基于布里渊激光腔的O-U波段平坦光频梳的噪声分析
打开文本图片集
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中图分类号：TN929.11 文献标识码：ADOI： 10.37188/CJL.20240338 CSTR：32170.14.CJL.20240338
Abstract：Optical frequency comb（OFC）have great potential as an excellent multi-wavelength light source in he field of communications.The communication system can havea transmision rate in the orderof a hundred Tbit·s-1 （204号 by combining the OFC light source with wavelength-division-multiplexing（WDM）andspace-division-multiplexing （SDM） technologies，which is of significantapplication value in 5G/6G communications，Internet of Things，andautonomous driving.For an optical communication system that integrates wavelength division multiplexing and spatial divisionmultiplexing technologies，its transmisioncapacity depends onthe numberof channels inboth WDMand SDM，the modulation symbol rate of the system，and the signal-to-noise ratio（SNR）of the light source.Through an optical system basedona Brillouin lasercavity with dispersion-engineered highly nonlinearfluorotelurite fiber，we can obtain a flat OFC with a wide range of adjustable repetition frequency，spectral coverage of the entire O-U band， andastandard deviationofthecomb intensityofless than5dB intheO-U band.Thispapercalculatesthelinewidth andfrequencynoiseof thecomb teethacrossdiferentbandsof theopticalfrequencycomb，andestablishesaBrillouin optical cavityfiltering model basedon thequantum Langevin equation to verifyits feasibility for opticalcommunication.Thecomputationalresults indicate thattheoptical frequencycomb inthe O-Ubandexhibits narrow linewidths forallcombteeth，withthesystem’snoiselow-pass filteringcharacteristicoriginatingfromthestimulatedBrillouin cavity，and the noise power spectral density at frequencies above 1 MHz being lower than 100Hz*Hz-1/2 .Compared to external-pumped microcavityopticalfrequency combs，this system generates a comb with lower frequency noise in the MHz range，demonstrating that an optical system based on a Brilouin laser cavity and dispersion-engineered highly nonlinearfluorotellurite fibercan generatealow-frequencynoiseflatoptical frequencycomb intheO-Uband for optical communication applications.
Key Words：optical frequency comb； frequency noise；quantum Langevin equation；Brillouin opticalcavity filtering model
1引言
光学频率梳（简称光频梳）在频域表现为具有等频率间隔的频率成分，在时域表现为具有固定重复频率的脉冲序列[1-3]。（剩余19170字）