CN101867535A - Methods, devices and systems for generating and receiving difference quadrature phase shift keying codes - Google Patents
Methods, devices and systems for generating and receiving difference quadrature phase shift keying codes Download PDFInfo
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Abstract
The embodiment of the invention relates to the field of communication transmission, and particularly discloses methods, devices and systems for generating and receiving difference quadrature phase shift keying (DQPSK) codes. The device for generating the difference quadrature phase shift keying (DQPSK) codes comprises a laser, a time division multiplex device, a precoding unit, a first control unit, a delay adjustable unit, a third delay adjustable unit and a double parallel modulator. The device for receiving the difference quadrature phase shift keying (DQPSK) codes comprises an optical splitter, a second control unit, a first interferometer, a second interferometer, a first balance receiver, a second balance receiver and a time division multiplex device. By adopting the technical scheme of the embodiment of the invention, the nonlinear effect of signals in the optical fiber transmission is reduced, and the optical transmission performance is improved.
Description
Technical field
The present invention relates to field of communication transmission, relate in particular to the methods, devices and systems of a kind of generation, reception difference quadrature phase shift keying codes.
Background technology
Ever-increasing video traffic has proposed higher demand to the capacity of transmission network.The main high end line bearer rate of optical transport network is 10Gb/s at present, and the high-end carrying line speed of optical-fiber network of future generation is 40Gb/s or is the speed higher than 40Gb/s.With 10 times rate increase, its carrying bandwidth demand can be that the factor increases with 10 also to the capacity of Ethernet service simultaneously.
The optical link modulation format is very crucial for optical transmission system, and the selection of sign indicating number type directly influences the transmission performance of system, spectrum efficiency, non-linear tolerance, chromatic dispersion tolerance etc.In the 10Gb/s optical transmission system, and nonreturn to zero code (Non Return to Zero, NRZ)/(Return Zero RZ) is the main flow modulation format to NRZ.In the 40Gb/s optical transmission system, exist multiple alternative modulation format, as NRZ, RZ, CSRZ (Carrier Suppressed Return-to-Zero, Carrier-Suppressed Return-to-Zero), ODB (OpticalDuobinary, the optical duo-binary sign indicating number), DRZ (Return-to-Zero Optical Duobianry, optical duo-binary makes zero) and DQPSK (Differential Quadrature Phase Shift Keying, difference quadrature phase shift keying codes) etc.And the 100Gb/s optical transmission system has alternative modulation formats such as DQPSK, VSB (Vestigial Side Band, residual sideband), NRZ and ODB.
The schematic diagram of generation DQPSK light signal as shown in Figure 1 in the prior art.After the business datum process time-division demultiplexing device processing with the needs transmission, produce two-way subservice data-signal, import precoding unit respectively and carry out precoding processing, obtain I signal and Q signal.Respectively with two arms of I signal and Q signal input double-parallel modulator.The LD laser is used for providing light signal to double-parallel modulator.After the light signal that the LD laser provides was modulated through double-parallel modulator, the DQPSK light signal of business datum was carried in output.The pulse schematic diagram of the DQPSK light signal of prior art as shown in Figure 2.Business datum is represented by the phase difference of the adjacent front and back pulse of DQPSK light signal.Phase change between pulse 6 and the pulse 5 is carried information.Subscript is depicted as pulse train among the figure, and π/4 grades are the phase information of pulse.The DQPSK light signal planisphere (left side) of prior art and showing of eye pattern (right side) schematic diagram such as Fig. 3.Therefore the DQPSK optical signals has 4 constellation point 1,2,3,4 in adopting four phase modulation techniques on planisphere.Two of the eye pattern existence that right figure is DQPSK are recessed, and one is ADB, and one is ACB.Be example with constellation point 1 below, illustrate in conjunction with the planisphere and the eye pattern of DQPSK light signal.When the constellation point of current DQPSK at 1 point, next constellation point is still at 1 point, when promptly zero phase changed, constellation point did not change, this horizontal line of the ABEF of corresponding eye pattern; When next constellation point was 2 or 4, constellation point took place+/-90 degree phase change, and what this moment was corresponding is this curve of ADB; When next constellation point was 3,180 degree phase change took place in constellation point, and therefore corresponding is this broken line of ACB.To 3 points, the fluctuation of excursion maximum, so the eye pattern that causes at this moment is also maximum by 1 point transformation.And this moment eye pattern the fluctuation correspondence actual be the fluctuation of waveform power, these power fluctuations are being represented the variation of luminous power, can strengthen the nonlinear effect of light signal in transmission.And nonlinear effect can limit the distance that light signal transmits in optical fiber.
The inventor finds that in research process there is bigger power fluctuation in DQPSK light signal of the prior art, has increased the weight of the nonlinear effect of Optical Fiber Transmission; And the constellation point variation too much, thereby very sensitive to nonlinear phase noise, thereby influence the transmission performance of light signal.
Summary of the invention
The embodiment of the invention provides a kind of generation, has received the method and apparatus of difference quadrature phase shift keying codes, has reduced the nonlinear effect of signal in Optical Fiber Transmission, has improved optical transmission performance.Described technical scheme is as follows:
A kind of device that produces difference quadrature phase shift keying codes DQPSK comprises, laser, time-division demultiplexing device, precoding unit, first control unit, the adjustable unit of time-delay and double-parallel modulator; Described laser is used to export light signal; Described time-division demultiplexing device is used for business datum waiting for transmission is decomposed into the first subservice data and the second subservice data; Described precoding unit is used for the described first subservice data and the second subservice data are carried out precoding processing respectively, obtains I signal and Q signal after the precoding; Described first control unit is used to issue time-delay command and gives the adjustable unit of described time-delay; The adjustable unit of described time-delay is used for described Q signal 1 bit period of delaying time, and produces the time-delay Q signal; Described double-parallel modulator is used for described I signal and described time-delay Q signal are modulated at described light signal, produces time-delay DQPSK light signal.
The embodiment of the invention also provides a kind of device that produces difference quadrature phase shift keying codes DQPSK, comprises laser, time-division demultiplexing device, precoding unit, first control unit, the adjustable unit of delaying time, the 3rd adjustable unit of time-delay and double-parallel modulator; Described laser is used to export light signal; Described time-division demultiplexing device is used for business datum waiting for transmission is decomposed into the first subservice data and the second subservice data; Described precoding unit is used for the described first subservice data and the second subservice data are carried out precoding processing respectively, obtains I signal and Q signal after the precoding; Described first control unit is used to issue first time-delay command and gives described the 3rd time-delay adjustable unit for the adjustable unit of described time-delay and second time-delay command; The adjustable unit of described time-delay is used for according to described first time-delay command described Q signal being delayed time, and produces the time-delay Q signal; Described double-parallel modulator is used for described I signal and described time-delay Q signal are modulated at described light signal, and the time-delay of the adjustable unit of described the 3rd time-delay of process, produces time-delay DQPSK light signal; The adjustable unit of described the 3rd time-delay, be positioned on the arm of modulation Q signal of described double-parallel modulator, be used for will delaying time through the time-delay Q signal after the described double-parallel modulator modulation according to described second time-delay command, adjustable unit of described time-delay and the adjustable unit of described the 3rd time-delay are 1 bit period to the time-delay sum of Q signal.
The embodiment of the invention also provides a kind of device that receives difference quadrature phase shift keying codes DQPSK, comprises optical splitter, second control unit, first interferometer, second interferometer, first balanced reciver, second balanced reciver and time-division multiplexing device; Described optical splitter is used for receiving time-delay DQPSK light signal and described time-delay DQPSK light signal is divided into the first sub-DQPSK light signal of time-delay and the sub-DQPSK light signal of second time-delay; Described second control unit is used for issuing delayed data instruction and phase information instruction to described first interferometer and described second interferometer; Described first interferometer is used for phase control with the sub-DQPSK light signal of described first time-delay at pi/2, and 1 bit period of delaying time; Described second interferometer is used for phase control with the sub-DQPSK light signal of described second time-delay at pi/2, and 1 bit period of delaying time; Described first balanced reciver is used for the light signal after handling through described first interferometer is carried out the photoelectricity variation and through difference processing, exports the first subservice data; Described second balanced reciver is used for the light signal after handling through described second interferometer is carried out the photoelectricity variation and through difference processing, exports the second subservice data; Described time-division multiplexing device is used for the described first subservice data of time division multiplexing and the second subservice data, the outgoing traffic data.
The embodiment of the invention also provides a kind of method that produces difference quadrature phase shift keying codes DQPSK, comprises, business datum waiting for transmission is decomposed into the first subservice data and the second subservice data; The described first subservice data and the second subservice data are carried out precoding processing respectively, obtain I signal and Q signal after the precoding; According to time-delay command,, produce the time-delay Q signal with described Q signal 1 bit period of delaying time; Described I signal and described time-delay Q signal are modulated on the described light signal, produce time-delay DQPSK light signal.
The embodiment of the invention also provides a kind of method that produces difference quadrature phase shift keying codes DQPSK, comprises, business datum waiting for transmission is decomposed into the first subservice data and the second subservice data; The described first subservice data and the second subservice data are carried out precoding processing respectively, obtain I signal and Q signal after the precoding; According to first time-delay command,, produce the time-delay Q signal with described Q signal time-delay; Described I signal and described time-delay Q signal are modulated on the described light signal, and, the time-delay Q signal after ovennodulation are delayed time, produce time-delay DQPSK light signal according to second time-delay command; Described twice time-delay sum is 1 bit period.
The embodiment of the invention also provides a kind of method that receives difference quadrature phase shift keying codes DQPSK, comprises, receives time-delay DQPSK light signal and described time-delay DQPSK light signal is divided into the first sub-DQPSK light signal of time-delay and the sub-DQPSK light signal of second time-delay; According to delayed data instruction and phase information instruction, delay time the phase control of sub-DQPSK light signal at pi/2 with described first, and 1 bit period of delaying time; According to delayed data instruction and phase information instruction, delay time the phase control of sub-DQPSK light signal at pi/2 with described second, and 1 bit period of delaying time; Light signal after time-delay and the phase control is carried out the photoelectricity variation and through difference processing, exports the first subservice data; Light signal after time-delay and the phase control is carried out the photoelectricity variation and through difference processing, exports the second subservice data; The described first subservice data of time division multiplexing and the second subservice data, the outgoing traffic data.
The embodiment of the invention also provides a kind of generation, has received the system of difference quadrature phase shift keying codes, comprises the device of above-mentioned generation difference quadrature phase shift keying codes DQPSK and the device of above-mentioned reception difference quadrature phase shift keying codes DQPSK.
This shows, in embodiments of the present invention, by using control unit, the adjustable unit of delaying time, the adjustable unit of phase place, produce, receive difference quadrature phase shift keying codes, reduced the power fluctuation of transmitting optical signal, it is few to make constellation point change, reduced the sensitiveness of signal to nonlinear phase noise, thereby reduced the nonlinear effect of signal in Optical Fiber Transmission, improved optical transmission performance, helped the realization of product.Simultaneously,, make that the phase difference between the adjacent pulse carries signal, avoided because the error that the phase noise of Optical Fiber Transmission introducing brings owing to adopted the mode of differential coding.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, does not constitute limitation of the invention.In the accompanying drawings:
Fig. 1 shows the device schematic diagram that produces the DQPSK light signal in the prior art;
Fig. 2 shows the pulse schematic diagram that produces the DQPSK light signal in the prior art;
Fig. 3 shows the DQPSK light signal planisphere (left side) and eye pattern (right side) schematic diagram of prior art;
Fig. 4 shows the device schematic diagram of the generation difference quadrature phase shift keying codes of the embodiment of the invention;
Fig. 5 shows the pulse schematic diagram of the DQPSK light signal of the embodiment of the invention;
Fig. 6 shows the DQPSK light signal planisphere (left side) and eye pattern (right side) schematic diagram of the embodiment of the invention;
Fig. 7 shows the device schematic diagram of the reception difference quadrature phase shift keying codes of the embodiment of the invention;
Fig. 8 shows the method schematic diagram of the generation difference quadrature phase shift keying codes of the embodiment of the invention;
Fig. 9 shows the method schematic diagram of the reception difference quadrature phase shift keying codes of the embodiment of the invention;
Figure 10 shows another device schematic diagram of the generation difference quadrature phase shift keying codes of the embodiment of the invention.
Embodiment
Understand and realization the present invention the existing embodiments of the invention of describing in conjunction with the accompanying drawings for the ease of persons skilled in the art.At this, illustrative examples of the present invention and explanation thereof are used to explain the present invention, but not as a limitation of the invention.
The device schematic diagram of the generation difference quadrature phase shift keying codes of the embodiment of the invention as shown in Figure 4.
Comprise laser, time-division demultiplexing device, precoding unit, first control unit, the adjustable unit of time-delay and double-parallel modulator.Laser is used to export light signal.Time-division demultiplexing device is used for business datum waiting for transmission is decomposed into the first subservice data and the second subservice data.Precoding unit is used for the described first subservice data and the second subservice data are carried out precoding processing respectively, obtains I signal and Q signal after the precoding; Wherein the rule of precoding is:
Subscript in the formula is represented the time location of bit sequence,
The expression XOR.-expression negate.U, V represent the first subservice data and the second subservice data respectively.Precoding unit in the embodiment of the invention is carried out the differential coding of precoding processing and is realized on electric territory.This coding staff ratio juris is, former bit information before the coding is represented by the variation of former and later two bit amplitudes after encoding, that is: when prime information is ' 0 ', the amplitude of the back bit that the coding back is corresponding is identical with the amplitude of last bit, for example, if last bit be ' 0 ', afterwards a bit is for still being ' 0 '; If last bit is ' 1 ', then back one bit still is ' 1 '.When prime information was ' 1 ', the amplitude of the back bit that the coding back is corresponding was different with last bit, and even last bit is ' 0 ', and then back one bit is ' 1 '; If last bit is ' 1 ', then back one bit is ' 0 '.Data rate behind the coding remains unchanged, and shared bandwidth does not change.By adopting the mode of differential coding, make that the phase difference between the adjacent pulse carries signal, avoided because the error that the phase noise of Optical Fiber Transmission introducing brings.First control unit is used to issue time-delay command and gives the adjustable unit of described time-delay.First control unit can issue time-delay command by FPGA (Field Programmable Gate Array) or software and give time-delay adjustable unit.The adjustable unit of delaying time is used for described Q signal 1 bit period of delaying time is produced the time-delay Q signal.The adjustable unit of delaying time can realize by electric phase shifter specifically that by receiving the time-delay command of first control unit, electric phase shifter is the signal of telecommunication changes the signal of telecommunication in the transmission range of electric device time-delay by adjusting electric delay line.1 bit period of delaying time, the cycle time of 1 bit that promptly refers to delay time, for example bit rate is 40Gbps DQPSK, then corresponding 1 bit rate cycle time-delay is 25ps.
Described double-parallel modulator is used for described I signal and described time-delay Q signal are modulated at described light signal, produces time-delay DQPSK light signal.
Further, an adjustable unit of time-delay can also be set again on any arm of the double-parallel modulator of the embodiment of the invention.Another device schematic diagram of the generation difference quadrature phase shift keying codes of the embodiment of the invention as shown in figure 10.A kind of device that produces difference quadrature phase shift keying codes DQPSK comprises, laser, time-division demultiplexing device, precoding unit, first control unit, the adjustable unit of delaying time, the 3rd adjustable unit of time-delay and double-parallel modulator.Laser is used to export light signal.Time-division demultiplexing device is used for business datum waiting for transmission is decomposed into the first subservice data and the second subservice data.Precoding unit is used for the described first subservice data and the second subservice data are carried out precoding processing respectively, obtains I signal and Q signal after the precoding.The course of work that precoding unit is concrete can be referring to above-mentioned description to Fig. 4.First control unit is used to issue first time-delay command and gives described the 3rd time-delay adjustable unit for the adjustable unit of described time-delay and second time-delay command.The adjustable unit of delaying time is used for according to described first time-delay command described Q signal being delayed time, and produces the time-delay Q signal.Double-parallel modulator is used for described I signal and described time-delay Q signal are modulated at described light signal, and the time-delay of the adjustable unit of described the 3rd time-delay of process, produces time-delay DQPSK light signal.The adjustable unit of the 3rd time-delay, be positioned on the arm of modulation Q signal of described double-parallel modulator, be used for will delaying time through the time-delay Q signal after the described double-parallel modulator modulation according to described second time-delay command, adjustable unit of described time-delay and the adjustable unit of described the 3rd time-delay are 1 bit period to the time-delay sum of Q signal.1 bit period of delaying time, the cycle time of 1 bit that promptly refers to delay time, for example bit rate is 40Gbps DQPSK, then corresponding 1 bit rate cycle time-delay is 25ps.
Further, the embodiment of the invention can be divided into light signal by polarization beam apparatus PBS (Polarization Beam Splitter) polarization state of two quadratures by the light signal with laser output, then each polarized light signal is carried out the modulation of said method, the polarized light signal after will modulating by Polarization Beam Combiner PBC (Polarization BeamCombiner) again closes ripple output.
The pulse schematic diagram of the DQPSK light signal of the embodiment of the invention as shown in Figure 5.Double-parallel modulator be because through time-delay, so the Q signal after the time-delay, after ovennodulation, waveform can postpone 1 bit, thereby in time than 1 bit of waveform delay of prior art.As shown in Figure 5, there is not the phase change of π this moment in the variation phase.The DQPSK planisphere (left side) of the embodiment of the invention and eye pattern (right side) schematic diagram are as shown in Figure 6.Because a certain road light signal has wherein been carried out the time-delay of 1 bit, therefore avoided the π phase change of 180 degree, promptly there is not the variation of constellation point 1 to 3 or constellation point 2 to 4, only there are three kinds of variations.Here be example with constellation point 1, when current constellation point is 1, next time constellation point still is 1, seeks for ABEF corresponding right figure of this moment; Next constellation point is 2 or 4, and this moment, the eye pattern of corresponding right figure was ADB; Therefore can learn from eye pattern that the DQPSK eye pattern of the embodiment of the invention is compared with common DQPSK and do not had this broken line of ACB at this moment.
The embodiment of the invention by in producing the device of difference quadrature phase shift keying codes, use control unit, the adjustable unit of delaying time, produced the difference quadrature phase shift keying codes that has postponed 1 bit on the waveform, make and do not have the phase change of π in the waveform, reduced the power fluctuation of transmitting optical signal, it is few to make constellation point change, reduced the sensitiveness of signal, thereby reduced the nonlinear effect of signal in Optical Fiber Transmission, improved optical transmission performance nonlinear phase noise.Simultaneously,, make that the phase difference between the adjacent pulse carries signal, avoided because the error that the phase noise of Optical Fiber Transmission introducing brings owing to adopted the mode of differential coding.
The device schematic diagram of the reception difference quadrature phase shift keying codes of the embodiment of the invention as shown in Figure 7.Comprise,
Optical splitter, second control unit, first interferometer, second interferometer, first balanced reciver, second balanced reciver and time-division multiplexing device.Optical splitter is used for receiving time-delay DQPSK light signal and described time-delay DQPSK light signal is divided into the first sub-DQPSK light signal of time-delay and the sub-DQPSK light signal of second time-delay.Second control unit is used for issuing delayed data instruction and phase information instruction to described first interferometer and described second interferometer.Second control unit can come transmitting order to lower levels to give described first interferometer and described second interferometer by FPGA (Field Programmable GateArray) or software.First interferometer is used for phase control with the sub-DQPSK light signal of described first time-delay at pi/2, and 1 bit period of delaying time.Second interferometer is used for phase control with the sub-DQPSK light signal of described second time-delay at pi/2, and 1 bit period of delaying time.First balanced reciver is used for the light signal after handling through described first interferometer is carried out the photoelectricity variation and through difference processing, exports the first subservice data.Second balanced reciver is used for the light signal after handling through described second interferometer is carried out the photoelectricity variation and through difference processing, exports the second subservice data.Time-division multiplexing device is used for the described first subservice data of time division multiplexing and the second subservice data, the outgoing traffic data.
Further, first interferometer comprises,
First optical splitter is used for the sub-DQPSK light signal of described first time-delay is divided into two ways of optical signals.The adjustable unit of first time-delay is used for according to the instruction of described delayed data, with one road light signal of first optical splitter output, 1 bit period of delaying time.Can change time-delay by optical fiber being compressed or controlling temperature, or by space optics, the distance that changes between two prisms changes time-delay.The adjustable unit of first phase place is used for according to the instruction of described phase information, with the phase control of another road light signal of first optical splitter output at pi/2.Can change phase place by optical fiber being compressed or controlling temperature, or by space optics, the distance that changes between two prisms changes phase place.The change phase place is commonly referred to as the control in one-period, is commonly referred to as the interior control of a plurality of cycles and change time-delay.First closes interference of light device, is used for the light signal of described first adjustable unit of time-delay and the adjustable unit output of described first phase place is carried out the differential interferometry reception.Phase information in the signal is converted to strength information.
Further, second interferometer comprises,
Second optical splitter is used for the sub-DQPSK light signal of described second time-delay is divided into two ways of optical signals.The adjustable unit of second time-delay is used for according to the instruction of described delayed data, with one road light signal of second optical splitter output, 1 bit period of delaying time.Can change time-delay by optical fiber being compressed or controlling temperature, or by space optics, the distance that changes between two prisms changes time-delay.The adjustable unit of second phase place is used for according to the instruction of described phase information, with the phase control of another road light signal of second optical splitter output at pi/2.Can change phase place by optical fiber being compressed or controlling temperature, or by space optics, the distance that changes between two prisms changes phase place.The change phase place is commonly referred to as the control in one-period, is commonly referred to as the interior control of a plurality of cycles and change time-delay.Second closes interference of light device, is used for the light signal of described second adjustable unit of time-delay and the adjustable unit output of described second phase place is carried out the differential interferometry reception.Phase information in the signal is converted to strength information.
Adjustable unit of above-mentioned time-delay and the adjustable unit of phase place can specifically be realized in several ways: 1) realize by fiber delay line.The principle of this method is the transmission time that changes light signal by the length of regulating Transmission Fibers.2) change the length of optical fiber or crystal by temperature, thus obtain time-delay or phase place adjustable.For example can change temperature, thereby the length that changes optical fiber is controlled time-delay or phase place by the electric current that changes a temperature control circuit.Be generally refrigeration in the time of temperature control circuit electric current forward, otherwise heat, this electric current is determined its direction and size by the chip for driving output of temperature control circuit by a hot feedback circuit (proportional integral circuit), finally stablizes die temperature.3) change the refraction coefficient of light in crystal by crystal being applied electric field, thereby change the phase place or the transmission required time of light signal.Thereby obtain time-delay or phase place.1 bit period of delaying time, the cycle time of 1 bit that promptly refers to delay time, for example bit rate is 40Gbps DQPSK, then corresponding 1 bit rate cycle time-delay is 25ps.Adjustable unit of first phase place and the adjustable unit of second phase place are respectively pi/2, and the first adjustable unit of time-delay and the adjustable unit of second time-delay are 1 bit period time-delay.At this moment, first balanced reciver is consistent with the second balanced reciver output signal, can be used as mutual backup and uses.
The method schematic diagram of the generation difference quadrature phase shift keying codes of the embodiment of the invention as shown in Figure 8.
Step 801 is decomposed into the first subservice data and the second subservice data with business datum waiting for transmission;
Step 802 is carried out precoding processing respectively to the described first subservice data and the second subservice data, obtains I signal and Q signal after the precoding;
Step 803 according to time-delay command, with described Q signal 1 bit period of delaying time, produces the time-delay Q signal;
Step 804 is modulated at described I signal and described time-delay Q signal on the described light signal, produces time-delay DQPSK light signal.
Further, the method for the generation difference quadrature phase shift keying codes of the embodiment of the invention can also realize by following steps:
Business datum waiting for transmission is decomposed into the first subservice data and the second subservice data;
The described first subservice data and the second subservice data are carried out precoding processing respectively, obtain I signal and Q signal after the precoding;
According to first time-delay command,, produce the time-delay Q signal with described Q signal time-delay;
Described I signal and described time-delay Q signal are modulated on the described light signal, and, the time-delay Q signal after ovennodulation are delayed time, produce time-delay DQPSK light signal according to second time-delay command; Described twice time-delay sum is 1 bit period.
The method schematic diagram of the reception difference quadrature phase shift keying codes of the embodiment of the invention as shown in Figure 9.
A kind of method that receives difference quadrature phase shift keying codes DQPSK,
Step 901 receives time-delay DQPSK light signal and described time-delay DQPSK light signal is divided into the first sub-DQPSK light signal of time-delay and the sub-DQPSK light signal of second time-delay;
Step 902 according to delayed data instruction and phase information instruction, is delayed time the phase control of sub-DQPSK light signal at pi/2 with described first, and 1 bit period of delaying time;
Step 904 is carried out the sub-DQPSK light signal of described first time-delay after time-delay and the phase control photoelectricity variation and through difference processing, is exported the first subservice data;
Step 905 is carried out the sub-DQPSK light signal of described second time-delay after time-delay and the phase control photoelectricity variation and through difference processing, is exported the second subservice data;
Further, step is according to delayed data instruction and phase information instruction, delays time the phase control of sub-DQPSK light signal at pi/2 with described first, and 1 bit period of delaying time further comprises,
The sub-DQPSK light signal of described first time-delay is divided into two ways of optical signals;
According to the instruction of described delayed data, with one road light signal of the sub-DQPSK light signal of described first time-delay, 1 bit period of delaying time;
According to the instruction of described phase information, with the phase control of another road light signal of the sub-DQPSK light signal of described first time-delay at pi/2;
Further, step is according to delayed data instruction and phase information instruction, delays time the phase control of sub-DQPSK light signal at pi/2 with described second, and 1 bit period of delaying time further comprises,
Be used for the sub-DQPSK light signal of described second time-delay is divided into two ways of optical signals;
According to the instruction of described delayed data, with the road light signal of the sub-DQPSK of described second time-delay 1 bit period of delaying time;
According to the instruction of described phase information, with the phase control of another road light signal of the sub-DQPSK of described second time-delay at pi/2.
Contents such as the concrete signal processing of said method step, implementation and since with apparatus of the present invention embodiment based on same conception, can repeat no more referring to the narration among apparatus of the present invention embodiment herein.
The embodiment of the invention also provides a kind of generation, has received the system of difference quadrature phase shift keying codes, comprises the device of above-mentioned generation difference quadrature phase shift keying codes and the device of above-mentioned reception difference quadrature phase shift keying codes.Specifically see also the description of said apparatus.
The embodiment of the invention is by using control unit in the device that produces difference quadrature phase shift keying codes, the adjustable unit of delaying time, use the adjustable unit of time-delay at receiving terminal, the adjustable unit of phase place, produce, receive difference quadrature phase shift keying codes, on the waveform of difference quadrature phase shift keying codes, postponed 1 bit, make and do not have the phase change of π in the waveform, reduced the power fluctuation of transmitting optical signal, it is few to make constellation point change, reduced the sensitiveness of signal to nonlinear phase noise, thereby reduced the nonlinear effect of signal in Optical Fiber Transmission, improve optical transmission performance, helped the realization of product.Simultaneously,, make that the phase difference between the adjacent pulse carries signal, avoided because the error that the phase noise of Optical Fiber Transmission introducing brings owing to adopted the mode of differential coding.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential hardware platform, can certainly all implement, but the former is better execution mode under a lot of situation by hardware.Based on such understanding, all or part of can the embodying that technical scheme of the present invention contributes to background technology with the form of software product, this computer software product can be stored in the storage medium, as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are with so that a computer equipment (can be a personal computer, server, the perhaps network equipment etc.) carry out the described method of some part of each embodiment of the present invention or embodiment.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (10)
1. a device that produces difference quadrature phase shift keying codes DQPSK is characterized in that, comprise,
Laser, time-division demultiplexing device, precoding unit, first control unit, the adjustable unit of time-delay and double-parallel modulator;
Described laser is used to export light signal;
Described time-division demultiplexing device is used for business datum waiting for transmission is decomposed into the first subservice data and the second subservice data;
Described precoding unit is used for the described first subservice data and the second subservice data are carried out precoding processing respectively, obtains I signal and Q signal after the precoding;
Described first control unit is used to issue time-delay command and gives the adjustable unit of described time-delay;
The adjustable unit of described time-delay is used for described Q signal 1 bit period of delaying time, and produces the time-delay Q signal;
Described double-parallel modulator is used for described I signal and described time-delay Q signal are modulated at described light signal, produces time-delay DQPSK light signal.
2. a device that produces difference quadrature phase shift keying codes DQPSK is characterized in that, comprise,
Laser, time-division demultiplexing device, precoding unit, first control unit, the adjustable unit of delaying time, the 3rd adjustable unit of time-delay and double-parallel modulator;
Described laser is used to export light signal;
Described time-division demultiplexing device is used for business datum waiting for transmission is decomposed into the first subservice data and the second subservice data;
Described precoding unit is used for the described first subservice data and the second subservice data are carried out precoding processing respectively, obtains I signal and Q signal after the precoding;
Described first control unit is used to issue first time-delay command and gives described the 3rd time-delay adjustable unit for the adjustable unit of described time-delay and second time-delay command;
The adjustable unit of described time-delay is used for according to described first time-delay command described Q signal being delayed time, and produces the time-delay Q signal;
Described double-parallel modulator is used for described I signal and described time-delay Q signal are modulated at described light signal, and the time-delay of the adjustable unit of described the 3rd time-delay of process, produces time-delay DQPSK light signal;
The adjustable unit of described the 3rd time-delay, be positioned on the arm of modulation Q signal of described double-parallel modulator, be used for will delaying time through the time-delay Q signal after the described double-parallel modulator modulation according to described second time-delay command, adjustable unit of described time-delay and the adjustable unit of described the 3rd time-delay are 1 bit period to the time-delay sum of Q signal.
3. a device that receives difference quadrature phase shift keying codes DQPSK is characterized in that, comprise,
Optical splitter, second control unit, first interferometer, second interferometer, first balanced reciver, second balanced reciver and time-division multiplexing device;
Described optical splitter is used for receiving time-delay DQPSK light signal and described time-delay DQPSK light signal is divided into the first sub-DQPSK light signal of time-delay and the sub-DQPSK light signal of second time-delay;
Described second control unit is used for issuing delayed data instruction and phase information instruction to described first interferometer and described second interferometer;
Described first interferometer is used for phase control with the sub-DQPSK light signal of described first time-delay at pi/2, and 1 bit period of delaying time;
Described second interferometer is used for phase control with the sub-DQPSK light signal of described second time-delay at pi/2, and 1 bit period of delaying time;
Described first balanced reciver is used for the light signal after handling through described first interferometer is carried out the photoelectricity variation and through difference processing, exports the first subservice data;
Described second balanced reciver is used for the light signal after handling through described second interferometer is carried out the photoelectricity variation and through difference processing, exports the second subservice data;
Described time-division multiplexing device is used for the described first subservice data of time division multiplexing and the second subservice data, the outgoing traffic data.
4. device as claimed in claim 3 is characterized in that,
Described first interferometer further comprises,
First optical splitter is used for the sub-DQPSK light signal of described first time-delay is divided into two ways of optical signals;
The adjustable unit of first time-delay is used for according to the instruction of described delayed data, with one road light signal of first optical splitter output, 1 bit period of delaying time;
The adjustable unit of first phase place is used for according to the instruction of described phase information, with the phase control of another road light signal of first optical splitter output at pi/2;
First closes interference of light device, is used for the light signal of described first adjustable unit of time-delay and the adjustable unit output of described first phase place is carried out the differential interferometry reception.
5. device as claimed in claim 3 is characterized in that,
Described second interferometer further comprises,
Second optical splitter is used for the sub-DQPSK light signal of described second time-delay is divided into two ways of optical signals;
The adjustable unit of second time-delay is used for according to the instruction of described delayed data, with one road light signal of second optical splitter output, 1 bit period of delaying time;
The adjustable unit of second phase place is used for according to the instruction of described phase information, with the phase control of another road light signal of second optical splitter output at pi/2;
Second closes interference of light device, is used for the light signal of described second adjustable unit of time-delay and the adjustable unit output of described second phase place is carried out the differential interferometry reception.
6. a method that produces difference quadrature phase shift keying codes DQPSK is characterized in that, comprise,
Business datum waiting for transmission is decomposed into the first subservice data and the second subservice data;
The described first subservice data and the second subservice data are carried out precoding processing respectively, obtain I signal and Q signal after the precoding;
According to time-delay command,, produce the time-delay Q signal with described Q signal 1 bit period of delaying time;
Described I signal and described time-delay Q signal are modulated on the described light signal, produce time-delay DQPSK light signal.
7. a method that produces difference quadrature phase shift keying codes DQPSK is characterized in that, comprise,
Business datum waiting for transmission is decomposed into the first subservice data and the second subservice data;
The described first subservice data and the second subservice data are carried out precoding processing respectively, obtain I signal and Q signal after the precoding;
According to first time-delay command,, produce the time-delay Q signal with described Q signal time-delay;
Described I signal and described time-delay Q signal are modulated on the described light signal, and, the time-delay Q signal after ovennodulation are delayed time, produce time-delay DQPSK light signal according to second time-delay command; Described twice time-delay sum is 1 bit period.
8. a method that receives difference quadrature phase shift keying codes DQPSK is characterized in that, comprise,
Receive time-delay DQPSK light signal and described time-delay DQPSK light signal is divided into the first sub-DQPSK light signal of time-delay and the sub-DQPSK light signal of second time-delay;
According to delayed data instruction and phase information instruction, delay time the phase control of sub-DQPSK light signal at pi/2 with described first, and 1 bit period of delaying time;
According to delayed data instruction and phase information instruction, delay time the phase control of sub-DQPSK light signal at pi/2 with described second, and 1 bit period of delaying time;
The sub-DQPSK light signal of described first time-delay after time-delay and the phase control is carried out the photoelectricity variation and through difference processing, exports the first subservice data;
The sub-DQPSK light signal of described second time-delay after time-delay and the phase control is carried out the photoelectricity variation and through difference processing, exports the second subservice data;
The described first subservice data of time division multiplexing and the second subservice data, the outgoing traffic data.
9. method as claimed in claim 8 is characterized in that, described step is according to delayed data instruction and phase information instruction, delays time the phase control of sub-DQPSK light signal at pi/2 with described first, and 1 bit period of delaying time further comprises,
The sub-DQPSK light signal of described first time-delay is divided into two ways of optical signals;
According to the instruction of described delayed data, with one road light signal of the sub-DQPSK light signal of described first time-delay, 1 bit period of delaying time;
According to the instruction of described phase information, with the phase control of another road light signal of the sub-DQPSK light signal of described first time-delay at pi/2;
Described step is according to delayed data instruction and phase information instruction, delays time the phase control of sub-DQPSK light signal at pi/2 with described second, and 1 bit period of delaying time further comprises,
The sub-DQPSK light signal of described second time-delay is divided into two ways of optical signals;
According to the instruction of described delayed data, with the road light signal of the sub-DQPSK of described second time-delay 1 bit period of delaying time;
According to the instruction of described phase information, with the phase control of another road light signal of the sub-DQPSK of described second time-delay at pi/2.
10. a generation, receive the system of difference quadrature phase shift keying codes, it is characterized in that, comprise the device of generation difference quadrature phase shift keying codes DQPSK as claimed in claim 1 and the device of reception difference quadrature phase shift keying codes DQPSK as claimed in claim 3.
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| CN103607245A (en) * | 2013-11-22 | 2014-02-26 | 哈尔滨工业大学深圳研究生院 | Optical transmitter with hybrid modulation format |
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| CN110050421A (en) * | 2016-12-06 | 2019-07-23 | 华为技术有限公司 | A kind of device and method generating optical signal |
| CN108592963A (en) * | 2018-03-29 | 2018-09-28 | 北京大学 | A kind of suppressing method and its system of time division multiplexing optical fiber sensing system multiplicative noise |
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