WO2009135413A1 - Procédé et appareil de modulation optique, émetteur de compensation de dispersion - Google Patents

Procédé et appareil de modulation optique, émetteur de compensation de dispersion Download PDF

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Publication number
WO2009135413A1
WO2009135413A1 PCT/CN2009/071401 CN2009071401W WO2009135413A1 WO 2009135413 A1 WO2009135413 A1 WO 2009135413A1 CN 2009071401 W CN2009071401 W CN 2009071401W WO 2009135413 A1 WO2009135413 A1 WO 2009135413A1
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Prior art keywords
signal
unit
optical
modulated signal
power adjustment
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PCT/CN2009/071401
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English (en)
Chinese (zh)
Inventor
陶智慧
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华为技术有限公司
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Publication of WO2009135413A1 publication Critical patent/WO2009135413A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/503—Laser transmitters
    • H04B10/505—Laser transmitters using external modulation
    • H04B10/5053—Laser transmitters using external modulation using a parallel, i.e. shunt, combination of modulators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2210/00—Indexing scheme relating to optical transmission systems
    • H04B2210/25—Distortion or dispersion compensation
    • H04B2210/254—Distortion or dispersion compensation before the transmission line, i.e. pre-compensation

Definitions

  • the present invention relates to the field of communication transmission, and in particular to a light modulation apparatus, method and dispersion pre-compensation transmitter. Background technique
  • Dispersion is a phenomenon in which signal distortion is caused by different frequency components of signals transmitted in an optical fiber or by different transmission speeds of various mode components of a signal.
  • the effect of chromatic dispersion on optical transmission is to cause inter-symbol interference between data pulses.
  • the damage caused by dispersion to system performance is not negligible.
  • fiber transmission systems with transmission rates above 10 Gbit/s require dispersion compensation technology to ensure the transmission function of the system.
  • the electric field dispersion compensation refers to partial or complete compensation of the degradation of the transmission signal by the method of electric field signal processing in the transmitting module or the receiving module of the optical transmission system.
  • the electric field dispersion compensation in the receiving module is limited by the square detection of the photodetector, and its compensation ability is limited, and the electric field dispersion pre-compensation at the origin is long-distance dispersion compensation capability, so it has a large commercial prospect. .
  • the dispersion pre-compensation method can compensate for the transmission distance of thousands of kilometers, it must be received near the predetermined compensation distance. If the transmission distance changes due to wavelength routing or the like, the transmitter electrical domain also needs to change the power of the electrical signal.
  • the prior art uses a drive voltage gain that changes the electro-optic modulator to change the power of the electrical signal, which is then modulated by the electro-optic modulator into an optical signal output.
  • the electro-optic modulator has a low driving voltage; long distance Under the transmission condition, the driving voltage of the electro-optic modulator is high, so the driving voltage of the electro-optic modulator required for different transmission distances is also different, so there are different requirements for the driver that provides the driving voltage.
  • the driver needs to have a large voltage gain and a wide passband. Therefore, the product of the common voltage gain and bandwidth is an important indicator to measure its performance, which is called the gain bandwidth product.
  • the gain bandwidth product is used to characterize the coordination between gain and effective bandwidth when using a driver in a circuit. Within a wide range, the product of gain and bandwidth remains essentially unchanged.
  • the bandwidth decreases due to the internal effects of the driver; at the same time, as the bandwidth increases, the corresponding gain decreases.
  • This limitation by its very nature, is determined by the physical parameters of the electrical device. Since the lower cutoff frequency of the driver is typically very low or zero frequency, the bandwidth can be expressed as the upper cutoff frequency.
  • the driver gain needs to be adjusted according to different transmission distances. Since the gain bandwidth product of the electrical device is constant, the driver must have a high gain when the transmission distance is relatively long. At this time, achieving a wide frequency band is a big difficulty. For a signal above 10 Gb/s, the driver is implemented. very difficult.
  • a technical problem to be solved by embodiments of the present invention is to provide a light modulation device, a light modulation method, and a dispersion precompensation transmitter including the light modulation device capable of realizing a high frequency band and high gain.
  • the embodiment of the invention provides a light modulation device, comprising:
  • a branching unit for dividing the input optical signal into the first branch optical signal and the second branch optical signal and outputting
  • An optical power adjustment unit configured to adjust power of at least one of the first branch optical signal and the second branch optical signal output by the branch unit
  • An electro-optical modulation unit configured to receive the input first pre-compensated electrical signal and modulate the first branch optical signal output by the optical power adjustment unit according to the first pre-compensated electrical signal
  • the first modulated signal receives the input second pre-compensated electrical signal and modulates the second branch optical signal output by the optical power adjusting unit according to the second pre-compensated electrical signal to generate a second modulated signal;
  • the electro-optic modulation unit is configured to receive the input first pre-compensated electrical signal and modulate the first branch optical signal output by the optical power adjusting unit according to the first pre-compensated electrical signal to generate a first modulated signal, Receiving the input second pre-compensated electrical signal and modulating the second branch optical signal output by the branching unit according to the second pre-compensated electrical signal to generate a second modulated signal; or
  • the electro-optic modulation unit is configured to receive the input first pre-compensated electrical signal and modulate the first branch optical signal output by the branching unit according to the first pre-compensated electrical signal to generate a first modulated signal, and receive input a second pre-compensated electrical signal and modulating the second branch optical signal output by the optical power adjusting unit according to the second pre-compensated electrical signal to generate a second modulated signal;
  • a combining unit configured to synthesize the first modulated signal and the second modulated signal into a modulated signal.
  • the embodiment of the invention further provides a light modulation device, comprising:
  • a branching unit for dividing the input optical signal into the first branch optical signal and the second branch optical signal and outputting
  • An electro-optical modulation unit configured to receive the input first pre-compensated electrical signal and modulate the first branch optical signal output by the branching unit according to the first pre-compensated electrical signal to generate a first modulated signal, and output the second pre-input input Compensating the electrical signal and modulating the second branch optical signal output by the branching unit according to the second pre-compensated electrical signal to generate a second modulated signal and outputting the second modulated signal;
  • An optical power adjustment unit configured to adjust a power output of the first modulation signal output by the electro-optic modulation unit and the second modulation signal output by the electro-optic modulation unit, and output the power;
  • a combining unit configured to synthesize the first modulated signal after the power adjustment unit power adjustment and the second modulated signal output by the electro-optic modulation unit into a modulated signal
  • the combining unit is configured to output a first modulated signal of the electro-optic modulation unit and The second modulated signal adjusted by the optical power adjustment unit synthesizes a modulated signal;
  • the combining unit is configured to synthesize the first modulation signal and the second modulation signal after the power adjustment unit power adjustment into a modulated signal.
  • the embodiment of the invention further provides a light modulation method, including the steps of:
  • the first modulated signal and the second modulated signal are combined into a modulated signal.
  • An embodiment of the present invention further provides a light modulation method, including the steps of: dividing an input optical signal into a first branch optical signal and a second branch optical signal;
  • Embodiments of the present invention also provide a dispersion pre-compensation transmitter including the above-described light modulation device.
  • the embodiment of the invention further provides a chromatic dispersion pre-compensation transmitter, comprising the above-mentioned light modulating device, further comprising:
  • a digital processing unit configured to perform dispersion pre-compensation on the input data, and generate a first pre-compensated digital signal and a second pre-compensated digital signal;
  • a first digital-to-analog conversion unit configured to convert the first pre-compensated digital signal into a first pre-compensated electrical signal and output the signal
  • a second digital-to-analog conversion unit configured to convert the second pre-compensated digital signal into a second pre-compensated electrical signal and output the signal
  • the embodiment of the invention has at least the following advantages:
  • the power of the modulated signal output from the optical modulation device is adjusted, and may not be used at high speed.
  • Achieving a difficult driver overcomes the bottleneck caused by the gain bandwidth product limitation of the electrical device. Since the bandwidth of the optical device is wider than that of the electrical device, a wide frequency band and a high gain can be realized, and the modulation efficiency of the light is determined by the electro-optical effect, and the power adjustment is relatively easy, and the power of the modulated signal of the output can be more accurately realized. Adjustment. DRAWINGS
  • FIG. 1 is a block diagram of an implementation of a light modulating device according to Embodiment 1 of the present invention.
  • FIG. 2 is a block diagram of an implementation of an optical modulation apparatus according to Embodiment 2 of the present invention.
  • FIG. 3 is a block diagram of an implementation of a light modulating device according to Embodiment 3 of the present invention.
  • FIG. 4 is a block diagram showing an implementation of a light modulating device according to Embodiment 4 of the present invention.
  • FIG. 5 is a block diagram showing an implementation of an optical modulation apparatus according to Embodiment 5 of the present invention.
  • FIG. 6 is a block diagram showing an implementation of a light modulation device according to Embodiment 6 of the present invention.
  • Embodiment 7 is a flowchart of a light modulation method according to Embodiment 7 of the present invention.
  • Embodiment 8 is a flowchart of a light modulation method according to Embodiment 8 of the present invention.
  • Embodiment 9 is a dispersion pre-compensation transmitter according to Embodiment 9 of the present invention.
  • Embodiment 11 is a dispersion pre-compensation transmitter according to Embodiment 10 of the present invention.
  • FIG. 12 is a dispersion pre-compensation transmitter according to Embodiment 11 of the present invention. detailed description
  • the electro-optic modulator is composed of a branching unit, an optical power adjusting unit, an electro-optic modulating unit, and a combining unit.
  • the branching unit splits the input optical signal into a first branch optical signal and a second branch optical signal.
  • the optical power adjustment unit adjusts the power of at least one of the first branch optical signal and the second branch optical signal output by the branch unit, and outputs the power.
  • the optical power adjustment unit may include one or more of a light adjustable attenuation module, a light polarization module, and an optical amplification module.
  • the light adjustable attenuation module can be an optically adjustable attenuator;
  • the light polarization module can include a light polarization controller and a polarizer;
  • the optical amplification module can be an optical amplifier.
  • the optical power adjusting unit in the block diagram of the generating device of the light modulating device provided by the first embodiment of the present invention includes a first optical power adjusting subunit and a second optical power adjusting subunit.
  • the first optical power adjustment subunit adjusts the power of the first branch optical signal output by the branch unit
  • the second optical power adjustment subunit adjusts the power of the second branch optical signal output by the branch unit.
  • the electro-optic modulation unit receives the input first pre-compensation electrical signal and modulates the first branch optical signal adjusted by the optical power adjustment unit according to the first pre-compensated electrical signal to generate a first modulated signal, and receives a second pre-compensation input And modulating the second branch optical signal adjusted by the optical power adjusting unit according to the second pre-compensated electrical signal to generate a second modulated signal; or
  • the electro-optic modulation unit receives the input first pre-compensated electrical signal and modulates the first branch optical signal output by the optical power adjusting unit according to the first pre-compensated electrical signal to generate a first modulated signal, and receives the input second pre-compensated electrical signal And modulating the second branch optical signal output by the branch unit according to the second pre-compensated electrical signal to generate a second modulated signal; or, the electro-optic modulating unit receives the input first pre-compensated electrical signal and according to the first pre-compensated electrical signal pair
  • the first branch optical signal output by the branching unit is modulated to generate a first modulated signal, receives the input second pre-compensated electrical signal, and modulates the second branch optical signal output by the optical power adjusting unit according to the second pre-compensated electrical signal
  • a second modulated signal is generated.
  • the electro-optic modulation unit includes a first electro-optic modulation sub-unit and a second electro-optic modulation sub-unit, wherein the first electro-optic modulation sub-unit receives the input first pre-compensated electrical signal and performs the first branch optical signal according to the first pre-compensated electrical signal The modulation produces a first modulated signal, the second electrical light modulation subunit receives the input second pre-compensated electrical signal and modulates the second branched optical signal according to the second pre-compensated electrical signal to produce a second modulated signal.
  • the combining unit combines the first modulated signal and the second modulated signal into one modulated signal and outputs the same.
  • the power of the branch optical signal By adjusting the power of the branch optical signal, it is possible to adjust the bottleneck caused by the gain bandwidth product limitation of the modulated device output from the combining unit. Since the bandwidth of the optical device is wider than that of the electrical device, a wide frequency band and a high gain can be realized, and the modulation efficiency of the light is determined by the electro-optical effect, and the power adjustment is relatively easy, and the power of the modulated signal of the output can be more accurately realized. Adjustment.
  • the optical power adjustment unit can adjust only the power of the first branch optical signal in the case where only the power of the first branch optical signal needs to be adjusted.
  • the light modulating device of the embodiment of the present invention may be a Mach-Zehnder modulator or a dual parallel modulator.
  • the first branch optical signal and the second branch optical signal pass through the optical power adjusting unit, and then modulated by the electro-optical modulation unit.
  • the first path optical signal and the second branch optical signal can also be modulated by the electro-optic modulation unit into the first modulation signal and the second modulation signal, and then the first modulation signal and the second modulation are adjusted by the optical power adjustment unit.
  • the power of the signal is then combined with the first modulated signal adjusted by the optical power adjusting unit and the second modulated signal adjusted by the optical power adjusting unit by a combining unit to synthesize a modulated signal.
  • the light modulating device of the embodiment of the present invention may include:
  • a branching unit for dividing the input optical signal into the first branch optical signal and the second branch optical signal and outputting
  • An electro-optical modulation unit configured to receive the input first pre-compensated electrical signal and modulate the first branch optical signal output by the branching unit according to the first pre-compensated electrical signal to generate a first modulated signal, and output the second pre-input input Compensating the electrical signal and modulating the second branch optical signal output by the branching unit according to the second pre-compensated electrical signal to generate a second modulated signal and outputting the second modulated signal;
  • An optical power adjustment unit configured to adjust a power output of the first modulation signal output by the electro-optic modulation unit and the second modulation signal output by the electro-optic modulation unit, and output the power;
  • a combining unit configured to synthesize the first modulated signal after the power adjustment of the optical power adjustment unit and the second modulated signal output by the electro-optic modulation unit into a modulated signal
  • the second modulated signal is combined into a modulated signal
  • the first modulated signal and the second modulated signal after the power adjustment unit power is adjusted are combined into a modulated signal.
  • the optical power adjustment unit may include one or more of a light adjustable attenuation module, a light polarization module, and an optical amplification module.
  • the adjustable attenuation module may be an optically adjustable attenuator; the optical polarization module may include a light polarization controller and a polarizing plate; and the optical amplification module may be an optical amplifier.
  • the optical power adjustment unit may include: a first optical power adjustment subunit configured to adjust a power output of the first modulation signal output by the electro-optic modulation unit; and a second optical power adjustment sub-unit configured to adjust an electro-optic modulation unit output The power of the second modulated signal is output.
  • the electro-optic modulation unit may include: a first electro-optic modulation sub-unit configured to receive the input first pre-compensated electrical signal and modulate the first branch optical signal output by the branch unit according to the first pre-compensated electrical signal Generating a first modulated signal and outputting the second modulated optical subunit for receiving the input second pre-compensated electrical signal and modulating the second branched optical signal output by the branching unit according to the second pre-compensated electrical signal The second modulated signal is output.
  • the correspondence between the dispersion compensation distance and the power adjustment unit power adjustment value in the case of the minimum bit error rate can be found according to the previous experience value, thereby obtaining the power adjustment value of the optical power adjustment unit corresponding to a certain distance, and then the obtained
  • the optical power adjustment unit power adjustment value adjusts the optical power adjustment unit provided by the embodiment of the present invention to transmit normal data to the location of the specific distance.
  • 2 is a block diagram of an implementation of an optical modulation apparatus according to Embodiment 2 of the present invention. Compared with the implementation diagram of the optical modulation apparatus provided in Embodiment 1 of the present invention, an optical power control subunit, an optical power control subunit, is further provided.
  • the optical power adjustment unit power adjustment value corresponding to the different dispersion compensation distance may be pre-stored, and the first optical power adjustment sub-unit and the second optical power adjustment sub-unit are adjusted according to the optical power adjustment unit power adjustment value corresponding to the dispersion compensation distance.
  • the optical power adjustment unit power adjustment values corresponding to the different dispersion compensation distances may be obtained by the risk value.
  • the optical power control subunit can automatically adjust the first power adjustment value according to the optical power adjustment unit corresponding to the dispersion compensation distance.
  • the branching unit divides the input optical signal into a first tributary optical signal and a second tributary optical signal, and the first electro-optical modulation sub-unit receives the input first pre-compensation. And modulating the first branch optical signal according to the first pre-compensated electrical signal to generate a first modulated signal, receiving the input second pre-compensated electrical signal, and performing the second branched optical signal according to the second pre-compensated electrical signal Modulation produces a second modulated signal.
  • the first optical power adjustment subunit adjusts the power of the first modulated signal.
  • the combining unit combines the first modulated signal adjusted by the first optical power adjustment subunit and the second modulated signal modulated by the second electro-optical modulation subunit into a modulated signal and outputs the modulated signal.
  • the power of the modulated signal output from the combining unit can be adjusted, and the driver with high difficulty can be eliminated at high speed, thereby overcoming the limitation of the gain bandwidth product of the electrical device.
  • the correspondence between the dispersion compensation distance and the power adjustment unit power adjustment value in the case of the minimum bit error rate can be found according to the previous experience value, thereby obtaining the power adjustment value of the optical power adjustment unit corresponding to a certain distance, and then the obtained
  • the optical power adjustment unit power adjustment value adjusts the optical power adjustment unit provided by the embodiment of the present invention to transmit normal data to the location of the specific distance.
  • FIG. 4 is a block diagram of an implementation of an optical modulation apparatus according to Embodiment 4 of the present invention. Compared with the implementation diagram of the optical modulation apparatus provided in Embodiment 3 of FIG. 3, an optical power control subunit and an optical power control subunit are further provided.
  • the optical power adjustment unit power adjustment value corresponding to the different dispersion compensation distance may be pre-stored, and the first optical power adjustment sub-unit and the second optical power adjustment sub-unit are adjusted according to the optical power adjustment unit power adjustment value corresponding to the dispersion compensation distance.
  • the optical power adjustment unit power adjustment values corresponding to the different dispersion compensation distances may be obtained based on empirical values.
  • FIG. 5 is a block diagram of an implementation of an optical modulation apparatus according to Embodiment 5 of the present invention, wherein the optical power adjustment unit includes an optically adjustable attenuation module and an optical amplification module.
  • the branch unit divides the input optical signal into a first branch optical signal and a second branch optical signal, and the optical adjustable attenuation module can perform gain control on the input first branch optical signal and the second branch optical signal, and adjust the first The power of the branch optical signal and the second branch optical signal.
  • the optical amplifying module can perform gain control on the input first branch optical signal and the second branch optical signal to adjust power of the first branch optical signal and the second branch optical signal.
  • the optically adjustable attenuation module provided in Embodiment 5 of the present invention may include a first adjustable attenuator and a second adjustable attenuator, and the optical amplification module may be a first optical amplifier and a second optical amplifier.
  • the first adjustable attenuator and the first optical amplifier are used to adjust the power of the first branch optical signal
  • the second adjustable attenuator and the second optical amplifier are used to adjust the power of the second branch optical signal.
  • the first electro-optic modulation sub-unit receives the first pre-compensated electrical signal input from the outside and modulates the power-adjusted first-branch optical signal according to the first pre-compensated electrical signal to generate a first modulated signal
  • the second electro-optic modulation sub-unit Receiving a second pre-compensated electrical signal input from the outside and modulating the power-adjusted second branch optical signal according to the second pre-compensated electrical signal to generate a second modulated signal.
  • the combining unit combines the first modulated signal and the second modulated signal into one modulated signal.
  • 6 is a block diagram of an implementation of a light modulating device according to Embodiment 6 of the present invention, wherein the light polarization module includes a first polarization controller, a second polarization controller, and a first polarizer and a second polarizer.
  • the branching unit splits the input optical signal into a first branch optical signal and a second branch optical signal.
  • the first polarization controller controls the polarization state of the first branch optical signal such that the polarization direction of the first branch optical signal produces a certain angle.
  • the first polarizing plate is configured to turn on the first branch optical signal with the polarization direction of the polarizing plate, and cut off the first branch optical signal with the polarization direction of the polarizing plate by 90 degrees, so that the polarization-controlled first branch optical signal After the first polarizer is generated, corresponding attenuation is generated, and the function of adjusting the power of the optical signal of the first branch is realized.
  • the second polarization controller controls the polarization state of the second branch optical signal such that the polarization direction of the second branch optical signal produces a certain angle.
  • the second polarizing plate is used for conducting the second branch optical signal with the polarization direction of the polarizing plate, and the polarization direction of the cutoff and the polarizing plate is different by 90.
  • the second branch optical signal is such that the polarization-controlled second branch optical signal passes through the second polarizer to generate a corresponding attenuation, thereby realizing the function of adjusting the power of the second branch optical signal.
  • the first electro-optic modulation sub-unit receives the input first pre-compensated electrical signal and modulates the power-adjusted first branch optical signal according to the first pre-compensated electrical signal to generate a first modulated signal, and receives the input second pre-compensated power And modulating the power adjusted second branch optical signal according to the second pre-compensated electrical signal to generate a second modulated signal.
  • the combining unit combines the first modulated signal and the second modulated signal into a modulated signal.
  • FIG. 7 is a flowchart of a light modulation method according to Embodiment 7 of the present invention, including the steps of:
  • the input optical signal is divided into a first branch optical signal and a second branch optical signal.
  • the power of at least one of the first branch optical signal and the second branch optical signal may be adjusted by one or more of the following three methods:
  • the power of at least one of the first branch optical signal and the second branch optical signal is adjusted by the optical amplifier.
  • the power of the branch optical signal By adjusting the power of the branch optical signal, it is possible to adjust the bottleneck caused by the gain bandwidth product limitation of the modulated device output from the combining unit. Since the bandwidth of the optical device is wider than that of the electrical device, a wide frequency band and a high gain can be realized, and the modulation efficiency of the light is determined by the electro-optical effect, and the power adjustment is relatively easy, and the power of the modulated signal of the output can be more accurately realized. Adjustment.
  • FIG. 8 is a flowchart of an optical modulation method according to Embodiment 8 of the present invention, including the steps of: 5801.
  • the input optical signal is divided into a first branch optical signal and a second branch optical signal.
  • S804 Combine the first modulated signal and the second modulated signal into one modulated signal.
  • the power of at least one of the first modulated signal and the second modulated signal may be adjusted by one or more of the following three methods:
  • the power of at least one of the first modulated signal and the second modulated signal is adjusted by an optical amplifier.
  • the power of the modulated signal outputted from the combining unit is adjusted by adjusting the power of the modulated signal modulated by the electro-optical modulation unit. Since the bandwidth of the optical device is wider than that of the electrical device, a wide band and a high gain can be realized. At the same time, the power adjustment of the light is relatively easy, the modulation efficiency is determined by the electro-optic effect, and the power adjustment is relatively easy, so that a more accurate adjustment of the output modulated signal power can be achieved.
  • Embodiment 9 is a dispersion pre-compensation transmitter provided in Embodiment 9 of the present invention.
  • the digital processing unit performs dispersion pre-compensation on the input data and generates a first pre-compensated digital signal and a second pre-compensated digital signal.
  • the first digital-to-analog conversion unit converts the first pre-compensated digital signal into a first pre-compensated electrical signal and then sends the first pre-compensated digital signal into the first electro-optic modulation sub-unit; and the second digital-to-analog conversion unit converts the second pre-compensated digital signal into a second pre-compensated The electrical signal is then sent to the second electro-optic modulation subunit.
  • the laser emitting unit emits an optical signal to the branching unit, and the branching unit splits the input optical signal into a first branch optical signal and a second branch optical signal.
  • the optical power adjusting unit adjusts the power of at least one of the first branch optical signal and the second branch optical signal.
  • the first optical power adjusting subunit adjusts the power of the first branch optical signal
  • the second The optical power adjustment subunit adjusts the power of the second branch optical signal.
  • the first electro-optic modulation sub-unit receives the first pre-compensated electrical signal and modulates the first branch optical signal according to the first pre-compensated electrical signal to generate a first a modulation signal
  • the second electro-optic modulation sub-unit receiving the second pre-compensated electrical signal and modulating the second branch optical signal according to the second pre-compensated electrical signal to generate a second modulated signal.
  • the combining unit combines the first modulated signal and the second modulated signal into one modulated signal.
  • a person of ordinary skill in the art may transmit a test signal at a certain distance when the data is transmitted to a certain distance by using the dispersion compensation transmitter of the embodiment of the present invention, and then receive the test signal at the specific distance, and measure the signal.
  • the bit error rate adjusts the optical power adjustment unit of the dispersion compensation transmitter provided by the embodiment of the present invention to minimize the bit error rate, thereby obtaining the power adjustment value of the optical power adjustment unit when the specific distance is transmitted.
  • the optical power adjustment unit of the dispersion compensation transmitter provided by the embodiment of the present invention can be adjusted accordingly to utilize the obtained optical power adjustment unit power adjustment value to transmit normal data to the location of the specific distance.
  • the general technician can also find the correspondence relationship between the dispersion compensation distance and the power adjustment value of the optical power adjustment unit under the minimum error rate according to the past experience value, thereby obtaining the power adjustment value of the optical power adjustment unit corresponding to a certain distance. Then, the optical power adjustment unit of the dispersion compensation transmitter provided by the embodiment of the present invention can be adjusted correspondingly to obtain the normal data to the location of the specific distance.
  • Figure 10 is a graph showing the correspondence between the dispersion compensation distance and the power of the first modulation signal component and the second modulation signal component in the modulated signal after reaching the dispersion pre-compensation distance to be transmitted, respectively, from the empirically estimated error rate minimum.
  • the vertical axis of the curve connected above the square line in the figure is the power of the first modulated signal component in the modulated signal after reaching the dispersion pre-compensation distance to be transmitted.
  • the vertical axis of the triangle connected below is the modulated signal.
  • the power of the second modulated signal component after reaching the dispersion compensation distance to be transmitted, and the horizontal axis is the dispersion compensation distance. From the curve located above, it can be seen that the power value of the first modulated signal component in the modulated signal after reaching the dispersion pre-compensation distance to be transmitted is determined by
  • the 0.016 attenuation of 1200km is 0.01 to 160km.
  • the drive units combine to amplify the power of the output modulated signal.
  • FIG. 11 is a dispersion compensation transmitter according to Embodiment 10 of the present invention.
  • the digital processing unit performs dispersion pre-compensation on the input data and generates a first pre-compensated digital signal and a second pre-compensated digital signal.
  • the first digital-to-analog conversion unit converts the first pre-compensated digital signal into a first pre-compensated electrical signal, and performs power adjustment by the first driving unit to be sent to the electro-optic modulation unit; and the second digital-to-analog conversion unit converts the second pre-compensated digital signal Converted to a second pre-compensated electrical signal.
  • the laser emitting unit emits an optical signal to the branching unit, and the branching unit divides the input optical signal into a first branch optical signal and a second branch optical signal.
  • the optical power adjustment unit adjusts the power of at least one of the first branch optical signal and the second branch optical signal.
  • the first optical power adjustment subunit adjusts the power of the first branch optical signal
  • the second The optical power adjustment subunit adjusts the power of the second branch optical signal.
  • the electro-optic modulation unit receives the first pre-compensated electrical signal and modulates the first branch optical signal according to the first pre-compensated electrical signal to generate a first modulated signal, and receives a second pre-compensated electrical signal and according to the second pre-compensated electrical signal Modulating the second branch optical signal produces a second modulated signal.
  • the combining unit combines the first modulated signal and the second modulated signal into a modulated signal.
  • the electro-optic modulation unit includes a first electro-optic modulation sub-unit and a second electro-optic modulation sub-unit, and the first electro-optic modulation sub-unit receives the first pre-compensated electrical signal and modulates the first branch optical signal according to the first pre-compensated electrical signal. a first modulated signal, the second electrical light modulation subunit receiving the second pre-compensated electrical signal and modulating the second branched optical signal according to the second pre-compensated electrical signal to generate a second modulated signal.
  • the optical modulation apparatus of Fig. 11 further includes an optical power control subunit in which the optical power adjustment unit power adjustment value corresponding to the different dispersion compensation distances obtained from the empirical values can be stored in advance.
  • the optical power control subunit can automatically adjust the first optical power adjustment subunit and the second optical power adjustment according to the optical power adjustment unit power adjustment value corresponding to the dispersion compensation distance. Subunit.
  • FIG. 12 is a dispersion compensation transmitter according to Embodiment 11 of the present invention.
  • the digital processing unit performs dispersion pre-compensation on the input data and generates a first pre-compensated digital signal and a second pre-compensated digital signal.
  • the first digital-to-analog conversion unit converts the first pre-compensated digital signal into a first pre-compensated electrical signal, and performs power adjustment by the first driving unit to be sent to the electro-optic modulation unit;
  • the second digital-to-analog conversion unit converts the second pre-compensated digital signal into a second pre-compensated electrical signal, and performs power adjustment by the second driving unit to be sent to the electro-optic modulation unit.
  • the laser emitting unit emits an optical signal to the branching unit, and the branching unit divides the input optical signal into a first branch optical signal and a second branch optical signal.
  • the optical power adjustment unit adjusts the power of at least one of the first branch optical signal and the second branch optical signal.
  • the first optical power adjustment subunit adjusts the power of the first branch optical signal
  • the second The optical power adjustment subunit adjusts the power of the second branch optical signal.
  • the electro-optic modulation unit receives the first pre-compensation analog signal and modulates the first branch optical signal according to the first pre-compensated electrical signal to generate a first modulated signal, receives the second pre-compensated electrical signal, and receives the second pre-compensated electrical signal according to the second pre-compensated electrical signal Modulating the second branch optical signal produces a second modulated signal.
  • the combining unit combines the first modulated signal and the second modulated signal into a modulated signal.
  • the electro-optic modulation unit includes a first electro-optic modulation sub-unit and a second electro-optic modulation sub-unit, and the first electro-optic modulation sub-unit receives the first pre-compensated electrical signal and modulates the first branch optical signal according to the first pre-compensated electrical signal. a first modulated signal, the second electrical light modulation subunit receiving the second pre-compensated electrical signal and modulating the second branched optical signal according to the second pre-compensated electrical signal to generate a second modulated signal.
  • the power of the branch optical signal By adjusting the power of the branch optical signal, it is possible to adjust the bottleneck caused by the gain bandwidth product limitation of the modulated device output from the combining unit. Since the bandwidth of the optical device is wider than that of the electrical device, a wide frequency band and a high gain can be realized, and the modulation efficiency of the light is determined by the electro-optical effect, and the power adjustment is relatively easy, and the power of the modulated signal of the output can be more accurately realized. Adjustment.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
  • Optical Communication System (AREA)

Abstract

La présente invention concerne un appareil de modulation optique, un procédé de modulation optique et un émetteur de compensation de dispersion. L’appareil de modulation optique comprend : une unité de séparation, qui sert à séparer un signal optique en un premier et un second signal optique de dérivation et les émettre ; et une unité de réglage de puissance optique qui permet de régler la puissance d’au moins un signal optique de dérivation du premier signal optique de dérivation et du second signal optique de dérivation émis de l’unité de séparation et émet le signal optique réglé ; une unité de modulation électro-optique, qui sert à recevoir des signaux électroniques de pré-compensation d’entrée et à moduler le premier et le second signal optique de dérivation selon les signaux électroniques de pré-compensation et à générer le premier et le second signal modulé ; une unité de combinaison qui est utilisée pour synthétiser le premier et le second signal modulé en un signal modulé.
PCT/CN2009/071401 2008-05-05 2009-04-22 Procédé et appareil de modulation optique, émetteur de compensation de dispersion WO2009135413A1 (fr)

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CN 200810067053 CN101577589B (zh) 2008-05-05 2008-05-05 一种光调制装置、方法和色散预补偿发射机

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CN104702553B (zh) * 2013-12-06 2018-10-19 华为技术有限公司 一种信号处理方法及装置
US9590730B2 (en) 2014-10-01 2017-03-07 Futurewei Technologies, Inc. Optical transmitter with optical receiver-specific dispersion pre-compensation
CN113625474A (zh) * 2020-05-06 2021-11-09 中兴通讯股份有限公司 电光调制器及其系统
CN115941056B (zh) * 2023-03-15 2023-05-05 北京航空航天大学 基于微波光子的正交调制方法及装置
CN116886200B (zh) * 2023-07-27 2024-06-11 济南安迅科技有限公司 一种光通信设备以及光通信方法

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