Measurement system for passive spectrum of distribution feedback type optical fiber laser

Abstract

A distributed feedback fiber laser passive spectrum measurement system, which includes: sawtooth wave drive, the distributed feedback semiconductor laser is driven by a sawtooth wave current to generate a laser beam that is input to the fiber coupler, and the fiber coupler is connected to the distributed feedback semiconductor Laser, the first fiber isolator, the second fiber isolator and the distributed feedback fiber laser; the light entering the distributed feedback fiber laser is reflected and transmitted by the device, and the reflected light passes through the fiber coupler, the first fiber in turn The isolator and the first photodetector realize photoelectric conversion, and the transmitted light is input to the third photodetector through the third optical fiber isolator to realize photoelectric conversion. The first division circuit receives the electrical signal output from the first photodetector and the second photodetector and outputs it to the oscilloscope; the second division circuit receives the electrical signal output from the third photodetector and the second photodetector and outputs it to the oscilloscope.

Description

technical field [0001] The invention relates to a measurement system for passive fine spectrum observation of distributed feedback fiber lasers. The system can achieve higher wavelength resolution and can observe higher precision that cannot be achieved by current spectrometers, especially for distributed feedback The observation of the lasing window of the passive spectrum of the fiber laser provides an effective measurement method. Background technique [0002] Distributed feedback fiber laser (DFB-FL) has stable single-mode operating characteristics, narrow linewidth, long coherence length, small size, easy networking, wavelength division multiplexing, and stable structure. It has a wide range of applications and huge development space in the sensory field. In 1994, J.T.Kringlebotn et al. [1] first reported that a distributed feedback (DFB) fiber laser was produced by introducing a phase shift by heating the grating. In 1995, A. Asseh [2] introduced a permanent phase sh...

AI Technical Summary

Problems solved by technology

[0023] Aiming at the problem that the existing spectrometer precision is not high enough and the need for DFB-FL laser passive fine spectrum fine spectrum measurement, the present invention designs a distributed feedback fiber laser passive spectrum measurement system based on semiconductor laser wavelength fine-tuning technology , using the principle of continuous fine-tuning of the wavelength of the DFB semiconductor laser by the injection current, the high-precision measurement of the passive spectrum of the DFB-FL is realized by laser scanning the DFB-FL, and the accuracy can reach 10 -3 pm level

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