CN112904722B - Optical modulator parameter control system and method based on integral front end - Google Patents
Optical modulator parameter control system and method based on integral front end Download PDFInfo
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- G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
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Abstract
The invention discloses an optical modulator parameter control system and method based on an integral front end, and belongs to the field of photoelectric chip design. The system comprises a driver, a voltage/current conversion module, a first switched capacitor integrator, an optical modulator, a photoelectric conversion module, a second switched capacitor integrator, a resolver, a control unit and an actuator. The first switched capacitor integrator generates a voltage signal representing the statistical distribution of the modulation data according to the modulation data in the current format, the second switched capacitor integrator generates a voltage signal containing the optical parameter change of the optical modulator and the statistical distribution of the modulation data according to the detected current signal obtained by converting the optical parameters of the optical modulator, and the control signals are calculated by the first switched capacitor integrator and the second switched capacitor integrator, so that the optical parameters of the optical modulator can be tuned through the actuator. The invention overcomes the problems of special data sequence, large power consumption and large chip area in the traditional method.
Description
Technical Field
The invention belongs to the field of photoelectric chip design, and particularly relates to an optical modulator parameter control system and method based on an integral front end.
Background
The optical modulator has the advantages of high transmission rate, low energy consumption, easy large-scale integration and the like, and has wide application in the fields of data centers, wireless communication and the like. In order to prevent the optical parameters of the optical modulator from being changed due to the influence of temperature variation, manufacturing process variation, input laser variation and the like, a control system is usually introduced to detect and lock the optical parameters. For the pulse amplitude modulation format, the optical parameters of the optical modulator will change with the modulation data at high frequency, and a preprocessing or data detection system is usually introduced to cooperate with a parameter control system to control and optimize the modulation performance.
For example, the Ring Modulator (RM) is susceptible to shift in the resonance wavelength due to temperature variation, manufacturing process variation, and input laser variation, resulting in deterioration of its modulation performance. US10651933B1 discloses a closed-loop feedback control system using a photodiode, a control unit and a thermal modulator, which implements detection of light intensity at a download port of the ring modulator by the photodiode, wherein preprocessing of modulation data is implemented by inserting test data, then a control signal is generated by the control unit according to a photocurrent output from the photodiode, and finally the ring modulator is controlled by the thermal modulator. Chinese patent No. CN2017110298491 also discloses a preprocessing technique for precoding modulation data, so as to cooperate with a closed-loop feedback control system to realize control and locking of the resonant wavelength of the ring modulator. In both of the two closed-loop feedback control systems for the ring modulator, since the high-speed modulation data needs to be preprocessed to generate a specific modulation data sequence, the operating frequency of the preprocessing module needs to be matched with the modulation data rate, so that the effective modulation data rate can be reduced, and the data transmission requirements of the high-bandwidth, low-power consumption and random data sequence cannot be well met.
In addition, the mode of detecting the modulation data sequence can realize the closed-loop feedback control of the optical parameters of the optical modulator while transmitting the random data sequence, but the detection of the high-speed modulation data sequence in the existing work usually needs a high-speed detection module, the working speed of the high-speed detection module is usually limited by a process node, and the existing high-speed modulation data detection method also needs a specific modulation data sequence, so that the requirements of high bandwidth, low power consumption and the random data sequence in the actual data transmission process can not be well met.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an optical modulator parameter control system and method based on an integral front end, and aims to solve the problem of bottleneck in the existing optical modulator parameter closed-loop locking method based on preprocessing and data detection.
In order to achieve the above object, an aspect of the present invention provides an optical modulator parameter control system based on an integration front end, including a driver, a voltage/current conversion module, a first switched capacitor integrator, an optical modulator, a photoelectric conversion module, a second switched capacitor integrator, a resolver, a control unit, and an actuator, where an output end of the voltage/current conversion module is connected to the first switched capacitor integrator, and the first switched capacitor integrator is configured to generate a voltage signal representing statistical distribution of modulation data according to modulation data input by an input end of the voltage/current conversion module; the output end of the driver is connected with the optical modulator, the output end of the optical modulator is connected with the input end of the photoelectric conversion module, the output end of the photoelectric conversion module is connected with a second switched capacitor integrator, and the second switched capacitor integrator is used for generating a voltage signal representing optical parameter change and modulation data statistical distribution of the optical modulator; the voltage signals output by the first switched capacitor integrator and the second switched capacitor integrator are transmitted to the resolver, the output end of the resolver is connected with the control unit, the output of the control unit is connected with the actuator, the control unit is used for obtaining control signals through preset control, and the actuator is used for tuning optical parameters of the optical modulator according to the control signals.
Furthermore, the first switched capacitor integrator and the second switched capacitor integrator realize integration of the input current signal in the same integration interval by controlling the on-off of the switch, and finally output a voltage signal obtained by integration.
Furthermore, the system uses a single-path or multi-path switched capacitor integrator to realize the integration of the input current signal and finally output a single or a plurality of voltage signals.
Further preferably, the system uses an optical modulator array, the output end of the voltage/current conversion module is connected with a first switched capacitor integrator, and the first switched capacitor integrator is used for generating a voltage signal representing the statistical distribution of the modulation data according to a plurality of modulation data input by the input end of the voltage/current conversion module; the output end of the driver array is connected with the optical modulator array, the output end of the optical modulator array is connected with the input end of the photoelectric conversion module array, the output end of the photoelectric conversion module array is connected with a second switched capacitor integrator, and the second switched capacitor integrator is used for generating voltage signals representing optical parameter changes of the optical modulator array and statistical distribution of modulation data; the voltage signals output by the first switched capacitor integrator and the second switched capacitor integrator are transmitted to the resolver, the output end of the resolver is connected with the control unit, the output of the control unit is connected with the actuator array, the control unit is used for obtaining control signals through preset control, and the actuator array is used for tuning optical parameters of the optical modulator array according to the control signals.
According to another aspect of the present invention, there is provided an optical modulator parameter control method based on an integration front end, comprising the steps of:
converting the modulation data in the voltage format into a current format, and inputting the current format to a first switched capacitor integrator, wherein the first switched capacitor integrator generates a voltage signal representing the statistical distribution of the modulation data according to the modulation data in the current format;
the optical parameters of the optical modulator driven by the driver loaded with the modulation data are changed along with the modulation data, the optical parameters of the optical modulator are detected and converted into current signals, and the second switched capacitor integrator generates voltage signals containing optical parameter changes of the optical modulator and statistical distribution of the modulation data according to the converted current signals;
calculating a digital signal which is irrelevant to a modulation data sequence and only relevant to the optical parameter of the optical modulator according to voltage signals output by the first switched capacitor integrator and the second switched capacitor integrator, and obtaining a control signal through preset control;
the actuator realizes the tuning of the optical parameters of the optical modulator according to the control signal.
The voltage format modulation data is converted into the current format through the voltage control switch.
Through the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the system and the method for controlling the parameters of the optical modulator based on the integration front end can obtain the statistical distribution of modulation data through the first switched capacitor integrator and the voltage/current conversion module, and calculate the digital signal which is related to the optical parameter change of the optical modulator and is unrelated to the data sequence by combining the voltage signal which is obtained by the second switched capacitor integrator and the photoelectric conversion module and contains the optical parameter change and the data statistical distribution of the optical modulator, thereby overcoming the problem that the traditional method needs a special data sequence.
2. The system and the method for controlling the closed-loop feedback of the parameters of the optical modulator based on the integration front end comprise a voltage/current conversion module, a first switched capacitor integrator, an optical modulator, a photoelectric conversion module, a second switched capacitor integrator, a resolver, a control unit and an actuator which are all in a low-speed working state, so that the problem of high power consumption in the traditional method is solved.
3. The system and the method for controlling the parameters of the optical modulator based on the integration front end can realize the effective control of the optical modulator array through the multiplexing core control module, thereby overcoming the problem of large chip area in the traditional method.
Drawings
FIG. 1 is a schematic diagram of a closed-loop feedback control method for optical modulator parameters based on an integration front-end;
FIG. 2 is a schematic diagram along the voltage/current conversion module of FIG. 1;
FIG. 3(a) is a schematic diagram of a single-pass implementation along the switched capacitor integrator of FIG. 1;
FIG. 3(b) is a schematic diagram of a two-way implementation along the switched capacitor integrator of FIG. 1;
FIG. 4 is a schematic diagram of resonant wavelength closed loop locking of a ring modulator based on a single switched capacitor integrator and detecting a pass-through/drop port;
FIG. 5 is a schematic diagram of resonant wavelength closed loop locking of a ring modulator based on a two-way switched capacitor integrator and detecting a pass-through/download port;
FIG. 6 is a schematic diagram of the resonant wavelength closed loop locking of a ring modulator array based on a multiplexer/demultiplexer, a one/two way switched capacitor integrator and a photodiode array at the through/download port;
FIG. 7 is a schematic diagram of the bias point closed loop locking of a Mach-Zehnder modulator based on a single-path switched-capacitor integrator;
FIG. 8 is a schematic diagram of bias point closed loop locking for a Mach-Zehnder modulator based on a two-way switched-capacitor integrator;
FIG. 9 is a schematic diagram of the bias point closed loop locking for a Mach-Zehnder modulator array based on a multiplexer/demultiplexer, a one/two-way switched capacitor integrator, and a photodiode array.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention provides an optical modulator parameter control system based on an integration front end, which comprises a driver, a voltage/current conversion module, a first switched capacitor integrator, an optical modulator, a photoelectric conversion module, a second switched capacitor integrator, a resolver, a control unit and an actuator, wherein the output end of the voltage/current conversion module is connected with the first switched capacitor integrator, and the first switched capacitor integrator is used for generating a voltage signal representing the statistical distribution of modulation data according to the modulation data input by the input end of the voltage/current conversion module; the output end of the driver is connected with the optical modulator, the output end of the optical modulator is connected with the input end of the photoelectric conversion module, the output end of the photoelectric conversion module is connected with a second switched capacitor integrator, and the second switched capacitor integrator is used for generating a voltage signal representing optical parameter change and modulation data statistical distribution of the optical modulator; the voltage signals output by the first switched capacitor integrator and the second switched capacitor integrator are transmitted to the resolver, the output end of the resolver is connected with the control unit, the output of the control unit is connected with the actuator, the control unit is used for obtaining control signals through preset control, and the actuator is used for tuning optical parameters of the optical modulator according to the control signals.
Specifically, the first switched capacitor integrator and the second switched capacitor integrator realize integration of the input current signal in the same integration interval by controlling the on-off of the switch, and finally output a voltage signal obtained by integration.
Specifically, the system uses a single-path or multi-path switched capacitor integrator to realize the integration of the input current signal and finally output a single or a plurality of voltage signals.
Specifically, the system uses an optical modulator array, the output end of a voltage/current conversion module is connected with a first switched capacitor integrator, and the first switched capacitor integrator is used for generating a voltage signal representing the statistical distribution of modulation data according to a plurality of modulation data input by the input end of the voltage/current conversion module; the output end of the driver array is connected with the optical modulator array, the output end of the optical modulator array is connected with the input end of the photoelectric conversion module array, the output end of the photoelectric conversion module array is connected with a second switched capacitor integrator, and the second switched capacitor integrator is used for generating voltage signals representing optical parameter changes of the optical modulator array and statistical distribution of modulation data; the voltage signals output by the first switched capacitor integrator and the second switched capacitor integrator are transmitted to the resolver, the output end of the resolver is connected with the control unit, the output of the control unit is connected with the actuator array, the control unit is used for obtaining control signals through preset control, and the actuator is used for tuning optical parameters of the optical modulator array according to the control signals.
The invention also provides an optical modulator parameter control method based on the integration front end, as shown in fig. 1, comprising the following steps:
converting the modulation data in the voltage format into a current format, and inputting the current format to a first switched capacitor integrator, wherein the first switched capacitor integrator generates a voltage signal representing the statistical distribution of the modulation data according to the modulation data in the current format;
the optical parameters of the optical modulator driven by the driver loaded with the modulation data are changed along with the modulation data, the optical parameters of the optical modulator are detected and converted into current signals, and the second switched capacitor integrator generates voltage signals containing optical parameter changes of the optical modulator and statistical distribution of the modulation data according to the converted current signals;
calculating a digital signal which is irrelevant to a modulation data sequence and only relevant to the optical parameter of the optical modulator according to voltage signals output by the first switched capacitor integrator and the second switched capacitor integrator, and obtaining a control signal through preset control;
the actuator realizes the tuning of the optical parameters of the optical modulator according to the control signal.
As shown in fig. 2, the voltage/current conversion module of the present invention can be implemented by a simple voltage control switch, and can detect high-speed modulation data, thereby meeting the application requirement of high detection bandwidth. As shown in fig. 3(a) and fig. 3(b), the switching rate of the switched capacitor integrator can be much lower than the data rate, and the operating frequency is lower than that of the detection front end based on the transimpedance amplifier, so as to meet the application requirement of low power consumption. The resolver can control the integration interval of the switched capacitor integrators, and simultaneous equations are solved according to the detection of the outputs of the first switched capacitor integrator and the second switched capacitor integrator, so that the application requirement of the random modulation data sequence is met.
The actuator in the invention can realize the tuning of the optical parameters of the optical modulator through thermo-optic effect, electro-optic effect, mechanical force and the like.
The invention provides a system and a method for controlling optical modulator parameters based on an integral front end in the application of optical parameter control of a ring modulator and a Mach-Zehnder modulator. Figures 4-6 illustrate four embodiments one through four of the ring modulator parameter control system based on an integration front end.
Example one
Firstly, a driver drives the resonance wavelength of a ring modulator to change according to modulation data;
step two, the photodiode detects the light intensity at the through/download port of the ring modulator and outputs corresponding current;
step three, outputting an integration control signal by the resolver to enable the length of the switch capacitance integration interval to be N1;
integrating the input current signal by a second switched capacitor integrator;
step five, the voltage/current conversion module converts the modulation data into a changed current signal;
step six, integrating the input current signal by a first switched capacitor integrator;
step seven, the resolver stores the output voltages of the first switched capacitor integrator and the second switched capacitor integrator at the moment;
step eight, detecting whether the integration interval is N1, if so, adjusting the switched capacitor integration interval to be N2 and repeating the step four to the step seven, and if so, going to the next step;
step nine, the resolver calculates digital signals capable of representing resonance wavelengths under different modulation signals according to output voltages of the first switched capacitor integrator module and the second switched capacitor integrator when integration intervals are respectively N1 and N2 and a simultaneous equation set;
step ten, according to the digital signal which is calculated by the resolver and can represent the resonance wavelength, the control algorithm unit calculates a proper digital signal according to a maximum locking algorithm and outputs the proper digital signal to the heat regulator for driving;
eleventh, the heat regulator is driven to generate heat so as to change the resonance wavelength of the ring resonator;
and step twelve, if the optical modulation amplitude does not reach the maximum value, repeating the step two to the step eleven.
Example two
Firstly, a driver drives the resonance wavelength of a ring modulator to change according to modulation data;
step two, the photodiode detects the light intensity at the through/download port of the ring modulator and outputs corresponding current;
step three, outputting an integration control signal by the resolver to enable the length of the switch capacitance integration interval to be N1 and N2;
integrating the input current signal by a second switched capacitor integrator;
step five, the voltage/current conversion module converts the modulation data into a changed current signal;
step six, integrating the input current signal by a first switched capacitor integrator;
step seven, the resolver stores four output voltages of the first switched capacitor integrator and the second switched capacitor integrator at the moment;
step eight, the resolver calculates digital signals capable of representing resonance wavelengths under different modulation signals according to output voltages integrated by the first switched capacitor integrator and the second switched capacitor integrator when the integration intervals are respectively N1 and N2 and by simultaneous equation sets;
step nine, according to the digital signals which can represent the resonance wavelength and are calculated by the resolver, the control algorithm unit calculates proper digital signals according to a maximum locking algorithm and outputs the proper digital signals to the heat regulator for driving;
step ten, the heat adjuster drives to generate heat so as to change the resonance wavelength of the ring resonator;
and step eleven, if the optical modulation amplitude does not reach the maximum value, repeating the step two to the step ten.
EXAMPLE III
Step one, a photocurrent output multiplexer, a modulation data output multiplexer and a thermal modulator drive demultiplexer to be switched to a first ring modulator in a ring modulator array;
secondly, the driver drives the resonance wavelength of the annular modulator to change according to the modulation data;
thirdly, the photodiode detects the light intensity at the through/download port of the annular modulator and outputs corresponding current;
step four, outputting an integration control signal by the resolver to enable the length of the switch capacitance integration interval to be N1;
integrating the input current signal by a second switched capacitor integrator;
step six, the voltage \ current conversion module converts the modulation data into a changed current signal;
step seven, integrating the input current signal by the first switched capacitor integrator;
step eight, the resolver stores the output voltages of the first switched capacitor integrator and the second switched capacitor integrator at the moment;
step nine, detecting whether the integration interval is N1, if so, adjusting the switched capacitor integration interval to be N2 and repeating the step four to the step eight, and if so, going to the next step;
step ten, the resolver calculates digital signals which can represent resonance wavelengths under different modulation signals according to output voltages of the first switched capacitor integrator module and the second switched capacitor integrator when integration intervals are respectively N1 and N2 and a simultaneous equation set;
step eleven, according to the digital signal which is calculated by the resolver and can represent the resonance wavelength, the control algorithm unit calculates a proper digital signal according to a maximum locking algorithm and outputs the proper digital signal to the heat regulator for driving;
step twelve, the heat regulator drives and produces heat in order to change the resonant wavelength of the ring resonator;
thirteen, if the optical modulation amplitude does not reach the maximum value, repeating the third step to the twelfth step;
and step fourteen, switching the photocurrent output multiplexer, the modulation data output multiplexer and the thermal modulator driving demultiplexer to the next ring modulator, and repeating the steps two to thirteen until the last ring modulator.
Example four
Step one, a photocurrent output multiplexer, a modulation data output multiplexer and a thermal modulator drive demultiplexer to be switched to a first ring modulator in a ring modulator array;
secondly, the driver drives the resonance wavelength of the annular modulator to change according to the modulation data;
thirdly, the photodiode detects the light intensity at the download port/through port of the annular modulator and outputs corresponding current;
step four, outputting an integration control signal by the resolver to enable the length of the switch capacitance integration interval to be N1 and N2;
integrating the input current signal by a second switched capacitor integrator;
step six, the voltage/current conversion module converts the modulation data into a changed current signal;
step seven, integrating the input current signal by the first switched capacitor integrator;
step eight, the resolver stores four output voltages of the first switched capacitor integrator and the second switched capacitor integrator at the moment;
step nine, the resolver calculates digital signals capable of representing resonance wavelengths under different modulation signals according to output voltages of the first switched capacitor integrator and the second switched capacitor integrator when integration intervals are respectively N1 and N2 and a simultaneous equation set;
step ten, according to the digital signal which is calculated by the resolver and can represent the resonance wavelength, the control algorithm unit calculates a proper digital signal according to a maximum locking algorithm and outputs the proper digital signal to the heat regulator for driving;
eleventh, the heat regulator is driven to generate heat so as to change the resonance wavelength of the ring resonator;
step twelve, if the optical modulation amplitude does not reach the maximum value, repeating the step three to the step eleven;
and step thirteen, switching the photocurrent output multiplexer, the modulation data output multiplexer and the thermal modulator driving demultiplexer to the next ring modulator, and repeating the steps two to twelve until the last ring modulator.
Fig. 7-9 show four embodiments of mach-zehnder modulator parameter control systems based on an integration front-end, five to eight.
EXAMPLE five
Firstly, a driver drives a bias point of a Mach-Zehnder modulator to change according to modulation data;
step two, the photodiode detects the light intensity in the Mach-Zehnder modulator and outputs corresponding current;
step three, outputting an integration control signal by the resolver to enable the length of the switch capacitance integration interval to be N1;
integrating the input current signal by a second switched capacitor integrator;
step five, the voltage/current conversion module converts the modulation data into a changed current signal;
step six, integrating the input current signal by a first switched capacitor integrator;
step seven, the resolver stores the output voltages of the first switched capacitor integrator and the second switched capacitor integrator at the moment;
step eight, detecting whether the integration interval is N1, if so, adjusting the switched capacitor integration interval to be N2 and repeating the step four to the step seven, and if so, going to the next step;
step nine, the resolver calculates digital signals capable of representing the bias points under different modulation signals according to output voltages of the first switched capacitor integrator module and the second switched capacitor integrator when the integration intervals are respectively N1 and N2 and a simultaneous equation set;
step ten, according to the digital signal which is calculated by the resolver and can represent the bias point, the control unit calculates a proper digital signal according to a most value locking algorithm and outputs the proper digital signal to the driving of the heat regulator;
eleventh, the heat regulator is driven to generate heat so as to change the resonance wavelength of the ring resonator;
and step twelve, if the optical modulation amplitude does not reach the maximum value, repeating the step two to the step eleven.
EXAMPLE six
Firstly, a driver drives a bias point of a Mach-Zehnder modulator to change according to modulation data;
step two, the photodiode detects the light intensity in the Mach-Zehnder modulator and outputs corresponding current;
step three, outputting an integration control signal by the resolver to enable the length of the switch capacitance integration interval to be N1 and N2;
integrating the input current signal by a second switched capacitor integrator;
step five, the voltage/current conversion module converts the modulation data into a changed current signal;
step six, integrating the input current signal by a first switched capacitor integrator;
step seven, the resolver stores four output voltages of the first switched capacitor integrator and the second switched capacitor integrator at the moment;
step eight, the resolver calculates digital signals capable of representing resonance wavelengths under different modulation signals according to output voltages integrated by the first switched capacitor integrator and the second switched capacitor integrator when the integration intervals are respectively N1 and N2 and by simultaneous equation sets;
step nine, according to the digital signals which can represent the bias points and are calculated by the resolver, the control unit calculates proper digital signals according to a most value locking algorithm and outputs the proper digital signals to the heat regulator for driving;
step ten, the heat regulator drives to generate heat so as to change the bias point of the Mach-Zehnder modulator;
and step eleven, if the optical modulation amplitude does not reach the maximum value, repeating the step two to the step ten.
EXAMPLE seven
Step one, a photocurrent output multiplexer, a modulation data output multiplexer and a heat modulator drive demultiplexer to be switched to a first Mach-Zehnder modulator in a Mach-Zehnder modulator array;
secondly, the driver drives the bias point of the Mach-Zehnder modulator to change according to the modulation data;
thirdly, the photodiode detects the light intensity in the Mach-Zehnder modulator and outputs corresponding current;
step four, outputting an integration control signal by the resolver to enable the length of the switch capacitance integration interval to be N1;
integrating the input current signal by a second switched capacitor integrator;
step six, the voltage/current conversion module converts the modulation data into a changed current signal;
step seven, integrating the input current signal by the first switched capacitor integrator;
step eight, the resolver stores the output voltages of the first switched capacitor integrator and the second switched capacitor integrator at the moment;
step nine, detecting whether the integration interval is N1, if so, adjusting the switched capacitor integration interval to be N2 and repeating the step four to the step eight, and if so, going to the next step;
step ten, the resolver calculates digital signals capable of representing the bias points under different modulation signals according to output voltages of the first switched capacitor integrator module and the second switched capacitor integrator when integration intervals are respectively N1 and N2 and a simultaneous equation set;
step eleven, according to the digital signals which can represent the bias points and are calculated by the resolver, the control algorithm unit calculates proper digital signals according to a maximum locking algorithm and outputs the proper digital signals to the heat regulator for driving;
step twelve, the heat regulator drives to generate heat so as to change the bias point of the Mach-Zehnder modulator;
thirteen, if the optical modulation amplitude does not reach the maximum value, repeating the third step to the twelfth step;
and step fourteen, switching the photocurrent output multiplexer, the modulation data output multiplexer and the thermal modulator driving demultiplexer to the next Mach-Zehnder modulator, and repeating the steps two to thirteen until the last Mach-Zehnder modulator.
Example eight
Step one, a photocurrent output multiplexer, a modulation data output multiplexer and a heat modulator drive demultiplexer to be switched to a first Mach-Zehnder modulator in a Mach-Zehnder modulator array;
secondly, the driver drives the bias point of the Mach-Zehnder modulator to change according to the modulation data;
thirdly, the photodiode detects the light intensity in the Mach-Zehnder modulator and outputs corresponding current;
step four, outputting an integration control signal by the resolver to enable the length of the switch capacitance integration interval to be N1 and N2;
integrating the input current signal by a second switched capacitor integrator;
step six, the voltage/current conversion module converts the modulation data into a changed current signal;
step seven, integrating the input current signal by the first switched capacitor integrator;
step eight, the resolver stores four output voltages of the first switched capacitor integrator and the second switched capacitor integrator at the moment;
step nine, the resolver calculates digital signals capable of representing the bias points under different modulation signals according to output voltages of the first switched capacitor integrator and the second switched capacitor integrator when the integration intervals are respectively N1 and N2 and a simultaneous equation set;
step ten, according to the digital signal which is calculated by the resolver and can represent the bias point, the control algorithm unit calculates a proper digital signal according to a maximum locking algorithm and outputs the proper digital signal to the heat regulator for driving;
eleventh, the heat regulator is driven to generate heat so as to change the bias point of the Mach-Zehnder modulator;
step twelve, if the optical modulation amplitude does not reach the maximum value, repeating the step three to the step eleven;
and step thirteen, switching the photocurrent output multiplexer, the modulation data output multiplexer and the thermal modulator driving demultiplexer to the next Mach-Zehnder modulator, and repeating the steps from two to twelve until the last Mach-Zehnder modulator.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. An optical modulator parameter control system based on an integration front end is characterized by comprising a driver, a voltage/current conversion module, a first switched capacitor integrator, an optical modulator, a photoelectric conversion module, a second switched capacitor integrator, a resolver, a control unit and an actuator, wherein the output end of the voltage/current conversion module is connected with the first switched capacitor integrator, and the first switched capacitor integrator is used for generating a voltage signal representing the statistical distribution of modulation data according to the modulation data input by the input end of the voltage/current conversion module; the output end of the driver is connected with the optical modulator, the output end of the optical modulator is connected with the input end of the photoelectric conversion module, the output end of the photoelectric conversion module is connected with the second switched capacitor integrator, and the second switched capacitor integrator is used for generating a voltage signal representing optical parameter change and modulation data statistical distribution of the optical modulator; and voltage signals output by the first switched capacitor integrator and the second switched capacitor integrator are transmitted to the resolver, the output end of the resolver is connected with the control unit, the output of the control unit is connected with the actuator, and the actuator is used for tuning the optical parameters of the optical modulator according to the control signals output by the control unit.
2. The control system of claim 1, wherein the first switched capacitor integrator and the second switched capacitor integrator realize integration of the input current signal within the same integration interval by controlling on and off of a switch, and finally output a voltage signal obtained by integration.
3. The control system of claim 1, wherein the system uses a single or multiple switched capacitor integrator to integrate the input current signal and ultimately output a single or multiple voltage signals.
4. The control system of claim 1, wherein the system uses an array of optical modulators, the output of the voltage/current conversion module is connected to the first switched capacitor integrator, the first switched capacitor integrator is configured to generate a voltage signal representing a statistical distribution of modulation data based on a plurality of modulation data input at the input of the voltage/current conversion module; the output end of the driver array is connected with the optical modulator array, the output end of the optical modulator array is connected with the input end of the photoelectric conversion module array, the output end of the photoelectric conversion module array is connected with the second switched capacitor integrator, and the second switched capacitor integrator is used for generating voltage signals representing optical parameter changes of the optical modulator array and statistical distribution of modulation data; and voltage signals output by the first switched capacitor integrator and the second switched capacitor integrator are transmitted to the resolver, the output end of the resolver is connected with the control unit, the output of the control unit is connected with the actuator array, and the actuator array is used for tuning the optical parameters of the optical modulator array according to the control signals output by the control unit.
5. An optical modulator parameter control method based on an integration front end is characterized by comprising the following steps:
converting the modulation data in the voltage format into a current format, and inputting the current format to a first switched capacitor integrator, wherein the first switched capacitor integrator generates a voltage signal representing the statistical distribution of the modulation data according to the modulation data in the current format;
the optical parameters of the optical modulator driven by the driver loaded with the modulation data are changed along with the modulation data, the optical parameters of the optical modulator are detected and converted into current signals, and the second switched capacitor integrator generates voltage signals containing optical parameter changes of the optical modulator and statistical distribution of the modulation data according to the converted current signals;
calculating a digital signal which is irrelevant to a modulation data sequence and only relevant to optical parameters of the optical modulator according to voltage signals output by the first switched capacitor integrator and the second switched capacitor integrator, and obtaining a control signal through a maximum locking algorithm;
the actuator realizes the tuning of the optical parameters of the optical modulator according to the control signal.
6. The control method of claim 5, wherein the converting the voltage formatted modulated data to the current formatted is accomplished by a voltage controlled switch.
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