Tunable semiconductor laser

A laser and semiconductor technology, applied in the laser field, can solve the problems of low output optical power and inconsistent output optical power value, and achieve the effects of good peak balance, narrow quasi-continuous tuning spectrum and simple structure

Inactive Publication Date: 2007-08-22
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0010] The purpose of the present invention is to provide a tunable semiconductor laser, which can solve the problems of inconsistent o

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Embodiment Construction

[0035] In order to achieve high output power of each channel, balanced output optical power of each channel, high dynamic wavelength switching speed, etc., tunable semiconductor lasers must have a short Bragg reflection section with a comb-shaped reflection spectrum with balanced reflection peaks. Aiming at the above point, the present invention makes a new design for the grating structure of the Bragg reflection sections at both ends. The core idea of ​​the present invention: if the comb reflection spectra with different central wavelengths are cascaded at equal intervals according to the peak intervals of the reflection spectra, then the reflection peaks with lower peaks can be compensated to balance the reflection peaks. This idea is reflected in the real space: the Bragg grating in the waveguide layer of the Bragg reflection section is composed of several grating segments, and the grating segment is composed of N (N≥3) grating sub-segments with different central wavelengths...

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Abstract

This invention discloses a tunable semiconductor laser, in which, two Prague reflection secions limit borders of a gain section at both ends, reflection sections of the front and back ends can be designed to Prague grating suitable for generating comb reflection peaks with even peak values in form, two Prague reflection sections of a laser can be designed to the form of various traces, phase shift and chirp of Prague grating and the theory of vernier caliper is used to change the refraction rate of the two reflection sections of the laser to realize quasi-continuous tune of broad spectrum.

Description

technical field [0001] The invention belongs to the technical field of lasers, and in particular relates to a tunable semiconductor laser, which is a Bragg reflection laser based on a digital cascaded grating. Background technique [0002] With the increase of network capacity and transmission rate, it is necessary to configure a fixed-wavelength laser for each wavelength channel, which will limit the expansion and flexibility of the entire network, and increase the cost of network operation, resulting in more complex network management change. In addition to limitations in the network field, fixed-wavelength lasers also limit the sensitivity, response speed, and scalability of the system in the fields of sensing systems, atmospheric communications, and measurement. Compared with fixed-wavelength lasers, tunable semiconductor lasers can greatly reduce the huge cost of light source configuration, backup and maintenance in the network, and improve the flexibility and scalabil...

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Application Information

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IPC IPC(8): H01S5/00H01S5/125
Inventor 何晓颖余永林黄德修
Owner HUAZHONG UNIV OF SCI & TECH
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