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Automatic power and temp. controller for pumping laser

A temperature control device and automatic power control technology, applied in laser cooling devices, temperature control, lasers, etc., can solve the problems of rising cost, low efficiency, large heat generation, etc., to reduce power consumption and volume, facilitate debugging, and achieve accurate control effect

Inactive Publication Date: 2005-11-09
SHANGHAI UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional APC and ATC circuits adopt the method of negative feedback and linear drive. The circuit is simple, but the high-power drive triode or op amp is used as the power drive element, which has low efficiency and high heat generation. Additional heat dissipation measures such as heat sinks are required.
Moreover, traditional analog ATC and APC circuits need to use some large precision potentiometers in order to adjust parameters, which makes debugging difficult, costs increase, and miniaturization cannot be achieved
With the continuous increase of the power of the pump laser (up to 300mW, the drive current is above 800mA), the power consumption and volume of the traditional analog control circuit can no longer meet the requirements of modularization, miniaturization and high power of EDFA, so it is necessary to The pump control circuit is improved to meet these requirements

Method used

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  • Automatic power and temp. controller for pumping laser
  • Automatic power and temp. controller for pumping laser
  • Automatic power and temp. controller for pumping laser

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Embodiment Construction

[0017] The overall block diagram of the preferred embodiment of the automatic power and temperature control device of the pump laser of the present invention is as follows figure 1 shown.

[0018] figure 1 The upper part is the APC circuit, which is composed of photocurrent detection 2, ADμC832 microcontroller 22, PWM generation and driving circuit 6. PD1 converts the pumped backlight signal into a photocurrent proportional to the pump power, which is converted into a voltage signal by the photocurrent detection circuit 2, and the A / D 3 inside the microcontroller samples the voltage signal and converts it into optical power, which is the same as the preset The pump power is compared, and the PID algorithm is called to calculate the error voltage. The D / A 5 outputs the error voltage to control the external PWM generation and drive circuit 6, and drives the pump laser LD 8 after filtering 7.

[0019] There are 8 channels of 12-bit A / D 3 and 2 channels of 12-bit D / A 5 inside th...

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PUM

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Abstract

This invention relates to a power and temperature automatic control device of a pump laser including an automatic power control circuit and an automatic temperature control circuit, the two of which apply a pulse-width modulation way to drive the pump laser and a freezer separately so as to realize automatic temperature and power controls of the pump laser, which reduces the power loss and volume of its controller greatly. The device is controlled by a single-chip processor, which sets and fetches various parameters.

Description

technical field [0001] An automatic power and temperature control device for an erbium-doped fiber amplifier (EDFA) pump laser, which uses pulse width modulation (PWM) to realize the automatic temperature control (ATC) and automatic power control (APC) of the pump laser, and uses a single-chip microcomputer Control the entire device. Background technique [0002] Since its appearance in the 1990s, Erbium-doped fiber amplifier (EDFA) has become a core component of optical fiber communication network, and is widely used in various networks such as DWDM long-distance optical communication trunk line, all-optical metropolitan area network, and optical fiber cable TV network. The optical gain module of EDFA is mainly composed of optical part and circuit part. The optical part includes erbium-doped fiber, pump laser and various passive devices. The circuit part mainly includes laser control circuit, input and output light detection circuit, etc. [0003] In EDFA, the pump laser i...

Claims

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Application Information

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IPC IPC(8): H01S3/0941
Inventor 宋英雄李迎春张瑞峰陈健许志荣顾建苏皆磊
Owner SHANGHAI UNIV
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