External cavity electro-optic tunable laser

Abstract

The invention provides an outer cavity type electrooptically tuned laser device, wherein an adopted electrooptically tuned filter adopts a liquid crystal Fabry-Perot cavity with very short cavity length and can ensure that only one mode of the fixed Fabry-Perot cavity of the filter is selected within one period interval, a broadband film is used for filtering periodic multiple waves generated by the fixed Fabry-Perot cavity and only reflecting wavelength of one peak to an optical resonant cavity, then one peak of a longitudinal mode of the optical resonant cavity can be adjusted to a main peak of the electrooptically tuned filter through an electrooptically tuned liquid crystal phase compensator, then single mold output of laser can be ensured, and the stability and reliability of the output of the laser can be improved.

Description

technical field [0001] The invention relates to the technical fields of optical instruments and optical fiber communication, and specifically designs an external-cavity electro-optic adjustable laser. Background technique [0002] In the era of optical communication, lasers are used as the carrier of digital signals. Each optical frequency of the laser corresponds to each channel of communication. Each optical fiber can accommodate multiple communication channels, that is, laser carriers of multiple frequencies. The frequency of the laser will need to be changed dynamically as the network traffic changes. 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 adjustabl...

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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