CN101859156B - Bias voltage control device of electrooptic modulator and control method thereof - Google Patents
Bias voltage control device of electrooptic modulator and control method thereof Download PDFInfo
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- CN101859156B CN101859156B CN2010101735948A CN201010173594A CN101859156B CN 101859156 B CN101859156 B CN 101859156B CN 2010101735948 A CN2010101735948 A CN 2010101735948A CN 201010173594 A CN201010173594 A CN 201010173594A CN 101859156 B CN101859156 B CN 101859156B
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Abstract
The invention discloses a bias voltage control device of an electrooptic modulator and a control method thereof. The bias voltage control device is a bias voltage drive developed aiming at the electrooptic modulator. By controlling bias voltage of the electrooptic modulator, the aim of ensuring that the electrooptic modulator stably works at a proper work place can be achieved. A photoelectric detector (1), a transimpedance amplifying circuit (2), an analogue-digital converting circuit (3), a controller (4) and an output drive circuit (5) of the bias voltage control device are connected in sequence; pulse light modulated by the electrooptic modulator splits out a part of light signals through an optical coupler to be connected with the input end of the photoelectric detector (1); and the output end of the output drive circuit (5) is connected with a bias voltage input port of the electrooptic modulator for controlling the bias voltage of the electrooptic modulator. The device realizes the automatic control of the bias voltage of the electrooptic modulator, so that the electrooptic modulator continuously works at stable extinction ratio and the work stability of the electrooptic modulator can be improved.
Description
Technical field
The present invention is a kind of bias voltage driver of electrooptic modulator, is used to supply with the suitable bias voltage of electrooptic modulator, makes electrooptic modulator be operated in the proper operation point.Belong to automation field.
Background technology
Electrooptic modulator is a kind of optical device very widely of using in fields such as high speed optical communication, Fibre Optical Sensors.Yet; Electrooptic modulator is because himself structural reason; Environment temperature, mechanical distortion, mechanical vibration and input polarization state of light change all can cause the slow drift (Fig. 2 is seen in signal) of electrooptic modulator working point; Thereby the extinction ratio that causes electrooptic modulator descends, performance depreciation, has brought trouble for the application of electrooptic modulator.Therefore, be very necessary what electrooptic modulator is carried out the working point from motion tracking and control.
The working point of electrooptic modulator receives the influence of bias voltage, can make electrooptic modulator be stabilized in the proper operation point through the automatic control to the electrooptic modulator bias voltage.The mode of the automatic control electrooptic modulator bias voltage that in the past adopted mainly contains following two shortcomings:
1. complex structure all has higher requirement to the speed and the precision of the components and parts of construction system, and is with high costs, and realizes that difficulty is bigger.
2. not autonomous system, need the help of additional apparatus (such as PC), be not easy in the equipment of all restricted instrument of volume, cost or other portable module class;
Summary of the invention
Technical matters: the present invention provides a kind of electrooptic modulator bias voltage control device and control method thereof; Bias voltage driver to the electrooptic modulator exploitation; Through control to the bias voltage of electrooptic modulator, reach make electrooptic modulator stable be operated in the purpose on the suitable working point.Simple in structure, be easy to realize, with low cost, need not rely on other external units, easy to use and reliable.
Technical scheme: electrooptic modulator bias voltage control device is a closed-loop control device.This device influences the working point of electrooptic modulator, and then influences the output of electrooptic modulator through the size that controller comes the DC voltage that controlling output circuit provides; The output of electrooptic modulator is accepted and is converted into and be easy to the voltage signal that receives and detect by the resistance amplifying circuit of striding of electrooptic modulator bias voltage control system; Pass through analog to digital conversion circuit again; The Be Controlled device receives; Make controller know the electrooptic modulator current working state, and according to this duty of electrooptic modulator, the output of adjustment output driving circuit.
The photodetector of this device, stride resistance amplifying circuit, analog to digital conversion circuit, controller, output driving circuit is linked in sequence; Pulsed light after the electrooptic modulator modulation through photo-coupler, is told the input end that a part of light signal connects photodetector; The bias voltage input port of the output termination electrooptic modulator of output driving circuit, the bias voltage of control electrooptic modulator.
In the electrooptic modulator bias voltage control method, the electrooptic modulator bias control device is divided into two stages to the control method of electrooptic modulator working point:
Phase one: after the electrooptic modulator bias control device powered on, the output of controller control output driving circuit made the output valve of output driving circuit scan the whole span of bias voltage fast; Simultaneously, controller is noted the pairing optical power value of each stepped voltage; Then, controller is therefrom selected the pairing stepped voltage value of minimum optical power u0, as near the stepped voltage value of right working point, as the initial bias magnitude of voltage of subordinate phase;
Subordinate phase: the initial bias magnitude of voltage of electrooptic modulator bias voltage control device since the phase one; Through increasing or reduce a small voltage steps; Observe the pairing luminous power of these magnitudes of voltage simultaneously, judge the current bias voltage value and the magnitude relationship of the righttest working point corresponding voltage value; Through the whole scan of phase one, confirmed that a comparison near the biased electrical pressure point u0 of right working point, can measure the corresponding optical power value p0 of u0; Controller control output driving circuit makes the output bias value reduce a stepping, and output bias value at this moment is u1, and the Output optical power value is p1; Controller control output driving circuit makes the output bias value increase by two steppings, and output bias value at this moment is u2, and the Output optical power value is p2; Compare luminous power p0, p1, the size of p2 if satisfy p1＜p0＜p2, explains that bias voltage u0 is bigger than the righttest operational voltage value, at this moment bias voltage value is reduced a stepping; If satisfy p2＜p0＜p1, explain that bias voltage u0 is littler than the righttest operational voltage value, at this moment bias voltage value is increased a stepping; Next, the process of " the change stepping---relatively Output optical power is big or small " of making above the repetition finds from very approaching working point, the righttest working point the most at last, and degree of closeness depends on the precision of voltage steps.
When enough hour of voltage steps, the fluctuation meeting of bias voltage very small (undulating quantity is voltage minimum step value) made being operated on the righttest working point of EOM approximately constant.
Light signal after electrooptic modulator modulation is told a part by photo-coupler, sends in the photodetector, and photodetector converts light signal to current signal, and current signal is sent into stride in the resistance amplifying circuit; Stride the resistance amplifying circuit and convert current signal to be easy to detect voltage signal, be sent to analog to digital conversion circuit; Analog to digital conversion circuit converts analog quantity into digital quantity, sends in the controller; Controller carries out computing, processing to this digital quantity, according to computing, process result, adjusts the output voltage values of output driving circuit, outputs to the bias voltage input port of electrooptic modulator, supplies with the suitable working bias voltage of electrooptic modulator.
Beneficial effect: the present invention is simple in structure, is easy to realize, need can independently not accomplish the automatic control of bias voltage by means of other optics and electricity instrument.The present invention is the working point of stable electrical photomodulator effectively, increases substantially the extinction ratio of electrooptic modulator, has broad application prospects.
Description of drawings
Fig. 1 is an electrooptic modulator bias voltage control system synoptic diagram of the present invention,
Fig. 2 is an electrooptic modulator output characteristic curve drift synoptic diagram,
Fig. 3 is the control method synoptic diagram.
Embodiment
This device comprises: photodetector 1, stride resistance amplifying circuit 2, analog to digital conversion circuit 3, controller 4, output driving circuit 5.
The photodetector part does not need device at a high speed, and speed tens KHz of photodetector can meet the demands; The dark current of this photodetector should be as far as possible little, and when driving voltage was 5V, dark current should be less than 1nA, and responsiveness is more than 0.5A/W.Could guarantee good signal-to-noise like this, guarantee that the signal that controller receives is correct, judge by accident to avoid controller.The model of photodetector used herein is GD3560J, and it is a kind of near infrared photodetector, and the spectrum sensitive band is at 1550nm place, bandwidth 400MHz; During driving voltage 5V, the dark current of this photodetector is 1nA to the maximum; Responsiveness 0.85A/W satisfies above-mentioned requirements.Photodetector converts light signal to current signal.
Striding the resistance amplifying circuit mainly is made up of an amplifier.Because the drift of electrooptic modulator working point is a ten minutes process slowly, therefore, this amplifier does not need the high speed amplifier, and with respect to speed, low noise is the problem that more should note.If it is unstable to stride the resistance amplifying circuit, can consider that adding electric capacity does phase compensation, improve the phase margin of striding the resistance amplifying circuit, can effectively avoid striding the self-excitation of resistance amplifying circuit.Should notice that simultaneously building-out capacitor can not obtain too greatly, the bandwidth of resistance amplifying circuit is striden in its influence significantly.
The controller that here uses as the TMS320F2812 microprocessor of TI company as controller.This microprocessor has 12 A/D modular converters, can satisfy demand of the present invention.The PWM ripple of the PWM ripple generation module of this microprocessor generation simultaneously through LPF, produces controlled d. c. voltage signal, and this controlled direct current signal can directly drive the bias voltage port of electrooptic modulator again through the voltage adjustment of output driving circuit.The load of the bias voltage port of electrooptic modulator generally at hundreds of kilo-ohm to a few megaohm magnitudes, so less demanding to the driving force of output driving circuit.
The structure of electrooptic modulator bias voltage control device is: the pulsed light after the electrooptic modulator modulation, through photo-coupler, tell a part of light signal, and connect the input end of photodetector; The output termination of photodetector is striden the input end of resistance amplifying circuit; Stride the input end of the output termination analog to digital conversion circuit of resistance amplifying circuit; The receiving end of the output termination controller of analog to digital conversion circuit; The input end of the output termination output driving circuit of controller, the output terminal of output driving circuit directly connects the bias voltage input port of electrooptic modulator.
Electrooptic modulator bias voltage control control procedure: the light signal after the electrooptic modulator modulation; Tell a part through photo-coupler; Send in the photodetector, photodetector converts light signal to current signal, and with current signal send into stride the resistance amplifying circuit in; Stride the resistance amplifying circuit and convert current signal to be easy to detect voltage signal, be sent to analog to digital conversion circuit; Analog to digital conversion circuit converts analog quantity into digital quantity, sends in the controller; Controller carries out computing, processing to this digital quantity, according to the result of calculation process, adjusts the output voltage values of output driving circuit, outputs to the bias voltage port of electrooptic modulator, supplies with the suitable working bias voltage of electrooptic modulator.
Control method: the electrooptic modulator bias control system is divided into two stages to the tracking of electrooptic modulator working point.Phase one, after the electrooptic modulator bias control system powers on, the output of controller control output driving circuit, the output valve that makes output driving circuit scans the whole span of bias voltage with bigger stepping.Simultaneously, controller is noted the pairing optical power value of each stepped voltage.After scanning process finished, controller was therefrom selected near the stepped voltage value of right working point, as the initial bias magnitude of voltage of subordinate phase.Subordinate phase; The initial bias magnitude of voltage of electrooptic modulator bias voltage control system since the phase one; Through increasing or reduce a small voltage steps; Observe the pairing luminous power of these magnitudes of voltage simultaneously, judge the current bias voltage value and the magnitude relationship of the righttest working point corresponding voltage value.When enough hour of voltage steps, the fluctuation meeting of bias voltage was very small, makes being operated on the righttest working point of EOM approximately constant.
Claims (1)
1. electrooptic modulator bias voltage control method; It is characterized in that in the electrooptic modulator bias control device that this control method adopts, photodetector (1), stride resistance amplifying circuit (2), analog to digital conversion circuit (3), controller (4), output driving circuit (5) and be linked in sequence; Pulsed light after the electrooptic modulator modulation through photo-coupler, is told the input end that a part of light signal connects photodetector (1); The bias voltage input port of the output termination electrooptic modulator of output driving circuit (5), the bias voltage of control electrooptic modulator;
Electrooptic modulator bias voltage control device is divided into two stages to the control method of electrooptic modulator working point:
Phase one: after electrooptic modulator bias voltage control device powered on, the output of controller control output driving circuit (5) made the output valve of output driving circuit scan the whole span of bias voltage fast; Simultaneously, controller (4) is noted the pairing optical power value of each stepped voltage; Then, controller (4) is therefrom selected the pairing stepped voltage value of minimum optical power u0, as relatively near the bias voltage value of right working point, with the initial bias magnitude of voltage of u0 as subordinate phase;
Subordinate phase: the initial bias magnitude of voltage u0 of electrooptic modulator bias voltage control device since the phase one; Through increasing or reduce a small voltage steps; Observe the pairing luminous power of these magnitudes of voltage simultaneously, judge the current bias voltage value and the magnitude relationship of the righttest working point corresponding voltage value; Through the whole scan of phase one, confirmed that a comparison near the biased electrical pressure point u0 of right working point, can measure the corresponding optical power value p0 of u0; Controller control output driving circuit makes the output bias value reduce a stepping, and output bias value at this moment is u1, and the Output optical power value is p1; Controller control output driving circuit makes the output bias value increase by two steppings, and output bias value at this moment is u2, and the Output optical power value is p2; Compare luminous power p0, p1, the size of p2 if satisfy p1＜p0＜p2, explains that bias voltage u0 is bigger than the righttest operational voltage value, at this moment bias voltage value is reduced a stepping; If satisfy p2＜p0＜p1, explain that bias voltage u0 is littler than the righttest operational voltage value, at this moment bias voltage value is increased a stepping; Next, the process that the Output optical power size is promptly compared in the change stepping of making above the repetition finds from very approaching working point, the righttest working point the most at last, and degree of closeness depends on the precision of voltage steps.
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| CN2010101735948A CN101859156B (en) | 2010-05-14 | 2010-05-14 | Bias voltage control device of electrooptic modulator and control method thereof |
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Cited By (1)
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| CN110166141A (en) * | 2019-05-07 | 2019-08-23 | 中国电子科技集团公司第三十八研究所 | A kind of negotiation control device and method of optical modulator bias voltage |
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| CN103019286A (en) * | 2012-12-18 | 2013-04-03 | 中国计量学院 | Device and method for controlling bias voltage of electrooptical modulator |
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| CN112600545B (en) * | 2021-03-03 | 2021-05-25 | 成都成电光信科技股份有限公司 | Stable state control method and system of LiNbO3 optical switch for chopped pulse laser |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6317247B1 (en) * | 1998-08-31 | 2001-11-13 | Electronics And Telecommunications Research Institute | Bias voltage stabilizing method for electricity-optical modulator based on off-level sampling |
| CN101478346A (en) * | 2009-01-21 | 2009-07-08 | 宁波春天通信工业有限公司 | Automatic control method for light carrier inhibition zero return code modulator |
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| CN110166141A (en) * | 2019-05-07 | 2019-08-23 | 中国电子科技集团公司第三十八研究所 | A kind of negotiation control device and method of optical modulator bias voltage |
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