Asymmetric phase shift and apodization sampling raster and DFB laser

Abstract

The invention discloses an asymmetric phase shift and apodization sampling raster and a DFB laser. According to the technical scheme, the sampling raster is designed and manufactured based on a reconstruction-equivalent chirp technology. For asymmetric phase shift of the sampling raster, an equivalent phase shift is introduced into a sampling raster structure and is arranged at a position, approaching one end of light emitting of the laser, in a 55% to 75% of the region of the length of a cavity of a DFB semiconductor laser; for apodization, symmetric rasters with gradually changed notch depths are manufactured at the two sides of the equivalent phase shift region to change the coupling coefficient of the raster. With phase shift deviation, the optical output power of the DFB semiconductor laser can be effectively increased; and on the basis of the apodization effect realized by tooth depth changing of the raster, the modulating intensity of the refractive index near the phase shift region can be effectively reduced and the spatial hole burning effect can be effectively weakened. Generally speaking, with the provided structure, the optical output power of the DFB semiconductor laser can be effectively improved and the single longitudinal mode characteristic on the high-power operating condition can be guaranteed.

Description

technical field [0001] The invention belongs to the technical field of optoelectronics, and relates to photon integration, optical communication and many other optoelectronic information processing. In particular, it relates to an asymmetrical phase shift and apodization sampling grating and DFB semiconductor laser based on reconstruction-equivalent chirp technology. Background technique [0002] Since the beginning of the 21st century, the communication industry has shown a vigorous development, especially in recent years, with the increasing demand for online courses, document downloads, online TV, etc., the requirements for communication bandwidth are also increasing. It is getting higher and higher, and what carries this huge network communication is the optical fiber network system composed of optical fibers and various optical communication devices. At present, the optical network is mainly composed of many discrete photonic devices. Photonic devices use independent ...

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Problems solved by technology

[0006] In view of the space hole-burning effect caused by the large current injection that the phase shift may cause above, and the complex manufacturing of the asymmetric phase shift of the traditional DFB semiconductor laser, the present invention proposes an asymmetric phase shift based on reconstruction-equivalent chirp And the apodized sampling grating and its DFB laser, that is, the equivalent phase shift region based on the reconstruction-equivalent chirp technology is located in the region of 55%-75% of the length of the laser cavity, biased towards the output end of the laser, and in the equivalent phase On both sides of the shift area, a symmetrical grating structure with gradually changing tooth depths is introduced through repeated photolithography and dry etching processes to effectively reduce the spatial hole burning effect

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