发光学报2025，Vol.46Issue(6)：1139-1150,12.DOI:10.37188/CJL.20240338
基于布里渊激光腔的O-U波段平坦光频梳的噪声分析
Noise Analysis of a Flat Optical Frequency Comb in O-U Band Based on a Brillouin Laser Cavity
摘要
Abstract
Optical frequency comb(OFC)have great potential as an excellent multi-wavelength light source in the field of communications.The communication system can have a transmission rate in the order of a hundred Tbit·s-1 by combining the OFC light source with wavelength-division-multiplexing(WDM)and space-division-multiplexing(SDM)technologies,which is of significant application value in 5G/6G communications,Internet of Things,and au-tonomous driving.For an optical communication system that integrates wavelength division multiplexing and spatial division multiplexing technologies,its transmission capacity depends on the number of channels in both WDM and SDM,the modulation symbol rate of the system,and the signal-to-noise ratio(SNR)of the light source.Through an optical system based on a Brillouin laser cavity with dispersion-engineered highly nonlinear fluorotellurite fiber,we can obtain a flat OFC with a wide range of adjustable repetition frequency,spectral coverage of the entire O-U band,and a standard deviation of the comb intensity of less than 5 dB in the O-U band.This paper calculates the linewidth and frequency noise of the comb teeth across different bands of the optical frequency comb,and establishes a Brillouin optical cavityfiltering model based on the quantum Langevin equation to verify its feasibility for optical communica-tion.The computational results indicate that the optical frequency comb in the O-U band exhibits narrow linewidths for all comb teeth,with the system's noise low-pass filtering characteristic originating from the stimulated Brillouin cavity,and the noise power spectral density at frequencies above 1 MHz being lower than 100 Hz·Hz-1/2.Compared to external-pumped microcavity optical frequency combs,this system generates a comb with lower frequency noise in the MHz range,demonstrating that an optical system based on a Brillouin laser cavity and dispersion-engineered highly nonlinear fluorotellurite fiber can generate a low-frequency noise flat optical frequency comb in the O-U band for optical communication applications.关键词
光频梳/频率噪声/量子郎之万方程/布里渊光学腔滤波模型Key words
optical frequency comb/frequency noise/quantum Langevin equation/Brillouin optical cavity filtering model分类
电子信息工程引用本文复制引用
金冠宇,陈禹先,张绪成,贾志旭,孟凡超,秦伟平,秦冠仕..基于布里渊激光腔的O-U波段平坦光频梳的噪声分析[J].发光学报,2025,46(6):1139-1150,12.基金项目
国家自然科学基金(62090063,U24A20305,62075082,U20A20210,61827821,U22A2085,62235014,62205121) Supported by National Natural Science Foundation of China(62090063,U24A20305,62075082,U20A20210,61827821,U22A2085,62235014,62205121) （62090063,U24A20305,62075082,U20A20210,61827821,U22A2085,62235014,62205121）
