公开(公告)号：US20190252845A1

公开(公告)日：2019-08-15

申请号：US16343412

申请日：2016-12-19

Applicant: SOUTH CHINA UNIVERSITY OF TECHNOLOGY

Inventor： Shanhui XU ,  Zhongmin YANG ,  Yuning ZHANG ,  Zhouming FENG ,  Changsheng YANG

IPC: H01S3/08 ,  H01S3/067 ,  H01S3/0941 ,  H01S3/094 ,  G01S7/481

Abstract: A multi-wavelength single-frequency optical fiber laser source for a laser radar system includes a resonant cavity composed of a high-reflectivity chirped optical fiber grating, a high gain optical fiber and a low-reflectivity chirped optical fiber grating, a single-mode semiconductor pump laser served as a pump light source, an optical wavelength division multiplexer, an optical coupler, an optical isolator, an optical circulator, an optical filter module, and a semiconductor optical amplifier. The pump light source performs optical fiber core pumping with respect to the high gain optical fiber. A portion of the wide-spectrum laser is filtered by the optical filter module to obtain a wavelength corresponding to a specific central frequency. Multi-wavelength laser lasing with a narrow linewidth and single longitudinal mode is implemented by combining a short linear resonant cavity structure and the optical filter module.

公开(公告)号：US20180097332A1

公开(公告)日：2018-04-05

申请号：US15567082

申请日：2015-12-31

Applicant: SOUTH CHINA UNIVERSITY OF TECHNOLOGY

Inventor： Shanhui XU ,  Zhongmin YANG ,  Yuanfei ZHANG ,  Zhouming FENG ,  Changsheng YANG

IPC: H01S3/067 ,  H04B10/25 ,  H01S3/08

CPC classification number: H01S3/0675 ,  H01S3/08 ,  H01S3/094053 ,  H01S3/10023 ,  H01S3/10084 ,  H01S3/10092 ,  H01S3/105 ,  H04B10/25

Abstract: A width-tunable single-frequency fiber laser light source for coherent optical orthogonal frequency division multiplexing system including a chirped fiber grating with high reflectivity, a high gain optical fiber, a chirped fiber grating with low reflectivity, a single-mode semiconductor pump laser, an optical wavelength division multiplexer, an optical coupler, an optical circulator, and a tunable optical filter module is provided. The chirped fiber grating with low reflectivity and the chirped fiber grating with high reflectivity together serve as a front cavity mirror and a back cavity mirror of a resonant cavity to realize laser oscillation. After a laser with broad spectrum output from the optical wavelength division multiplexer is split by the optical coupler, a part of the laser passes through the optical circulator to enter the tunable optical filter module. A wavelength corresponding to any nominal center frequency stipulated by the ITU-T is selected by the tunable optical filter module, with a 3 dB spectral width of less than 0.1 nm, and is then injected back into the resonant cavity via the optical circulator and the optical coupler, and the resonant cavity is subjected to a self-injection locking.