon caused by fiber dispersion in an application scenario in which a transmitting end communicates with multiple receiving ends, and helps to improve optical communication. System performance.
- the sending end obtains a subcarrier allocation result, which can be implemented as follows:
- the sending end sends a sounding signal to the two receiving ends on the plurality of subcarriers included in the preset carrier, and receives a determination based on the detection signal sent by each receiving end of the two receiving ends.
- the signal to noise ratio results.
- the signal to noise ratio result includes a signal to noise ratio value corresponding to each subcarrier in the preset carrier.
- the result of the signal-to-noise ratio of the first receiving end and the signal-to-noise ratio of the second receiving end wherein the communication distance between the transmitting end and the first receiving end is 40 km, and the transmitting end and the second receiving end are The communication distance between the two is 80km.
- the detection signal may be a quadrature phase shift keying (QPSK) or a binary phase shift keying (BPSK). It can also be an octal phase shift keying signal (8 phase shift keying, 8PSK for short), and other signals.
- QPSK quadrature phase shift keying
- BPSK binary phase shift keying
- 8PSK octal phase shift keying signal
- the sending end determines that the first signal to noise ratio value corresponding to the i th subcarrier in the preset carrier is the largest of the two signal to noise ratio values corresponding to the i th subcarrier;
- the signal to noise ratio result of the first signal to noise ratio value is sent by the first receiving end; the i is taken over a positive integer not greater than the number of subcarriers included in the preset carrier.
- the i-th subcarrier is then allocated to the first receiving end to determine a subcarrier allocated for the first receiving end. Based on the same method, the transmitting end determines the subcarrier allocated for the second receiving end.
- the sending end determines the method for the sub-carrier allocated by the third receiving end, and the method for determining the sub-carrier allocated by the transmitting end to the first receiving end,
- the application examples are not repeated here.
- the sub-carrier allocated by the transmitting end to be determined by the first receiving end and the sub-carrier allocated to the second receiving end may be implemented as follows:
- the transmitting end makes the reference signal to noise ratio SNR_Ref equal to the signal to noise ratio result SNR40 of the first receiving end.
- the sender compares the SNR value of each of the SNR80 and SNR_Ref subcarriers with respect to the signal to noise ratio of the second receiver.
- the transmitting end determines a subcarrier in which the SNR80 is greater than the SNR_Ref in the preset carrier, and allocates the subcarrier in the preset carrier with the SNR80 greater than the SNR_Ref to the second receiving end, and allocates the subcarrier in the preset carrier with the SNR80 less than or equal to the SNR_Ref
- the first receiving end determines the subcarrier allocated for the first receiving end, and determines the subcarrier allocated for the second receiving end.
- the SNR value of SNR80 is smaller than the SNR value of SNR_Ref (that is, SNR40), and thus the 19th to 47th subcarriers are used. Assigned to the first receiving end.
- the SNR value of SNR80 is greater than the SNR value of SNR_Ref, so the 47th to 67th subcarriers are allocated to the second receiving end.
- the subcarrier allocated to the first receiving end by the transmitting end and the subcarrier allocated by the transmitting end to the second receiving end are used.
- the corresponding frequency of the subcarriers is gradually increased from the 0th subcarrier to the 140th subcarrier, and the intervals of the center frequencies of any two adjacent subcarriers are equal.
- the transmitting end can also make SNR_Ref equal to the signal-to-noise ratio result SNR80 of the second receiving end, and compare SNR40 with SNR_Ref.
- the transmitting end determines the subcarrier in the preset carrier with the SNR 40 greater than the SNR_Ref, and allocates the subcarrier in the preset carrier with the SNR 40 greater than the SNR_Ref to the first receiving end, and allocates the subcarrier in the preset carrier with the SNR 40 less than or equal to the SNR_Ref to the first carrier.
- the second receiving end determines the subcarrier allocated for the first receiving end, and determines the subcarrier allocated for the second receiving end.
- the sending end obtains the subcarrier allocation result, and may also be implemented as follows:
- the sending end sends a sounding signal to the two receiving ends on the plurality of subcarriers included in the preset carrier, and receives, according to the detection signal, the sending signal sent by each receiving end of the two receiving ends.
- the signal to noise ratio results.
- the signal to noise ratio result includes a signal to noise ratio value corresponding to each subcarrier in the preset carrier. Go to step C2.
- the detection signal may be QPSK, BPSK, or 8PSK, and may be other signals.
- the embodiment of the present application is not limited herein.
- the sending end determines that the first signal to noise ratio value corresponding to the jth subcarrier in the preset carrier is the largest of the two signal to noise ratio values corresponding to the jth subcarrier. If the signal to noise ratio result including the first signal to noise ratio value is sent by the first receiving end, assigning the jth subcarrier to the first receiving end, if the first signal to noise is included The signal to noise ratio result of the ratio is sent by the second receiving end, and the jth subcarrier is allocated to the second receiving end. Thereby determining the subcarriers allocated for the first receiving end and determining the subcarriers allocated for the second receiving end. Go to step C3.
- the transmitting end determines a sum of signal to noise ratio values corresponding to respective subcarriers allocated to the first receiving end, and a sum of signal to noise ratio values corresponding to the respective subcarriers allocated to the second receiving end. Perform step C4
- the difference between the sum value corresponding to the subcarrier allocated to the second receiving end and the sum value corresponding to the subcarrier allocated to the first receiving end exceeds a preset signal to noise ratio range. And adjusting a subcarrier allocated to the first receiving end and a subcarrier allocated to the second receiving end, so that a sum value corresponding to the subcarrier allocated to the second receiving end is the first receiving.
- the difference between the sum values corresponding to the subcarriers allocated by the terminal is within a preset signal to noise ratio range.
- the difference between the sum value corresponding to the subcarrier allocated to the second receiving end and the subcarrier corresponding to the first receiving end is not exceeded by the sending end.
- the subcarriers allocated to the second receiving end and the subcarriers allocated to the first receiving end are no longer adjusted.
- the transmitting end determines the sub-load allocated to the third receiving end.
- the method for determining the sub-carrier allocated by the first receiving end by the transmitting end may be specifically referred to in the step C1 to the step C4, and details are not repeatedly described herein.
- the sending end obtains the subcarrier allocation result, and may also be implemented as follows:
- the transmitting end determines a modulation format corresponding to each subcarrier according to the subcarrier allocated for the first receiving end and the subcarrier allocated for the second receiving end, and determines the transmission of the first receiving end according to the modulation format corresponding to each subcarrier.
- the capacity and the transmission capacity of the second receiving end if it is determined that the transmission capacity of the first receiving end or the transmission capacity of the second receiving end does not satisfy the system requirement, step D4 is performed.
- the transmitting end determines, according to a signal to noise ratio corresponding to the mth subcarrier in the signal to noise ratio result of the first receiving end, a modulation format corresponding to the mth subcarrier, where the mth subcarrier is allocated by the transmitting end to the first receiving end. Any one of the subcarriers, so that the transmitting end determines the modulation format corresponding to each of the subcarriers allocated by the first receiving end, and then determines the first receiving end according to the modulation format of each subcarrier allocated for the first receiving end.
- Transmission capacity For the manner of determining the transmission capacity according to the modulation format, refer to the determination scheme provided by the prior art, which is not repeatedly described in the embodiment of the present application.
- the 19th to 47th subcarriers and the 67th to 95th subcarriers are allocated to the first receiving end, and then the 19th subunit is determined according to the signal to noise ratio value corresponding to the 19th subcarrier.
- a modulation format corresponding to the carrier and determining a modulation format corresponding to each of the 20th to 47th subcarriers and the 67th to 95th subcarriers based on the same method, according to the determined 19th to 47th subcarriers, 67th to 95th
- the modulation format corresponding to each of the subcarriers determines the transmission capacity of the first receiving end.
- step D4 the transmitting end adjusts the subcarrier allocated to the first receiving end and the subcarrier allocated to the second receiving end according to system requirements, so that the adjusted transmission capacity of the first receiving end satisfies the system requirement and the adjusted transmission capacity of the second receiving end Meet system requirements.
- step D5 is performed after step D4 is performed.
- the transmitting end determines that the adjusted difference between the transmission capacity of the first receiving end and the adjusted transmission capacity of the second receiving end exceeds the preset transmission capacity range, and adjusts to the subcarrier allocated by the first receiving end and is the second
- the subcarriers allocated by the receiving end are such that the difference between the adjusted transmission capacity of the first receiving end and the adjusted transmission capacity of the second receiving end is within a preset transmission capacity range.
- the transmitting end does not adjust to the second receiving end when determining that the difference between the adjusted transmission capacity of the first receiving end and the adjusted transmission capacity of the second receiving end is within a preset transmission capacity range.
- the transmitting end determines the method for the sub-carrier allocated by the third receiving end. For details, refer to step D1 to step D5, where the transmitting end determines that the first receiving end is allocated. The method of subcarriers is not repeated here.
- the transmitting end allocates the subcarrier allocated to the first receiving end and the subcarrier allocated to the second receiving end according to the preset signal to noise ratio range, so that the sum value corresponding to the subcarrier of the first receiving end is The sum value corresponding to the subcarriers of the second receiving end meets the system requirements, and the subcarriers allocated to the first receiving end and the subcarriers allocated to the second receiving end are adjusted so that the subcarriers allocated to the first receiving end The difference between the corresponding sum value and the sum value corresponding to the subcarrier allocated for the second receiving end is within a preset signal to noise ratio range.
- the sum of the signal to noise ratios of the assigned subcarriers is proportional to the transmission capacity determined by the subcarriers allocated for the first receiving end.
- the preset signal to noise ratio range is determined based on the preset transmission capacity range, or the preset transmission capacity range is determined based on the preset signal to noise ratio range. Therefore, the difference between the transmission capacity of the first receiving end and the transmission capacity of the second receiving end is within a preset transmission capacity range; since the signal to noise ratio is inversely proportional to the error rate, the error of the electrical signal after the first receiving end is converted. The difference between the rate and the error rate of the electrical signal converted by the second receiving end is within a preset error rate range.
- the subcarriers are allocated to each receiving end according to the SNR corresponding to each subcarrier transmitted by the different receiving end, according to the preset signal to noise ratio.
- the range or preset transmission capacity range is adjusted to the subcarriers allocated to each receiver, which can improve system performance, such as transmission capacity.
- the transmitting end may perform Fourier transform on the time domain signal generated by the signal generating module. Afterwards, the transmitting end maps the Fourier-transformed frequency domain signal to the dispersion-compensated subcarrier allocated to the first receiving end, and then performs inverse Fourier transform on the mapped signal. Send to the first receiver. And transforming the Fourier-transformed frequency domain signal onto the dispersion-dispensed subcarrier allocated to the second receiving end, and then performing inverse Fourier transform on the mapped signal and transmitting to the second receiving end.
- the short-distance optical communication system further includes a third receiving end
- the transmitting end maps the Fourier-transformed frequency domain signal to the transmitting end.
- the dispersion-compensated subcarriers allocated to the third receiving end are then subjected to inverse Fourier transform for the mapped signals and then sent to the third receiving end.
- the transmitting end may also perform the dispersion compensation on the subcarriers allocated to the receiving end corresponding to different communication distances according to the correspondence relationship between the communication distance and the dispersion compensation value (that is, the transmitting end is for the child allocated to the first receiving end.
- the time domain signal generated by the signal generation module is subjected to Fourier transform before the carrier and the subcarriers allocated to the second receiving end are respectively subjected to dispersion compensation.
- the Fourier transformed signal transmitted to the first receiving end is then mapped onto the subcarriers allocated for the first receiving end. Then, the signal after mapping the subcarriers is compensated for the dispersion compensation value corresponding to the communication distance between the first receiving end and the transmitting end (corresponding to the compensation between the first receiving end and the transmitting end for the subcarrier allocated to the first receiving end) The dispersion compensation value corresponding to the communication distance). Finally, the compensated signal is subjected to inverse Fourier transform and then sent to the first receiving end.
- the dispersion compensation value corresponding to the communication distance between the second receiving end and the transmitting end is compensated (corresponding to the compensation between the second receiving end and the transmitting end for the subcarrier allocated to the second receiving end) The dispersion compensation value corresponding to the communication distance).
- the compensated signal is subjected to inverse Fourier transform and then sent to the second receiving end.
- the following takes the first receiving end as an example, and specifically describes a process in which the transmitting end sends the signal after the inverse Fourier transform to the first receiving end.
- the process in which the transmitting end sends the signal after the inverse Fourier transform to the second receiving end is the same as the process in which the transmitting end sends the signal after the inverse Fourier transform to the first receiving end, so The process of transmitting the signal after the inverse Fourier transform to the second receiving end is performed by the transmitting end, and the process of transmitting the signal after the inverse Fourier transform to the first receiving end by the transmitting end, the embodiment of the present application is no longer here. Repeat the details.
- the sending end sends the signal after the inverse Fourier transform to the first receiving end, which can be adopted as follows achieve:
- the transmitting end loads a cyclic prefix (English: cyclic prefix, referred to as CP) on the signal after the inverse Fourier transform.
- a cyclic prefix English: cyclic prefix, referred to as CP
- the embodiment of the present application helps to improve the anti-dispersion performance of the short-distance optical communication system by loading the cyclic prefix on the signal after the inverse Fourier transform.
- the transmitting end converts the signal loaded with the CP into an analog signal through the DAC, and determines the real part I of the analog signal and the imaginary part Q of the analog signal.
- the transmitting end processes the real part I of the analog signal through the electric domain driver and the attenuator respectively, and processes the imaginary part Q of the analog signal through the electric domain driver and the attenuator respectively.
- the transmitting end outputs the processed real part I of the analog signal and the processed imaginary part Q of the analog signal to the DDMZM shown in FIG. 7, respectively, thereby converting the analog signal into an optical signal, and then converting the converted signal.
- the optical signal is sent to the first receiving end.
- the transmitting end can input the processed real part I of the analog signal to the RF port of the upper arm PM of the DDMZM, and input the processed imaginary part Q to the RF port of the lower arm PM of the DDMZM, thereby driving the DDMZM.
- the two PMs work.
- the optical input port of the DDMZM receives a continuous light (English: continuous wave, referred to as CW), and the two PMs of the DDMZM convert the received continuous light into the analog signal under the driving of the analog signal. Light signal.
- the transmitting end sends the signal after the inverse Fourier transform to the third receiving end, and specifically, the transmitting end will undergo the inverse Fourier transform.
- the process of sending the signal to the first receiving end is not repeated here.
- the process of processing the received optical signal by the first receiving end by taking the first receiving end is the same as the process of processing the received optical signal by the second receiving end, so the second receiving end performs the received optical signal.
- the process of processing refer to the process of processing the received optical signal by the first receiving end, and details are not repeatedly described herein.
- the first receiving end processes the received optical signal, which can be implemented as follows:
- the first receiving end After receiving the optical signal, the first receiving end filters the received optical signal through the filter to filter out the ASE noise.
- the first receiving end converts the optical signal filtering the ASE noise into an electrical signal through the ROSA.
- the first receiving end converts the converted electrical signal into a digital signal through the OSC.
- the first receiving end processes the converted digital signal through the digital DSP.
- the short-distance optical communication system further includes a third receiving end
- the third receiving end processes the received optical signal, and specifically, the process of processing the received optical signal by the first receiving end,
- the embodiments of the present application are not repeated here.
- the subcarrier allocation result is obtained by the sending end, where the subcarrier allocation result includes a signal to noise ratio result based on the transmitted signal between the transmitting end and the at least two receiving ends, and the result is at least two
- the subcarriers allocated by the receiving end are then subjected to dispersion compensation for the subcarriers allocated to the receiving ends corresponding to different communication distances according to the correspondence between the communication distance and the dispersion compensation value. Since the communication distance between the transmitting end and the different receiving end is different, the generated dispersion is different, and thus the required dispersion compensation value is different.
- the same dispersion value is compensated for different transmission distances.
- the chromatic dispersion value corresponding to the transmission distance is compensated for each transmission distance, which effectively alleviates the fading caused by fiber dispersion in an application scenario in which a transmitting end communicates with multiple receiving ends. Falling phenomenon helps to improve the performance of optical communication systems.
- each receiving The subcarriers allocated by the terminal are such that the sum values corresponding to the subcarriers allocated by each receiver satisfy the system requirements.
- the system capacity (that is, the sum of the transmission capacities of the receiving ends in the system) is solved by the dispersion compensation method provided by the existing scheme 1 and the existing scheme 2 and the embodiment of the present application.
- Comparison chart wherein, when the transmitting end solves the fiber dispersion problem through the existing solution 1, the system capacity reached by the transmitting end is 44 Gb/s; when the transmitting end solves the fiber dispersion problem through the existing solution 2, the system capacity reached by the transmitting end is 47 Gb/s; When the transmitting end solves the fiber dispersion problem by using the dispersion compensation method provided by the embodiment of the present application, the system capacity reached by the transmitting end is 60 Gb/s. It can be seen that the dispersion compensation method provided by the embodiment of the present application improves the system capacity to a certain extent, thereby improving system performance.
- the bit error rate-signal-to-noise ratio curve corresponding to the receiving end after dispersion compensation by the dispersion compensation method provided by the embodiment of the present application is performed after the dispersion compensation is performed by the prior art point-to-point dispersion compensation method.
- the “56Gb/s 80km” curve is the error code after the dispersion compensation of the receiving end with the communication distance of 80km by using the point-to-point dispersion compensation method in the prior art with the system capacity of 56Gb/s.
- Rate-signal-to-noise ratio curve; the “56Gb/s40km” curve is the error after dispersion compensation for the receiver with a communication distance of 40km using the point-to-point dispersion compensation method in the prior art with a system capacity of 56Gb/s.
- the rate-signal-to-noise ratio curve; the "28Gb/s 80km” curve and the "28Gb/s 40km” curve are respectively used in the case where the system capacity is 56Gb/s, and the dispersion compensation method provided by the embodiment of the present application is used for the communication distance.
- bit error rate-signal-to-noise ratio curve after dispersion compensation is performed at the receiving end of 80 km, and the bit error rate-signal-to-noise ratio curve after dispersion compensation is performed on the receiving end with a communication distance of 40 km. It can be seen from FIG. 13 that, when the signal-to-noise ratio is the same, the error rate after the dispersion compensation by the point-to-point dispersion compensation method in the prior art is greater than the dispersion compensation method provided by the embodiment of the present application.
- the bit error rate as shown in Figure 13, the "56Gb/s 80km” curve has a signal-to-noise ratio of 23 corresponding to the bit error rate and the "56Gb/s 40km” curve has a signal-to-noise ratio of 23 corresponding to the bit error rate.
- the rate is higher than the error rate corresponding to the signal-to-noise ratio of 23 in the "28Gb/s 40km” curve and the error rate corresponding to the signal-to-noise ratio of 23 in the "28Gb/s 80km” curve. Therefore, the present application implements The dispersion compensation method provided by the example reduces the bit error rate and improves the system performance compared to the conventional point-to-point dispersion compensation method.
- the embodiment of the present invention provides a dispersion compensation device, which can be applied to a dispersion compensation module at a transmitting end, or can be used as a dispersion compensation device when the dispersion compensation device is implemented in software.
- Dispersion compensation module at the transmitting end communicates with the at least two receiving ends, and the communication distance between the sending end and the at least two receiving ends is different, specifically for implementing the method described in the embodiments described in FIG. 1 to FIG.
- the structure of the device is as shown in FIG. 14, and includes a distribution unit 1401 and a compensation unit 1402, wherein:
- the allocating unit 1401 is configured to obtain a subcarrier allocation result, where the subcarrier allocation result includes a signal to noise ratio result based on a signal transmitted between the transmitting end and the at least two receiving ends, where the at least two receiving ends are Allocated subcarriers.
- the compensation unit 1402 is configured to perform dispersion compensation on the subcarriers allocated to the receiving end corresponding to different communication distances included in the subcarrier allocation result acquired by the allocating unit 1401 according to the correspondence between the communication distance and the dispersion compensation value.
- the allocating unit 1401 is configured to receive a signal to noise ratio result of a signal transmitted between each of the receiving ends and the sending end sent by each receiving end of the at least two receiving ends, and And assigning a subcarrier to the at least two receiving ends based on a signal to noise ratio result respectively sent by the at least two receiving ends.
- the allocating unit 1401 is configured to send a sounding signal to the at least two receiving ends on the plurality of subcarriers included in the preset carrier, and receive each of the at least two receiving ends. And a signal to noise ratio result determined based on the sounding signal; the signal to noise ratio result includes a signal to noise ratio value corresponding to each of the preset carriers.
- the first signal to noise ratio value corresponding to the i th subcarrier in the preset carrier is the largest one of the plurality of signal to noise ratio values corresponding to the i th subcarrier; wherein the first signal to noise ratio is included
- the signal to noise ratio result of the value is sent by the first receiving end; the i is taken over a positive integer not greater than the number of subcarriers included in the preset carrier.
- the ith subcarrier is then allocated to the first receiving end, and the first receiving end is any one of at least two receiving ends.
- the allocating unit 1401 is configured to send a sounding signal to the at least two receiving ends on the plurality of subcarriers included in the preset carrier, and receive each of the at least two receiving ends. And a signal to noise ratio result determined based on the sounding signal; the signal to noise ratio result includes a signal to noise ratio value corresponding to each of the preset carriers.
- the second signal-to-noise ratio value corresponding to the j-th sub-carrier determines, by the second signal-to-noise ratio value corresponding to the j-th sub-carrier, the second signal-to-noise ratio corresponding to the j-th sub-carrier; wherein the second signal-to-noise ratio is included
- the signal-to-noise ratio result of the value is sent by the second receiving end; the j takes a positive integer not greater than the number of subcarriers included in the preset carrier, and allocates the jth subcarrier to the first Two receiving ends.
- the second receiving end and the third receiving end are any two of the at least two receiving ends.
- the apparatus may further include a Fourier transform unit 1403 and an inverse Fourier transform unit 1404.
- the Fourier transform unit 1403 is configured to: after the compensation unit 1402 performs dispersion compensation on the subcarriers allocated to the receiving end corresponding to different communication distances according to the correspondence between the communication distance and the dispersion compensation value, respectively A signal of each of the at least two receiving ends is subjected to Fourier transform.
- the compensating unit 1402 is further configured to map, by using the Fourier transform unit 1403, the signal that is sent to the fourth receiving end to the sub-carrier that is allocated to the fourth receiving end and is subjected to dispersion compensation.
- the fourth receiving end is any one of the at least two receiving ends.
- the inverse Fourier transform unit 1404 is configured to perform inverse Fourier transform on the signal after the mapping by the compensation unit 1402, and then send the signal to the fourth receiving end.
- the Fourier transform unit 1403 is configured to send, respectively, the compensation unit 1402 according to the correspondence between the communication distance and the dispersion compensation value, before performing dispersion compensation on the subcarriers allocated to the receiving end corresponding to different communication distances.
- the allocating unit 1401 is further configured to map the signal transformed by the Fourier transform unit 1403 to the fourth receiving end To the subcarrier allocated for the fourth receiving end, the fourth receiving end is any one of the at least two receiving ends;
- the compensating unit 1402 is in accordance with the correspondence between the communication distance and the dispersion compensation value And performing the chromatic dispersion compensation on the subcarriers that are allocated to the receiving end corresponding to the different communication distances, and the specificity is used for the allocation according to the correspondence between the communication distance and the dispersion compensation value.
- the unit 1401 maps the signals after the subcarriers to perform dispersion compensation; the inverse Fourier transform unit 1404 is configured to The signal compensation element 140
- each functional module in each embodiment of the present application may be integrated into one processing.
- Device In addition, it may be physically present alone, or two or more modules may be integrated into one module.
- the above integrated modules can be implemented in the form of hardware or in the form of software functional modules.
- the processor 1501, the memory 1502, and the communication interface 1503 can be included.
- the physical hardware corresponding to the allocation unit 1401, the compensation unit 1402, the Fourier transform unit 1403, and the inverse Fourier transform unit 1404 may be the processor 1501.
- the processor 1501 can be a central processing unit (English: central processing unit, CPU for short), or a digital processing unit or the like.
- the processor 1501 transmits and receives data through the communication interface 1503.
- the memory 1502 is configured to store a program executed by the processor 1501.
- connection medium between the processor 1501, the memory 1502, and the communication interface 1503 is not limited in the embodiment of the present application.
- the memory 1502, the processor 1501, and the communication interface 1503 are connected by a bus 1504 in FIG. 15, and the bus is indicated by a thick line in FIG. 15, and the connection manner between other components is only schematically illustrated. , not limited to.
- the bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 15, but it does not mean that there is only one bus or one type of bus.
- the memory 1502 may be a volatile memory (English: volatile memory), such as a random access memory (English: random-access memory, abbreviation: RAM); the memory 1502 may also be a non-volatile memory (English: non-volatile memory) For example, read-only memory (English: read-only memory, abbreviation: ROM), flash memory (English: flash memory), hard disk (English: hard disk drive, abbreviation: HDD) or solid state drive (English: solid-state drive Abbreviation: SSD), or memory 1502 is any other medium that can be used to carry or store desired program code in the form of an instruction or data structure and that can be accessed by a computer, but is not limited thereto.
- the memory 1502 may be a combination of the above memories.
- the processor 1501 is configured to execute the program code stored in the memory 1502, and is specifically configured to perform the method described in the foregoing embodiments of the present invention, and may be implemented by referring to the corresponding embodiments in FIG. 1 to FIG. Narration.
- the subcarrier allocation result is obtained by the sending end, where the subcarrier allocation result includes a signal to noise ratio result based on the transmitted signal between the transmitting end and the at least two receiving ends, and the result is at least two
- the subcarriers allocated by the receiving end are then subjected to dispersion compensation for the subcarriers allocated to the receiving ends corresponding to different communication distances according to the correspondence between the communication distance and the dispersion compensation value. Since the communication distance between the transmitting end and the different receiving end is different, the generated dispersion is different, and thus the required dispersion compensation value is different.
- the same dispersion value is compensated for different transmission distances.
- the chromatic dispersion value corresponding to the transmission distance is compensated for each transmission distance, which effectively alleviates the fading phenomenon caused by fiber dispersion in an application scenario in which a transmitting end communicates with multiple receiving ends, and improves to a certain extent.
- the system capacity reduces the bit error rate and helps to improve the performance of the optical communication system.
- each receiving The subcarriers allocated by the terminal are such that the signal to noise ratio and the value corresponding to the subcarriers allocated by each receiver satisfy the system requirements.
- embodiments of the present application can be provided as a method, system, or computer program product.
- the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment in combination of software and hardware.
- the application can employ a meter implemented on one or more computer usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer usable program code embodied therein.
- the form of the computer program product includes but not limited to disk storage, CD-ROM, optical storage, etc.
- the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
- the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
- These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
- the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.
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Abstract
A dispersion compensation method and apparatus, for use in resolving the optical fiber dispersion problem in an application scenario of communication between one sending side and multiple receiving sides. The method specifically comprises: a sending side obtains a subcarrier allocation result, the subcarrier allocation result comprising subcarriers allocated to at least two receiving sides according to a signal-to-noise ratio result of transmission signals between the sending side and the at least two receiving sides; and the sending side performs dispersion compensation on subcarriers allocated to the receiving sides corresponding to different communication distances according to a correspondence between communication distances and dispersion compensation values.
Description
本申请涉及光纤通信技术领域,特别涉及一种色散补偿方法及装置。The present application relates to the field of optical fiber communication technologies, and in particular, to a dispersion compensation method and apparatus.
随着移动互联网应用(如高清视频,3D直播,虚拟现实等)的迅猛发展,对短距离光通信的系统性能要求越来越高。对于短距离光通信而言,器件成本和功耗是系统性能的主要考虑因素。目前,在短距离光通信中,应用更多的是直接检测技术。直接检测技术是利用光强度携带信息传输至接收端,从而接收端在接收到光信号后,将光信号转换为电信号。With the rapid development of mobile Internet applications (such as high-definition video, 3D live broadcast, virtual reality, etc.), the system performance requirements for short-distance optical communication are getting higher and higher. For short-range optical communications, device cost and power consumption are major considerations for system performance. At present, in short-distance optical communication, more applications are direct detection techniques. The direct detection technology uses the light intensity carrying information to transmit to the receiving end, so that the receiving end converts the optical signal into an electrical signal after receiving the optical signal.
在短距离光通信中应用直接检测技术时,必须要考虑到光纤色散的问题,即发送端发送的光信号经过光纤传输后到达接收端,光纤传输产生的色散会导致接收端转换后的电信号产生功率衰落。目前常用的解决光纤色散的方法主要是针对一个发送端与一个接收端进行通信的应用场景,发送端针对电信号补偿一个预配置的色散补偿值,然后将经过补偿后的电信号转换成光信号发送给接收端,从而解决光纤色散的问题。但是在一个发送端与多个接收端进行通信的应用场景中而目前并没有一个很好的解决方案。When applying direct detection technology in short-distance optical communication, the problem of fiber dispersion must be considered. That is, the optical signal transmitted by the transmitting end is transmitted to the receiving end after being transmitted through the optical fiber, and the dispersion generated by the optical fiber transmission causes the electrical signal after the conversion of the receiving end. Power fading occurs. At present, the commonly used method for solving fiber dispersion is mainly for an application scenario in which a transmitting end communicates with a receiving end, and the transmitting end compensates a pre-configured dispersion compensation value for the electrical signal, and then converts the compensated electrical signal into an optical signal. Send to the receiving end to solve the problem of fiber dispersion. However, there is currently no good solution in an application scenario where one sender communicates with multiple receivers.
发明内容Summary of the invention
本申请实施例提供了一种色散补偿方法及装置,以解决一个发送端与多个接收端进行通信的应用场景中的光纤色散问题。The embodiment of the present application provides a dispersion compensation method and device to solve the fiber dispersion problem in an application scenario in which a transmitting end communicates with multiple receiving ends.
第一方面,本申请实施例提供了一种色散补偿方法,所述方法可以应用于发送端,所述发送端与至少两个接收端进行通信,且所述发送端与所述至少两个接收端之间的通信距离不同,所述方法包括:所述发送端获取子载波分配结果,所述子载波分配结果中包括基于所述发送端与所述至少两个接收端之间传输信号的信噪比结果为所述至少两个接收端分配的子载波。然后所述发送端根据通信距离与色散补偿值的对应关系,针对分配给不同通信距离对应的接收端的子载波进行色散补偿。In a first aspect, the embodiment of the present application provides a dispersion compensation method, where the method can be applied to a transmitting end, the transmitting end communicates with at least two receiving ends, and the transmitting end and the at least two receiving ends The communication distance between the terminals is different, the method includes: the sending end acquires a subcarrier allocation result, where the subcarrier allocation result includes a signal that is based on a signal transmitted between the sending end and the at least two receiving ends The noise ratio result is a subcarrier allocated by the at least two receiving ends. Then, the transmitting end performs dispersion compensation on the subcarriers allocated to the receiving end corresponding to different communication distances according to the correspondence between the communication distance and the dispersion compensation value.
上述方案提供了一种针对一个发送端与多个接收端进行通信的应用场景的光纤色散解决方案,由于发送端与不同的接收端之间的通信距离不同,因此产生的色散不同,从而需要的色散补偿值不同,相比于现有技术中色散补偿方法对于不同的传输距离补偿相同的色散值,本申请实施例中针对每一个传输距离补偿该传输距离对应的色散值,有效的缓解了一个发送端与多个接收端进行通信的应用场景中光纤色散导致的衰落现象,有助于提高光通信系统的性能。The foregoing solution provides a fiber dispersion solution for an application scenario in which a transmitting end communicates with multiple receiving ends. Since the communication distance between the transmitting end and the different receiving end is different, the generated dispersion is different, thereby requiring The dispersion compensation value is different. Compared with the dispersion compensation method in the prior art, the same dispersion value is compensated for different transmission distances. In the embodiment of the present application, the dispersion value corresponding to the transmission distance is compensated for each transmission distance, which effectively alleviates one. The fading phenomenon caused by fiber dispersion in the application scenario where the transmitting end communicates with multiple receiving ends helps to improve the performance of the optical communication system.
在一种可能的设计中,所述发送端获取子载波分配结果时,可以通过如下方式实现:所述发送端在预设载波包括的多个子载波上分别向所述至少两个接收端发送探测信号,并接收所述至少两个接收端中每个接收端发来的基于所述探测信号确定的信噪比结果;所述信噪比结果中包括所述预设载波中每个子载波对应的信噪比值。然后所述发送端确定所述预设载波中的第i个子载波对应的第一信噪比值是所述第i个子载波对应的多个信噪比值中最大的;其中,包括所述第一信噪比值的信噪比结果是由第一接收端发来的;所述i取
遍不大于所述预设载波包括的子载波数量的正整数。之后所述发送端将所述第i个子载波分配给所述第一接收端,所述第一接收端为至少两个接收端中的任意一个。In a possible design, when the sending end obtains the subcarrier allocation result, the sending end may be implemented by: sending, by the sending end, the detecting to the at least two receiving ends respectively on the multiple subcarriers included in the preset carrier a signal, and receiving a signal to noise ratio result determined by the detection signal sent by each of the at least two receiving ends; the signal to noise ratio result includes a corresponding one of each of the preset carriers Signal to noise ratio value. And the transmitting end determines that the first signal to noise ratio value corresponding to the i th subcarrier in the preset carrier is the largest one of the plurality of signal to noise ratio values corresponding to the i th subcarrier; The signal to noise ratio result of a signal to noise ratio value is sent by the first receiving end;
The number is not greater than a positive integer of the number of subcarriers included in the preset carrier. The transmitting end then allocates the ith subcarrier to the first receiving end, and the first receiving end is any one of at least two receiving ends.
上述设计中,发送端可以保证经过分配后每个子载波所对应的信噪比值是该子载波对应的多个信噪比值中最大的,从而有助于提高系统性能。In the above design, the transmitting end can ensure that the signal-to-noise ratio corresponding to each sub-carrier after being allocated is the largest among the multiple SNR values corresponding to the sub-carrier, thereby contributing to improving system performance.
在一种可能的设计中,所述发送端获取子载波分配结果,还可以通过如下方式实现:所述发送端在预设载波包括的多个子载波上分别向所述至少两个接收端发送探测信号,并接收所述至少两个接收端中每个接收端发来的基于所述探测信号确定的信噪比结果;所述信噪比结果中包括所述预设载波中每个子载波对应的信噪比值。然后所述发送端确定所述预设载波中的第j个子载波对应的第二信噪比值是所述第j个子载波对应的多个信噪比值中最大的;其中,包括所述第二信噪比值的信噪比结果是由第二接收端发来的;所述j取遍不大于所述预设载波包括的子载波数量的正整数。并将所述第j个子载波分配给所述第二接收端。之后,所述发送端确定为所述第二接收端分配的各个子载波分别对应的信噪比值的和值,以及确定为第三接收端分配的各个子载波分别对应的信噪比值的和值,所述第二接收端与所述第三接收端为所述至少两个接收端中的任意两个接收端。最后,所述发送端在确定为所述第二接收端分配的子载波对应的和值与为所述第三接收端分配的子载波对应的和值之间的差超出预设范围时,调整为所述第二接收端分配的子载波以及为所述第三接收端分配的子载波,使得为所述第二接收端分配的子载波对应的和值与为所述第三接收端分配的子载波对应的和值之间的差在预设范围内。In a possible design, the sending end obtains the subcarrier allocation result, and may be implemented by: sending, by the sending end, the detecting to the at least two receiving ends respectively on the multiple subcarriers included in the preset carrier a signal, and receiving a signal to noise ratio result determined by the detection signal sent by each of the at least two receiving ends; the signal to noise ratio result includes a corresponding one of each of the preset carriers Signal to noise ratio value. The transmitting end determines that the second signal to noise ratio value corresponding to the jth subcarrier in the preset carrier is the largest of the plurality of signal to noise ratio values corresponding to the jth subcarrier; The signal to noise ratio result of the second signal to noise ratio is sent by the second receiving end; the j is taken over a positive integer not greater than the number of subcarriers included in the preset carrier. And assigning the jth subcarrier to the second receiving end. Afterwards, the transmitting end determines a sum of signal to noise ratio values corresponding to the respective subcarriers allocated to the second receiving end, and determines a signal to noise ratio value corresponding to each subcarrier allocated to the third receiving end. And a value, the second receiving end and the third receiving end are any two of the at least two receiving ends. Finally, the transmitting end adjusts when the difference between the sum value corresponding to the subcarrier allocated to the second receiving end and the sum value corresponding to the subcarrier allocated to the third receiving end exceeds a preset range a subcarrier allocated to the second receiving end and a subcarrier allocated to the third receiving end, such that a sum value corresponding to the subcarrier allocated to the second receiving end is allocated to the third receiving end The difference between the sum values corresponding to the subcarriers is within a preset range.
可选地,所述发送端在确定为所述第二接收端分配的子载波对应的和值与为所述第三接收端分配的子载波对应的和值之间的差未超出预设信噪比范围时,不再调整为所述第二接收端分配的子载波以及为第三接收端分配的子载波。Optionally, the difference between the sum value corresponding to the subcarrier allocated to the second receiving end and the subcarrier corresponding to the third receiving end is not exceeded by the sending end. In the noise ratio range, the subcarriers allocated to the second receiving end and the subcarriers allocated to the third receiving end are no longer adjusted.
上述设计中,发送端可以保证为所述第二接收端分配的子载波对应的和值与为所述第三接收端分配的子载波对应的和值之间的差在预设信噪比范围内,由于信噪比值与误码率存在反比例关系,从而使得第二接收端的误码率与第三接收端的误码率之间的差在预设误码率范围内,进行有助于提升系统性能。In the above design, the transmitting end may ensure that the difference between the sum value corresponding to the subcarrier allocated to the second receiving end and the sum value corresponding to the subcarrier allocated to the third receiving end is in a preset signal to noise ratio range. Therefore, since the signal-to-noise ratio value is inversely proportional to the error rate, the difference between the error rate of the second receiving end and the error rate of the third receiving end is within a preset error rate range, which is helpful for improvement. System performance.
可选的,所述发送端获取子载波分配结果,还可以通过如下方式实现:所述发送端在预设载波包括的多个子载波上分别向所述至少两个接收端发送探测信号,并接收所述至少两个接收端中每个接收端发来的基于所述探测信号确定的信噪比结果;所述信噪比结果中包括所述预设载波中每个子载波对应的信噪比值。然后所述发送端确定所述预设载波中的第j个子载波对应的第二信噪比值是所述第j个子载波对应的多个信噪比值中最大的;其中,包括所述第二信噪比值的信噪比结果是由第二接收端发来的;所述j取遍不大于所述预设载波包括的子载波数量的正整数。所述发送端将所述第j个子载波分配给所述第二接收端。之后,所述发送端根据为第二接收端分配的子载波以及为第三接收端分配的子载波确定每个子载波对应的调制格式,并根据每个子载波对应的调制格式确定第二接收端的传输容量以及第三接收端的传输容量,确定第二接收端的传输容量或者第三接收端的传输容量是否满足系统需求。若确定第二接收端的传输容量或者第三接收端的传输容量不满足系统需求,发送端根据系统需求调整分配给第二接收端的子载波以及分配给第三接收端的子载波,使得经过调整后第二接收端的传输容量满足系统需求,以及经过调整后第三接收端的传输容量满足系统需求。发送端在确定经过调整后第一接收端的传输容量与经过调整后第二接收端的传输容量均满足系统需求时,不再调整为所述第二接收端分配的子载波以及
为第一接收端分配的子载波。Optionally, the obtaining, by the sending end, the subcarrier allocation result may be implemented by: sending, by the sending end, the detecting signals to the at least two receiving ends on the multiple subcarriers included in the preset carrier, and receiving a signal to noise ratio result determined by the detection signal sent by each of the at least two receiving ends; the signal to noise ratio result includes a signal to noise ratio value corresponding to each subcarrier in the preset carrier . The transmitting end determines that the second signal to noise ratio value corresponding to the jth subcarrier in the preset carrier is the largest of the plurality of signal to noise ratio values corresponding to the jth subcarrier; The signal to noise ratio result of the second signal to noise ratio is sent by the second receiving end; the j is taken over a positive integer not greater than the number of subcarriers included in the preset carrier. The transmitting end allocates the jth subcarrier to the second receiving end. Afterwards, the transmitting end determines a modulation format corresponding to each subcarrier according to the subcarrier allocated for the second receiving end and the subcarrier allocated for the third receiving end, and determines the transmission of the second receiving end according to the modulation format corresponding to each subcarrier. The capacity and the transmission capacity of the third receiving end determine whether the transmission capacity of the second receiving end or the transmission capacity of the third receiving end meets the system requirement. If it is determined that the transmission capacity of the second receiving end or the transmission capacity of the third receiving end does not meet the system requirement, the transmitting end adjusts the subcarrier allocated to the second receiving end and the subcarrier allocated to the third receiving end according to the system requirement, so that the adjusted second The transmission capacity of the receiving end meets the system requirements, and the adjusted transmission capacity of the third receiving end meets the system requirements. After determining that the adjusted transmission capacity of the first receiving end and the adjusted transmission capacity of the second receiving end satisfy the system requirements, the transmitting end does not adjust the subcarrier allocated to the second receiving end and
The subcarrier allocated for the first receiving end.
可选的,在确定第二接收端的传输容量以及第三接收端的传输容量均满足系统需求之后,发送端还可以确定经过调整后第二接收端的传输容量与经过调整后第三接收端的传输容量之间的差是否在预设传输容量范围内。若确定经过调整后第二接收端的传输容量与经过调整后第三接收端的传输容量之间的差超出预设传输容量范围,则发送端调整为第二接收端分配的子载波以及为第三接收端分配的子载波,使得经过调整后第二接收端的传输容量与经过调整后第三接收端的传输容量之间的差在预设传输容量范围内。若经过调整后第一接收端的传输容量与经过调整后第二接收端的传输容量之间的差在预设传输容量范围内,则发送端则不再调整为所述第二接收端分配的子载波以及为第一接收端分配的子载波。Optionally, after determining that the transmission capacity of the second receiving end and the transmission capacity of the third receiving end meet the system requirements, the transmitting end may further determine the transmission capacity of the adjusted second receiving end and the adjusted transmission capacity of the third receiving end. Whether the difference is within the preset transmission capacity range. If it is determined that the difference between the adjusted transmission capacity of the second receiving end and the adjusted transmission capacity of the third receiving end exceeds the preset transmission capacity range, the transmitting end adjusts to the subcarrier allocated by the second receiving end and is the third receiving The subcarriers allocated by the terminal are such that the difference between the adjusted transmission capacity of the second receiving end and the adjusted transmission capacity of the third receiving end is within a preset transmission capacity range. If the difference between the transmission capacity of the first receiving end and the adjusted transmission capacity of the second receiving end is within the preset transmission capacity, the transmitting end is no longer adjusted to the subcarrier allocated by the second receiving end. And a subcarrier allocated for the first receiving end.
上述设计中,发送端可以使得第二接收端的传输容量与第三接收端的传输容量均满足系统需求,并且使得第二接收端的传输容量与第三接收端的传输容量之间的差在预设传输容量范围内,从而有助于提升系统性能。In the above design, the transmitting end may make the transmission capacity of the second receiving end and the transmission capacity of the third receiving end satisfy the system requirement, and make the difference between the transmission capacity of the second receiving end and the transmission capacity of the third receiving end be at the preset transmission capacity. Scope, which helps to improve system performance.
在一种可能的设计中,在所述发送端根据通信距离与色散补偿值的对应关系,针对分配给不同通信距离对应的接收端的子载波进行色散补偿之后,所述发送端分别将发送给所述至少两个接收端中每个接收端的信号进行傅里叶变换。然后将发送给第四接收端的经过傅里叶变换后的信号映射到为所述第四接收端分配的且经过色散补偿的子载波上,并针对映射后的信号进行反傅里叶变换后发送,所述第四接收端为所述至少两个接收端中的任意一个。In a possible design, after the transmission end performs dispersion compensation for the subcarriers allocated to the receiving end corresponding to different communication distances according to the correspondence between the communication distance and the dispersion compensation value, the transmitting end respectively sends the information to the transmitting end. A signal of each of the at least two receiving ends is subjected to Fourier transform. And then mapping the Fourier-transformed signal sent to the fourth receiving end to the dispersion-compensated sub-carrier allocated to the fourth receiving end, and performing inverse Fourier transform on the mapped signal and transmitting The fourth receiving end is any one of the at least two receiving ends.
上述设计中,发送端通过在根据通信距离与色散补偿值的对应关系,针对分配给不同通信距离对应的接收端的子载波进行色散补偿之后,将发送给第四接收端的经过傅里叶变换后的信号映射到为所述第四接收端分配的且经过色散补偿的子载波上进行发送,有助于缓解第四接收端接收到的电信号的衰落现象。In the above design, after the dispersion is compensated for the subcarriers allocated to the receiving end corresponding to different communication distances according to the correspondence between the communication distance and the dispersion compensation value, the transmitting end transmits the Fourier transform to the fourth receiving end. The signal is mapped to the sub-carrier allocated for the fourth receiving end and is subjected to dispersion compensation, which helps to alleviate the fading phenomenon of the electrical signal received by the fourth receiving end.
可选的,发送端也可以在根据通信距离与色散补偿值的对应关系,针对分配给不同通信距离对应的接收端的子载波进行色散补偿之前(也就是,发送端针对分配给第四接收端的子载波进行色散补偿之前),将发送给第四接收端的时域信号进行傅里叶变换。然后将发送给第四接收端的经过傅里叶变换后的信号映射到为所述第四接收端分配的子载波上。之后针对映射子载波后的信号补偿第四接收端与发送端之间的通信距离所对应的色散补偿值(相当于针对分配给第四接收端的子载波补偿第四接收端与发送端之间的通信距离所对应的色散补偿值)。最后针对补偿后的信号进行反傅里叶变换后发送给所述第四接收端。Optionally, the transmitting end may also perform the dispersion compensation on the subcarriers allocated to the receiving end corresponding to different communication distances according to the correspondence between the communication distance and the dispersion compensation value (that is, the transmitting end is allocated to the child allocated to the fourth receiving end. Before the carrier performs dispersion compensation, the time domain signal sent to the fourth receiving end is Fourier transformed. The Fourier transformed signal transmitted to the fourth receiving end is then mapped onto the subcarriers allocated for the fourth receiving end. Then, the signal after mapping the subcarriers is compensated for the dispersion compensation value corresponding to the communication distance between the fourth receiving end and the transmitting end (corresponding to the subcarrier compensation allocated to the fourth receiving end between the fourth receiving end and the transmitting end) The dispersion compensation value corresponding to the communication distance). Finally, the compensated signal is subjected to inverse Fourier transform and then sent to the fourth receiving end.
上述设计中,发送端针对映射子载波后的信号补偿第四接收端与发送端之间的通信距离所对应的色散补偿值,有助于缓解第四接收端接收到的电信号的衰落现象。In the above design, the transmitting end compensates the dispersion compensation value corresponding to the communication distance between the fourth receiving end and the transmitting end for the signal after mapping the subcarrier, which helps to alleviate the fading phenomenon of the electrical signal received by the fourth receiving end.
第二方面,本申请实施例提供一种色散补偿装置,所述装置应用于发送端,所述发送端与至少两个接收端进行通信,且所述发送端与所述至少两个接收端之间的通信距离不同,所述装置包括:分配单元,用于获取子载波分配结果,所述子载波分配结果中包括基于所述发送端与所述至少两个接收端之间传输信号的信噪比结果为所述至少两个接收端分配的子载波;补偿单元,用于根据通信距离与色散补偿值的对应关系,针对所述分配单元获取的子载波分配结果中包括的分配给不同通信距离对应的接收端的子载波进行色散补偿。In a second aspect, the embodiment of the present application provides a dispersion compensation apparatus, where the apparatus is applied to a transmitting end, the transmitting end communicates with at least two receiving ends, and the transmitting end and the at least two receiving ends The communication distance is different, the device includes: an allocation unit, configured to acquire a subcarrier allocation result, where the subcarrier allocation result includes a signal and noise based on a signal transmitted between the transmitting end and the at least two receiving ends The result is a subcarrier allocated to the at least two receiving ends; a compensation unit, configured to allocate, according to a correspondence between the communication distance and the dispersion compensation value, a different communication distance included in the subcarrier allocation result acquired by the allocation unit The corresponding subcarriers of the receiving end perform dispersion compensation.
在一种可能的设计中,所述分配单元,具体用于接收所述至少两个接收端中每个接收
端发送的所述每个接收端与所述发送端之间传输信号的信噪比结果,并基于所述至少两个接收端分别发来的信噪比结果为所述至少两个接收端分配子载波。In a possible design, the allocating unit is specifically configured to receive each of the at least two receiving ends
And a signal to noise ratio result of the signal transmitted between each of the receiving end and the transmitting end, and the signal to noise ratio result sent by the at least two receiving ends is allocated to the at least two receiving ends Subcarrier.
在一种可能的设计中,所述分配单元,具体用于在预设载波包括的多个子载波上分别向所述至少两个接收端发送探测信号,并接收所述至少两个接收端中每个接收端发来的基于所述探测信号确定的信噪比结果;所述信噪比结果中包括所述预设载波中每个子载波对应的信噪比值。然后确定所述预设载波中的第i个子载波对应的第一信噪比值是所述第i个子载波对应的多个信噪比值中最大的;其中,包括所述第一信噪比值的信噪比结果是由第一接收端发来的;所述i取遍不大于所述预设载波包括的子载波数量的正整数。之后将所述第i个子载波分配给所述第一接收端,所述第一接收端为至少两个接收端中的任意一个。In a possible design, the allocating unit is configured to send a sounding signal to the at least two receiving ends on the plurality of subcarriers included in the preset carrier, and receive each of the at least two receiving ends. a signal to noise ratio result determined by the receiving end based on the detection signal; the signal to noise ratio result includes a signal to noise ratio value corresponding to each subcarrier in the preset carrier. And determining that the first signal to noise ratio value corresponding to the i th subcarrier in the preset carrier is the largest one of the plurality of signal to noise ratio values corresponding to the i th subcarrier; wherein the first signal to noise ratio is included The signal to noise ratio result of the value is sent by the first receiving end; the i is taken over a positive integer not greater than the number of subcarriers included in the preset carrier. The ith subcarrier is then allocated to the first receiving end, and the first receiving end is any one of at least two receiving ends.
在一种可能的设计中,所述分配单元,具体用于在预设载波包括的多个子载波上分别向所述至少两个接收端发送探测信号,并接收所述至少两个接收端中每个接收端发来的基于所述探测信号确定的信噪比结果;所述信噪比结果中包括所述预设载波中每个子载波对应的信噪比值。然后确定所述预设载波中的第j个子载波对应的第二信噪比值是所述第j个子载波对应的多个信噪比值中最大的;其中,包括所述第二信噪比值的信噪比结果是由第二接收端发来的;所述j取遍不大于所述预设载波包括的子载波数量的正整数,并将所述第j个子载波分配给所述第二接收端。之后确定为所述第二接收端分配的各个子载波分别对应的信噪比值的和值,以及确定为第三接收端分配的各个子载波分别对应的信噪比值的和值,所述第二接收端与所述第三接收端为所述至少两个接收端中的任意两个接收端。并在确定为所述第二接收端分配的子载波对应的和值与为所述第三接收端分配的子载波对应的和值之间的差超出预设范围时,调整为所述第二接收端分配的子载波以及为所述第三接收端分配的子载波,使得为所述第二接收端分配的子载波对应的和值与为所述第三接收端分配的子载波对应的和值之间的差在预设范围内。In a possible design, the allocating unit is configured to send a sounding signal to the at least two receiving ends on the plurality of subcarriers included in the preset carrier, and receive each of the at least two receiving ends. a signal to noise ratio result determined by the receiving end based on the detection signal; the signal to noise ratio result includes a signal to noise ratio value corresponding to each subcarrier in the preset carrier. And determining, by the second signal-to-noise ratio value corresponding to the j-th sub-carrier, the second signal-to-noise ratio corresponding to the j-th sub-carrier; wherein the second signal-to-noise ratio is included The signal-to-noise ratio result of the value is sent by the second receiving end; the j takes a positive integer not greater than the number of subcarriers included in the preset carrier, and allocates the jth subcarrier to the first Two receiving ends. And determining a sum of signal to noise ratio values corresponding to the respective subcarriers allocated to the second receiving end, and determining a sum of signal to noise ratio values corresponding to the respective subcarriers allocated to the third receiving end, The second receiving end and the third receiving end are any two of the at least two receiving ends. And adjusting to the second when the difference between the sum value corresponding to the subcarrier allocated to the second receiving end and the sum value corresponding to the subcarrier allocated to the third receiving end exceeds a preset range a subcarrier allocated by the receiving end and a subcarrier allocated to the third receiving end, such that a sum value corresponding to the subcarrier allocated to the second receiving end and a subcarrier corresponding to the third receiving end are allocated The difference between the values is within the preset range.
在一种可能的设计中,所述装置还包括傅里叶变换单元以及反傅里叶变换单元。In one possible design, the apparatus further includes a Fourier transform unit and an inverse Fourier transform unit.
所述傅里叶变换单元,用于在所述补偿单元根据通信距离与色散补偿值的对应关系,针对分配给不同通信距离对应的接收端的子载波进行色散补偿之后,分别将发送给所述至少两个接收端中每个接收端的信号进行傅里叶变换。所述补偿单元,还用于将发送给第四接收端的经过所述傅里叶变换单元变换后的信号映射到为所述第四接收端分配的且经过色散补偿的子载波上,所述第四接收端为所述至少两个接收端中的任意一个。所述反傅里叶变换单元,用于针对所述补偿单元映射后的信号进行反傅里叶变换后发送给所述第四接收端。The Fourier transform unit is configured to send, to the compensation unit, the dispersion to the subcarriers corresponding to the receiving end corresponding to different communication distances according to the correspondence between the communication distance and the dispersion compensation value, and then send the The signal at each of the two receiving ends is Fourier transformed. The compensation unit is further configured to map, by the Fourier transform unit, the signal transformed by the Fourier transform unit to the fourth receiver, and the dispersion-compensated subcarrier, the The four receiving ends are any one of the at least two receiving ends. The inverse Fourier transform unit is configured to perform inverse Fourier transform on the signal mapped by the compensation unit, and then send the signal to the fourth receiving end.
或者,所述傅里叶变换单元,用于在所述补偿单元根据通信距离与色散补偿值的对应关系,针对分配给不同通信距离对应的接收端的子载波进行色散补偿之前,分别将发送给所述至少两个接收端中每个接收端的信号进行傅里叶变换;所述分配单元,还用于将发送给第四接收端的经过所述傅里叶变换单元变换后的信号映射到为所述第四接收端分配的子载波上,所述第四接收端为所述至少两个接收端中的任意一个;所述补偿单元,在根据通信距离与色散补偿值的对应关系,针对所述分配单元获取的子载波分配结果中包括的分配给不同通信距离对应的接收端的子载波进行色散补偿时,具体用于根据通信距离与色散补偿值的对应关系,针对所述分配单元映射子载波后的信号进行色散补偿;所述反傅里叶变换单元,用于针对所述补偿单元补偿后的信号进行反傅里叶变换后发送给所述第四接收
端。Alternatively, the Fourier transform unit is configured to send to the compensation unit according to the correspondence between the communication distance and the dispersion compensation value, before performing dispersion compensation on the subcarriers allocated to the receiving end corresponding to different communication distances. a signal of each of the at least two receiving ends is subjected to Fourier transform; the allocating unit is further configured to map the signal transformed by the Fourier transform unit sent to the fourth receiving end to the On the subcarrier allocated by the fourth receiving end, the fourth receiving end is any one of the at least two receiving ends; the compensation unit is configured to allocate according to the correspondence between the communication distance and the dispersion compensation value. When the subcarriers of the receiving end corresponding to the different communication distances are used for the chromatic dispersion compensation included in the subcarrier allocation result obtained by the unit, specifically used for mapping the subcarriers according to the correspondence between the communication distance and the dispersion compensation value for the allocation unit The signal is subjected to dispersion compensation; the inverse Fourier transform unit is configured to perform inverse on the compensated signal of the compensation unit After the Fourier transform to a fourth reception
end.
第三方面,本申请实施例还提供了一种发送端,所述发送端与至少两个接收端进行通信,且所述发送端与所述至少两个接收端之间的通信距离不同。该发送包括处理器和存储器,所述存储器用于存储软件程序,所述处理器用于读取所述存储器中存储的软件程序并实现第一方面或上述第一方面的任意一种设计提供的方法。In a third aspect, the embodiment of the present application further provides a sending end, where the sending end communicates with at least two receiving ends, and a communication distance between the sending end and the at least two receiving ends is different. The transmitting includes a processor for storing a software program, the processor for reading a software program stored in the memory and implementing the method provided by any one of the first aspect or the first aspect above .
第四方面,本申请实施例中还提供一种计算机存储介质,该存储介质中存储软件程序,该软件程序在被一个或多个处理器读取并执行时可实现第一方面或上述第一方面的任意一种设计提供的方法。In a fourth aspect, the embodiment of the present application further provides a computer storage medium, where the software program stores a software program, where the software program can implement the first aspect or the first one when being read and executed by one or more processors Any of the aspects provided by the design.
第五方面,本申请实施例提供了一种包含指令的计算机程序产品,当其在计算机上运行时,使得计算机执行上述第一方面或上述第一方面的任意一种设计提供的方法。In a fifth aspect, an embodiment of the present application provides a computer program product comprising instructions, when executed on a computer, causing a computer to perform the method provided by any one of the above first aspect or the first aspect.
图1为本申请实施例提供的一种通信系统架构示意图;FIG. 1 is a schematic structural diagram of a communication system according to an embodiment of the present application;
图2为本申请实施例提供的三个接收端中每个接收端转换后的电信号的信噪比结果示意图;2 is a schematic diagram of a signal to noise ratio result of an electrical signal converted by each receiving end of three receiving ends according to an embodiment of the present disclosure;
图3为本申请实施例提供的三个接收端分别对应的信噪比结果示意图;FIG. 3 is a schematic diagram of signal to noise ratio results corresponding to three receiving ends according to an embodiment of the present disclosure;
图4为本申请实施例提供的发送端针对三个接收端划分频带的结果示意图;4 is a schematic diagram of a result of dividing a frequency band by a transmitting end for three receiving ends according to an embodiment of the present disclosure;
图5为本申请实施例提供的一种色散补偿装置的结构示意图;FIG. 5 is a schematic structural diagram of a dispersion compensation apparatus according to an embodiment of the present disclosure;
图6A为本申请实施例提供的针对通信距离为80km的接收端分别补偿80km对应的色散补偿值和40km对应的色散补偿值后的信噪比对比图;FIG. 6A is a comparison diagram of a signal to noise ratio after a dispersion compensation value corresponding to 80 km and a dispersion compensation value corresponding to 40 km are respectively compensated for a receiving end with a communication distance of 80 km according to an embodiment of the present disclosure;
图6B为本申请实施例提供的针对通信距离为40km的接收端分别补偿40km对应的色散补偿值和80km对应的色散补偿值后的信噪比对比图;FIG. 6B is a comparison diagram of a signal to noise ratio after a dispersion compensation value corresponding to 40 km and a dispersion compensation value corresponding to 80 km are respectively compensated for a receiving end with a communication distance of 40 km according to an embodiment of the present disclosure;
图6C为本申请实施例提供的针对通信距离为80km的接收端分别补偿80km对应的色散补偿值和60km对应的色散补偿值后的信噪比对比图;FIG. 6C is a comparison diagram of a signal to noise ratio after a dispersion compensation value corresponding to 80 km and a dispersion compensation value corresponding to 60 km are respectively compensated for a receiving end with a communication distance of 80 km according to an embodiment of the present disclosure;
图6D为本申请实施例提供的针对通信距离为40km的接收端分别补偿40km对应的色散补偿值和60km对应的色散补偿值后的信噪比对比图;6D is a comparison diagram of signal to noise ratios after the compensation end of the communication distance of 40 km is compensated for the dispersion compensation value corresponding to 40 km and the dispersion compensation value corresponding to 60 km, respectively, provided by the embodiment of the present application;
图7为本申请实施例提供的一种短距离光通信系统的结构示意图;FIG. 7 is a schematic structural diagram of a short-distance optical communication system according to an embodiment of the present disclosure;
图8A为本申请实施例提供的一种DDMZM的结构示意图;FIG. 8A is a schematic structural diagram of a DDMZM according to an embodiment of the present disclosure;
图8B为本申请实施例提供的一种DDMZM的功率调制曲线的示意图;FIG. 8B is a schematic diagram of a power modulation curve of a DDMZM according to an embodiment of the present application; FIG.
图9为本申请实施例提供的一种色散补偿方法的流程示意图;FIG. 9 is a schematic flowchart diagram of a dispersion compensation method according to an embodiment of the present disclosure;
图10为本申请实施例提供的第一接收端的信噪比结果以及第二接收端的信噪比结果示意图;10 is a schematic diagram of a signal to noise ratio result of a first receiving end and a signal to noise ratio result of a second receiving end according to an embodiment of the present application;
图11为本申请实施例提供的发送端为第一接收端分配的子载波,以及发送端为第二接收端分配的子载波示意图;FIG. 11 is a schematic diagram of a subcarrier allocated by a transmitting end to a first receiving end, and a subcarrier allocated by a transmitting end to a second receiving end according to an embodiment of the present disclosure;
图12为本申请实施例提供的发送端分别通过现有方案一、现有方案二以及本申请实施例提供的色散补偿方法解决光纤色散问题时系统容量的对比图;FIG. 12 is a comparison diagram of system capacity when the transmission end solves the fiber dispersion problem by using the existing solution 1 and the existing solution 2 and the dispersion compensation method provided by the embodiment of the present application;
图13为本申请实施例提供的通过现有技术中点到点色散补偿方法进行色散补偿时和通过本申请实施例提供的色散补偿方法进行色散补偿时接收端对应的误码率-信噪比曲线的对比图;FIG. 13 is a diagram showing a bit error rate-signal-to-noise ratio corresponding to a receiving end when performing dispersion compensation by the prior art point-to-point dispersion compensation method according to the prior art and the dispersion compensation method provided by the embodiment of the present application. a comparison chart of the curves;
图14为本申请实施例提供的一种色散补偿装置的结构示意图;
FIG. 14 is a schematic structural diagram of a dispersion compensation apparatus according to an embodiment of the present disclosure;
图15为本申请实施例提供的一种终端实现方式的结构示意图。FIG. 15 is a schematic structural diagram of a terminal implementation manner according to an embodiment of the present disclosure.
参见图1所示,为本申请实施例提供的通信系统。系统中包括一个发送端以及多个接收端。发送端与所述多个接收端之间的通信距离不同,图1中以一个发送端与三个接收端为例。发送端通过光纤与接收端通信的过程中,由于光纤色散会产生功率衰落。在发送端与不同的接收端之间的通信距离不同时,产生功率衰落的情况不一样。Referring to FIG. 1 , a communication system provided by an embodiment of the present application. The system includes a sender and multiple receivers. The communication distance between the transmitting end and the plurality of receiving ends is different. In FIG. 1, one transmitting end and three receiving ends are taken as an example. During the process of communication between the transmitting end and the receiving end through the optical fiber, power fading occurs due to fiber dispersion. When the communication distance between the transmitting end and the different receiving end is different, the situation in which power fading occurs is different.
以图1所示的通信系统为例,发送端与第一接收端之间的通信距离为10km,发送端与第二接收端之间的通信距离为40km,发送端与第三接收端之间的通信距离为80km,发送端在频率范围为[0,36]GHz的载波包括的多个子载波上分别向三个接收端发送光信号。发送端发送的光信号经过光纤传输后分别到达三个接收端,三个接收端分别将接收到的光信号转换成电信号,参阅图2所示,为三个接收端中每个接收端转换后的电信号的信噪比结果,该信噪比结果中包括频率范围为[0,36]GHz的载波中每个子载波所对应的信噪比值。从图2中可以看出,针对同一个子载波,不同通信距离的接收端的信噪比值并不相同。也就是说明,针对同一个子载波,不同通信距离的接收端对应的功率衰落的情况不一样。Taking the communication system shown in FIG. 1 as an example, the communication distance between the transmitting end and the first receiving end is 10 km, and the communication distance between the transmitting end and the second receiving end is 40 km, between the transmitting end and the third receiving end. The communication distance is 80 km, and the transmitting end transmits optical signals to the three receiving ends on the plurality of subcarriers included in the carrier whose frequency range is [0, 36] GHz. The optical signals transmitted by the transmitting end are respectively transmitted to the three receiving ends after being transmitted through the optical fiber, and the three receiving ends respectively convert the received optical signals into electrical signals. Referring to FIG. 2, each receiving end of the three receiving ends is converted. The signal-to-noise ratio of the subsequent electrical signal results in a signal-to-noise ratio corresponding to each subcarrier in the carrier having a frequency range of [0, 36] GHz. It can be seen from FIG. 2 that the signal-to-noise ratio values of the receiving ends of different communication distances are not the same for the same subcarrier. That is to say, for the same subcarrier, the power fading corresponding to the receiving end of different communication distances is different.
目前常用的解决光纤色散的方法有,现有方案一:对于不同通信距离的接收端,以该接收端的信噪比值是否超过预设阈值划分频带,信噪比值超过预设阈值认为频带可用,信噪比值不超过预设阈值认为频带不可用,从而避免在衰落情况比较严重的频带上向接收端发送光信号,从而解决光纤色散的问题。At present, there are commonly used methods for solving fiber dispersion. The existing solution 1: for the receiving end of different communication distances, whether the signal-to-noise ratio of the receiving end exceeds a preset threshold to divide the frequency band, and the signal-to-noise ratio exceeds a preset threshold to consider that the frequency band is available. If the signal-to-noise ratio does not exceed the preset threshold, the frequency band is considered unusable, so as to avoid transmitting the optical signal to the receiving end in a frequency band with a relatively bad fading condition, thereby solving the problem of fiber dispersion.
以图1所示的通信系统,预设阈值为-3db为例,发送端与第一接收端之间的通信距离为25km,发送端与第二接收端之间的通信距离为50km,发送端与第三接收端之间的通信距离为100km。假设,发送端与接收端通信可以采用的载波频段是[0,10]GHz。参阅图3所示,为三个接收端分别对应的信噪比结果。针对第一接收端,信噪比值超过-3db对应的频带为[0,5.9]GHz,因此第一接收端可以使用频带[0,5.9]GHz;同理,第二接收端可以使用频带[0,4.2]GHz以及[9,10]GHz的,而不可以使用频带[4.2,9]GHz。第三接收端可以使用频带[0,2.9]GHz以及[6.3,9]GHz,而不可以使用频带[2.9,6.3]GHz以及[9,10]GHz。具体参阅图4所示,为发送端针对三个接收端划分频带的结果。Taking the communication system shown in FIG. 1 as a preset threshold value of -3 db, the communication distance between the transmitting end and the first receiving end is 25 km, and the communication distance between the transmitting end and the second receiving end is 50 km, and the transmitting end The communication distance with the third receiving end is 100 km. It is assumed that the carrier frequency band that can be used for communication between the transmitting end and the receiving end is [0, 10] GHz. Referring to FIG. 3, the signal-to-noise ratio results corresponding to the three receiving ends are respectively shown. For the first receiving end, the frequency band corresponding to the signal-to-noise ratio value exceeding -3db is [0, 5.9] GHz, so the first receiving end can use the frequency band [0, 5.9] GHz; similarly, the second receiving end can use the frequency band [ 0, 4.2] GHz and [9, 10] GHz, and the band [4.2, 9] GHz cannot be used. The third receiving end can use the bands [0, 2.9] GHz and [6.3, 9] GHz instead of the bands [2.9, 6.3] GHz and [9, 10] GHz. Referring specifically to FIG. 4, the result of dividing the frequency band for the three receiving ends at the transmitting end.
然而,通过发送端为不同通信距离的接收端分配不同的子载波的方法解决光纤色散的问题时,所有发送端在某些子载波上的信噪比值均小于预设阈值,则这些子载波则不可用,以图3所示的信噪比结果以及图4所示的划分频带的结果为例,第一接收端在频带[5.9,6.3]GHz上的信噪比值小于-3db,因此第一接收端不可以使用频带为[5.9,6.3]GHz;第二接收端在频带[5.9,6.3]GHz上的信噪比值也小于-3db,因此第二接收端也不可以使用频带为[5.9,6.3]GHz;第三接收端在频带[5.9,6.3]GHz上的信噪比值同样小于-3db,因此第三接收端同样不可以使用频带为[5.9,6.3]GHz。因此,频带为[5.9,6.3]GHz则不可用,导致资源浪费。However, when the problem of fiber dispersion is solved by the method in which the transmitting end allocates different subcarriers for the receiving ends of different communication distances, the signal to noise ratio values of all the transmitting ends on some subcarriers are less than a preset threshold, then these subcarriers It is not available. Taking the signal-to-noise ratio result shown in FIG. 3 and the result of dividing the frequency band shown in FIG. 4 as an example, the signal-to-noise ratio of the first receiving end in the frequency band [5.9, 6.3] GHz is less than -3 db, so The first receiving end cannot use the frequency band [5.9,6.3] GHz; the second receiving end has a signal-to-noise ratio value of less than -3 db in the frequency band [5.9, 6.3] GHz, so the second receiving end cannot use the frequency band as [5.9, 6.3] GHz; the signal-to-noise ratio of the third receiver at the band [5.9, 6.3] GHz is also less than -3 db, so the third receiver can also use the band [5.9, 6.3] GHz. Therefore, the band is [5.9, 6.3] GHz is not available, resulting in wasted resources.
除了现有方案一,目前常用的解决光纤色散的方法还有现有方案二:发送端针对电信号补偿一个预配置的色散补偿值,然后将经过补偿后的电信号转换成光信号发送给接收端,从而解决光纤色散的问题。具体可以参阅图5所示,发送端将电信号通过色散补偿模块补偿一个预配置的色散补偿值,然后通过数模转换模块(英文:digital to analog converter,简称:DAC)以及并行双电极马赫曾德尔调制器(英文:dual-drive mach-zehnder modulator,
简称:DDMZM)将经过色散补偿的电信号转换成光信号。发送端将转换后的光信号通过单模光纤(英文:single mode fiber,简称:SMF)发送给接收端,从而接收端在接收到该光信号后通过滤波器、光接收模块(英文:receiver optical sub assembly,简称:ROSA)、示波器(英文:oscilloscope,简称:OSC)以及数字信号处理模块(英文:digital signal process,简称:DSP)将接收到的光信号转换成电信号。In addition to the existing scheme 1, the currently used method for solving the fiber dispersion has the existing scheme 2: the transmitting end compensates a pre-configured dispersion compensation value for the electrical signal, and then converts the compensated electrical signal into an optical signal for transmission to the receiving. To solve the problem of fiber dispersion. Specifically, as shown in FIG. 5, the transmitting end compensates a pre-configured dispersion compensation value by the dispersion compensation module, and then passes through a digital-to-analog converter (English: digital to analog converter, DAC) and parallel two-electrode Mach. Del modulator (English: dual-drive mach-zehnder modulator,
Abbreviation: DDMZM) Converts the dispersion-compensated electrical signal into an optical signal. The transmitting end sends the converted optical signal to the receiving end through a single mode fiber (English: single mode fiber, SMF for short), so that the receiving end passes the filter and the optical receiving module after receiving the optical signal (English: Receiver optical) Sub assembly, referred to as: ROSA), oscilloscope (English: oscilloscope, abbreviation: OSC) and digital signal processing module (English: digital signal process, referred to as: DSP) converts the received optical signal into an electrical signal.
但是在一个发送端与多个接收端进行通信的应用场景中,发送端与不同的接收端之间的通信距离不同,因此对应的色散不同,从而需要的色散补偿值不同。因此对于不同的通信距离补偿相同的色散补偿值,会导致针对发送给某些接收端的信号补偿过度或补偿不足,从而这些接收端接收到的信号依然会产生功率衰落,严重影响系统性能。However, in an application scenario where a transmitting end communicates with multiple receiving ends, the communication distance between the transmitting end and the different receiving ends is different, and thus the corresponding dispersion is different, so that the required dispersion compensation values are different. Therefore, compensating the same dispersion compensation value for different communication distances may result in excessive or insufficient compensation for signals transmitted to some receiving ends, so that the signals received by these receiving ends still generate power fading, which seriously affects system performance.
以发送端与第一接收端之间的通信距离为80km,发送端与第二接收端之间的通信距离为40km为例,针对第一接收端和第二接收端补偿相同的色散补偿值。当补偿的色散补偿值为40km对应的色散补偿值时,如图6A所示,通过将第一接收端在补偿40km对应的色散补偿值后接收到的信号的信噪比结果和在补偿80km对应的色散补偿值后接收到的信号的信噪比结果进行比较,可以看出,针对第一接收端补偿40km对应的色散补偿值时,由于补偿不足,第一接收端接收到的信号依然会产生功率衰落。当补偿的色散补偿值为80km对应的色散补偿值时,如图6B所示,通过将第二接收端在补偿40km对应的色散补偿值后接收到的信号的信噪比结果和在补偿80km对应的色散补偿值后接收到的信号的信噪比结果进行比较,可以看出,针对第二接收端补偿80km对应的色散补偿值时,由于补偿过度,第二接收端接收到的信号依然会产生功率衰落。当补偿的色散补偿值为60km对应的色散补偿值时,如图6C所示,通过将第一接收端在补偿60km对应的色散补偿值后接收到的信号的信噪比结果和在补偿80km对应的色散补偿值后接收到的信号的信噪比结果进行比较,可以看出,针对发送给第一接收端信号补偿60km对应的色散补偿值时,第一接收端接收到的信号依然会产生功率衰落。以及,如图6C所示,将第二接收端在补偿40km对应的色散补偿值后接收到的信号的信噪比结果和在补偿60km对应的色散补偿值后接收到的信号的信噪比结果进行比较,可以看出,针对发送给第二接收端信号补偿60km对应的色散补偿值时,第二接收端接收到的信号依然会产生功率衰落。For example, the communication distance between the transmitting end and the first receiving end is 80 km, and the communication distance between the transmitting end and the second receiving end is 40 km. For the first receiving end and the second receiving end, the same dispersion compensation value is compensated. When the compensated dispersion compensation value is a dispersion compensation value corresponding to 40 km, as shown in FIG. 6A, the signal-to-noise ratio result of the signal received by the first receiving end after compensating for the dispersion compensation value corresponding to 40 km corresponds to the compensation of 80 km. Comparing the signal-to-noise ratio results of the received signals after the dispersion compensation value, it can be seen that when the dispersion compensation value corresponding to 40 km is compensated for the first receiving end, the signal received by the first receiving end still generates due to insufficient compensation. Power fading. When the compensated dispersion compensation value is a dispersion compensation value corresponding to 80 km, as shown in FIG. 6B, the signal-to-noise ratio result of the signal received by the second receiving end after compensating the dispersion compensation value corresponding to 40 km corresponds to the compensation of 80 km. Comparing the signal-to-noise ratio results of the received signals after the dispersion compensation value, it can be seen that when the dispersion compensation value corresponding to 80 km is compensated for the second receiving end, the signal received by the second receiving end is still generated due to excessive compensation. Power fading. When the compensated dispersion compensation value is a dispersion compensation value corresponding to 60 km, as shown in FIG. 6C, the signal-to-noise ratio result of the signal received by the first receiving end after compensating for the dispersion compensation value corresponding to 60 km corresponds to the compensation of 80 km. Comparing the signal-to-noise ratio results of the received signal after the dispersion compensation value, it can be seen that when the dispersion compensation value corresponding to 60 km is compensated for the signal transmitted to the first receiving end, the signal received by the first receiving end still generates power. Decline. And, as shown in FIG. 6C, the signal-to-noise ratio result of the signal received by the second receiving end after compensating the dispersion compensation value corresponding to 40 km and the signal-to-noise ratio result of the signal received after compensating the dispersion compensation value corresponding to 60 km For comparison, it can be seen that when the dispersion compensation value corresponding to 60 km is compensated for the signal transmitted to the second receiving end, the signal received by the second receiving end still generates power fading.
基于此,本申请实施例提供一种色散补偿方法及装置,以解决一个发送端与多个接收端进行通信的应用场景中的光纤色散问题。其中,方法和装置是基于同一发明构思的,由于方法及装置解决问题的原理相似,因此装置与方法的实施可以相互参见,重复之处不再赘述。Based on this, the embodiment of the present application provides a dispersion compensation method and device to solve the fiber dispersion problem in an application scenario in which a transmitting end communicates with multiple receiving ends. The method and the device are based on the same inventive concept. Since the principles of the method and the device for solving the problem are similar, the implementation of the device and the method can be referred to each other, and the repeated description is not repeated.
为了使得本申请的实施例更容易被理解,下面,首先对本申请的实施例中涉及的一些描述加以说明,这些说明不应视为对本申请所要求的保护范围的限定。In order to make the embodiments of the present application easier to understand, the following description of the embodiments of the present application is to be construed as a limitation of the scope of the claims.
信噪比(英文:signal-to-noise ratio,简称:SNR)是描述信号中有效成分与噪声成分的比例关系参数。The signal-to-noise ratio (SNR) is a parameter that describes the proportional relationship between the active component and the noise component in the signal.
共轭信号指模值相等,相位相反的两个信号。The conjugate signal refers to two signals with equal modulo values and opposite phases.
系统需求指系统针对接收端预设的性能要求,该性能要求包括传输容量、信噪比、传输容量范围、信噪比范围等等。如预设传输容量为28Gb/s,当接收端实际的传输容量大于或等于28Gb/s时,则该接收端满足系统需求,反之,则不满足系统需求;或者,预设信噪比13dB,当接收端接收到的信号的信噪比大于或等于13dB时,则该接收端满足系统需求,反之,则不满足系统需求。或者,预设传输容量范围为[2,4]Gb/s,当任意两个接收端的
传输容量之差在[2,4]Gb/s范围内时,则这两个接收端满足系统需求,反之,则不满足系统需求;或者,预设信噪比范围[0,1]dB,当任意两个接收端接收到的信号的信噪比之差在[0,1]dB范围内时,则这两个接收端满足系统需求,反之,则不满足系统需求,等等。System requirements refer to the system's preset performance requirements for the receiver. The performance requirements include transmission capacity, signal-to-noise ratio, transmission capacity range, signal-to-noise ratio range, and so on. If the preset transmission capacity is 28Gb/s, when the actual transmission capacity of the receiving end is greater than or equal to 28Gb/s, the receiving end satisfies the system requirements, and vice versa, the system requirements are not met; or, the preset signal-to-noise ratio is 13dB. When the signal-to-noise ratio of the signal received by the receiving end is greater than or equal to 13 dB, the receiving end satisfies the system requirement, and vice versa, the system requirement is not met. Or, the preset transmission capacity ranges from [2, 4] Gb/s, when any two receivers
When the difference of transmission capacity is within the range of [2, 4] Gb/s, the two receivers satisfy the system requirements, and vice versa, the system requirements are not met; or, the preset signal-to-noise ratio range [0, 1] dB, When the difference between the signal-to-noise ratios of the signals received by any two receiving ends is within the range of [0, 1] dB, then the two receiving ends satisfy the system requirements, and vice versa, the system requirements are not met, and so on.
多个,是指两个或两个以上。Multiple means two or more.
另外,需要理解的是,在本申请的描述中,“第一”、“第二”等词汇,仅用于区分描述的目的,而不能理解为指示或暗示相对重要性,也不能理解为指示或暗示顺序。In addition, it should be understood that in the description of the present application, the terms "first", "second" and the like are used only to distinguish the purpose of description, and are not to be understood as indicating or implying relative importance, nor as an indication. Or suggest the order.
下面将结合附图对本申请实施例作进一步地详细描述。The embodiments of the present application will be further described in detail below with reference to the accompanying drawings.
本申请实施例提供的一种短距离光通信系统,该系统包括一个发送端以及多个接收端。其中,所述发送端与所述多个接收端之间的通信距离不同。该短距离光通信系统可以为如图1所示的通信系统。A short-range optical communication system provided by an embodiment of the present application includes a transmitting end and a plurality of receiving ends. The communication distance between the sending end and the multiple receiving ends is different. The short-range optical communication system may be a communication system as shown in FIG. 1.
以该短距离光通信系统中包括两个接收端,分别为第一接收端和第二接收端为例,具体参阅图7所示,为本申请实施例提供的一种短距离光通信系统的结构示意图,在该短距离光通信系统中,发送端可以包括信号生成模块、色散补偿模块、数模转换器(英文:digital to analog converter,简称:DAC)以及DDMZM。信号生成模块或者色散补偿模块可以由一个或者多个通用处理器实现,通用处理器可以是中央处理单元(英文:central processing unit,简称CPU),或者为数字处理单元等等。The short-distance optical communication system includes two receiving ends, which are respectively a first receiving end and a second receiving end. For details, refer to FIG. 7 , which is a short-distance optical communication system provided by an embodiment of the present application. The schematic diagram shows that in the short-distance optical communication system, the transmitting end can include a signal generating module, a dispersion compensation module, a digital-to-analog converter (English: digital to analog converter, referred to as DAC), and DDMZM. The signal generation module or the dispersion compensation module may be implemented by one or more general-purpose processors, which may be central processing units (CPUs), or digital processing units, and the like.
其中,信号生成模块,用于生成发送给第一接收端和第二接收端的时域信号。The signal generating module is configured to generate a time domain signal that is sent to the first receiving end and the second receiving end.
具体的,该信号生成模块可以通过如下方式生成发送给第一接收端和第二接收端的时域信号:Specifically, the signal generating module may generate a time domain signal sent to the first receiving end and the second receiving end by:
该信号生成模块首先生成一个二进制比特序列,然后将所述二进制比特序列转换成频域信号,其中,在将所述二进制比特序列转换成频域信号时,保证该频域信号的正频和负频为共轭信号。之后,该信号生成模块将该频域信号经过反傅里叶变换转换为时域信号,其中,该频域信号经过反傅里叶变换时采样点的数量可以为512点。最后,该信号生成模块将转换得到的时域信号与同步信号进行相加,从而得到发送给第一接收端和第二接收端的时域信号。The signal generating module first generates a binary bit sequence and then converts the binary bit sequence into a frequency domain signal, wherein when converting the binary bit sequence into a frequency domain signal, the positive frequency and the negative of the frequency domain signal are guaranteed The frequency is a conjugate signal. Then, the signal generating module converts the frequency domain signal into a time domain signal by inverse Fourier transform, wherein the number of sampling points when the frequency domain signal passes the inverse Fourier transform may be 512 points. Finally, the signal generating module adds the converted time domain signal and the synchronization signal to obtain a time domain signal transmitted to the first receiving end and the second receiving end.
色散补偿模块,用于对发送给第一接收端的时域信号和发送给第二接收端的时域信号分别进行色散补偿。The dispersion compensation module is configured to separately perform dispersion compensation on the time domain signal sent to the first receiving end and the time domain signal sent to the second receiving end.
DAC,用于将经过色散补偿模块进行色散补偿后的信号转换成模拟信号。The DAC is used to convert the dispersion-compensated signal that has undergone the dispersion compensation module into an analog signal.
DDMZM,用于将DAC转换得到的模拟信号转换成光信号。参阅图8A所示,为本申请实施例提供的一种DDMZM的结构示意图。该DDMZM包括上下并行的两个相位调制器(英文:phase modulation,简称:PM):上臂PM和下臂PM,每个PM均包括一个射频(英文:radio frequency,简称:RF)端口和一个偏置端口。可以通过调整两个PM中包括的两个偏置端口的电压差控制该DDMZM的工作状态,例如,当两个PM中包括的两个偏置端口的电压的相位差为π/2时,DDMZM处于最佳工作状态。当调整两个偏置端口偏置在功率调制曲线的1/2点,参阅图8B所示的功率调制曲线时,DDMZM将电信号近似线性地转换到光信号。所述DDMZM还包括一个光输入端口以及一个光输出端口。DDMZM is used to convert the analog signal obtained by DAC conversion into an optical signal. FIG. 8A is a schematic structural diagram of a DDMZM according to an embodiment of the present application. The DDMZM includes two phase modulators (English: phase modulation, PM for short): upper arm PM and lower arm PM, each of which includes a radio frequency (English: radio frequency, abbreviated as: RF) port and a bias Set the port. The operating state of the DDMZM can be controlled by adjusting the voltage difference between the two bias ports included in the two PMs, for example, when the phase difference of the voltages of the two bias ports included in the two PMs is π/2, DDMZM In the best working condition. When adjusting the two bias port offsets at 1/2 of the power modulation curve, referring to the power modulation curve shown in Figure 8B, the DDMZM converts the electrical signal approximately linearly to the optical signal. The DDMZM also includes an optical input port and a light output port.
在该短距离光通信系统中,第一接收端和第二接收端均可以包括滤波器、ROSA、OSC以及DSP模块。In the short-range optical communication system, the first receiving end and the second receiving end may each include a filter, a ROSA, an OSC, and a DSP module.
其中,滤波器,用于滤除接收端接收到的光信号中的带外放大器自发辐射噪声(英文:amplifier spontaneousemission noise,简称:ASE)噪声。
The filter is used for filtering the noise of the out-of-band amplifier spontaneous emission noise (English: amplifier spontaneous emission noise, referred to as ASE) in the optical signal received by the receiving end.
ROSA,用于将滤除了ASE噪声的光信号转换成电信号。ROSA is used to convert an optical signal that filters out ASE noise into an electrical signal.
OSC,用于将ROSA转换得到的电信号转换成数字信号。The OSC is used to convert an electrical signal obtained by ROSA conversion into a digital signal.
DSP,用于对OSC转换得到的数字信号进行处理。DSP for processing digital signals obtained by OSC conversion.
基于图7所示的短距离光通信系统,本申请实施例提供了一种色散补偿方法,如图9所示,该色散补偿方法可以应用于发送端的色散补偿模块,该色散补偿方法具体可以包括如下:Based on the short-distance optical communication system shown in FIG. 7 , the embodiment of the present application provides a dispersion compensation method. As shown in FIG. 9 , the dispersion compensation method can be applied to a dispersion compensation module at a transmitting end, and the dispersion compensation method may specifically include as follows:
S901,所述发送端获取子载波分配结果,所述子载波分配结果中包括基于所述发送端与所述至少两个接收端之间传输信号的信噪比结果为所述至少两个接收端分配的子载波。S901, the sending end acquires a subcarrier allocation result, where the subcarrier allocation result includes a signal to noise ratio result based on a signal transmitted between the transmitting end and the at least two receiving ends, where the at least two receiving ends are Allocated subcarriers.
S902,所述发送端根据通信距离与色散补偿值的对应关系,针对分配给不同通信距离对应的接收端的子载波进行色散补偿。S902. The transmitting end performs dispersion compensation on the subcarriers allocated to the receiving ends corresponding to different communication distances according to the correspondence between the communication distance and the dispersion compensation value.
本申请实施例中通过发送端获取子载波分配结果,所述子载波分配结果中包括基于所述发送端与所述至少两个接收端之间传输信号的信噪比结果为所述至少两个接收端分配的子载波;然后根据通信距离与色散补偿值的对应关系,针对分配给不同通信距离对应的接收端的子载波进行色散补偿。由于发送端与不同的接收端之间的通信距离不同,因此产生的色散不同,从而需要的色散补偿值不同,相比于现有技术中色散补偿方法对于不同的传输距离补偿相同的色散值,本申请实施例中针对每一个传输距离补偿该传输距离对应的色散值,有效的缓解了一个发送端与多个接收端进行通信的应用场景中光纤色散导致的衰落现象,有助于提高光通信系统的性能。In the embodiment of the present application, the subcarrier allocation result is obtained by the sending end, where the subcarrier allocation result includes a signal to noise ratio result based on the transmitted signal between the transmitting end and the at least two receiving ends, and the result is at least two The subcarriers allocated by the receiving end are then subjected to dispersion compensation for the subcarriers allocated to the receiving ends corresponding to different communication distances according to the correspondence between the communication distance and the dispersion compensation value. Since the communication distance between the transmitting end and the different receiving end is different, the generated dispersion is different, and thus the required dispersion compensation value is different. Compared with the prior art dispersion compensation method, the same dispersion value is compensated for different transmission distances, In the embodiment of the present application, the chromatic dispersion value corresponding to the transmission distance is compensated for each transmission distance, which effectively mitigates the fading phenomenon caused by fiber dispersion in an application scenario in which a transmitting end communicates with multiple receiving ends, and helps to improve optical communication. System performance.
在一种可能的实施方式中,所述发送端获取子载波分配结果,可以通过如下方式实现:In a possible implementation manner, the sending end obtains a subcarrier allocation result, which can be implemented as follows:
A1,所述发送端在预设载波包括的多个子载波上分别向所述两个接收端发送探测信号,并接收所述两个接收端中每个接收端发来的基于所述探测信号确定的信噪比结果。所述信噪比结果中包括所述预设载波中每个子载波对应的信噪比值。A1, the sending end sends a sounding signal to the two receiving ends on the plurality of subcarriers included in the preset carrier, and receives a determination based on the detection signal sent by each receiving end of the two receiving ends. The signal to noise ratio results. The signal to noise ratio result includes a signal to noise ratio value corresponding to each subcarrier in the preset carrier.
参阅图10所示,为第一接收端的信噪比结果以及第二接收端的信噪比结果,其中,发送端与第一接收端之间的通信距离为40km,发送端与第二接收端之间的通信距离为80km。Referring to FIG. 10, the result of the signal-to-noise ratio of the first receiving end and the signal-to-noise ratio of the second receiving end, wherein the communication distance between the transmitting end and the first receiving end is 40 km, and the transmitting end and the second receiving end are The communication distance between the two is 80km.
其中,所述探测信号可以为四相相移键控信号(英文:quadrature phase shift keying,简称:QPSK),也可以为二进制相移键控信号(英文:binary phase shift keying,简称:BPSK),也可以为八进制相移键控信号(英文:8phase shift keying,简称:8PSK),也可以为其它信号,本申请实施例在这里不作具体限定。The detection signal may be a quadrature phase shift keying (QPSK) or a binary phase shift keying (BPSK). It can also be an octal phase shift keying signal (8 phase shift keying, 8PSK for short), and other signals. The embodiment of the present application is not specifically limited herein.
A2,所述发送端确定所述预设载波中的第i个子载波对应的第一信噪比值是所述第i个子载波对应的两个信噪比值中最大的;其中,包括所述第一信噪比值的信噪比结果是由第一接收端发来的;所述i取遍不大于所述预设载波包括的子载波数量的正整数。然后将所述第i个子载波分配给所述第一接收端,从而确定为第一接收端分配的子载波。基于同样的方法,所述发送端确定为第二接收端分配的子载波。A2, the sending end determines that the first signal to noise ratio value corresponding to the i th subcarrier in the preset carrier is the largest of the two signal to noise ratio values corresponding to the i th subcarrier; The signal to noise ratio result of the first signal to noise ratio value is sent by the first receiving end; the i is taken over a positive integer not greater than the number of subcarriers included in the preset carrier. The i-th subcarrier is then allocated to the first receiving end to determine a subcarrier allocated for the first receiving end. Based on the same method, the transmitting end determines the subcarrier allocated for the second receiving end.
当该短距离光通信系统中还包括第三接收端时,发送端确定为第三接收端分配的子载波的方法,具体可以参阅发送端确定为第一接收端分配的子载波的方法,本申请实施例在这里不再重复赘述。When the short-distance optical communication system further includes a third receiving end, the sending end determines the method for the sub-carrier allocated by the third receiving end, and the method for determining the sub-carrier allocated by the transmitting end to the first receiving end, The application examples are not repeated here.
具体的,以图10所示的信噪比结果为例,发送端确定为第一接收端分配的子载波,以及确定为第二接收端分配的子载波,可以通过如下方式实现:Specifically, taking the signal-to-noise ratio result shown in FIG. 10 as an example, the sub-carrier allocated by the transmitting end to be determined by the first receiving end and the sub-carrier allocated to the second receiving end may be implemented as follows:
B1,发送端令参考信噪比SNR_Ref等于第一接收端的信噪比结果SNR40。
B1. The transmitting end makes the reference signal to noise ratio SNR_Ref equal to the signal to noise ratio result SNR40 of the first receiving end.
B2,发送端对比第二接收端的信噪比结果SNR80与SNR_Ref每个子载波上的SNR值。B2, the sender compares the SNR value of each of the SNR80 and SNR_Ref subcarriers with respect to the signal to noise ratio of the second receiver.
B3,发送端确定预设载波中SNR80大于SNR_Ref的子载波,并将预设载波中SNR80大于SNR_Ref的子载波分配给第二接收端,将预设载波中SNR80小于或等于SNR_Ref的子载波分配给第一接收端,从而确定为第一接收端分配的子载波,以及确定为第二接收端分配的子载波。B3, the transmitting end determines a subcarrier in which the SNR80 is greater than the SNR_Ref in the preset carrier, and allocates the subcarrier in the preset carrier with the SNR80 greater than the SNR_Ref to the second receiving end, and allocates the subcarrier in the preset carrier with the SNR80 less than or equal to the SNR_Ref The first receiving end determines the subcarrier allocated for the first receiving end, and determines the subcarrier allocated for the second receiving end.
例如,结合图10所示的每个子载波对应的信噪比结果,在第19至47个子载波上,SNR80的SNR值小于SNR_Ref(也就是SNR40)的SNR值,因此将第19至47个子载波分配给第一接收端。在第47至67个子载波上,SNR80的SNR值大于SNR_Ref的SNR值,因此将第47至67个子载波分配给第二接收端。具体参阅图11所示,为发送端为第一接收端分配的子载波,以及发送端为第二接收端分配的子载波。其中,从第0个子载波到第140个子载波,子载波的对应频率逐渐增大,且任意相邻的两个子载波的中心频率的间隔相等。For example, in combination with the signal-to-noise ratio corresponding to each subcarrier shown in FIG. 10, on the 19th to 47th subcarriers, the SNR value of SNR80 is smaller than the SNR value of SNR_Ref (that is, SNR40), and thus the 19th to 47th subcarriers are used. Assigned to the first receiving end. On the 47th to 67th subcarriers, the SNR value of SNR80 is greater than the SNR value of SNR_Ref, so the 47th to 67th subcarriers are allocated to the second receiving end. Specifically, as shown in FIG. 11, the subcarrier allocated to the first receiving end by the transmitting end and the subcarrier allocated by the transmitting end to the second receiving end are used. The corresponding frequency of the subcarriers is gradually increased from the 0th subcarrier to the 140th subcarrier, and the intervals of the center frequencies of any two adjacent subcarriers are equal.
当然,发送端也可以令SNR_Ref等于第二接收端的信噪比结果SNR80,并将SNR40与SNR_Ref进行比较。然后发送端确定预设载波中SNR40大于SNR_Ref的子载波,并将预设载波中SNR40大于SNR_Ref的子载波分配给第一接收端,将预设载波中SNR40小于或等于SNR_Ref的子载波分配给第二接收端,从而确定为第一接收端分配的子载波,以及确定为第二接收端分配的子载波。Of course, the transmitting end can also make SNR_Ref equal to the signal-to-noise ratio result SNR80 of the second receiving end, and compare SNR40 with SNR_Ref. The transmitting end determines the subcarrier in the preset carrier with the SNR 40 greater than the SNR_Ref, and allocates the subcarrier in the preset carrier with the SNR 40 greater than the SNR_Ref to the first receiving end, and allocates the subcarrier in the preset carrier with the SNR 40 less than or equal to the SNR_Ref to the first carrier. The second receiving end determines the subcarrier allocated for the first receiving end, and determines the subcarrier allocated for the second receiving end.
在另一种可能的实施方式中,所述发送端获取子载波分配结果,还可以通过如下方式实现:In another possible implementation manner, the sending end obtains the subcarrier allocation result, and may also be implemented as follows:
C1,所述发送端在预设载波包括的多个子载波上分别向所述两个接收端发送探测信号,并接收所述两个接收端中每个接收端发来的基于所述探测信号确定的信噪比结果。所述信噪比结果中包括所述预设载波中每个子载波对应的信噪比值。执行步骤C2。C1, the sending end sends a sounding signal to the two receiving ends on the plurality of subcarriers included in the preset carrier, and receives, according to the detection signal, the sending signal sent by each receiving end of the two receiving ends. The signal to noise ratio results. The signal to noise ratio result includes a signal to noise ratio value corresponding to each subcarrier in the preset carrier. Go to step C2.
其中,所述探测信号可以为QPSK,也可以为BPSK,也可以为8PSK,也可以为其它信号,本申请实施例在这里不作具体限定。The detection signal may be QPSK, BPSK, or 8PSK, and may be other signals. The embodiment of the present application is not limited herein.
C2,所述发送端确定所述预设载波中的第j个子载波对应的第一信噪比值是所述第j个子载波对应的两个信噪比值中最大的。若包括所述第一信噪比值的信噪比结果是由第一接收端发来的,则将所述第j个子载波分配给所述第一接收端,若包括所述第一信噪比值的信噪比结果是由第二接收端发来的,则将所述第j个子载波分配给所述第二接收端。从而确定为第一接收端分配的子载波以及确定了为第二接收端分配的子载波。执行步骤C3。C2, the sending end determines that the first signal to noise ratio value corresponding to the jth subcarrier in the preset carrier is the largest of the two signal to noise ratio values corresponding to the jth subcarrier. If the signal to noise ratio result including the first signal to noise ratio value is sent by the first receiving end, assigning the jth subcarrier to the first receiving end, if the first signal to noise is included The signal to noise ratio result of the ratio is sent by the second receiving end, and the jth subcarrier is allocated to the second receiving end. Thereby determining the subcarriers allocated for the first receiving end and determining the subcarriers allocated for the second receiving end. Go to step C3.
C3,发送端确定为第一接收端分配的各个子载波分别对应的信噪比值的和值,以及确定为第二接收端分配的各个子载波分别对应的信噪比值的和值。执行步骤C4C3. The transmitting end determines a sum of signal to noise ratio values corresponding to respective subcarriers allocated to the first receiving end, and a sum of signal to noise ratio values corresponding to the respective subcarriers allocated to the second receiving end. Perform step C4
C4,所述发送端在确定为所述第二接收端分配的子载波对应的和值与为所述第一接收端分配的子载波对应的和值之间的差超出预设信噪比范围时,调整为所述第一接收端分配的子载波以及为所述第二接收端分配的子载波,使得为所述第二接收端分配的子载波对应的和值与为所述第一接收端分配的子载波对应的和值之间的差在预设信噪比范围内。C4. The difference between the sum value corresponding to the subcarrier allocated to the second receiving end and the sum value corresponding to the subcarrier allocated to the first receiving end exceeds a preset signal to noise ratio range. And adjusting a subcarrier allocated to the first receiving end and a subcarrier allocated to the second receiving end, so that a sum value corresponding to the subcarrier allocated to the second receiving end is the first receiving The difference between the sum values corresponding to the subcarriers allocated by the terminal is within a preset signal to noise ratio range.
可选地,所述发送端在确定为所述第二接收端分配的子载波对应的和值与为所述第一接收端分配的子载波对应的和值之间的差未超出预设信噪比范围时,不再调整为所述第二接收端分配的子载波以及为第一接收端分配的子载波。Optionally, the difference between the sum value corresponding to the subcarrier allocated to the second receiving end and the subcarrier corresponding to the first receiving end is not exceeded by the sending end. In the noise ratio range, the subcarriers allocated to the second receiving end and the subcarriers allocated to the first receiving end are no longer adjusted.
当该短距离光通信系统中还包括第三接收端时,发送端确定为第三接收端分配的子载
波的方法,具体可以参阅步骤C1至步骤C4,发送端确定为第一接收端分配的子载波的方法,本申请实施例在这里不再重复赘述。When the short-distance optical communication system further includes a third receiving end, the transmitting end determines the sub-load allocated to the third receiving end.
For the method of the wave, the method for determining the sub-carrier allocated by the first receiving end by the transmitting end may be specifically referred to in the step C1 to the step C4, and details are not repeatedly described herein.
在又一种可能的实施方式中,所述发送端获取子载波分配结果,还可以通过如下方式实现:In a further possible implementation manner, the sending end obtains the subcarrier allocation result, and may also be implemented as follows:
D1至D2,参见上述C1至C2,这里不再赘述。D1 to D2, see the above C1 to C2, and will not be described again here.
D3,所述发送端根据为第一接收端分配的子载波以及为第二接收端分配的子载波确定每个子载波对应的调制格式,并根据每个子载波对应的调制格式确定第一接收端的传输容量以及第二接收端的传输容量,若确定第一接收端的传输容量或者第二接收端的传输容量不满足系统需求时,执行步骤D4。D3, the transmitting end determines a modulation format corresponding to each subcarrier according to the subcarrier allocated for the first receiving end and the subcarrier allocated for the second receiving end, and determines the transmission of the first receiving end according to the modulation format corresponding to each subcarrier. The capacity and the transmission capacity of the second receiving end, if it is determined that the transmission capacity of the first receiving end or the transmission capacity of the second receiving end does not satisfy the system requirement, step D4 is performed.
具体的,发送端根据第一接收端的信噪比结果中第m个子载波对应的信噪比确定第m个子载波对应的调制格式,其中,第m个子载波为发送端为第一接收端分配的子载波中的任意一个,从而发送端确定为第一接收端分配的子载波中每一个子载波对应的调制格式,然后根据为第一接收端分配的各个子载波的调制格式确定第一接收端的传输容量。具体根据调制格式确定传输容量的方式可以参见现有技术提供的确定方案,本申请实施例不再赘述。Specifically, the transmitting end determines, according to a signal to noise ratio corresponding to the mth subcarrier in the signal to noise ratio result of the first receiving end, a modulation format corresponding to the mth subcarrier, where the mth subcarrier is allocated by the transmitting end to the first receiving end. Any one of the subcarriers, so that the transmitting end determines the modulation format corresponding to each of the subcarriers allocated by the first receiving end, and then determines the first receiving end according to the modulation format of each subcarrier allocated for the first receiving end. Transmission capacity. For the manner of determining the transmission capacity according to the modulation format, refer to the determination scheme provided by the prior art, which is not repeatedly described in the embodiment of the present application.
比如:参见图11所示的子载波分配结果,第19至47个子载波、第67至第95个子载波分配给第一接收端,然后根据第19个子载波对应的信噪比值确定第19个子载波对应的调制格式,并基于相同的方法确定第20至47个子载波、第67至第95个子载波中每个子载波对应的调制格式,根据确定的第19至47个子载波、第67至第95个子载波中每个子载波对应的调制格式确定第一接收端的传输容量。For example, referring to the subcarrier allocation result shown in FIG. 11, the 19th to 47th subcarriers and the 67th to 95th subcarriers are allocated to the first receiving end, and then the 19th subunit is determined according to the signal to noise ratio value corresponding to the 19th subcarrier. a modulation format corresponding to the carrier, and determining a modulation format corresponding to each of the 20th to 47th subcarriers and the 67th to 95th subcarriers based on the same method, according to the determined 19th to 47th subcarriers, 67th to 95th The modulation format corresponding to each of the subcarriers determines the transmission capacity of the first receiving end.
发送端对第二接收端的传输容量的确定方法具体可以参阅对第一接收端的传输容量的确定方法,本申请实施例不再赘述。For the method for determining the transmission capacity of the second receiving end, refer to the method for determining the transmission capacity of the first receiving end, which is not described in the embodiment of the present application.
D4,发送端根据系统需求调整分配给第一接收端的子载波以及分配给第二接收端的子载波,使得经过调整后第一接收端的传输容量满足系统需求,以及经过调整后第二接收端的传输容量满足系统需求。可选的,在执行完步骤D4之后,执行步骤D5。D4, the transmitting end adjusts the subcarrier allocated to the first receiving end and the subcarrier allocated to the second receiving end according to system requirements, so that the adjusted transmission capacity of the first receiving end satisfies the system requirement and the adjusted transmission capacity of the second receiving end Meet system requirements. Optionally, after step D4 is performed, step D5 is performed.
D5,发送端确定经过调整后第一接收端的传输容量与经过调整后第二接收端的传输容量之间的差超出预设传输容量范围时,调整为第一接收端分配的子载波以及为第二接收端分配的子载波,使得经过调整后第一接收端的传输容量与经过调整后第二接收端的传输容量之间的差在预设传输容量范围内。D5, the transmitting end determines that the adjusted difference between the transmission capacity of the first receiving end and the adjusted transmission capacity of the second receiving end exceeds the preset transmission capacity range, and adjusts to the subcarrier allocated by the first receiving end and is the second The subcarriers allocated by the receiving end are such that the difference between the adjusted transmission capacity of the first receiving end and the adjusted transmission capacity of the second receiving end is within a preset transmission capacity range.
可选地,发送端在确定经过调整后第一接收端的传输容量与经过调整后第二接收端的传输容量之间的差在预设传输容量范围内时,不再调整为所述第二接收端分配的子载波以及为第一接收端分配的子载波。Optionally, the transmitting end does not adjust to the second receiving end when determining that the difference between the adjusted transmission capacity of the first receiving end and the adjusted transmission capacity of the second receiving end is within a preset transmission capacity range. The allocated subcarriers and the subcarriers allocated for the first receiving end.
当该短距离光通信系统中还包括第三接收端时,发送端确定为第三接收端分配的子载波的方法,具体可以参阅步骤D1至步骤D5,发送端确定为第一接收端分配的子载波的方法,本申请实施例在这里不再重复赘述。When the short-distance optical communication system further includes a third receiving end, the transmitting end determines the method for the sub-carrier allocated by the third receiving end. For details, refer to step D1 to step D5, where the transmitting end determines that the first receiving end is allocated. The method of subcarriers is not repeated here.
本申请实施例中通过发送端根据预设信噪比范围调整为第一接收端分配的子载波以及为第二接收端分配的子载波,使得为第一接收端的子载波对应的和值以及为第二接收端的子载波对应的和值均满足系统需求,并且通过调整为第一接收端分配的子载波以及为第二接收端分配的子载波,使得为所述第一接收端分配的子载波对应的和值与为第二接收端分配的子载波对应的和值之间的差在预设信噪比范围内。另外,由于为所述第一接收端分
配的子载波的信噪比的和值与通过为所述第一接收端分配的子载波确定的传输容量成正比。预设信噪比范围基于预设传输容量范围确定,或者预设传输容量范围基于预设信噪比范围确定。从而第一接收端的传输容量与第二接收端的传输容量之间的差在预设传输容量范围内;由于信噪比与误码率成反比,从而第一接收端转换后的电信号的误码率与第二接收端转换后的电信号的误码率之间的差在预设误码率范围内。因此,通过上述方式提供的获取子载波分配结果的方式,在基于获取到的不同接收端发送的每个子载波对应的信噪比来为每个接收端分配子载波后,根据预设信噪比范围或者预设传输容量范围调整为每个接收端分配的子载波,能够提高系统性能,比如传输容量。In the embodiment of the present application, the transmitting end allocates the subcarrier allocated to the first receiving end and the subcarrier allocated to the second receiving end according to the preset signal to noise ratio range, so that the sum value corresponding to the subcarrier of the first receiving end is The sum value corresponding to the subcarriers of the second receiving end meets the system requirements, and the subcarriers allocated to the first receiving end and the subcarriers allocated to the second receiving end are adjusted so that the subcarriers allocated to the first receiving end The difference between the corresponding sum value and the sum value corresponding to the subcarrier allocated for the second receiving end is within a preset signal to noise ratio range. In addition, since the first receiving end is divided
The sum of the signal to noise ratios of the assigned subcarriers is proportional to the transmission capacity determined by the subcarriers allocated for the first receiving end. The preset signal to noise ratio range is determined based on the preset transmission capacity range, or the preset transmission capacity range is determined based on the preset signal to noise ratio range. Therefore, the difference between the transmission capacity of the first receiving end and the transmission capacity of the second receiving end is within a preset transmission capacity range; since the signal to noise ratio is inversely proportional to the error rate, the error of the electrical signal after the first receiving end is converted. The difference between the rate and the error rate of the electrical signal converted by the second receiving end is within a preset error rate range. Therefore, after the subcarrier allocation result is obtained by the above manner, the subcarriers are allocated to each receiving end according to the SNR corresponding to each subcarrier transmitted by the different receiving end, according to the preset signal to noise ratio. The range or preset transmission capacity range is adjusted to the subcarriers allocated to each receiver, which can improve system performance, such as transmission capacity.
可选的,一方面,在所述发送端根据通信距离与色散补偿值的对应关系,针对分配给不同通信距离对应的接收端的子载波进行色散补偿之后(也就是,发送端针对分配给第一接收端的子载波以及针对分配给第二接收端的子载波分别进行色散补偿之后),所述发送端可以将信号生成模块生成的时域信号进行傅里叶变换。之后,所述发送端将经过傅里叶变换后的频域信号映射到为所述第一接收端分配的且经过色散补偿的子载波上,然后针对映射后的信号进行反傅里叶变换后发送给第一接收端。并将经过傅里叶变换后的频域信号映射到为所述第二接收端分配的且经过色散补偿的子载波上,然后针对映射后的信号进行反傅里叶变换后发送给第二接收端。Optionally, on the one hand, after the transmission end allocates dispersion compensation to the subcarriers allocated to the receiving end corresponding to different communication distances according to the correspondence between the communication distance and the dispersion compensation value (that is, the transmitting end is allocated to the first After the subcarriers at the receiving end and the subcarriers allocated to the second receiving end are respectively subjected to dispersion compensation, the transmitting end may perform Fourier transform on the time domain signal generated by the signal generating module. Afterwards, the transmitting end maps the Fourier-transformed frequency domain signal to the dispersion-compensated subcarrier allocated to the first receiving end, and then performs inverse Fourier transform on the mapped signal. Send to the first receiver. And transforming the Fourier-transformed frequency domain signal onto the dispersion-dispensed subcarrier allocated to the second receiving end, and then performing inverse Fourier transform on the mapped signal and transmitting to the second receiving end.
当该短距离光通信系统中还包括第三接收端时,发送端在针对第三接收端分配的子载波进行色散补偿之后,所述发送端将经过傅里叶变换后的频域信号映射到为所述第三接收端分配的且经过色散补偿的子载波上,然后针对映射后的信号进行反傅里叶变换后发送给第三接收端。When the short-distance optical communication system further includes a third receiving end, after the transmitting end performs dispersion compensation on the sub-carrier allocated for the third receiving end, the transmitting end maps the Fourier-transformed frequency domain signal to the transmitting end. The dispersion-compensated subcarriers allocated to the third receiving end are then subjected to inverse Fourier transform for the mapped signals and then sent to the third receiving end.
另一方面,发送端也可以在根据通信距离与色散补偿值的对应关系,针对分配给不同通信距离对应的接收端的子载波进行色散补偿之前(也就是,发送端针对分配给第一接收端的子载波以及针对分配给第二接收端的子载波分别进行色散补偿之前),将信号生成模块生成的时域信号进行傅里叶变换。On the other hand, the transmitting end may also perform the dispersion compensation on the subcarriers allocated to the receiving end corresponding to different communication distances according to the correspondence relationship between the communication distance and the dispersion compensation value (that is, the transmitting end is for the child allocated to the first receiving end. The time domain signal generated by the signal generation module is subjected to Fourier transform before the carrier and the subcarriers allocated to the second receiving end are respectively subjected to dispersion compensation.
然后将发送给第一接收端的经过傅里叶变换后的信号映射到为所述第一接收端分配的子载波上。之后针对映射子载波后的信号补偿第一接收端与发送端之间的通信距离所对应的色散补偿值(相当于针对分配给第一接收端的子载波补偿第一接收端与发送端之间的通信距离所对应的色散补偿值)。最后针对补偿后的信号进行反傅里叶变换后发送给所述第一接收端。The Fourier transformed signal transmitted to the first receiving end is then mapped onto the subcarriers allocated for the first receiving end. Then, the signal after mapping the subcarriers is compensated for the dispersion compensation value corresponding to the communication distance between the first receiving end and the transmitting end (corresponding to the compensation between the first receiving end and the transmitting end for the subcarrier allocated to the first receiving end) The dispersion compensation value corresponding to the communication distance). Finally, the compensated signal is subjected to inverse Fourier transform and then sent to the first receiving end.
并将发送给第二接收端的经过傅里叶变换后的信号映射到为所述第二接收端分配的子载波上。之后针对映射子载波后的信号补偿第二接收端与发送端之间的通信距离所对应的色散补偿值(相当于针对分配给第二接收端的子载波补偿第二接收端与发送端之间的通信距离所对应的色散补偿值)。最后针对补偿后的信号进行反傅里叶变换后发送给所述第二接收端。And translating the Fourier transformed signal sent to the second receiving end onto the subcarrier allocated for the second receiving end. Then, for the signal after mapping the subcarriers, the dispersion compensation value corresponding to the communication distance between the second receiving end and the transmitting end is compensated (corresponding to the compensation between the second receiving end and the transmitting end for the subcarrier allocated to the second receiving end) The dispersion compensation value corresponding to the communication distance). Finally, the compensated signal is subjected to inverse Fourier transform and then sent to the second receiving end.
下面以第一接收端为例,对发送端将经过反傅里叶变换后的信号发送给第一接收端的过程进行具体描述。本申请实施例中,发送端将经过反傅里叶变换后的信号发送给第二接收端的过程,与发送端将经过反傅里叶变换后的信号发送给第一接收端的过程相同,因此发送端将经过反傅里叶变换后的信号发送给第二接收端的过程,具体可以参阅发送端将经过反傅里叶变换后的信号发送给第一接收端的过程,本申请实施例在这里不再重复赘述。The following takes the first receiving end as an example, and specifically describes a process in which the transmitting end sends the signal after the inverse Fourier transform to the first receiving end. In the embodiment of the present application, the process in which the transmitting end sends the signal after the inverse Fourier transform to the second receiving end is the same as the process in which the transmitting end sends the signal after the inverse Fourier transform to the first receiving end, so The process of transmitting the signal after the inverse Fourier transform to the second receiving end is performed by the transmitting end, and the process of transmitting the signal after the inverse Fourier transform to the first receiving end by the transmitting end, the embodiment of the present application is no longer here. Repeat the details.
具体的,发送端将经过反傅里叶变换后的信号发送给第一接收端,可以通过如下方式
实现:Specifically, the sending end sends the signal after the inverse Fourier transform to the first receiving end, which can be adopted as follows
achieve:
E1,发送端在经过反傅里叶变换后的信号上加载循环前缀(英文:cyclic prefix,简称:CP)。E1, the transmitting end loads a cyclic prefix (English: cyclic prefix, referred to as CP) on the signal after the inverse Fourier transform.
本申请实施例通过在经过反傅里叶变换后的信号上加载循环前缀,有助于提高短距离光通信系统的抗色散性能。The embodiment of the present application helps to improve the anti-dispersion performance of the short-distance optical communication system by loading the cyclic prefix on the signal after the inverse Fourier transform.
E2,发送端通过DAC将加载了CP的信号转换成模拟信号,并确定该模拟信号的实部I以及该模拟信号的虚部Q。E2, the transmitting end converts the signal loaded with the CP into an analog signal through the DAC, and determines the real part I of the analog signal and the imaginary part Q of the analog signal.
E3,发送端将模拟信号的实部I分别经过电域驱动器和衰减器进行处理,且将模拟信号的虚部Q分别经过电域驱动器和衰减器进行处理。E3, the transmitting end processes the real part I of the analog signal through the electric domain driver and the attenuator respectively, and processes the imaginary part Q of the analog signal through the electric domain driver and the attenuator respectively.
E4,发送端将该模拟信号经过处理的实部I以及该模拟信号经过处理的虚部Q分别输入到图7所示的DDMZM中,从而将该模拟信号转换成光信号,然后将转换得到的光信号发送给第一接收端。E4, the transmitting end outputs the processed real part I of the analog signal and the processed imaginary part Q of the analog signal to the DDMZM shown in FIG. 7, respectively, thereby converting the analog signal into an optical signal, and then converting the converted signal. The optical signal is sent to the first receiving end.
具体的,发送端可以将该模拟信号经过处理的实部I输入到DDMZM的上臂PM的RF端口,将该模拟信号经过处理的虚部Q输入到DDMZM的下臂PM的RF端口,从而驱动DDMZM的两个PM进行工作。所述DDMZM的光输入口接收到一路连续光(英文:continuous wave,简称:CW),所述DDMZM的两个PM在模拟信号的驱动下,将接收到的该连续光转换成该模拟信号对应的光信号。Specifically, the transmitting end can input the processed real part I of the analog signal to the RF port of the upper arm PM of the DDMZM, and input the processed imaginary part Q to the RF port of the lower arm PM of the DDMZM, thereby driving the DDMZM. The two PMs work. The optical input port of the DDMZM receives a continuous light (English: continuous wave, referred to as CW), and the two PMs of the DDMZM convert the received continuous light into the analog signal under the driving of the analog signal. Light signal.
当所述短距离光通信系统中还包括第三接收端时,发送端将经过反傅里叶变换后的信号发送给第三接收端的过程,具体可以参阅发送端将经过反傅里叶变换后的信号发送给第一接收端的过程,本申请实施例在这里不再重复赘述。When the short-distance optical communication system further includes a third receiving end, the transmitting end sends the signal after the inverse Fourier transform to the third receiving end, and specifically, the transmitting end will undergo the inverse Fourier transform. The process of sending the signal to the first receiving end is not repeated here.
下面以第一接收端为例,对第一接收端对接收到的光信号进行处理的过程进行具体描述。本申请实施例中,第一接收端对接收到的光信号进行处理的过程,与第二接收端对接收到的光信号进行处理的过程相同,因此第二接收端对接收到的光信号进行处理的过程,具体可以参阅第一接收端对接收到的光信号进行处理的过程,本申请实施例在这里不再重复赘述。The following describes the process of processing the received optical signal by the first receiving end by taking the first receiving end as an example. In the embodiment of the present application, the process of processing the received optical signal by the first receiving end is the same as the process of processing the received optical signal by the second receiving end, so the second receiving end performs the received optical signal. For the process of processing, refer to the process of processing the received optical signal by the first receiving end, and details are not repeatedly described herein.
具体的,第一接收端对接收到的光信号进行处理,可以通过如下方式实现:Specifically, the first receiving end processes the received optical signal, which can be implemented as follows:
F1,第一接收端在接受到该光信号后,将接收到的光信号通过滤波器滤除ASE噪声。F1. After receiving the optical signal, the first receiving end filters the received optical signal through the filter to filter out the ASE noise.
F2,第一接收端通过ROSA将滤除了ASE噪声的光信号转换成电信号。F2. The first receiving end converts the optical signal filtering the ASE noise into an electrical signal through the ROSA.
F3,第一接收端通过OSC将转换得到的电信号转换成数字信号。F3. The first receiving end converts the converted electrical signal into a digital signal through the OSC.
F4,第一接收端将转换得到的数字信号通过数DSP进行处理。F4, the first receiving end processes the converted digital signal through the digital DSP.
当所述短距离光通信系统中还包括第三接收端时,第三接收端对接收到的光信号进行处理的过程,具体可以参阅第一接收端对接收到的光信号进行处理的过程,本申请实施例在这里不再重复赘述。When the short-distance optical communication system further includes a third receiving end, the third receiving end processes the received optical signal, and specifically, the process of processing the received optical signal by the first receiving end, The embodiments of the present application are not repeated here.
本申请实施例中通过发送端获取子载波分配结果,所述子载波分配结果中包括基于所述发送端与所述至少两个接收端之间传输信号的信噪比结果为所述至少两个接收端分配的子载波;然后根据通信距离与色散补偿值的对应关系,针对分配给不同通信距离对应的接收端的子载波进行色散补偿。由于发送端与不同的接收端之间的通信距离不同,因此产生的色散不同,从而需要的色散补偿值不同,相比于现有技术中色散补偿方法对于不同的传输距离补偿相同的色散值,本申请实施例中针对每一个传输距离补偿该传输距离对应的色散值,有效的缓解了一个发送端与多个接收端进行通信的应用场景中光纤色散导致的衰
落现象,有助于提高光通信系统的性能。并且,所述发送端基于与所述至少两个接收端之间传输信号的信噪比结果为所述至少两个接收端分配的子载波时,根据预设信噪比范围调整为每个接收端分配的子载波,使得每个接收端分配的子载波对应的和值均满足系统需求。In the embodiment of the present application, the subcarrier allocation result is obtained by the sending end, where the subcarrier allocation result includes a signal to noise ratio result based on the transmitted signal between the transmitting end and the at least two receiving ends, and the result is at least two The subcarriers allocated by the receiving end are then subjected to dispersion compensation for the subcarriers allocated to the receiving ends corresponding to different communication distances according to the correspondence between the communication distance and the dispersion compensation value. Since the communication distance between the transmitting end and the different receiving end is different, the generated dispersion is different, and thus the required dispersion compensation value is different. Compared with the prior art dispersion compensation method, the same dispersion value is compensated for different transmission distances, In the embodiment of the present application, the chromatic dispersion value corresponding to the transmission distance is compensated for each transmission distance, which effectively alleviates the fading caused by fiber dispersion in an application scenario in which a transmitting end communicates with multiple receiving ends.
Falling phenomenon helps to improve the performance of optical communication systems. And, when the transmitting end is a subcarrier allocated to the at least two receiving ends based on a signal to noise ratio result of a signal transmitted between the at least two receiving ends, adjusting, according to a preset signal to noise ratio range, each receiving The subcarriers allocated by the terminal are such that the sum values corresponding to the subcarriers allocated by each receiver satisfy the system requirements.
参阅图12所示,为发送端分别通过现有方案一、现有方案二以及本申请实施例提供的色散补偿方法解决光纤色散问题时系统容量(也就是系统中各接收端的传输容量之和)的对比图。其中,发送端通过现有方案一解决光纤色散问题时,发送端达到的系统容量为44Gb/s;发送端通过现有方案二解决光纤色散问题时,发送端达到的系统容量为47Gb/s;发送端通过本申请实施例提供的色散补偿方法解决光纤色散问题时,发送端达到的系统容量为60Gb/s。可以看出,本申请实施例提供的色散补偿方法在一定程度上提高了系统容量,从而提高了系统性能。As shown in FIG. 12, the system capacity (that is, the sum of the transmission capacities of the receiving ends in the system) is solved by the dispersion compensation method provided by the existing scheme 1 and the existing scheme 2 and the embodiment of the present application. Comparison chart. Wherein, when the transmitting end solves the fiber dispersion problem through the existing solution 1, the system capacity reached by the transmitting end is 44 Gb/s; when the transmitting end solves the fiber dispersion problem through the existing solution 2, the system capacity reached by the transmitting end is 47 Gb/s; When the transmitting end solves the fiber dispersion problem by using the dispersion compensation method provided by the embodiment of the present application, the system capacity reached by the transmitting end is 60 Gb/s. It can be seen that the dispersion compensation method provided by the embodiment of the present application improves the system capacity to a certain extent, thereby improving system performance.
参阅图13所示,为通过现有技术中点到点色散补偿方法进行色散补偿后和通过本申请实施例提供的色散补偿方法进行色散补偿后接收端对应的误码率-信噪比曲线的对比图,其中,“56Gb/s 80km”曲线为在系统容量为56Gb/s的情况下,采用现有技术中点到点色散补偿方法对通信距离为80km的接收端进行色散补偿后的误码率-信噪比曲线;“56Gb/s40km”曲线为在系统容量为56Gb/s的情况下,采用现有技术中点到点色散补偿方法对通信距离为40km的接收端进行色散补偿后的误码率-信噪比曲线;“28Gb/s 80km”曲线和“28Gb/s 40km”曲线分别为在系统容量为56Gb/s的情况下,采用本申请实施例提供的色散补偿方法对通信距离为80km的接收端进行色散补偿后的误码率-信噪比曲线,和对通信距离为40km的接收端进行色散补偿后的误码率-信噪比曲线。从图13中可以看出,在信噪比值相同时,通过现有技术中点到点色散补偿方法进行色散补偿后的误码率大于通过本申请实施例提供的色散补偿方法进行色散补偿后的误码率,如图13中,“56Gb/s 80km”曲线中信噪比值为23所对应的误码率以及“56Gb/s 40km”曲线中信噪比值为23所对应的误码率均高于“28Gb/s 40km”曲线中信噪比值为23所对应的误码率以及“28Gb/s 80km”曲线中信噪比值为23所对应的误码率,因此本申请实施例提供的色散补偿方法,相比于传统的点到点色散补偿方法,降低了误码率,提高了系统性能。Referring to FIG. 13 , the bit error rate-signal-to-noise ratio curve corresponding to the receiving end after dispersion compensation by the dispersion compensation method provided by the embodiment of the present application is performed after the dispersion compensation is performed by the prior art point-to-point dispersion compensation method. In the comparison chart, the “56Gb/s 80km” curve is the error code after the dispersion compensation of the receiving end with the communication distance of 80km by using the point-to-point dispersion compensation method in the prior art with the system capacity of 56Gb/s. Rate-signal-to-noise ratio curve; the “56Gb/s40km” curve is the error after dispersion compensation for the receiver with a communication distance of 40km using the point-to-point dispersion compensation method in the prior art with a system capacity of 56Gb/s. The rate-signal-to-noise ratio curve; the "28Gb/s 80km" curve and the "28Gb/s 40km" curve are respectively used in the case where the system capacity is 56Gb/s, and the dispersion compensation method provided by the embodiment of the present application is used for the communication distance. The bit error rate-signal-to-noise ratio curve after dispersion compensation is performed at the receiving end of 80 km, and the bit error rate-signal-to-noise ratio curve after dispersion compensation is performed on the receiving end with a communication distance of 40 km. It can be seen from FIG. 13 that, when the signal-to-noise ratio is the same, the error rate after the dispersion compensation by the point-to-point dispersion compensation method in the prior art is greater than the dispersion compensation method provided by the embodiment of the present application. The bit error rate, as shown in Figure 13, the "56Gb/s 80km" curve has a signal-to-noise ratio of 23 corresponding to the bit error rate and the "56Gb/s 40km" curve has a signal-to-noise ratio of 23 corresponding to the bit error rate. The rate is higher than the error rate corresponding to the signal-to-noise ratio of 23 in the "28Gb/s 40km" curve and the error rate corresponding to the signal-to-noise ratio of 23 in the "28Gb/s 80km" curve. Therefore, the present application implements The dispersion compensation method provided by the example reduces the bit error rate and improves the system performance compared to the conventional point-to-point dispersion compensation method.
基于与方法实施例的同一发明构思,本发明实施例提供一种色散补偿装置,所述装置可以应用于发送端的色散补偿模块,或者当该色散补偿装置以软件形式实现时该色散补偿装置可以作为发送端的色散补偿模块。所述发送端与至少两个接收端进行通信,且所述发送端与所述至少两个接收端之间的通信距离不同,具体用于实现图1至图11所述的实施例描述的方法,该装置的结构如图14所示,包括分配单元1401以及补偿单元1402,其中:Based on the same inventive concept as the method embodiment, the embodiment of the present invention provides a dispersion compensation device, which can be applied to a dispersion compensation module at a transmitting end, or can be used as a dispersion compensation device when the dispersion compensation device is implemented in software. Dispersion compensation module at the transmitting end. The transmitting end communicates with the at least two receiving ends, and the communication distance between the sending end and the at least two receiving ends is different, specifically for implementing the method described in the embodiments described in FIG. 1 to FIG. The structure of the device is as shown in FIG. 14, and includes a distribution unit 1401 and a compensation unit 1402, wherein:
分配单元1401,用于获取子载波分配结果,所述子载波分配结果中包括基于所述发送端与所述至少两个接收端之间传输信号的信噪比结果为所述至少两个接收端分配的子载波。The allocating unit 1401 is configured to obtain a subcarrier allocation result, where the subcarrier allocation result includes a signal to noise ratio result based on a signal transmitted between the transmitting end and the at least two receiving ends, where the at least two receiving ends are Allocated subcarriers.
补偿单元1402,用于根据通信距离与色散补偿值的对应关系,针对所述分配单元1401获取的子载波分配结果中包括的分配给不同通信距离对应的接收端的子载波进行色散补偿。The compensation unit 1402 is configured to perform dispersion compensation on the subcarriers allocated to the receiving end corresponding to different communication distances included in the subcarrier allocation result acquired by the allocating unit 1401 according to the correspondence between the communication distance and the dispersion compensation value.
可选地,所述分配单元1401,具体用于接收所述至少两个接收端中每个接收端发送的所述每个接收端与所述发送端之间传输信号的信噪比结果,并基于所述至少两个接收端分别发来的信噪比结果为所述至少两个接收端分配子载波。
Optionally, the allocating unit 1401 is configured to receive a signal to noise ratio result of a signal transmitted between each of the receiving ends and the sending end sent by each receiving end of the at least two receiving ends, and And assigning a subcarrier to the at least two receiving ends based on a signal to noise ratio result respectively sent by the at least two receiving ends.
可选地,所述分配单元1401,具体用于在预设载波包括的多个子载波上分别向所述至少两个接收端发送探测信号,并接收所述至少两个接收端中每个接收端发来的基于所述探测信号确定的信噪比结果;所述信噪比结果中包括所述预设载波中每个子载波对应的信噪比值。然后确定所述预设载波中的第i个子载波对应的第一信噪比值是所述第i个子载波对应的多个信噪比值中最大的;其中,包括所述第一信噪比值的信噪比结果是由第一接收端发来的;所述i取遍不大于所述预设载波包括的子载波数量的正整数。之后将所述第i个子载波分配给所述第一接收端,所述第一接收端为至少两个接收端中的任意一个。Optionally, the allocating unit 1401 is configured to send a sounding signal to the at least two receiving ends on the plurality of subcarriers included in the preset carrier, and receive each of the at least two receiving ends. And a signal to noise ratio result determined based on the sounding signal; the signal to noise ratio result includes a signal to noise ratio value corresponding to each of the preset carriers. And determining that the first signal to noise ratio value corresponding to the i th subcarrier in the preset carrier is the largest one of the plurality of signal to noise ratio values corresponding to the i th subcarrier; wherein the first signal to noise ratio is included The signal to noise ratio result of the value is sent by the first receiving end; the i is taken over a positive integer not greater than the number of subcarriers included in the preset carrier. The ith subcarrier is then allocated to the first receiving end, and the first receiving end is any one of at least two receiving ends.
可选地,所述分配单元1401,具体用于在预设载波包括的多个子载波上分别向所述至少两个接收端发送探测信号,并接收所述至少两个接收端中每个接收端发来的基于所述探测信号确定的信噪比结果;所述信噪比结果中包括所述预设载波中每个子载波对应的信噪比值。然后确定所述预设载波中的第j个子载波对应的第二信噪比值是所述第j个子载波对应的多个信噪比值中最大的;其中,包括所述第二信噪比值的信噪比结果是由第二接收端发来的;所述j取遍不大于所述预设载波包括的子载波数量的正整数,并将所述第j个子载波分配给所述第二接收端。之后确定为所述第二接收端分配的各个子载波分别对应的信噪比值的和值,以及确定为第三接收端分配的各个子载波分别对应的信噪比值的和值,所述第二接收端与所述第三接收端为所述至少两个接收端中的任意两个接收端。并在确定为所述第二接收端分配的子载波对应的和值与为所述第三接收端分配的子载波对应的和值之间的差超出预设范围时,调整为所述第二接收端分配的子载波以及为所述第三接收端分配的子载波,使得为所述第二接收端分配的子载波对应的和值与为所述第三接收端分配的子载波对应的和值之间的差在预设范围内。Optionally, the allocating unit 1401 is configured to send a sounding signal to the at least two receiving ends on the plurality of subcarriers included in the preset carrier, and receive each of the at least two receiving ends. And a signal to noise ratio result determined based on the sounding signal; the signal to noise ratio result includes a signal to noise ratio value corresponding to each of the preset carriers. And determining, by the second signal-to-noise ratio value corresponding to the j-th sub-carrier, the second signal-to-noise ratio corresponding to the j-th sub-carrier; wherein the second signal-to-noise ratio is included The signal-to-noise ratio result of the value is sent by the second receiving end; the j takes a positive integer not greater than the number of subcarriers included in the preset carrier, and allocates the jth subcarrier to the first Two receiving ends. And determining a sum of signal to noise ratio values corresponding to the respective subcarriers allocated to the second receiving end, and determining a sum of signal to noise ratio values corresponding to the respective subcarriers allocated to the third receiving end, The second receiving end and the third receiving end are any two of the at least two receiving ends. And adjusting to the second when the difference between the sum value corresponding to the subcarrier allocated to the second receiving end and the sum value corresponding to the subcarrier allocated to the third receiving end exceeds a preset range a subcarrier allocated by the receiving end and a subcarrier allocated to the third receiving end, such that a sum value corresponding to the subcarrier allocated to the second receiving end and a subcarrier corresponding to the third receiving end are allocated The difference between the values is within the preset range.
可选的,所述装置还可以包括傅里叶变换单元1403以及反傅里叶变换单元1404。Optionally, the apparatus may further include a Fourier transform unit 1403 and an inverse Fourier transform unit 1404.
所述傅里叶变换单元1403,用于在所述补偿单元1402根据通信距离与色散补偿值的对应关系,针对分配给不同通信距离对应的接收端的子载波进行色散补偿之后,分别将发送给所述至少两个接收端中每个接收端的信号进行傅里叶变换。所述补偿单元1402,还用于将发送给第四接收端的经过所述傅里叶变换单元1403变换后的信号映射到为所述第四接收端分配的且经过色散补偿的子载波上,所述第四接收端为所述至少两个接收端中的任意一个。所述反傅里叶变换单元1404,用于针对所述补偿单元1402映射后的信号进行反傅里叶变换后发送给所述第四接收端。The Fourier transform unit 1403 is configured to: after the compensation unit 1402 performs dispersion compensation on the subcarriers allocated to the receiving end corresponding to different communication distances according to the correspondence between the communication distance and the dispersion compensation value, respectively A signal of each of the at least two receiving ends is subjected to Fourier transform. The compensating unit 1402 is further configured to map, by using the Fourier transform unit 1403, the signal that is sent to the fourth receiving end to the sub-carrier that is allocated to the fourth receiving end and is subjected to dispersion compensation. The fourth receiving end is any one of the at least two receiving ends. The inverse Fourier transform unit 1404 is configured to perform inverse Fourier transform on the signal after the mapping by the compensation unit 1402, and then send the signal to the fourth receiving end.
或者,所述傅里叶变换单元1403,用于在所述补偿单元1402根据通信距离与色散补偿值的对应关系,针对分配给不同通信距离对应的接收端的子载波进行色散补偿之前,分别将发送给所述至少两个接收端中每个接收端的信号进行傅里叶变换;所述分配单元1401,还用于将发送给第四接收端的经过所述傅里叶变换单元1403变换后的信号映射到为所述第四接收端分配的子载波上,所述第四接收端为所述至少两个接收端中的任意一个;所述补偿单元1402,在根据通信距离与色散补偿值的对应关系,针对所述分配单元1401获取的子载波分配结果中包括的分配给不同通信距离对应的接收端的子载波进行色散补偿时,具体用于根据通信距离与色散补偿值的对应关系,针对所述分配单元1401映射子载波后的信号进行色散补偿;所述反傅里叶变换单元1404,用于针对所述补偿单元1402补偿后的信号进行反傅里叶变换后发送给所述第四接收端。Alternatively, the Fourier transform unit 1403 is configured to send, respectively, the compensation unit 1402 according to the correspondence between the communication distance and the dispersion compensation value, before performing dispersion compensation on the subcarriers allocated to the receiving end corresponding to different communication distances. Performing a Fourier transform on the signal of each of the at least two receiving ends; the allocating unit 1401 is further configured to map the signal transformed by the Fourier transform unit 1403 to the fourth receiving end To the subcarrier allocated for the fourth receiving end, the fourth receiving end is any one of the at least two receiving ends; the compensating unit 1402 is in accordance with the correspondence between the communication distance and the dispersion compensation value And performing the chromatic dispersion compensation on the subcarriers that are allocated to the receiving end corresponding to the different communication distances, and the specificity is used for the allocation according to the correspondence between the communication distance and the dispersion compensation value. The unit 1401 maps the signals after the subcarriers to perform dispersion compensation; the inverse Fourier transform unit 1404 is configured to The signal compensation element 1402 is sent to the inverse Fourier transform of the fourth receiver.
本申请实施例中对模块的划分是示意性的,仅仅为一种逻辑功能划分,实际实现时可以有另外的划分方式,另外,在本申请各个实施例中的各功能模块可以集成在一个处理器
中,也可以是单独物理存在,也可以两个或两个以上模块集成在一个模块中。上述集成的模块既可以采用硬件的形式实现,也可以采用软件功能模块的形式实现。The division of the modules in the embodiment of the present application is schematic, and is only a logical function division. In actual implementation, there may be another division manner. In addition, each functional module in each embodiment of the present application may be integrated into one processing. Device
In addition, it may be physically present alone, or two or more modules may be integrated into one module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules.
其中,集成的模块既可以采用硬件的形式实现时,如图15所示,可以包括处理器1501、存储器1502以及通信接口1503。分配单元1401、补偿单元1402、傅里叶变换单元1403以及反傅里叶变换单元1404对应的实体硬件可以是处理器1501。处理器1501,可以是一个中央处理单元(英文:central processing unit,简称CPU),或者为数字处理单元等等。处理器1501通过通信接口1503收发数据。存储器1502,用于存储处理器1501执行的程序。Wherein, when the integrated module can be implemented in the form of hardware, as shown in FIG. 15, the processor 1501, the memory 1502, and the communication interface 1503 can be included. The physical hardware corresponding to the allocation unit 1401, the compensation unit 1402, the Fourier transform unit 1403, and the inverse Fourier transform unit 1404 may be the processor 1501. The processor 1501 can be a central processing unit (English: central processing unit, CPU for short), or a digital processing unit or the like. The processor 1501 transmits and receives data through the communication interface 1503. The memory 1502 is configured to store a program executed by the processor 1501.
本申请实施例中不限定上述处理器1501、存储器1502以及通信接口1503之间的具体连接介质。本申请实施例在图15中以存储器1502、处理器1501以及通信接口1503之间通过总线1504连接,总线在图15中以粗线表示,其它部件之间的连接方式,仅是进行示意性说明,并不引以为限。所述总线可以分为地址总线、数据总线、控制总线等。为便于表示,图15中仅用一条粗线表示,但并不表示仅有一根总线或一种类型的总线。The specific connection medium between the processor 1501, the memory 1502, and the communication interface 1503 is not limited in the embodiment of the present application. In the embodiment of the present application, the memory 1502, the processor 1501, and the communication interface 1503 are connected by a bus 1504 in FIG. 15, and the bus is indicated by a thick line in FIG. 15, and the connection manner between other components is only schematically illustrated. , not limited to. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 15, but it does not mean that there is only one bus or one type of bus.
存储器1502可以是易失性存储器(英文:volatile memory),例如随机存取存储器(英文:random-access memory,缩写:RAM);存储器1502也可以是非易失性存储器(英文:non-volatile memory),例如只读存储器(英文:read-only memory,缩写:ROM),快闪存储器(英文:flash memory),硬盘(英文:hard disk drive,缩写:HDD)或固态硬盘(英文:solid-state drive,缩写:SSD)、或者存储器1502是能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质,但不限于此。存储器1502可以是上述存储器的组合。The memory 1502 may be a volatile memory (English: volatile memory), such as a random access memory (English: random-access memory, abbreviation: RAM); the memory 1502 may also be a non-volatile memory (English: non-volatile memory) For example, read-only memory (English: read-only memory, abbreviation: ROM), flash memory (English: flash memory), hard disk (English: hard disk drive, abbreviation: HDD) or solid state drive (English: solid-state drive Abbreviation: SSD), or memory 1502 is any other medium that can be used to carry or store desired program code in the form of an instruction or data structure and that can be accessed by a computer, but is not limited thereto. The memory 1502 may be a combination of the above memories.
处理器1501用于执行存储器1502存储的程序代码,具体用于执行上述图1至图11对应的实施例所述的方法,具体可以参照图1至图11对应的实施例实施,在此不再赘述。The processor 1501 is configured to execute the program code stored in the memory 1502, and is specifically configured to perform the method described in the foregoing embodiments of the present invention, and may be implemented by referring to the corresponding embodiments in FIG. 1 to FIG. Narration.
此处所描述的实施例仅用于说明和解释本申请,并不用于限定本申请,并且在不冲突的情况下,本申请中的实施例及实施例中的功能模块可以相互组合。The embodiments described herein are for illustrative purposes only and are not intended to limit the present application, and the functional modules in the embodiments and embodiments of the present application may be combined with each other without conflict.
本申请实施例中通过发送端获取子载波分配结果,所述子载波分配结果中包括基于所述发送端与所述至少两个接收端之间传输信号的信噪比结果为所述至少两个接收端分配的子载波;然后根据通信距离与色散补偿值的对应关系,针对分配给不同通信距离对应的接收端的子载波进行色散补偿。由于发送端与不同的接收端之间的通信距离不同,因此产生的色散不同,从而需要的色散补偿值不同,相比于现有技术中色散补偿方法对于不同的传输距离补偿相同的色散值,本申请实施例中针对每一个传输距离补偿该传输距离对应的色散值,有效的缓解了一个发送端与多个接收端进行通信的应用场景中光纤色散导致的衰落现象,并且在一定程度上提高了系统容量,降低了误码率,有助于提高光通信系统的性能。In the embodiment of the present application, the subcarrier allocation result is obtained by the sending end, where the subcarrier allocation result includes a signal to noise ratio result based on the transmitted signal between the transmitting end and the at least two receiving ends, and the result is at least two The subcarriers allocated by the receiving end are then subjected to dispersion compensation for the subcarriers allocated to the receiving ends corresponding to different communication distances according to the correspondence between the communication distance and the dispersion compensation value. Since the communication distance between the transmitting end and the different receiving end is different, the generated dispersion is different, and thus the required dispersion compensation value is different. Compared with the prior art dispersion compensation method, the same dispersion value is compensated for different transmission distances, In the embodiment of the present application, the chromatic dispersion value corresponding to the transmission distance is compensated for each transmission distance, which effectively alleviates the fading phenomenon caused by fiber dispersion in an application scenario in which a transmitting end communicates with multiple receiving ends, and improves to a certain extent. The system capacity reduces the bit error rate and helps to improve the performance of the optical communication system.
并且,所述发送端基于与所述至少两个接收端之间传输信号的信噪比结果为所述至少两个接收端分配的子载波时,根据预设信噪比范围调整为每个接收端分配的子载波,使得每个接收端分配的子载波对应的信噪比和值均满足系统需求。And, when the transmitting end is a subcarrier allocated to the at least two receiving ends based on a signal to noise ratio result of a signal transmitted between the at least two receiving ends, adjusting, according to a preset signal to noise ratio range, each receiving The subcarriers allocated by the terminal are such that the signal to noise ratio and the value corresponding to the subcarriers allocated by each receiver satisfy the system requirements.
本领域内的技术人员应明白,本申请的实施例可提供为方法、系统、或计算机程序产品。因此,本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且,本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计
算机程序产品的形式。Those skilled in the art will appreciate that embodiments of the present application can be provided as a method, system, or computer program product. Thus, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment in combination of software and hardware. Moreover, the application can employ a meter implemented on one or more computer usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer usable program code embodied therein.
The form of the computer program product.
本申请是参照根据本申请实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器,使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中,使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品,该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上,使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理,从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.
显然,本领域的技术人员可以对本申请实施例进行各种改动和变型而不脱离本申请实施例的精神和范围。这样,倘若本申请实施例的这些修改和变型属于本申请权利要求及其等同技术的范围之内,则本申请也意图包含这些改动和变型在内。
It is apparent that those skilled in the art can make various changes and modifications to the embodiments of the present application without departing from the spirit and scope of the embodiments of the present application. Thus, it is intended that the present invention cover the modifications and variations of the embodiments of the present invention.
Claims (11)
- 一种色散补偿方法,其特征在于,所述方法应用于发送端,所述发送端与至少两个接收端进行通信,且所述发送端与所述至少两个接收端之间的通信距离不同,所述方法包括:A dispersion compensation method, wherein the method is applied to a transmitting end, the transmitting end communicates with at least two receiving ends, and a communication distance between the transmitting end and the at least two receiving ends is different , the method includes:所述发送端获取子载波分配结果,所述子载波分配结果中包括基于所述发送端与所述至少两个接收端之间传输信号的信噪比结果为所述至少两个接收端分配的子载波;The transmitting end acquires a subcarrier allocation result, where the subcarrier allocation result includes a signal to noise ratio result based on a transmission signal between the transmitting end and the at least two receiving ends, which is allocated to the at least two receiving ends Subcarrier所述发送端根据通信距离与色散补偿值的对应关系,针对分配给不同通信距离对应的接收端的子载波进行色散补偿。The transmitting end performs dispersion compensation on the subcarriers allocated to the receiving ends corresponding to different communication distances according to the correspondence between the communication distance and the dispersion compensation value.
- 如权利要求1所述的方法,其特征在于,所述发送端获取子载波分配结果,包括:The method of claim 1, wherein the obtaining, by the transmitting end, the subcarrier allocation result comprises:所述发送端在预设载波包括的多个子载波上分别向所述至少两个接收端发送探测信号,并接收所述至少两个接收端中每个接收端发来的基于所述探测信号确定的信噪比结果;所述信噪比结果中包括所述预设载波中每个子载波对应的信噪比值;Sending, by the sending end, the sounding signals to the at least two receiving ends on the plurality of subcarriers included in the preset carrier, and receiving, by the receiving end, the determining, a signal to noise ratio result; the signal to noise ratio result includes a signal to noise ratio value corresponding to each subcarrier in the preset carrier;所述发送端确定所述预设载波中的第i个子载波对应的第一信噪比值是所述第i个子载波对应的多个信噪比值中最大的;其中,包括所述第一信噪比值的信噪比结果是由第一接收端发来的;所述i取遍不大于所述预设载波包括的子载波数量的正整数;Determining, by the sending end, that the first signal to noise ratio value corresponding to the i th subcarrier in the preset carrier is the largest one of the plurality of signal to noise ratio values corresponding to the i th subcarrier; wherein the first The signal to noise ratio result of the signal to noise ratio is sent by the first receiving end; the i is taken over a positive integer not greater than the number of subcarriers included in the preset carrier;所述发送端将所述第i个子载波分配给所述第一接收端,所述第一接收端为至少两个接收端中的任意一个。The transmitting end allocates the i th subcarrier to the first receiving end, and the first receiving end is any one of at least two receiving ends.
- 如权利要求1所述的方法,其特征在于,所述发送端获取子载波分配结果,包括:The method of claim 1, wherein the obtaining, by the transmitting end, the subcarrier allocation result comprises:所述发送端在预设载波包括的多个子载波上分别向所述至少两个接收端发送探测信号,并接收所述至少两个接收端中每个接收端发来的基于所述探测信号确定的信噪比结果;所述信噪比结果中包括所述预设载波中每个子载波对应的信噪比值;Sending, by the sending end, the sounding signals to the at least two receiving ends on the plurality of subcarriers included in the preset carrier, and receiving, by the receiving end, the determining, a signal to noise ratio result; the signal to noise ratio result includes a signal to noise ratio value corresponding to each subcarrier in the preset carrier;所述发送端确定所述预设载波中的第j个子载波对应的第二信噪比值是所述第j个子载波对应的多个信噪比值中最大的;其中,包括所述第二信噪比值的信噪比结果是由第二接收端发来的;所述j取遍不大于所述预设载波包括的子载波数量的正整数;Determining, by the sending end, that the second signal to noise ratio value corresponding to the jth subcarrier in the preset carrier is the largest one of the plurality of signal to noise ratio values corresponding to the jth subcarrier; wherein the second The signal to noise ratio result of the signal to noise ratio is sent by the second receiving end; the j is taken over a positive integer not greater than the number of subcarriers included in the preset carrier;所述发送端将所述第j个子载波分配给所述第二接收端;The transmitting end allocates the jth subcarrier to the second receiving end;所述发送端确定为所述第二接收端分配的各个子载波分别对应的信噪比值的和值,以及确定为第三接收端分配的各个子载波分别对应的信噪比值的和值,所述第二接收端与所述第三接收端为所述至少两个接收端中的任意两个接收端;Determining, by the transmitting end, a sum of signal to noise ratio values corresponding to respective subcarriers allocated by the second receiving end, and determining a sum of signal to noise ratio values corresponding to respective subcarriers allocated to the third receiving end The second receiving end and the third receiving end are any two of the at least two receiving ends;所述发送端在确定为所述第二接收端分配的子载波对应的和值与为所述第三接收端分配的子载波对应的和值之间的差超出预设信噪比范围时,调整为所述第二接收端分配的子载波以及为所述第三接收端分配的子载波,使得为所述第二接收端分配的子载波对应的和值与为所述第三接收端分配的子载波对应的和值之间的差在预设信噪比范围内。When the difference between the sum value corresponding to the subcarrier allocated to the second receiving end and the sum value corresponding to the subcarrier allocated to the third receiving end exceeds the preset signal to noise ratio range, Adjusting a subcarrier allocated to the second receiving end and a subcarrier allocated to the third receiving end, so that a sum value corresponding to the subcarrier allocated to the second receiving end is allocated to the third receiving end The difference between the sum values corresponding to the subcarriers is within the preset signal to noise ratio range.
- 如权利要求1至3任一项所述的方法,其特征在于,在所述发送端根据通信距离与色散补偿值的对应关系,针对分配给不同通信距离对应的接收端的子载波进行色散补偿之后,所述方法还包括:The method according to any one of claims 1 to 3, characterized in that, according to the correspondence between the communication distance and the dispersion compensation value, the transmitting end performs dispersion compensation for the subcarriers allocated to the receiving end corresponding to different communication distances. The method further includes:所述发送端分别将发送给所述至少两个接收端中每个接收端的信号进行傅里叶变换;Transmitting, by the transmitting end, a signal sent to each of the at least two receiving ends by Fourier transform;所述发送端将发送给第四接收端的经过傅里叶变换后的信号映射到为所述第四接收端分配的且经过色散补偿的子载波上,并针对映射后的信号进行反傅里叶变换后发送,所述第四接收端为所述至少两个接收端中的任意一个。 Transmitting, by the transmitting end, the Fourier-transformed signal sent to the fourth receiving end to the dispersion-compensated subcarrier allocated to the fourth receiving end, and performing inverse Fourier on the mapped signal Transmitted and transmitted, the fourth receiving end is any one of the at least two receiving ends.
- 一种色散补偿装置,其特征在于,所述装置应用于发送端,所述发送端与至少两个接收端进行通信,且所述发送端与所述至少两个接收端之间的通信距离不同,所述装置包括:A dispersion compensation device, wherein the device is applied to a transmitting end, the transmitting end communicates with at least two receiving ends, and a communication distance between the transmitting end and the at least two receiving ends is different The device includes:分配单元,用于获取子载波分配结果,所述子载波分配结果中包括基于所述发送端与所述至少两个接收端之间传输信号的信噪比结果为所述至少两个接收端分配的子载波;An allocating unit, configured to obtain a subcarrier allocation result, where the subcarrier allocation result includes, by using a signal to noise ratio result of a signal transmitted between the transmitting end and the at least two receiving ends, the at least two receiving ends are allocated Subcarrier补偿单元,用于根据通信距离与色散补偿值的对应关系,针对所述分配单元获取的子载波分配结果中包括的分配给不同通信距离对应的接收端的子载波进行色散补偿。The compensation unit is configured to perform dispersion compensation on the subcarriers allocated to the receiving end corresponding to different communication distances included in the subcarrier allocation result acquired by the allocating unit according to the correspondence between the communication distance and the dispersion compensation value.
- 如权利要求5所述的装置,其特征在于,所述分配单元,具体用于:The device according to claim 5, wherein the allocating unit is specifically configured to:接收所述至少两个接收端中每个接收端发送的所述每个接收端与所述发送端之间传输信号的信噪比结果;Receiving a signal to noise ratio result of a signal transmitted between each of the receiving ends and the transmitting end sent by each of the at least two receiving ends;基于所述至少两个接收端分别发来的信噪比结果为所述至少两个接收端分配子载波。And assigning a subcarrier to the at least two receiving ends based on a signal to noise ratio result respectively sent by the at least two receiving ends.
- 如权利要求6所述的装置,其特征在于,所述分配单元,具体用于:The device according to claim 6, wherein the allocating unit is specifically configured to:在预设载波包括的多个子载波上分别向所述至少两个接收端发送探测信号,并接收所述至少两个接收端中每个接收端发来的基于所述探测信号确定的信噪比结果;所述信噪比结果中包括所述预设载波中每个子载波对应的信噪比值;Sending a sounding signal to the at least two receiving ends on a plurality of subcarriers included in the preset carrier, and receiving a signal to noise ratio determined by each of the at least two receiving ends based on the sounding signal As a result, the signal to noise ratio result includes a signal to noise ratio value corresponding to each subcarrier in the preset carrier;确定所述预设载波中的第i个子载波对应的第一信噪比值是所述第i个子载波对应的多个信噪比值中最大的;其中,包括所述第一信噪比值的信噪比结果是由第一接收端发来的;所述i取遍不大于所述预设载波包括的子载波数量的正整数;Determining that the first signal to noise ratio value corresponding to the i th subcarrier in the preset carrier is the largest of the plurality of signal to noise ratio values corresponding to the i th subcarrier; wherein the first signal to noise ratio value is included The signal to noise ratio result is sent by the first receiving end; the i is taken over a positive integer not greater than the number of subcarriers included in the preset carrier;将所述第i个子载波分配给所述第一接收端,所述第一接收端为至少两个接收端中的任意一个。And allocating the ith subcarrier to the first receiving end, where the first receiving end is any one of at least two receiving ends.
- 如权利要求6所述的装置,其特征在于,所述分配单元,具体用于:The device according to claim 6, wherein the allocating unit is specifically configured to:在预设载波包括的多个子载波上分别向所述至少两个接收端发送探测信号,并接收所述至少两个接收端中每个接收端发来的基于所述探测信号确定的信噪比结果;所述信噪比结果中包括所述预设载波中每个子载波对应的信噪比值;Sending a sounding signal to the at least two receiving ends on a plurality of subcarriers included in the preset carrier, and receiving a signal to noise ratio determined by each of the at least two receiving ends based on the sounding signal As a result, the signal to noise ratio result includes a signal to noise ratio value corresponding to each subcarrier in the preset carrier;确定所述预设载波中的第j个子载波对应的第二信噪比值是所述第j个子载波对应的多个信噪比值中最大的;其中,包括所述第二信噪比值的信噪比结果是由第二接收端发来的;所述j取遍不大于所述预设载波包括的子载波数量的正整数;Determining, by the second signal to noise ratio value corresponding to the jth subcarrier, the second signal to noise ratio value corresponding to the jth subcarrier; wherein the second signal to noise ratio value is included The signal-to-noise ratio result is sent by the second receiving end; the j is taken over a positive integer not greater than the number of subcarriers included in the preset carrier;将所述第j个子载波分配给所述第二接收端;Allocating the jth subcarrier to the second receiving end;确定为所述第二接收端分配的各个子载波分别对应的信噪比值的和值,以及确定为第三接收端分配的各个子载波分别对应的信噪比值的和值,所述第二接收端与所述第三接收端为所述至少两个接收端中的任意两个接收端;Determining a sum of signal to noise ratio values corresponding to respective subcarriers allocated to the second receiving end, and determining a sum of signal to noise ratio values corresponding to respective subcarriers allocated to the third receiving end, where The second receiving end and the third receiving end are any two of the at least two receiving ends;在确定为所述第二接收端分配的子载波对应的和值与为所述第三接收端分配的子载波对应的和值之间的差超出预设信噪比范围时,调整为所述第二接收端分配的子载波以及为所述第三接收端分配的子载波,使得为所述第二接收端分配的子载波对应的和值与为所述第三接收端分配的子载波对应的和值之间的差在预设信噪比范围内。Adjusting to the difference when the difference between the sum value corresponding to the subcarrier allocated to the second receiving end and the sum value corresponding to the subcarrier allocated to the third receiving end exceeds a preset signal to noise ratio range a subcarrier allocated by the second receiving end and a subcarrier allocated to the third receiving end, so that a sum value corresponding to the subcarrier allocated to the second receiving end corresponds to a subcarrier allocated for the third receiving end The difference between the sum values is within the preset signal to noise ratio range.
- 如权利要求5至8任一项所述的装置,其特征在于,所述装置还包括傅里叶变换单元以及反傅里叶变换单元:The apparatus according to any one of claims 5 to 8, wherein the apparatus further comprises a Fourier transform unit and an inverse Fourier transform unit:所述傅里叶变换单元,用于在所述补偿单元根据通信距离与色散补偿值的对应关系,针对分配给不同通信距离对应的接收端的子载波进行色散补偿之后,分别将发送给所述至少两个接收端中每个接收端的信号进行傅里叶变换; The Fourier transform unit is configured to send, to the compensation unit, the dispersion to the subcarriers corresponding to the receiving end corresponding to different communication distances according to the correspondence between the communication distance and the dispersion compensation value, and then send the a signal of each of the two receiving ends is subjected to Fourier transform;所述补偿单元,还用于将发送给第四接收端的经过所述傅里叶变换单元变换后的信号映射到为所述第四接收端分配的且经过色散补偿的子载波上,所述第四接收端为所述至少两个接收端中的任意一个;The compensation unit is further configured to map, by the Fourier transform unit, the signal transformed by the Fourier transform unit to the fourth receiver, and the dispersion-compensated subcarrier, the The four receiving ends are any one of the at least two receiving ends;所述反傅里叶变换单元,用于针对所述补偿单元映射后的信号进行反傅里叶变换后发送给所述第四接收端。The inverse Fourier transform unit is configured to perform inverse Fourier transform on the signal mapped by the compensation unit, and then send the signal to the fourth receiving end.
- 一种发送端,其特征在于,所述发送端与至少两个接收端进行通信,且所述发送端与所述至少两个接收端之间的通信距离不同,所述装置包括存储器以及处理器;A transmitting end, wherein the transmitting end communicates with at least two receiving ends, and a communication distance between the transmitting end and the at least two receiving ends is different, and the device includes a memory and a processor. ;所述存储器,用于存储所述处理器执行的程序;The memory is configured to store a program executed by the processor;所述处理器,用于执行所述存储器存储的程序,以执行权利要求1至4任一项所述的方法。The processor is configured to execute the program stored in the memory to perform the method of any one of claims 1 to 4.
- 一种计算机存储介质,其特征在于,所述计算机可读存储介质存储有计算机可执行指令,所述计算机可执行指令用于使所述计算机执行权利要求1至4任一项所述的方法。 A computer storage medium, characterized in that the computer readable storage medium stores computer executable instructions for causing the computer to perform the method of any one of claims 1 to 4.
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