A Graded Ridge Waveguide Distributed Feedback Laser with High Single-Mode Yield

A distributed feedback and distributed feedback technology, applied in the field of lasers, can solve the problems of long laser cavity, high threshold, low diffraction efficiency of second-order grating, etc., and achieve the effect of improving single-mode yield and solving low yield.
CN104600561BActive Publication Date: 2018-03-27HUAZHONG UNIV OF SCI & TECH
1 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
HUAZHONG UNIV OF SCI & TECH
Publication Date
2018-03-27

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

A distributed feedback laser with high single-mode yield, including a laser resonator and a Bragg grating; the Bragg grating is a chirped grating or an equivalent chirped grating, and is located in a resonant cavity, and its equivalent refractive index is along the length of the resonant cavity. The direction is changed; the mode gain of the laser changes along the length direction of the resonant cavity; the laser outputs a single longitudinal mode. Because the present invention adopts the chirped grating or equivalent chirped grating, the mode gain of the laser is changed along the direction of the cavity length at the same time, and by coating the high reflection film and the anti-reflection film on the two ends of the laser respectively, the Bragg resistance of the laser can be improved. With the specified side, that is, the probability of laser lasing on the blue side or the red side, so as to improve the single-mode yield of the laser. The technical scheme of the invention can effectively solve the problem of low single-mode yield of the existing DFB laser, and the manufacturing process of the DFB semiconductor laser is almost the same as that of the traditional ridge waveguide DFB laser, so the manufacturing cost is equivalent.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the field of lasers, and more specifically relates to a distributed feedback laser with high single-mode yield. Background technique

[0002] With the rapid development of optical communication technology, the demand for semiconductor lasers is increasing day by day. Since the distributed feedback semiconductor laser (DFB-LD) can suppress mode hopping in a wider operating temperature and operating current range and ensure a single longitudinal mode output, it is widely used in the field of optical communication.

[0003] The general DFB semiconductor laser uses a uniform grating, and its feedback method is mainly generated by using the periodic change of the refractive index in the grating, that is, index-coupling. In the ideal case where the reflectance of the end face is 0, there are two degenerate longitudinal modes in this laser, and the two longitudinal modes are symmetrically distributed on both sides of the Bragg wavele...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More