Stable light source light power output apparatus with full optical fiber structure
An output device and optical power technology, applied in the direction of the device controlling the output parameters of the laser, etc., can solve the problems of the light source cannot be handled flexibly, the anti-disturbance ability is poor, the dynamic range is small, etc., to achieve flexible and diverse control methods, strong anti-disturbance ability, Good insulation performance
Inactive Publication Date: 2008-04-30
BEIHANG UNIV
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Problems solved by technology
[0003] (1) There is no ability to automatically correct the deviation, and its control amount will change with time
[0004] (2) Poor anti-disturbance ability, fluctuations in power supply voltage, electromagnetic interference, and load changes will have a greater impact on the power output of the light source
[0005] (3) It is extremely sensitive to the ambient temperature. In the full temperature working environment, the optical power output has a great change. In severe cases, the system cannot work normally
[0006] (4) The control of the light source cannot be handled flexibly, and the control and protection measures for the light source cannot be realized
The disadvantages are: small dynamic range, poor stability, single control method
Method used
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[0021] See figure 1 As shown, the present invention is a digital automatic optical power control device using full optical fiber connection, and the optical power control device is composed of a light source, a coupler, a PIN detector and a signal processing unit. The light source is fused with an incoming fiber of the coupler, and the pigtail of the photodetector is fused with an outgoing fiber of the coupler; the PIN detector outputs a light intensity current signal to the I / V conversion module in the signal processing unit, The light intensity and voltage signal output by the I / V conversion module is converted into a digital quantity by the on-chip A / D converter in the signal processing unit DSP, and the control signal is output to the D / A conversion after the PID algorithm is processed by the DSP The D / A converter converts the digital control signal output by the DSP into an analog voltage signal and outputs it to a controlled constant current source to generate a driving ...
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The invention discloses the stable light source light power outputting device with the whole light fine. It is compounded of the light source, the coupling implement, PIN detector and the signal dealing unit, the said signal dealing unit includes the I / V transitional circuit, DSP processor, D / A transitional circuit and the light source driving circuit; the light source melts with the one entering fine of the coupling, the trail fine of the PIN detector melts with the emerging fine of the coupling, the PIN detector exports the light strong current signal I to the I / V transitional circuit to conduct the circuit transition, the light strong pressure signal is exported through the I / V transitional circuit, the digital pressure signal VD is formed through the A / D transitional implement in the chip of the DSP processor, the said digital pressure signal VD is conducted by the PID arithmetic process in the DSP processor to export the digital controlling signal to the D / A transitional circuit, the D / A transitional circuit exports the simulating controlling pressure signal VA to drive the light source driving circuit, the circuit signal IA of the driving light source is produced to make the light source working in the set light power output point.
Description
technical field [0001] The invention relates to a digital automatic optical power control device, in particular to a driving control for adjusting a light source by using a negative feedback principle to keep the output of optical power stable. The device utilizes the characteristic that the optical power fluctuation causes the detector photocurrent to change, detects the change amount of the photocurrent, changes the driving current of the light source through the negative feedback control of the circuit, and suppresses the fluctuation of the optical power, so as to achieve the purpose of stabilizing the optical power output of the light source. Background technique [0002] The automatic power control (APC) device is an important part of the new light source. To make the semiconductor laser overcome the influence of factors such as power supply fluctuations and device aging, and ensure the stability of the laser output power, it is necessary to design the automatic power co...
Claims
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IPC IPC(8): H01S5/06
Inventor 张晞张春熹贾豫东杨远洪欧攀李彦
Owner BEIHANG UNIV