Device and method for detecting spectral broadening state of phase modulated laser

• Main Authors: ZHANG XINLI, YANG XIAOLIANG, TANG QUNZHI, QIN BO, WEI JIATIAN, ZHAO HAO, XING YUPENG, CHEN FENG, JIN QI, TANG SHAOYU, LYU HONGWEI
• Format: Patent
• Language: Chinese; English
• Published: 03.01.2020
• Subjects: COLORIMETRY; MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT,POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED,VISIBLE OR ULTRA-VIOLET LIGHT; MEASURING; PHYSICS; RADIATION PYROMETRY; TESTING

The invention discloses a device and method for detecting a spectral broadening state of a phase modulated laser. The device comprises an optical filter, a high-speed photodetector, a high-pass filter, and a power detector which are sequentially connected with each other; an input end of the optical filter is externally connected with the phase modulated laser, and an output end of the optical filter is connected with the high-speed photodetector; an electric signal output end of the high-speed photodetector is connected with the high-pass filter; and an output end of the high-pass filter is connected with the power detector. The method comprises the processes of time-domain modulation, high-pass filtering, and power detection. The device is low in cost, simple and compact in structure andeasy to ingrate. The method is simple to operate, can evaluate and measure the spectral width narrower than 0.1nm, can effectively judge the spectral broadening state, and is of great significance for the safety protection o