Low-chirp distributed Bragg feedback tunable laser and preparation method thereof

Abstract

The invention provides a low-chirp distributed Bragg feedback tunable laser and a preparation method thereof. The low-chirp distributed Bragg feedback tunable laser comprises: a front grating region,a gain region, a phase region and a rear grating region which are arranged on a same substrate and sequentially attached at an equal height; each of the front grating region, the rear grating region and the phase region comprises a passive material layer; the passive material layers are arranged on the substrate; grating structures are further respectively arranged on the passive material layers of the front grating region and the rear grating region; the grating structures are uniform periodic distributed Bragg gratings and/or sampling gratings; and the gain region sequentially comprises a lower waveguide layer , an active layer and an upper waveguide layer from bottom to top. The low-chirp distributed Bragg feedback tunable laser has the beneficial effects that by combining with the uniform periodic distributed Bragg grating structures of the front grating region and the rear grating region with the current function of the phase region, the chirp of the tunable laser is controlled and reduced, the optical transmission distance is extended and the transmission quality is improved.

Description

technical field [0001] The disclosure relates to the field of electronic devices, in particular to a low-chirp distributed Bragg feedback tunable laser and a preparation method thereof. Background technique [0002] Tunable lasers are essential key devices in optical communication systems, which can effectively utilize the capacity of optical fibers by transmitting multiple wavelengths simultaneously. In wavelength division multiplexing (WDM) optical communication systems, tunable lasers can greatly reduce the amount of device inventory in manufacturing and operation. When using a single-wavelength light source like a distributed feedback (DFB) laser, it is necessary to prepare many lasers with different emission wavelengths, which greatly increases the cost. Using tunable lasers requires several devices to cover all wavelengths, and it is also very convenient to replace failed devices. [0003] Distributed Bragg Reflection (DBR) tunable lasers are used in WDM systems beca...

AI Technical Summary

Problems solved by technology

[0004] The existing two-segment / three-segment Bragg feedback tunable lasers are all directly modulated lasers, and their chirp characteristics limit the transmission distance of light in optical fibers, and limit the application range of tunable lasers in optical communications.

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