CN104579458A - Light power compensation method and circuit - Google Patents

Light power compensation method and circuit Download PDF

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Publication number
CN104579458A
CN104579458A CN201410854446.0A CN201410854446A CN104579458A CN 104579458 A CN104579458 A CN 104579458A CN 201410854446 A CN201410854446 A CN 201410854446A CN 104579458 A CN104579458 A CN 104579458A
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current
peak
valley
point
value
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CN201410854446.0A
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Inventor
刘岩海
朱腓利
陈良生
过奕先
李飞鸣
王紫琪
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Shanghai Beiling Co Ltd
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Shanghai Beiling Co Ltd
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Abstract

The invention provides a light power compensation method and a circuit. A peak value and a valley value of an output current of a monitoring photoelectric tube MPD are detected; a drive current (comprising a modulating current and a bias current) of a laser diode (LD) is adjusted according to comparative results between the peak value and the valley value and reference values; the drive current is gradually adjusted to be the same as or close to a reference current; sufficient compensation in temperature characteristics of the slope efficiency of the laser diode (LD) is accordingly carried out; the output light power and the extinction ratio of the laser diode (LD) within the work temperature scope keep stable.

Description

Luminous power compensation method and circuit
Technical field
The present invention relates to a kind of luminous power compensation method and circuit, particularly a kind of luminous power compensation method of applicable high speed optical communication and circuit.
Background technology
The application of optical communication is increasingly extensive, has at a high speed, the considering of low-power consumption and low cost aspect to LDD (laser diode driving) chip.Simultaneously in order to obtain stable optical output power and stable extinction ratio, must compensate the temperature characterisitic of TOSA in the drive circuit of TOSA (utilizing emitted light assembly), making its power output and extinction ratio keep constant.
Summary of the invention
For this reason, the invention provides a kind of luminous power compensation method, comprise: the peak current and the valley point current that detect the monitoring photoelectric tube in utilizing emitted light assembly, described peak current is compared with valley reference current with peak reference electric current respectively with valley point current, wherein, if described peak current is greater than described peak reference electric current, then the modulated current in the drive current of the laser diode be input in described utilizing emitted light assembly is reduced the first variable quantity; If described peak current is less than described peak reference electric current, then described modulated current is increased the second variable quantity; If described valley point current is greater than described valley reference current, then the bias current in described drive current is reduced the 3rd variable quantity; If described valley point current is less than described valley reference current, then described bias current is increased the 4th variable quantity.
Further, according to current temperature value and predetermined parameter list, determine described peak reference electric current and described valley reference current.Described predetermined parameter list comprises the starting point of each section and the slope of the M section line segment for determining described peak reference electric current, and for the starting point of each section of the N section line segment of determining described valley reference current and slope, it obtains according to following method: choose K temperature test point, at each described temperature test point, by adjustment peak reference electric current and valley reference current, the Output optical power of described laser diode and extinction ratio are met the demands, and the peak reference electric current recorded respectively now and valley reference current are the first current value and second current value of this temperature test point, using temperature value as rectangular coordinate system coordinate, another coordinate using current value as this rectangular coordinate system, data fitting is carried out to K described temperature test point and K described first current value, obtains M section line segment, record the starting point of each section and the slope of described M section line segment, using temperature value as rectangular coordinate system coordinate, another coordinate using current value as this rectangular coordinate system, data fitting is carried out to K described temperature test point and K described second current value, obtain N section line segment, record the starting point of each section and the slope of described N section line segment, wherein, the temperature value corresponding to starting point of the line segment that described starting point obtains for described data fitting and current value, described slope is the ratio between the variable quantity of current value in the line segment that obtains of described data fitting and the variable quantity of temperature value.
Present invention also offers a kind of luminous power compensating circuit, comprise: the peak current detector be sequentially connected in series, peak current comparator and adjustable modulation current source, and the valley point current detector be sequentially connected in series, valley point current comparator and adjustable bias current source, described peak current detector and described valley point current detector are all connected to the output of the monitoring photoelectric tube in utilizing emitted light assembly, described adjustable modulation current source and described adjustable bias current source are all connected to the drive end of the laser diode in utilizing emitted light assembly, wherein, described peak current detector and described valley point current detector be the peak current of the output current of described monitoring photoelectric tube that arrives of output detections and valley point current respectively, described peak current compared with peak reference electric current, and is exported the first decision signal by described peak current comparator, and described adjustable modulation current source adjusts its modulated current exported according to described first decision signal, described valley point current compared with valley reference current, and is exported the second decision signal by described valley point current comparator, and described adjustable bias current source adjusts its bias current exported according to described second decision signal.
Further, described adjustable modulation current source is further configured to: when described first decision signal represents that described peak current is greater than described peak reference electric current, then described modulated current is reduced the first variable quantity; When described first decision signal represents that described peak current is less than described peak reference electric current, then described modulated current is increased the second variable quantity; Described adjustable bias current source is further configured to: when described second decision signal represents that described valley point current is greater than described valley reference current, then described bias current is reduced the 3rd variable quantity; When described second decision signal represents that described valley point current is less than described valley reference current, then described bias current is increased the 4th variable quantity.
Further, adjustable peak reference current source and adjustable valley reference current source, export described peak reference electric current and described valley reference current respectively; Temperature sensor, it exports current temperature value; Peakdeviation calculator and valley drift computer, according to described current temperature value and predetermined parameter list, determine described peak reference electric current and described valley reference current respectively.Preferably, described temperature sensor is the temperature sensor of band sluggishness.
Further, between described peak current comparator and described adjustable modulation current source and between described valley point current comparator and described adjustable bias current source, also be connected to the first and second filters, exceed described first and second decision signals of predetermined speed for filtering pace of change.Preferably, described first and second filters are low pass filter.
Luminous power compensation method of the present invention and circuit, power-the current temperature characteristic of LD (laser diode) and the luminous power-output current temperature characterisitic of MPD (monitoring photoelectric tube) in TOSA (utilizing emitted light assembly) can be compensated, keep stable with the power output and extinction ratio that make LD.It can be applicable to high speed data transfer, is suitable for different types of TOSA, can the temperature characterisitic of fine compensation LD and MPD, and is applicable to mainstream CMOS processes manufacture.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram preferred embodiment of luminous power compensating circuit of the present invention;
Fig. 2 is the schematic diagram of the predetermined parameter list of luminous power compensation method of the present invention and circuit.
Embodiment
Below in conjunction with the drawings and specific embodiments, luminous power compensation method of the present invention and circuit are described in further detail, but not as a limitation of the invention.
With reference to Fig. 1, it is the electrical block diagram preferred embodiment of luminous power compensating circuit of the present invention.In the encapsulation of utilizing emitted light assembly TOSA, an Output optical power part for laser diode LD is coupled to monitoring photoelectric tube MPD, and monitoring photoelectric tube MPD exports real-time monitoring current.Luminous power-drive current the curve of laser diode LD has strong non-linear, the electric current-luminous power curve of monitoring photoelectric tube MPD also not definite value.In operating temperature range, typical slope efficiency and tracking error have the change close to 3dB.The present invention is intended to the temperature characterisitic compensating laser diode LD and monitoring photoelectric tube MPD, makes the Output optical power of operating temperature range inner laser diode LD and extinction ratio keep stable.
Luminous power compensating circuit of the present invention comprises, the peak current detector 110 be sequentially connected in series, peak current comparator 210 and adjustable modulation current source 310, and the valley point current detector 120 be sequentially connected in series, valley point current comparator 220 and adjustable bias current source 320.
Peak current detector 110 and valley point current detector 120 are all connected to the output of the monitoring photoelectric tube MPD in utilizing emitted light assembly TOSA, and adjustable modulation current source 310 and adjustable bias current source 320 are all connected to the drive end of the laser diode LD in utilizing emitted light assembly TOSA.
The output current being input as monitoring photoelectric tube MPD of peak current detector 110, i.e. high speed current signal, exports the peak current I1 of the output current of the monitoring photoelectric tube MPD for detecting, i.e. low speed current signal.Peak current I1 compared with peak reference electric current I ref1, and is exported the first decision signal Ic1 by peak current comparator 210.Adjustable modulation current source 310 adjusts its modulated current Im exported according to the first decision signal Ic1: when the first decision signal Ic1 represents that peak current I1 is greater than peak reference electric current I ref1, modulated current Im is reduced the first variation delta 1; When the first decision signal Ic1 represents that peak current I1 is less than peak reference electric current I ref1, then modulated current Im is increased the second variation delta 2.
Correspondingly, the output current being input as monitoring photoelectric tube MPD of valley point current detector 120, i.e. high speed current signal, exports the valley point current I2 of the output current of the monitoring photoelectric tube MPD for detecting, i.e. low speed current signal.Valley point current I2 compared with valley reference current Iref2, and is exported the second decision signal Ic2 by valley point current comparator 220.Adjustable bias current source 320 adjusts its bias current Ib exported according to the second decision signal Ic2: when the second decision signal Ic2 represents that valley point current I2 is greater than valley reference current Iref2, then bias current Ib is reduced the 3rd variation delta 3; When the second decision signal Ic2 represents that valley point current I2 is less than valley reference current Iref2, then bias current Ib is increased the 4th variation delta 4.
Because the output of peak value and valley point current detector 110,120 is low speed current signal, therefore, peak value and valley point current comparator 210,220 all can be designed to low speed current comparator, to reduce power consumption.
Wherein, first, second, third, fourth variation delta 1-4 can be arranged as required, such as, can all be set to minimum unit of adjustment.Because variations in temperature most in application scenarios all can be thought slowly, therefore, in digitized circuit, the amplitude that each modulated current Im and bias current Ib adjusts can be set to the 1LSB of electric current code, i.e. the minimum adjusting range of electric current code.
Thus, luminous power compensating circuit of the present invention, achieve corresponding luminous power compensation method, namely by detecting peak value and the valley of the output current of monitoring photoelectric tube MPD, and according to the comparative result of this peak value and valley and reference value, the drive current (comprising modulated current and bias current) of laser diode LD is adjusted, progressively adjust to identical with reference current or close, thus fully compensate the temperature characterisitic of the slope efficiency of laser diode LD, make the Output optical power of the laser diode LD in operating temperature range and extinction ratio keep stable.
Further, the temperature characterisitic of the tracking error of monitoring photoelectric tube MPD also needs to compensate, and this compensation can by chip clocked flip.For this reason, continue with reference to Fig. 1, luminous power compensating circuit of the present invention also comprises: adjustable peak reference current source 410, adjustable valley reference current source 420, temperature sensor 500, peakdeviation calculator 610 and valley drift computer 620.
Wherein, temperature sensor 500 exports current temperature value to peakdeviation calculator 610 and valley drift computer 620.Peakdeviation calculator 610 and valley drift computer 620, according to current temperature value and predetermined parameter list, determine peak reference electric current I ref1 and valley reference current Iref2 respectively.Adjustable peak reference current source 410 and adjustable valley reference current source 420, the value of the peak reference electric current I ref1 determined according to peakdeviation calculator 610 and valley drift computer 620 and valley reference current Iref2, correspondingly exports peak reference electric current I ref1 and valley reference current Iref2 respectively.
Wherein, peak value and valley drift computer 610,620 can be used for determining the actual value of reference current, also can be used for determining the difference between the reference current that reference current under Current Temperatures and current reference current source export, the difference etc. between reference current under Current Temperatures and the starting point of reference current initial value or the range of linearity, Current Temperatures place can also be determined, i.e. deviant, thus adjustable peak and valley reference current source 410,420 are adjusted according to the value of this deviant to the reference current exported.
With reference to Fig. 2, it is the expression of the pictorialization of predetermined parameter list.Because the change of peak value and valley reference current presents approximate piece wire characteristic in whole temperature range, therefore, peak value and valley reference current can be carried out sectional linear fitting relative to the change of temperature, to obtain predetermined parameter list.
So, predetermined parameter list is by the M section line segment P1_K1 for determining peak reference electric current I ref1, P1_K2, the starting point of each section of P1_K3 (comprises the temperature T1 of starting point, the value of the peak reference electric current of T2 and correspondence thereof) and slope (i.e. the variable quantity of peak reference electric current and the ratio of the variable quantity of corresponding temperature), and for determining the N section line segment P0_K1 of valley reference current Iref2, P0_K2, the starting point of each section of P0_K3 (comprises the temperature T1 of starting point, the value of the valley reference current of T2 and correspondence thereof) and slope (i.e. the variable quantity of valley reference current and the ratio of the variable quantity of corresponding temperature) form.Give the linear approximation of 3 sections in Fig. 2, but be understandable that, actual use in can according to concrete application needs, be designed to the linear approximation of less or more section.
This predetermined parameter list can obtain in the calibration process of machine system, namely after the model and peripheral cell of selected utilizing emitted light assembly TOSA, only need calibration machine system carried out within the scope of a total temperature, starting point and the slope of each section of M and N section line segment can be obtained, the parameter list namely preset.
Concrete grammar is: in the temperature range needing calibration, choose K temperature test point.This temperature range can be total temperature scope, also can be the typical temperature scope of chip operation environment.For most utilizing emitted light assembly TOSA, choose a temperature test point and just can provide enough measuring accuracies for every 10 DEG C.
Each temperature test point in K temperature test point, by adjustment peak reference electric current and valley reference current, the Output optical power of laser diode LD and extinction ratio are met design requirement, and the peak reference electric current recorded respectively now and valley reference current are the first current value and second current value of this temperature test point.
Choose suitable linear fit algorithm, data fitting is carried out to K temperature test point and K the first current value, obtains M section line segment, the starting point (temperature value that namely starting point of line segment is corresponding) of each section of record M section line segment and slope.Similarly, data fitting is carried out to K temperature test point and K the second current value, obtains N section line segment, the starting point of each section of record N section line segment and slope.
In order to simplify in reality, to the piece wire approximation of peak reference value and valley reference value, identical starting point and slope can be used.
Meanwhile, can also arrange initial value to peak value and valley reference current, the reference current value of near room temperature in predetermined parameter list chosen by this initial value usually.
Correspondingly, temperature sensor 500 can be configured to export relative temperature value, namely the temperature offset amount of Current Temperatures relative to the starting point of place line segment is exported, simultaneously, peak value and valley drift computer 610,620 are according to this temperature offset amount, and the starting point of place line segment and slope, peak value or the valley reference current side-play amount relative to the starting point of place line segment can be calculated.
Especially, in digitized circuit, the current temperature value that temperature sensor 500 exports is thermometer code, and the current offset amount that peak value and valley drift computer 610,620 export is electric current code.Consider and be easy to realize with cmos circuit, when determining the slope of every section of line segment of predetermined parameter list, in the scope that error allows, slope is set to 2^N, and wherein N is integer (can think positive integer, also can be negative integer).Such as, when matching section line segment, in the temperature range of this line segment, thermometer code co-variation 400LSB, electric current code co-variation 10LSB, then thermometer code change 32LSB when the slope of this section of line segment can be chosen for electric current code change 1LSB.
In order to avoid when temperature is near the starting point of certain section of line segment, reference current carries out unnecessary frequent adjustment, and preferably, temperature sensor 500 is the temperature sensor of band sluggishness.That is, if in certain interval (sluggish scope) of the vicinity of temperature online section starting point, then do not carry out the adjustment of reference current.
In order to get rid of the adverse effect of unnecessary fast-changing first and second decision signal Ic1, Ic2, between peak current comparator 210 and adjustable modulation current source 310 and between valley point current comparator 220 and adjustable bias current source 320, also be connected to the first and second filters 710,720, exceed first and second decision signal Ic1, Ic2 of predetermined speed for filtering pace of change.Preferably, the first and second filters 710,720 are low pass filter, and its bandwidth parameter can adjust according to application needs, to keep the stable of whole loop.
Luminous power compensation method of the present invention and circuit application are in the driving chip of laser diode LD, be suitable for sub-micron or deep sub-micron semiconductor technique, the design and manufaction of (>2.5GBps) optical communication chip at a high speed can be widely used in, and it is applicable to different types of utilizing emitted light assembly TOSA, can accurately compensates laser diode LD simultaneously and detect the temperature characterisitic of photoelectric tube MPD.
Above embodiment is only illustrative embodiments of the present invention, can not be used for limiting the present invention, and protection scope of the present invention is defined by the claims.Those skilled in the art can in essence of the present invention and protection range, and make various amendment or equivalent replacement to the present invention, these are revised or be equal to replacement and also should be considered as dropping in protection scope of the present invention.

Claims (9)

1. a luminous power compensation method, comprising: the peak current and the valley point current that detect the monitoring photoelectric tube in utilizing emitted light assembly, is compared respectively by described peak current with valley point current with peak reference electric current with valley reference current,
If described peak current is greater than described peak reference electric current, then the modulated current in the drive current of the laser diode be input in described utilizing emitted light assembly is reduced the first variable quantity;
If described peak current is less than described peak reference electric current, then described modulated current is increased the second variable quantity;
If described valley point current is greater than described valley reference current, then the bias current in described drive current is reduced the 3rd variable quantity;
If described valley point current is less than described valley reference current, then described bias current is increased the 4th variable quantity.
2. luminous power compensation method according to claim 1, is characterized in that, according to current temperature value and predetermined parameter list, determines described peak reference electric current and described valley reference current.
3. luminous power compensation method according to claim 2, it is characterized in that, described predetermined parameter list comprises the starting point of each section of the M section line segment for determining described peak reference electric current and slope and for the starting point of each section of the N section line segment of determining described valley reference current and slope, it obtains according to following method:
Choose K temperature test point, at each described temperature test point, by adjustment peak reference electric current and valley reference current, the Output optical power of described laser diode and extinction ratio are met the demands, and the peak reference electric current recorded respectively now and valley reference current are the first current value and second current value of this temperature test point;
Using temperature value as rectangular coordinate system coordinate, another coordinate using current value as this rectangular coordinate system, data fitting is carried out to K described temperature test point and K described first current value, obtains M section line segment, record the starting point of each section and the slope of described M section line segment;
Using temperature value as rectangular coordinate system coordinate, another coordinate using current value as this rectangular coordinate system, carries out data fitting to K described temperature test point and K described second current value, obtain N section line segment, record the starting point of each section and the slope of described N section line segment, wherein
The temperature value corresponding to starting point of the line segment that described starting point obtains for described data fitting and current value, described slope is the ratio between the variable quantity of current value in the line segment that obtains of described data fitting and the variable quantity of temperature value.
4. a luminous power compensating circuit, comprise: the peak current detector be sequentially connected in series, peak current comparator and adjustable modulation current source, and the valley point current detector be sequentially connected in series, valley point current comparator and adjustable bias current source, described peak current detector and described valley point current detector are all connected to the output of the monitoring photoelectric tube in utilizing emitted light assembly, described adjustable modulation current source and described adjustable bias current source are all connected to the drive end of the laser diode in utilizing emitted light assembly, wherein
Described peak current detector and described valley point current detector be the peak current of the output current of described monitoring photoelectric tube that arrives of output detections and valley point current respectively;
Described peak current compared with peak reference electric current, and is exported the first decision signal by described peak current comparator, and described adjustable modulation current source adjusts its modulated current exported according to described first decision signal;
Described valley point current compared with valley reference current, and is exported the second decision signal by described valley point current comparator, and described adjustable bias current source adjusts its bias current exported according to described second decision signal.
5. luminous power compensating circuit according to claim 4, is characterized in that,
Described adjustable modulation current source is further configured to: when described first decision signal represents that described peak current is greater than described peak reference electric current, then described modulated current is reduced the first variable quantity; When described first decision signal represents that described peak current is less than described peak reference electric current, then described modulated current is increased the second variable quantity;
Described adjustable bias current source is further configured to: when described second decision signal represents that described valley point current is greater than described valley reference current, then described bias current is reduced the 3rd variable quantity; When described second decision signal represents that described valley point current is less than described valley reference current, then described bias current is increased the 4th variable quantity.
6. luminous power compensating circuit according to claim 4, is characterized in that, also comprise:
Adjustable peak reference current source and adjustable valley reference current source, export described peak reference electric current and described valley reference current respectively;
Temperature sensor, it exports current temperature value;
Peakdeviation calculator and valley drift computer, according to described current temperature value and predetermined parameter list, determine described peak reference electric current and described valley reference current respectively.
7. luminous power compensating circuit according to claim 6, is characterized in that, described temperature sensor is the temperature sensor of band sluggishness.
8. luminous power compensating circuit according to claim 4, it is characterized in that, between described peak current comparator and described adjustable modulation current source and between described valley point current comparator and described adjustable bias current source, also be connected to the first and second filters, exceed described first and second decision signals of predetermined speed for filtering pace of change.
9. luminous power compensating circuit according to claim 8, is characterized in that, described first and second filters are low pass filter.
CN201410854446.0A 2014-12-30 2014-12-30 Light power compensation method and circuit Pending CN104579458A (en)

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CN107543537A (en) * 2017-07-10 2018-01-05 北京控制工程研究所 A kind of method for improving optic fiber gyroscope graduation factor stability
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CN109687904A (en) * 2019-01-14 2019-04-26 广州致远电子有限公司 A kind of short distance laser communication transmitting optical power calibration device and calibration method
CN112104424A (en) * 2020-09-03 2020-12-18 南京捷澳德信息科技有限公司 High-temperature extinction ratio optimization method for 5G forward-transmission industrial-grade optical module

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Application publication date: 20150429