Anti-back-reflection high-contrast laser and optical fiber coupling system

Abstract

The invention discloses an anti-back-reflection high-contrast laser and an optical fiber coupling system. The anti-back-reflection high-contrast laser comprises a first reflector layer and a light-emitting layer which are arranged in a stacked mode, the light-emitting layer is provided with a plurality of light-emitting areas, and laser beams of the light-emitting areas are emitted through an emitting window in an emitting layer; and the first reflector layer comprises a grating region, the grating region comprises a first diffraction region and a second diffraction region arranged around the first diffraction region, and the orthographic projection of the emergent window and the orthographic projection of the first diffraction region on the emergent layer are partially overlapped. According to the anti-back-reflection high-contrast laser provided by the embodiment of the invention, by adjusting the structure of the grating layer and the position of the emergent window, the intensity distribution of external interference light after diffraction can be controlled, the intensity of a chip light-emitting area can be reduced, and the interference of the external light to the light field distribution lasing of the VCSEL can be reduced or even eliminated, so that the influence of the ambient light on the surface of the VCSEL can be reduced, the signal-to-noise ratio is improved, and the transmission rate and distance are improved.

Description

technical field [0001] This application generally relates to the field of optoelectronic technology, and specifically relates to an anti-backreflection high-contrast laser and an optical fiber coupling system. Background technique [0002] Vertical-cavity surface-emitting laser (Vertical-Cavity Surface-Emitting Laser; VCSEL) has the advantages of high speed, high integration, and high cost performance. One of the new light sources in the field of optical communication. Compared with the traditional Bragg reflector (Distributed Bragg Reflector; DBR), (High Contrast Grating; HCG) can significantly reduce the divergence angle, which is beneficial to the optical coupling efficiency. [0003] The back reflection is generated by any interface or scattering center in the optical network. The back reflection can propagate along the optical path or light guide, and does not need to be sent from the closest place of the signal source. When the back reflected optical signal enters the...

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Problems solved by technology

[0003] The back reflection is generated by any interface or scattering center in the optical network. The back reflection can propagate along the optical path or light guide, and does not need to be sent from the closest place of the signal source. When the back reflected optical signal enters the resonant cavity, the resonance condition The change of the laser often causes a large change in the laser output, which interferes with the laser and reduces the signal-to-noise ratio of the laser.

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