Constant current source type semiconductor laser driving circuit with automatic temperature control

Abstract

The invention relates to a constant current source type semiconductor laser driving circuit with an automatic temperature control. The circuit comprises a single-chip microcomputer control module, a constant current source driving module, a temperature control module and a power supply module; the constant current source driving module comprises an addition circuit, a constant current source circuit and a current limiting protection circuit; an output channel of the single-chip microcomputer control module is connected with the addition circuit, added by the addition circuit, and then input tothe constant current source circuit; the current limiting protection circuit and the constant current source circuit are connected with a laser; the temperature control module is connected with a semiconductor cooler of the laser; and the power supply module is used to provide power for the driving circuit. A single-chip microcomputer as a microcontroller controls the current magnitude of the laser, a current output signal output by the microcontroller is added by the addition circuit and then used to drive the laser in the constant current source way, and the current limiting protection circuit is arranged to prevent the laser from overcurrent damage. A temperature control chip automatically adjusts the temperature of the laser to ensure that the laser works the optimal temperature point.

Description

technical field [0001] The invention relates to the field of constant-source driven and automatic temperature-controlled lasers, in particular to a constant-current-source semiconductor laser drive circuit with automatic temperature control. Background technique [0002] Semiconductor lasers are current-injection semiconductor PN junction light-emitting devices, which have the characteristics of small size, light weight, direct modulation, wide bandwidth, high conversion efficiency, high reliability and easy integration, and are widely used. Since a semiconductor laser is a device with high power density and extremely high quantum efficiency, its ability to withstand electrical shocks is poor, and small changes in current will lead to large changes in optical power output and changes in device parameters. These changes directly It endangers the safe use of the device, so there are high requirements for the performance and safety protection of the driving power supply in prac...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a constant current source semiconductor laser drive circuit with automatic temperature control, aiming to solve the problem of inaccurate constant source drive and temperature control of existing semiconductor lasers

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