Wide tuning distributed feedback laser array based on displacement grating and tuning method thereof

By using a displacement grating structure to adjust the coupling coefficient k in the DFB laser array, the problems of discontinuous control of the coupling coefficient and large influence of process error in the prior art are solved, achieving high consistency and wide wavelength tuning of the DFB laser array, and reducing process complexity and cost.

CN122456307APending Publication Date: 2026-07-24CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Patent Information

Application Number
CN202610932097.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-06-26
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

In existing DFB laser arrays, the coupling coefficient k cannot be continuously and precisely controlled, resulting in significant quantization errors in the process, poor array channel consistency, difficulty in achieving wide wavelength tuning, and high structural complexity and cost.

Method used

A wide-tunable distributed feedback laser array based on displacement gratings is adopted. By setting sidewall displacement grating structures with the same period but longitudinal displacement on both sides of the waveguide, the equivalent coupling coefficient k is continuously adjusted by adjusting the displacement amount ΔL. The output light is combined through a multi-path coupling structure and independently tuned by thermal isolation trenches and electrodes to suppress thermal crosstalk.

Benefits of technology

It achieves continuous programmable adjustment of the equivalent coupling coefficient k, improves array channel consistency and yield, reduces process complexity and cost, and covers a wider wavelength range while maintaining structural simplicity.

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Abstract

The invention belongs to the technical field of tunable lasers, and particularly relates to a wide tuning distributed feedback laser array based on displacement gratings, which at least comprises two distributed feedback laser units, and each distributed feedback laser unit adopts a side wall displacement grating structure with longitudinal relative displacement as a distributed feedback grating. The side wall displacement grating structure comprises a first side wall grating and a second side wall grating which are arranged on the two sides of the waveguide, the first side wall grating and the second side wall grating are the same in period and have displacement delta L in the propagation direction, and output light of all the distributed feedback laser units is output through the common output end after being combined through the multi-path coupling structure. The common output end is integrated with a semiconductor optical amplifier. The invention further relates to a tuning method of the wide tuning distributed feedback laser array based on the displacement grating. According to the scheme, the problems that in the prior art, the coupling coefficient k of a DFB laser array cannot be continuously adjusted, and the channel consistency is poor can be solved.
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