Distributed feedback laser and preparation method thereof

By designing a segmented apodized Bragg coupling grating structure and a quarter-wavelength phase shift region, the problems of high manufacturing complexity and increased linewidth in existing distributed feedback lasers are solved, achieving uniform photon density and narrow linewidth laser output, thus reducing manufacturing difficulty and cost.

CN121840355APending Publication Date: 2026-04-10PENG CHENG LAB
0 Cites 0 Cited by

Patent Information

Application Number
CN202511683597.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-11-17
Publication Date
2026-04-10

AI Technical Summary

Technical Problem

The existing distributed feedback laser's grating structure design relies on high-precision continuous gradual change of coupling coefficient and multi-phase shift alignment, resulting in high manufacturing complexity, high cost and low mass production yield. At the same time, there is a problem of longitudinal spatial hole burning effect leading to linewidth increase.

Method used

A segmented apodized Bragg grating structure is adopted. By dividing the Bragg grating into two segments, each with a different fixed coupling coefficient, and setting a quarter-wavelength phase shift region at the center of the resonant cavity, the coupling coefficient and length ratio of the grating are adjusted to achieve powerful control of the optical field in the cavity and suppress the longitudinal spatial hole burning effect.

Benefits of technology

It achieves uniform photon density distribution under different end-face reflectivities and cavity lengths, significantly reducing manufacturing complexity and sensitivity to process tolerances, obtaining narrower laser linewidths, and improving the applicability and mass production yield of the laser.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention relates to the technical field of photoelectrons, and discloses a distributed feedback laser and a preparation method thereof, and the distributed feedback laser comprises a substrate layer, a separation limiting heterostructure, a coupling grating layer, a dielectric layer, an anode and a cathode. Bragg gratings are sectionally arranged on the side wall of the ridge waveguide of the coupling grating layer along the cavity length, each grating at least comprises two grating sections with different coupling coefficients, and a quarter-wavelength phase shift region is arranged at the center of the cavity; the end face of the cavity can adopt an anti-reflection or high-reflection coating film combination. The coupling coefficient and length ratio of each section is determined according to the end face reflectivity, target coupling coefficient distribution is achieved by changing parameters such as the side wall etching depth, the uniformity of photon density distributed along the cavity length is improved, the longitudinal space hole burning effect is restrained, and narrower line width is achieved while single longitudinal mode output is kept; the distributed feedback laser is simple in structural technological process, low in requirement for mask and etching precision and suitable for narrow-linewidth light sources with different cavity lengths and end face reflection conditions.
Need to check novelty before this filing date? Find Prior Art