Outer cavity type electrooptically tuned laser device

Abstract

The electro-optic tunable filter used in the external cavity electro-optic tunable laser provided by the present invention is a liquid crystal Fabry-Perot cavity with an extremely short cavity length and ensures that the filter has only one fixed Fabry-Perot cavity at a period interval. The mode of the Perot cavity is selected, and the broadband membrane filters the periodic multi-peak generated by the fixed Faribeus-Perot cavity and reflects only the wavelength of one peak back to the optical resonant cavity, so that through the electro-optic tunable liquid crystal phase compensator A peak of the longitudinal mode of the optical resonator can be adjusted to the main peak of the electro-optic tunable filter, so that the laser can be output in a single mode, and the output stability and reliability of the laser can be improved.

Description

Technical field [0001] The invention involves the field of optical instruments and optical fiber communication technology, and specifically designed a laser with an external cavity electro -tone. Background technique [0002] In the era of optical communication, laser is used as a communication carrier of digital signals. Each optical frequency of the laser corresponds to each channel of communication, and each optical channel can accommodate multiple communication channels, that is, multiple frequency laser carriers, and while multiple frequency laser carriers, and,, that is, multiple frequencies laser carriers, while, frequency, is a laser carrier of multiple frequencies, and while multiple frequency laser carriers, and,, that is, multiple frequency laser carriers, and,, is multiple frequency laser carriers.The frequency of the laser will need to dynamically change with the changes of the network traffic.The international communication standard stipulates that C-Band covers 100...

AI Technical Summary

Problems solved by technology

The international communication standard stipulates that C-Band covers 100 channels at intervals of 50Ghz from 1530nm to 1570nm. As an adjustable laser for communication light sources, the existing invention includes changing the optical frequency of the laser by changing the cavity length of the DFB by heating. This invention The frequency adjustment time of the adjustable laser is more than a few seconds; some inventions add a grating in the laser cavity and use a micro-motor to change the angle of the grating to select the output frequency. The problem with this invention is that the laser is very sensitive to the vibration of the environment. , Poor reliability; Another invention is to add an acousto-optic device in the laser cavity to change the optical frequency of the laser. The problem of this invention is that the heat generated by the sound wave makes the stability of the laser worse.

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