CN100344083C - Control method and control circuit of output light power and extinction ratio of light transmitter - Google Patents

Control method and control circuit of output light power and extinction ratio of light transmitter Download PDF

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Publication number
CN100344083C
CN100344083C CNB2003101145226A CN200310114522A CN100344083C CN 100344083 C CN100344083 C CN 100344083C CN B2003101145226 A CNB2003101145226 A CN B2003101145226A CN 200310114522 A CN200310114522 A CN 200310114522A CN 100344083 C CN100344083 C CN 100344083C
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pav
ibias
imod
control
power
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CN1555139A (en
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姜瑜斐
赵世昌
赵其圣
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Hisense & Jonhon Optical Electrical Technologies Co ltd
Hisense Broadband Multimedia Technology Co Ltd
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HAISENSE PHOTOELECTRIC SCIENCE AND TECHNOLOGY Co Ltd QINGDAO
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Abstract

The present invention relates to a control method and a control circuit for the output light power and the extinction ratio of a light transmitter, which belongs to the field of light communication and control. The control method adopts an APC circuit and backlight photoelectric tube monitor to change Ibias and regulate Pav. The control method comprises the steps that an initial operation point of a light source is arranged under normal temperature, the allowed variation range of the Pav, the Ibias, Ith, OMA, ER and Imod are set, the APC is used for controlling the Pav to be unchanged and monitoring other variables; when the variables, such as temperature, time, etc. exceed the variation range, the other variables are regulated to make a controlled variable restore to the original range; the Pav, the Ibias, the Ith and the SE in temperature T at t time are calculated; the SE and a normal temperature setting value are compared, the Imod is regulated, and the OMA and the ER maintain the initial setting value. The control circuit comprises a driver, a digital potentiometer, a microprocessor, a laser, etc., and can automatically control the average optical output power and the extinction ratio of the light transmitter in a real-time mode. The performance of the light transmitter is ensured not to be influenced by temperature, light sources and aging. The control method and the control circuit can be widely used for the parametric control of the light transmitter.

Description

The control method of optical sender Output optical power and extinction ratio and control circuit thereof
Technical field
The invention belongs to optical communication control technology field, more particularly relate to the control method of optical communication transmitter Output optical power and extinction ratio and the improvement of automatic control circuit thereof.
Background technology
Light sources such as present various laser and light-emitting diode, its luminous efficiency all constantly change with the aging of working temperature and light source, and this will have a strong impact on indexs such as the reliability of the job stability of optical sender and communication and the communication error rate.Can adopt the APC circuit to control automatically to average optical output power at present.APC utilizes the photoelectric tube backlight that is packaged together with light source to survey the size of Output optical power, then by the driving bias current of feedback circuit control light source, makes Output optical power keep constant.Because the frequency response of photoelectric tube backlight is very low, can not the real-time response Output optical power with the situation of change of signal of communication, can only reflect its mean value, thereby can't be used to control transmitter the modulation amplitude of light source, also just can't carry out the automatic control of modulation signal, can only rule of thumb compensate, and this compensation is to solve the individual difference problem of laser performance.In addition, owing to be to adopt the hardware feedback control circuit, do not have intelligently, when unusual or fault take place for light source or interlock circuit, can't make light source such as laser enter safe and effective protected mode, occur accident easily even injure the user.
Purpose of the present invention, just be to overcome above-mentioned shortcoming and defect, provide a kind of and can be simultaneously parameters such as the average optical output power of optical sender and extinction ratio be carried out in real time control automatically, guarantee that transmitter performance is not subjected to the influence of factors such as temperature, light source ages, and the working point of light source such as monitoring laser in real time, guarantee the method and the circuit of the operating state that it is in safety and stability all the time.The communication speed of optical sender, communication distance, communication wavelength, coding form or modulation signal form, communications protocol etc. are unrestricted.
Summary of the invention
In order to achieve the above object, the present invention adopts automated power control APC (Auto powercontral) circuit to control automatically, monitor the variation of average luminescence power by photoelectric tube backlight, adjust average optical output power Pav by changing the Ibias bias current.It also comprises the steps:
1. set the average optical output power Pav of the initialization point of light source at normal temperatures 0, bias current Ibias 0, drive current threshold value Ith 0, optical modulation amplitude OMA 0, extinction ratio ER 0With modulated current Imod 0, calculate luminosity curve slope S E under the normal temperature 0=OMA 0/ Imod 0
2. the excursion of setting average optical output power Pav, bias current Ibias that optical sender allows, drive current threshold value Ith, optical modulation amplitude OMA, extinction ratio ER, modulated current Imod variable is respectively Pav ± Δ 1, Ibias ± Δ 2, Ith ± Δ 3, OMA ± Δ 4, ER ± Δ 5, Imod ± Δ 6, Δ in the above-mentioned formula 1, Δ 2, Δ 3, Δ 4, Δ 5, Δ 6The maximum that is respectively Pav, Ibias, Ith, OMA, ER and Imod allows changing value;
3. utilize the control of automated power control APC circuit and keep Pav constant, and monitoring Ibias=Ibias (T, t), (T is that temperature, t are the time to Imod=Imod in the formula for T, the variation of other variable t) and in the above-mentioned 2. step;
4. work as temperature and change to T2 and variation from T1 | T2-T1| 〉=Δ 7, the time changes to t2 and t2 〉=t1+ Δ from t1 8Or the above-mentioned 2. variation of other variable described in the step exceeds above-mentioned set excursion, then adjusts described other variable and keeps the APC operate as normal, and the Be Controlled variable is returned within the set scope; As recovering normal condition, then send alarm signal; Δ in the formula 7Maximum permission changing value, Δ for temperature 8Maximum permission changing value for the time;
5. utilize above-mentioned 4. step gained data, calculate t constantly, Pav=Pav when temperature is T (T, t), Ibias=Ibias (T, t), Ith=Ith (T, t), again by numerical computations, can get SE (T, t)=Pav (T, t)/(Ibias (T, t)-Ith (T, t));
6. compare the difference of set point under SE and the normal temperature, adjust Imod, make OMA and ER keep identical with initial set value.
The present invention proposes a kind of control method, according to this method, need not transmitter light source, photoelectric tube backlight and corresponding communication control circuit are carried out any modification, can finish the control in real time fully automatically of optical sender average optical output power and optical modulation amplitude, and the working point of light source such as monitoring laser in real time, guarantee that it is in the operating state of safety and stability, where necessary timely outputting alarm signal.In addition, this patent adopts microprocessor and other application-specific integrated circuit (ASIC) to design the control system of implementing this method, has finished the Based Intelligent Control to light source.
Ideally, the luminous power P of semiconductor laser (or luminous tube) and the relation of drive current I are: after drive current surpassed drive current threshold value Ith, the basic and drive current of luminous power was linear change.But actual conditions more complicated, drive current is only in certain zone, the P-I curve just can be approximately straight line, and crucial be slope of curve SE (slopeefficiency), that is light source light-emitting efficiency will change with the influence of the factors such as individual difference of aging, the various lasers of working temperature, laser.
The purpose of this control method is will be by the mode of computer software combination of hardware, in existing Laser Drive mode, do not increase any special hardware resource, for concrete laser, under arbitrary temp, under degree of aging arbitrarily, finish the control in real time automatically of its average optical output power Pav, optical modulation amplitude and extinction ratio ER (ratio of level"1" Output optical power and level "0" Output optical power, i.e. P1/P0).
Under existing Laser Drive mode, monitor the variation of average luminescence power and adjust Pav by photoelectric tube backlight by changing the Ibias bias current, but photoelectric tube backlight can only detect average light power because frequency response is low, can't detect optical modulation amplitude OMA.
Therefore, this controlling party ratio juris is as follows:
1. step is used for the initialization point Pav of setting laser device at normal temperatures 0, Ibias 0, Ith 0, OMA 0, ER 0And Imod 0And calculate luminosity curve slope S E under the normal temperature 0=OMA 0/ Imod 0
2. step is used to set the excursion Pav ± Δ of the above-mentioned variable that optical sender allows 1, Ibias ± Δ 2, Ith ± Δ 3, OMA ± Δ 4, ER ± Δ 5And Imod ± Δ 6, Δ in the formula 1, Δ 2, Δ 3, Δ 4, Δ 5, Δ 6The maximum that is respectively Pav, Ibias, Ith, OMA, ER, Imod allows changing value.
3. step is utilized hardware automatic power control circuitry APC control and is kept Pav constant, and monitoring Ibias=Ibias (T, t), Imod=Imod (T, t) and the variation of other variable.T is that temperature, t are the time in the formula.
Step 4. be temperature from T1 change to T2 and | T2-T1| 〉=Δ 7, the time changes to t2 and t2 〉=t1+ Δ from t1 8Or the variable quantity of other variable adjusts other variable and keeps the APC operate as normal when exceeding set excursion, and the Be Controlled variable is returned within the set scope.As recovering normal condition, then send alarm signal.Δ in the formula 7Maximum permission changing value, Δ for temperature 8Maximum permission changing value for the time.
5. step is to utilize 4. gained data of step, calculate t constantly, Pav, Ibias and Ith when temperature is T, again by numerical computations get SE (T, t)=Pav (T, t)/(Ibias (and T, t)-Ith (T, t)).
6. step is because of ER=P1/P0, Pav=(P1+P0)/2, and ER and Pav are constant as if keeping, and then P1, P0 must remain unchanged, and OMA=P1-P0 also remains unchanged.And Imod (T, t)=(T t), therefore compares the difference of set point under SE and the normal temperature to OMA/SE, adjusts Imod, just can make OMA and ER keep identical with initial set value.
Light source can be a kind of in VCSEL laser, FP laser, Distributed Feedback Laser or the light-emitting diode.
The control circuit of optical sender Output optical power and extinction ratio comprises driver, digital regulation resistance, microprocessor, laser, photoelectric tube backlight.The back-modulation electric current output pin of driver is connected with the negative pole anodal and photoelectric tube backlight of power supply and laser by resistance, the laser bias current output pin of driver is connected with the negative pole of laser by inductance coil, the detection diode input pin of driver is connected with the positive pole of photoelectric tube backlight, and driver, digital regulation resistance and microprocessor interconnect each other.
The model of driver is MAX3735, and the model of digital regulation resistance is AD5243, and the model of microprocessor is F330.
The MAX3735 drive laser, the variation of the interlock circuit parameter of software instruction by MCU F330 and multi-channel A transducer monitoring MAX3735, comprise photoelectric tube electric current backlight, laser bias current, operating voltage, working temperature, optical receiver luminous power etc., and, reach the full-automatic control in real time of average light power and extinction ratio by control and adjustment that AD5243 averages luminous power Pav and modulation current amplitude Imod.
Advantage of the present invention and good effect are:
Adopt this method can be simultaneously parameters such as the average optical output power of optical sender and extinction ratio to be carried out in real time control automatically, guarantee that transmitter performance is not subjected to the influence of factors such as temperature, light source ages.
In the optical sender course of work, the situation that can change with temperature, aging etc. according to light source light-emitting efficiency and linear work district etc., the automatically online best operating point that obtains comprises transmitter quiescent point and modulation amplitude etc., have intelligently, can prolong life-span of transmitter.
Communication system can obtain the operating state of transmitter light source in real time and whether break down, whether to the life-span.
On production line, can utilize computer to read the relevant data of microprocessor in the optical sender, and show the operating state of light sources such as laser, comprise threshold current, light source light-emitting efficiency, transmitter quiescent point and modulation amplitude etc.Be convenient to obtain on the production line optimized parameter, effectively choose best operating point.
When controlling average optical output power and extinction ratio automatically in real time, do not propagate any additional signal to communication system, can not bring any interference to communication system.
Invention still adopts the photoelectric tube backlight of common low frequency response to carry out detection backlight.
Transmitter and control system parameter need not manual calibration, are obtained automatically by microprocessor.
The present invention is to the communications protocol of communication system, coding form, and communication speed, communication wavelength, communication distance is without any dependence.
Systemic-function satisfies whole requirements of SFF-8472MSA multi-source agreement, can monitor the emission luminous power, bias current, received optical power, operating ambient temperature, operating voltage is controlled in indexs such as emission luminous power, extinction ratio and comprises IEEE802.3Z, FC-PI-2, ITU-TG..957, G.958 wait the requirement of standard, be used to comprise SDH/SONET, PIBRECHANNEL is in the communication systems such as ETHERNET.And have various alarm and protection functions and an I 2The C communication function.
Description of drawings
Fig. 1 shows the relation of the luminous power P and the drive current I of semiconductor laser (or luminous tube).
Fig. 2 is the control circuit schematic diagram of optical sender Output optical power of the present invention and extinction ratio.
Embodiment
Embodiment 1.The control method of a kind of optical sender Output optical power and extinction ratio.Its adopts APC circuit to control automatically, by photoelectric tube backlight monitor average luminescence power variation, adjust average optical output power Pav by changing the Ibias bias current.It comprises the steps:
1. set the average optical output power Pav of the initialization point of light source at normal temperatures 0, bias current Ibias 0, drive current threshold value Ith 0, optical modulation amplitude OMA 0, extinction ratio ER 0With modulated current Imod 0, calculate luminosity curve slope S E under the normal temperature 0=OMA 0/ Imod 0
2. the excursion of setting Pav, Ibias that optical sender allows, Ith, OMA, ER, Imod variable is respectively Pav ± Δ 1, Ibias ± Δ 2, Ith ± Δ 3, OMA ± Δ 4, ER ± Δ 5, Imod ± Δ 6, Δ in the above-mentioned formula 1, Δ 2, Δ 3, Δ 4, Δ 5, Δ 6The maximum that is respectively Pav, Ibias, Ith, OMA, ER, Imod allows changing value;
3. utilize automatic power control circuitry APC control and keep Pav constant, and monitoring Ibias=Ibias (T, t), (T is that temperature, t are the time to Imod=Imod in the formula for T, the variation of other variable t) and in the above-mentioned 2. step;
4. when temperature from T1 change to T2 and | T2-T1| 〉=Δ 7, the time changes to t2 and t2 〉=t1+ Δ from t1 8Or the above-mentioned 2. variable quantity of other variable described in the step exceeds above-mentioned set excursion, then adjusts described other variable and keeps the APC operate as normal, and the Be Controlled variable is returned within the set scope; As recovering normal condition, then send alarm signal; Δ in the formula 7Maximum permission changing value, Δ for temperature 8Maximum permission changing value for the time;
5. utilize above-mentioned 4. step gained data, calculate t constantly, Pav=Pav when temperature is T (T, t), Ibias=Ibias (T, t), Ith=Ith (T, t), again by numerical computations, can get SE (T, t)=Pav (T, t)/(Ibias (T, t)-Ith (T, t));
6. compare the difference of set point under SE and the normal temperature, adjust Imod, make OMA and ER keep identical with initial set value.
Embodiment 2.The control circuit of the control method of a kind of optical sender Output optical power and extinction ratio, as shown in Figure 2.It comprises driver (1), digital regulation resistance (2), microprocessor (3), laser (4), photoelectric tube backlight (5).The back-modulation electric current output pin of driver (1) is connected with the negative pole anodal and photoelectric tube backlight of power supply and laser (4) by resistance, its laser bias current output pin is connected by the negative pole of inductance coil with laser (4), and its monitor diode input pin is connected with the positive pole of photoelectric tube backlight (5).Driver (1), digital regulation resistance (2) and microprocessor (3) interconnect each other.
The model of driver (1) is MAX3735, and the model of digital regulation resistance (2) is AD5243, and the model of microprocessor (3) is F330.
Embodiment 1 and embodiment 2 can guarantee that its performance is not subjected to the influence of factors such as temperature, light source ages to the average optical output power and the extinction ratio control automatically in real time of optical sender, guarantee that it is in the operating state of safety and stability, prolong its useful life.It can be widely used in the automatic control of optical sender running parameter.

Claims (4)

1. the control method of optical sender Output optical power and extinction ratio, it adopts automated power control APC circuit to control automatically, by photoelectric tube backlight monitor average luminescence power variation, adjust average optical output power Pav by changing the Ibias bias current, it is characterized in that it comprises the steps:
1. set the average optical output power Pav of the initialization point of light source at normal temperatures 0, bias current Ibias 0, drive current threshold value Ith 0, optical modulation amplitude OMA 0, extinction ratio ER 0With modulated current Imod 0, calculate luminosity curve slope S E under the normal temperature 0=OMA 0/ Imod 0
2. the excursion of setting average optical output power Pav, bias current Ibias that optical sender allows, drive current threshold value Ith, optical modulation amplitude OMA, extinction ratio ER, modulated current Imod variable is respectively Pav ± Δ 1, Ibias ± Δ 2, Ith ± Δ 3, OMA ± Δ 4, ER ± Δ 5, Imod ± Δ 6, Δ in the above-mentioned formula 1, Δ 2, Δ 3, Δ 4, Δ 5, Δ 6The maximum that is respectively Pav, Ibias, Ith, OMA, ER and Imod allows changing value;
3. utilize automatic power control circuitry APC control and keep Pav constant, and monitoring Ibias=Ibias (T, t), (T is that temperature, t are the time to Imod=Imod in the formula for T, the variation of other variable t) and in the above-mentioned 2. step;
4. work as temperature and change to T2 and variation from T1 | T2-T1| 〉=Δ 7, the time changes to t2 and changes t2 〉=t1+ Δ from t1 8Or the above-mentioned 2. variable quantity of other variable described in the step exceeds above-mentioned set excursion, then adjusts described other variable and keeps the APC operate as normal, and the Be Controlled variable is returned within the set scope; As recovering normal condition, then send alarm signal; Δ in the formula 7Maximum permission changing value, Δ for temperature 8Maximum permission changing value for the time;
5. utilize above-mentioned 4. step gained data, calculate t constantly, Pav=Pav when temperature is T (T, t), Ibias=Ibias (T, t), Ith=Ith (T, t), again by numerical computations, can get SE (T, t)=Pav (T, t)/(Ibias (T, t)-Ith (T, t));
6. compare the difference of set point under SE and the normal temperature, adjust Imod, make OMA and ER keep identical with initial set value.
2. according to the control method of described optical sender Output optical power of claim 1 and extinction ratio, it is characterized in that said light source is a kind of in VCSEL laser, FP laser, Distributed Feedback Laser or the light-emitting diode.
3. according to the control circuit of the control method of described optical sender Output optical power of claim 1 and extinction ratio, it is characterized in that it comprises driver, digital regulation resistance, microprocessor, laser, photoelectric tube backlight, the back-modulation electric current output pin of driver is connected with the negative pole anodal and photoelectric tube backlight of power supply and laser by resistance, the laser bias current output pin of driver is connected with the negative pole of laser by inductance coil, the monitor diode input pin of driver is connected driver with the positive pole of photoelectric tube backlight, digital regulation resistance and microprocessor interconnect each other.
4. according to the control circuit of the control method of described optical sender Output optical power of claim 3 and extinction ratio, the model that it is characterized in that said driver is MAX3735, and the model of digital regulation resistance is AD5243, and the model of microprocessor is F330.
CNB2003101145226A 2003-12-19 2003-12-19 Control method and control circuit of output light power and extinction ratio of light transmitter Expired - Fee Related CN100344083C (en)

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US20070116076A1 (en) * 2005-11-21 2007-05-24 Frank Wang Controlling optical power and extincation ratio of a semiconductor laser
CN1863014B (en) * 2006-04-13 2010-12-01 中兴通讯股份有限公司 Temperture compensating method and apparatus for extinction ratio parameter without cooling laser
CN101296034B (en) 2007-04-26 2012-07-11 华为技术有限公司 Method and apparatus for transmission of monitoring information, passive optical network system
CN101494504B (en) * 2008-12-16 2012-11-21 武汉电信器件有限公司 Automatic control optical module with constant average light power and extinction ratio based on singlechip
CN101483481B (en) * 2009-02-05 2011-08-24 成都优博创技术有限公司 Debugging method for average light power and extinction ratio parameter of light transmitter
EP2713528A4 (en) * 2011-06-16 2014-11-05 Huawei Tech Co Ltd Method and device for optical power control
TW201338320A (en) * 2012-03-05 2013-09-16 Alpha Networks Inc Method of controlling optical power and extinction ratio over full temperature range
CN103401138B (en) * 2013-07-26 2015-07-29 烽火通信科技股份有限公司 The system and method for automatic configuration extinction ratio of laser driver
CN105007123B (en) * 2015-08-12 2017-06-20 索尔思光电（成都）有限公司 A kind of optical module light eye pattern ER controls to adjust method and system
CN106301591B (en) * 2016-08-31 2019-08-23 广东海信宽带科技有限公司 The method and device for maintaining extinction ratio stable

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