Work protection system for DFB (distributed feed back) laser

Abstract

The invention discloses a work protection system for a DFB (distributed feed back) laser. A laser diode and a semiconductor refrigerator are arranged in the DFB laser; the work protection system comprises a constant-current protection system and a temperature-constant protection system, wherein the constant-current protection system comprises a constant-current voltage comparison circuit, a switching circuit and a constant-current drive circuit; the constant-temperature protection system comprises a temperature-constant voltage comparison circuit and a temperature-constant drive circuit. The work protection system for the DFB laser has the following benefits: the on / off of the constant-current drive circuit is controlled by arranging the constant-current voltage comparison circuit and the switching circuit, and the on / off of the constant-temperature drive circuit is controlled by arranging the temperature-constant voltage comparison circuit, so that hardware protection is provided for the DFB laser, and the hardware protection responses quickly and works stably; three types of sampling circuits are arranged for monitoring the work of the laser in real time, and the constant-current drive circuit and the constant-temperature drive circuit can be controlled remotely, so that software protection is provided for the DFB laser, and the software protection is convenient to operate.

Description

technical field [0001] The invention belongs to the technical field of DFB lasers, and in particular relates to the driving and protection technology of DFB lasers. Background technique [0002] Distributed Feedback Laser (DFB, Distributed Feed Back) is an ideal electron-photon direct conversion device with high quantum efficiency, and small changes in current and temperature will lead to great changes in output optical power. As a current-driven device, DFB lasers are required to have the lowest electrical noise and high stability in practical industrial applications, because the fluctuation of the driving current will not only cause laser intensity noise, but also cause output wavelength noise. The broadening of the spectral linewidth, therefore, a high stability of the drive current is the premise of stable output power. In addition, DFB lasers are temperature-sensitive devices, and fluctuations in ambient temperature can not only cause fluctuations in the supply current...

AI Technical Summary

Problems solved by technology

Its defect is that when the software fails or an error occurs, the drive current and temperature of the DFB laser will lose control, which will lead to safety hazards

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