Semiconductor laser broadband frequency locking method and frequency locking device

Abstract

The invention relates to a semiconductor laser broadband frequency locking method and frequency locking device. The frequency locking device comprises a slave laser, a slave laser temperature control module, a slave laser injection current control module, a slave optical isolation module, a slave polarization control module, a master laser, a master laser temperature control module, a master laser injection current control module, a master optical isolation module, a master polarization control module, an optical difference frequency generation module, a photoelectric conversion module, a difference frequency measurement module and a processing module. The semiconductor laser broadband frequency locking device, disclosed by the invention, can reduce frequency jitter of difference frequencies of the master laser and the slave laser caused by power supply noise efficiently, has a more flexible frequency adjusting way and a bigger frequency adjusting range, reduces adjusting difficulty, and has lower cost.

Description

technical field [0001] The invention relates to a device in the technical fields of optical communication and optical sensing, in particular to a semiconductor laser broadband frequency locking method and a frequency locking device thereof. Background technique [0002] Laser frequency locking technology has been widely used in the fields of optical fiber communication and optical fiber sensing. In some applications in these fields, the stability of the output light frequency of the laser is relatively high, and it is difficult to achieve such stability due to the high requirements on the stability of the injected current and temperature of the free-running laser. Generally, optical phase-locked loop (OPLL) technology is used to lock the frequency of the laser. [0003] After searching the existing literature, it is found that the optical phase-locked loop technology requires the linewidth of the laser to be less than 1MHz, and the delay of the entire loop must be small eno...

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Problems solved by technology

In addition, the purpose of the optical phase-locked loop is to lock the phase. For applications that only need to lock the frequency without locking the phase, such as an optical fiber sensing system based on Brillouin scattering, it is necessary to lock the frequency difference between two lasers at about 11GHz. The disadvantage of the phase loop's frequency locking range is small (generally below 3GHz), it is difficult to meet the requirements, and the optical phase locked loop technology needs to introduce an external reference signal, which also increases the complexity of the entire system

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