Tunable semiconductor laser unit

Abstract

The invention discloses a tunable semiconductor laser unit which is composed of a front grating area, an active area, a phase area and a rear grating area, wherein the front grating area and the rear grating area are designed into a novel Bragg grating; the grafting is used or generating a comb reflection response with a balanced reflective peak, and a reflective index value of the grating area is changed by injecting current to the front grating and the rear grating by the vernier caliper effect so as to achieve quasi continuous tuning of a wide spectrum. The laser unit has the advantages that the output optical power is high; the optical power uniformity of each channel is good, and the switching speed of dynamic wavelength is high. Two Bragg reflection sections of the laser unit can also be designed into various apodisation and chirping forms of the Bragg grating. The laser unit also can be integrated with apparatuses such as a semiconductor light amplifier and an electro-absorption modulator.

Description

technical field [0001] The invention relates to a tunable semiconductor laser, which belongs to the field of laser technology. The laser is a Bragg reflection laser based on interleaved multi-phase-shift sampling gratings. Background technique [0002] With the development of optical communication, especially the continuous development of optical communication network, research on Dense Wavelength Division Multiplexing (DWDM) technology and even Wavelength Division Multiplexing (WDM) / Optical Time Division Multiplexing (OTDM) system has achieved rapid development. , so there is a higher challenge to the flexibility of the light source and the system. A tunable semiconductor laser can replace multiple fixed-wavelength lasers, thus reducing the manufacturing cost of the laser, simplifying the module packaging process, and reducing the cost of backup and inventory management; in optical network systems, the wavelength of the tunable laser can be adjusted The performance can all...

AI Technical Summary

Problems solved by technology

[0010] The object of the present invention is to provide a tunable semiconductor laser, which can improve the inconsistency of the output optical power of each wavelength channel when the existing laser is tuned, and can realize wide wavelength range tuning and fast wavelength switching. The grating area can use very Manufactured by mature holographic exposure method, which has the advantage of simple process

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