Wavelength Tunable Lasers

Abstract

The present application provides a wavelength-tunable laser device, which can reduce the complexity of laser wavelength tuning. The laser includes a reflective gain unit, an optical phase shifter, a coupler and a passive filter element array, the output port of the reflective gain unit is connected to the input port of the optical phase shifter; the output port of the optical phase shifter is connected to the The input port of the coupler, the first output port of the coupler is connected to the input port of the passive filter unit array, and the second output port of the coupler is the output port of the laser; the passive filter unit array includes a plurality of passive filter units In the source filter unit, any two passive filter units in the plurality of passive filter units have different wavelength tuning ranges, and the wavelength of each filter unit is linearly adjustable. At the same moment, only one passive filtering unit among the plurality of passive filtering units performs filtering.

Description

technical field [0001] The present application relates to the technical field of optical communication, and more specifically, relates to a wavelength-tunable laser. Background technique [0002] In a dense wavelength division multiplexing (dense wavelength division multiplexing, DWDM) network, generally a plurality of distributed feedback bragg grating (DFB) lasers are used to transmit a plurality of different wavelength channels. However, the wavelength emitted by each type of DFB laser is fixed, so the WDM network needs to include optical transceiver modules of DFB lasers with different emission wavelengths. On the one hand, DFB lasers need to make additional fine Bragg grating structures during the production process to adjust the emission wavelength. Limitations have made it difficult to reduce the price of DFB lasers; on the other hand, the demand for DFB lasers with different emission wavelengths has led to an increase in the types of optical transceiver modules, whic...

AI Technical Summary

Problems solved by technology

However, the wavelength emitted by each type of DFB laser is fixed, so the WDM network needs to include optical transceiver modules of DFB lasers with different emission wavelengths. On the one hand, DFB lasers need to make additional fine Bragg grating structures during the production process to adjust the emission wavelength. Limitation makes it difficult to reduce the price of DFB lasers; on the other hand, the demand for DFB lasers with different emission wavelengths leads to an increase in the types of optical transceiver modules, which in turn increases the cost in the process of stocking, installation, operation and maintenance

[0003] In the prior art, a wavelength-tunable laser is used to replace a fixed-wavelength DFB laser, but the wavelength-tunable laser is based on the vernier effect of two sets of comb filters to achieve wavelength tuning, and the wavelength tuning response is a complex multi-dimensional response graph , so the test and calibration of the wavelength is very complicated

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