CN110417475B - System and method for non-stray locking of bias point of electro-optic conversion module - Google Patents
System and method for non-stray locking of bias point of electro-optic conversion module Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
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- H—ELECTRICITY
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- 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
- H04B10/5057—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output
- H04B10/50575—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output to control the modulator DC bias
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Abstract
The invention relates to a spurious-free locking system and a spurious-free locking method for an electric-optical conversion module bias point, which are used for realizing spurious-free stable control and tracking of the electric-optical conversion module bias point, extracting optical power of an optical transmitting part and an electric-optical conversion part and carrying out logic feedback control so as to realize spurious-free modulator working point stable control. Compared with the control mode of the traditional power method and the pilot frequency method, the method ensures that stray is not introduced on the optical intrinsic signal, ensures that the signal has higher purity, ensures the precision of a control point, and does not introduce errors along with the change of the performance of the light source.
Description
Technical Field
The invention relates to the field of optical communication, microwave photonics and radio-over-fiber (ROF), in particular to a system and a method for spurious-free locking of a bias point of an electro-optic conversion module.
Background
With the continuous development of optical communication and microwave photonics and the increasing maturity of optoelectronic device manufacturing technologies, a great deal of data and information is transmitted by light. The electro-optical conversion module mainly functions to convert a modulated electrical signal into a modulated optical signal. The basic structure of the prior art electro-optic conversion module comprises a light emitting part, an electro-optic conversion part and a logic control unit. A light emitting section mainly composed of a laser as a light source and a backlight detector for detecting the optical power of the laser; the electric-optical conversion part mainly comprises a modulator used for electric-optical conversion and a detection detector used for detecting the output optical power of the modulator; the logic control unit mainly functions to logically control the light emitting section and the electro-optical conversion section.
The optical modulator is used as a core device for realizing the electro-optical conversion, and the optical modulator can work in a stable modulation interval only by locking to an orthogonal bias point, so that correct, high-quality and low-distortion optical signals are realized. Under the orthogonal bias point, the signal intensity of the electro-optic conversion fundamental mode is maximum, the signal intensity of the 2-order is minimum, and the proportion reaches the maximum value. However, after the modulator, especially the lithium niobate modulator, is biased at the working point, the modulation curve may still drift along with external stress, temperature, charge accumulation and other factors, which affects the accuracy and stability of the whole electro-optic conversion module.
The existing control method of the logic control unit mainly comprises a power method and a pilot frequency method. For example, US8160456 discloses a power control method for stable control of a modulator by detecting the output power of the modulator through algorithmic recording, but this method cannot avoid errors introduced by aging of a modulator section or power variation of a light emitting section. Chinese patent CN104639252 and US patent US8175465 disclose a method for controlling a modulator by using a pilot method, mainly by externally generating a low frequency modulation (diter) signal and loading the signal into the modulator, and then extracting the signal by using a detection detector and performing logic real-time control. The pilot method can avoid errors caused by changes of the optical emission part, but stray signals are introduced due to the addition of low-frequency modulation signals, so that the purity and the precision of the modulation signals are affected.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a spurious-free locking system and a spurious-free locking method for an electric-optical conversion module bias point, which are used for realizing spurious-free stable control and tracking of the electric-optical conversion module bias point, extracting the optical power of an optical transmitting part and an electric-optical conversion part and carrying out logic feedback control so as to realize spurious-free modulator working point stable control.
The invention provides a stray-free locking system of a bias point of an electro-optic conversion module in a first aspect, which comprises: a light emission driving section, a logic processing section, and an electro-optic conversion driving section. The light emission driving part is connected with the light emission part of the electro-optic conversion module to realize the driving of the light emission part; the electric-optical conversion driving part is mainly connected with the electric-optical conversion part in the electric-optical conversion module to realize the driving of the electric-optical conversion part; and a logic processing part for performing real-time feedback control according to the operating states of the light emitting part and the electro-optic conversion part.
Furthermore, the system for non-stray locking of the bias point of the electro-optic conversion module comprises a light emission driving part, a first current detection part and a second current detection part. The laser driving function is to provide the driving current of the laser, and the driving current can be a DA circuit or a related analog circuit; the first current detecting section detects a photo-generated current signal of the backlight detector in the light emitting section, and may be an AD circuit or a related analog circuit.
The logic processing part mainly comprises a microprocessor and a data memory. The microprocessor is used for realizing the logic control of the electro-optic conversion module and can be a programmable logic device such as a singlechip, an FPGA, a CPLD and the like. The data memory mainly realizes the storage of the state data of the electro-optic conversion module.
The electro-optic conversion driving part mainly comprises a second current detection part, a modulator driving part and a jitter generator, wherein the second current detection part is used for realizing the detection of the output power of the modulator and can be an AD (analog-to-digital) or related analog circuit; the modulator driving function is to drive the bias point of the modulator, which may be DA or related analog circuit, and the jitter generator function is to generate a weak low-frequency jitter signal.
The second aspect of the present invention provides a software implementation method for spurious-free locking of bias points of an electro-optical conversion module, including: initialization self-checking, intrinsic parameter table establishment, operating point spurious-free control and control state detection and reconstruction.
The initialization self-test part respectively realizes the function self-test of the light emitting part and the electric-optical conversion part of the electric-optical conversion module, and comprises laser current loading in the light emitting part, modulator voltage scanning in the electric-optical conversion part, backlight detector detection in the light emitting part and detector detection in the electric-optical conversion part.
The intrinsic parameter table is established and used for establishing data tables corresponding to modulator output light power, laser light power, 1-order intensity of detection jitter signals and 2-order intensity of jitter signals along with loading scanning voltage values of the modulator.
The operating point non-stray control means that under the state that the jitter signal is closed, according to the data ratio of a backlight detector in the light emitting part and a detector in the electro-optic conversion part, the bias voltage adjustment amount is calculated through the intrinsic parameter table, the bias voltage of the modulator is corrected, and then the real-time voltage feedback control of the electro-optic conversion module is formed.
The control state detection and reconstruction mainly comprises the steps of detecting whether the working bias voltage of the electro-optic conversion module works at an optimal point in a staged mode, starting a dither signal, detecting the output light power of a modulator, the light power of a laser, the 1-order intensity of the dither signal and the 2-order intensity of the dither signal, comparing parameters with an intrinsic data table, refreshing data if the output light power of the modulator, the light power of the laser, the 1-order intensity of the dither signal and the 2-order intensity of the dither signal exceed a threshold value, and keeping original data unchanged if the output light power of the.
The invention relates to a spurious-free locking system and a spurious-free locking method for a bias point of an electro-optic conversion module, which are used for realizing real-time spurious-free feedback control of the bias point in the electro-optic conversion module. Compared with the control mode of the traditional power method and the pilot frequency method, the method ensures that stray is not introduced on the optical intrinsic signal, ensures that the signal has higher purity, ensures the precision of a control point, and does not introduce errors along with the change of the performance of the light source.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious that the drawings in the following description are some examples of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1: the invention relates to a stray-free locking system for bias point of electro-optic conversion module
FIG. 2: the invention relates to a software implementation method flow chart of stray locking free of an electric-optical conversion module bias point
FIG. 3: the invention relates to an initialization self-checking flow chart of an electric-optical conversion module
FIG. 4: the invention relates to a flow chart for establishing an intrinsic data table of an electro-optic conversion module
FIG. 5: working point spurious-free control flow chart of electric-optical conversion module
FIG. 6: the invention relates to a control state detection and reconstruction flow chart of an electro-optic conversion module
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the embodiment of the invention, in order to enable the bias point of the direct current bias of Mach-Zehnder intensity light modulation in the electro-optic conversion module to be positioned at the orthogonal bias point on the modulation curve and realize stable tracking locking along with the change of external environmental conditions, the corresponding quantity of the bias point on the modulation point curve needs to be found, a corresponding data table is formed, the offset voltage is obtained through calculation, and the offset voltage is superposed to the bias voltage, so that the feedback regulation and control on the orthogonal bias point are realized. To ensure long-term operation stability and signal purity, the corresponding amount of the selected bias point is independent of the output power of the light emitting part and the power of the injected radio frequency signal, and no jitter signal is introduced during bias control.
As shown in fig. 1, the basic structure of a stray-locking free system for bias point of an electro-optic conversion module includes a logic processing portion 1, a light emission driving portion 2, and an electro-optic conversion driving portion 3.
The logic processing part 1 is a core control unit, and feedback control is carried out on the working state of the light emitting and electric-optical conversion part by using a microprocessor 101, such as a singlechip, so as to form a control closed loop; the data memory 102 stores status data of light emission and electro-optic conversion, and mainly stores a corresponding amount data table of the bias point.
The light emission driving section 2 is for forming feedback control for the light emitting section, and includes a laser drive 201 and a first current detection 202. The method has the functions of controlling the injection current of the laser by using the AD and the operational amplifier and detecting the output current of the backlight detector in the light emitting part by using the DA, so that the detection of the output light power of the laser is realized and the stable output of the light power is ensured.
And an electro-optical conversion driving section 3 for forming a feedback closed-loop control of the electro-optical conversion section. The modulator bias voltage is implemented by DA using the modulator driver 302 and is applied to the modulator input via the combiner together with the dither signal generated by the dither generator 303. The second current detection 301 detects the output current of the detector in real time through the AD, and detects the output optical power of the modulator.
The design principle and thought of the spurious-free locking method of the bias point of the electro-optic conversion module is as follows: exemplified by a laser and a Mach-Zehnder modulator, the modulator outputs an optical power PoAnd light emission output optical power PLDHalf wave voltage VπBias voltage VBThe relationship is as follows:
when the external jitter generator 303 loads the perturbation signal and the bias signal of the modulator driver 302, the electro-optically converted optical intensity including the optical intensity P of 0 frequency can be obtained from the second current detection 301o1 order signal strength PmodAnd 2 order signal strength PNL2Comprises the following steps:
from the above formula, through Pmod/ PNL2The method for searching the maximum value can accurately find the orthogonal bias point, realize the high-linearity electric-optical conversion efficiency, and pass through Pmod/ PNL2And a bias voltage VBThe corresponding relation parameter table calculates the corresponding offset voltage VbThen superimposed on the bias voltage VBThe above. However, the method needs to introduce a jitter signal, introduces stray into the modulation spectrum of the modulator, influences the quality and purity of the electro-optic conversion signal, and simultaneously Pmod/ PNL2And modulating the input signal strength VRFRelated to the influence of the regulation essence under the condition of external quantity changeAnd (4) degree.
In the invention, the loaded jitter signal is adopted to accurately find the orthogonal offset point and establish Pmod/ PNL2And Po/PLDAnd a bias voltage VBThe intrinsic relationship table of the three is utilized, and P is utilized under the condition that the jitter signal is closedo/PLDAnd a bias voltage VBCalculating an offset voltage Vb and superimposing it on the bias voltage VBIn the above way, feedback closed-loop regulation of the bias voltage is realized, the purpose of jitter-free feedback regulation is achieved, and stray-free locking of the bias point of the electro-optic conversion module can be realized.
From the formula, Po/PLD=1-cos（πVB/Vπ) Can directly reflect the intrinsic parameters of the modulator and the output light power P of the laserLDAnd an input radio frequency voltage VRFAll are irrelevant, and more accurate feedback regulation and control can be realized.
As shown in fig. 2, a software process for non-spurious locking of bias points of an electro-optic conversion module includes: step 1, initializing self-checking, and carrying out state detection on each part of an electro-optic conversion module; step 2, establishing an intrinsic data table, scanning and acquiring P under the conditions of starting and loading of a jitter signalo、PLD、Pmod、PNL2Establishing a table with the bias voltage; step 3, the working point is controlled without stray, and P is utilized under the state that the jitter signal is closedo/PLDAnd a bias voltage VBThe intrinsic meter forms feedback control on the electro-optic conversion module; and 4, detecting and reconstructing a control state, monitoring whether the control state of the electro-optic conversion module is accurate, and rescanning and establishing the intrinsic data table if the control state of the electro-optic conversion module is changed. And (3) if the eigenvalue is judged to be changed greatly, executing the step (2), and if the eigenvalue is judged to be changed slightly, executing the step (3).
As shown in fig. 3, it is a flow chart of software initialization self-checking for an electro-optical conversion module, and is intended to perform state checking on the working states of a laser, a backlight detector, a modulator, and a detection detector, and determine whether the laser, the backlight detector, the modulator, and the detection detector are working normally. Mainly comprises the following steps: step 1, loading laser current, namely loading preset driving current to the laser by using a laser driver 201 to generate an intrinsic optical signal of an electro-optical conversion module; step 2, detecting the photocurrent of the backlight detector, namely detecting the photocurrent of the backlight detector by using the first current detection 202, and judging whether the laser and the backlight detector work normally; step 3, voltage scanning of the modulator, namely, performing bias voltage scanning on the modulator by using a modulator driver 302; and 4, detecting the photocurrent of the detector by using a second current detector 301, and judging the working states of the modulator and the detector.
As shown in FIG. 4, a flow chart is established for the software intrinsic table of the electro-optic conversion module in order to establish parameters and bias voltage VBCorresponding intrinsic parameter table (iv). The method mainly comprises the following steps: step 1, starting a jitter generator to generate a jitter signal, specifically a jitter signal of 1 kHz, and adjusting a modulator bias voltage VBAre loaded to the input end of the modulator together; step 2, scanning the bias voltage of the modulator, and scanning the bias voltage V of the modulatorBFrom a minimum value to a maximum value; step 3, the second current detection 301 and the first current detection 202 collect data, and collect current values of a backlight detector of the light emitting part and a detection detector of the electric-optical conversion part; step 4, extracting the laser power PLDModulator output power PoA base mode signal Pmod(1 kHz), 2 nd order signal PNL2A value of (2 kHz); step 5, establishing PLD、Po、Pmod、PNL2、Po/PLD、Pmod/PNL2And a bias voltage VBA correspondence table storing the intrinsic data table in the data memory 102.
As shown in FIG. 5, the flow chart of the stray-free control of the operating point of the electro-optic conversion module is to implement the bias point feedback closed-loop control of the electro-optic conversion module and load the calculated offset voltage to the bias voltage VBAnd all the time, the single-phase current transformer is operated at the position of the orthogonal bias point voltage. The method comprises the following specific steps: step 1, a dithering signal is closed, and stray is prevented from being introduced into the signal to influence the signal quality; step 2, setting corresponding bias of the orthogonal bias points according to the intrinsic tableA voltage value, loaded to the modulator by the modulator driver 302; step 3, according to the first current detection 202 and the second current detection 301, detecting the current values of the backlight detector of the light emitting part and the detection detector of the electro-optic conversion part, and obtaining the laser output power P of the light emitting partLDAnd modulator output power PoFurther, the current state ratio P is obtainedo/PLD(ii) a Step 4, obtaining an offset voltage V according to the intrinsic datab(ii) a Step 5, the offset voltage V is adjustedbSuperimposed on a bias voltage VBAnd enabling the modulator to work to a quadrature bias point.
As shown in fig. 6, it is a flowchart of the intrinsic parameter table detection of the electro-optic conversion module, which is used to perform timing detection on the accuracy of the intrinsic parameter table and determine whether to update the intrinsic parameter values in the intrinsic parameter table. The software flow comprises the following steps: step 1, receiving an intrinsic parameter table trigger signal; step 2, starting a jitter generator 303 to generate a jitter signal and loading the jitter signal into a modulator; step 3, extracting the laser power PLDModulator output power PoA base mode signal Pmod2 order signal PNL2And calculating Po/PLDAnd Pmod/PNL2The value of (d); step 4, comparing the data with the data in the intrinsic data table to obtain Po/PLDAnd Pmod/PNL2And comparing the value with the value of the intrinsic parameter table, judging whether the value exceeds a set threshold value, if not, judging that the intrinsic data table does not need to be reestablished, performing the spurious-free control on the working point, and if so, judging that the value needs to be reestablished, and establishing the intrinsic data table.
Claims (6)
1. A method for spurious-free locking of bias points of an electro-optic conversion module, comprising: the system comprises a light emission driving part, a logic processing part and an electric-optical conversion driving part, wherein the light emission driving part is connected with the light emission part of the electric-optical conversion module, and the electric-optical conversion driving partThe optical transmission driving part comprises a laser driver and a first current detector, the first current detector detects a photo-generated current signal of a backlight detector of the optical transmission part, the logic processing part extracts output optical power of the optical transmission part and the electro-optical conversion part at the same time and performs real-time feedback control, the electro-optical conversion driving part comprises a second current detector, a modulator driver and a jitter generator, and the second current detector detects the output power of the modulator; the method comprises the following steps: initializing self-checking, and carrying out state detection on each part of the electro-optic conversion module; establishing an intrinsic data table, scanning and acquiring the output power P of the modulator under the conditions of starting and loading of a jitter signaloLaser output power PLDA base mode signal Pmod2 order signal PNL2And a bias voltage VBAnd establishing parameters and bias voltage VBThe corresponding intrinsic data table of (1); operating point spurious-free control, using P in the jitter signal off stateo/PLDAnd VBThe intrinsic data table forms feedback control on the electro-optical conversion module; detecting and reconstructing a control state, monitoring whether the control state of the electro-optic conversion module is accurate, and if the control state exceeds a set threshold value, rescanning and establishing an intrinsic data table; the intrinsic data table is established, and the steps are as follows: starting a jitter generator to generate a jitter signal of 1 kHz and adjusting a modulator bias voltage VBAre loaded to the input end of the modulator together; modulator bias voltage sweep, sweeping modulator bias voltage VBFrom a minimum value to a maximum value; collecting current values of a backlight detector of a light emitting part and a detection detector of an electro-optic conversion part; extracting laser output power PLDModulator output power PoA base mode signal Pmod2 order signal PNL2The value of (d); establishing PLD、Po、Pmod、PNL2、Po/PLD、Pmod/PNL2And a bias voltage VBStoring the corresponding intrinsic data table in the data memory; the steps for realizing the spurious-free control of the working point are as follows:the jitter signal is closed, and stray is prevented from being introduced into the signal; setting a bias voltage value corresponding to the orthogonal bias point according to the intrinsic data table, and driving and loading the bias voltage value to the modulator through the modulator; detecting the current value of the backlight detector of the light emitting part and the current value of the detection detector of the electro-optic conversion part to obtain the output power P of the laserLDAnd modulator output power PoFurther, the current state ratio P is obtainedo/PLD(ii) a Obtaining an offset voltage V from the intrinsic data tableb(ii) a Will shift the voltage VbSuperimposed to the bias voltage VBAnd enabling the modulator to work to a quadrature bias point.
2. The method of spurious-free locking of bias points of an electro-optic conversion module of claim 1, wherein: the initialization self-test comprises the following steps: laser current loading in the light emission part, and loading preset driving current on the laser in the light emission part by driving the laser in the light emission driving part to generate an intrinsic light signal of the electro-optic conversion module; detecting the photocurrent of a backlight detector in the light emitting part, and judging whether a laser and the backlight detector in the light emitting part work normally; voltage scanning of a modulator in the electro-optical conversion section, and voltage scanning of a bias voltage of the modulator in the electro-optical conversion section by modulator driving of the electro-optical conversion driving section; and detecting the photocurrent of a detector in the electro-optic conversion part, and judging the working states of a modulator and the detector in the electro-optic conversion part.
3. The method of spurious-free locking of bias points of an electro-optic conversion module of claim 1, wherein: the steps of controlling state detection and reconstruction are as follows: receiving an intrinsic data table trigger signal; starting a dither generator in an electro-optical conversion driving section to generate a dither signal and load the dither signal into a modulator of the electro-optical conversion section; extracting laser output power P of light emitting sectionLDOutput power P of modulator of electro-optic conversion partoA base mode signal Pmod2 order signal PNL2And calculating Po/PLDAnd Pmod/PNL2The value of (d); the obtained Po/PLDAnd Pmod/PNL2Comparing the value of the intrinsic data table with the value of the intrinsic data table, judging whether the value exceeds a set threshold value, if not, reestablishing the intrinsic data table, and carrying out the operating point spurious-free control, and if the value exceeds the threshold value, reestablishing the intrinsic data table.
4. The method of spurious-free locking of bias points of an electro-optic conversion module of claim 1, wherein: the logic processing part comprises a microprocessor and a data memory; the microprocessor performs feedback control on the working states of the light emitting part and the electric-optical conversion part to form a control closed loop; the data memory stores state data of the light emitting part and the electro-optic conversion part.
5. The method of spurious-free locking of bias points of an electro-optic conversion module of claim 1, wherein: the microprocessor adopts a singlechip, an FPGA or a CPLD.
6. The method of spurious-free locking of bias points of an electro-optic conversion module of claim 1, wherein: the laser driving in the light emission driving part adopts a DA circuit or a related analog circuit; a dither generator in an electro-optic conversion driving section is used to generate a weak low frequency dither signal.
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