正交偏振分插复用多波长布里渊随机光纤激光器  

Orthogonal Polarization Interleaving Multi⁃wavelength Brillouin Random Fiber Laser

作　　者：吴科帅 王春华 谷祥 Wu Keshuai;Wang Chunhua;Gu Xiang(Key Laboratory of Specially Fiber Optics and Optical Access Networks,School of Communication and Information Engineering,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学通信与信息工程学院特种光纤与光接入网重点实验室,上海200444

出　　处：《中国激光》2023年第23期104-112,共9页Chinese Journal of Lasers

基　　金：国家自然科学基金(61575118,62075123)。

摘　　要：相对于常见的多波长激光器,正交偏振多波长激光器可输出相邻波长偏振正交的多波长激光,可有效消除密集波分复用(DWDM)系统中相邻波长信道的干扰,在光纤传感、光纤通信和光谱检测领域中具有广泛应用。基于保偏光纤(PMF)中的受激布里渊散射(SBS)的轴向偏振牵引效应,设计并实现了具有单倍和2倍布里渊频移(BFS)间隔的偏振正交分插复用多波长布里渊随机光纤激光器(OPI-MWBRFL)。首先,采用3 km长PMF布里渊随机激光腔,实现了7个波长的单BFS间隔正交多波长激光输出,相邻波长偏振消光比不低于33 dB。其次,通过级联21 km长距离单模光纤(SMF)布里渊随机激光腔和3 km长PMF随机腔,实现了具有2倍BFS间隔的正交多波长(4个波长)激光输出,相邻波长偏振消光比可达34 dB。所实现的偏振正交方案由PMF中的SBS轴向偏振牵引的物理机理决定,因此不仅可以实现优良的波长间偏振正交,而且对系统的偏振准直要求低,具有良好的工作稳定性。系统监测实验验证了OPI-MWBRFL系统的良好稳定性。Objective Multi-wavelength Brillouin random fiber lasers(MBRFLs)are a new type of laser based on a random distributed feedback resonant cavity and the gain of the stimulated Brillouin scattering(SBS)effect.Because the SBS effect in MBRFLs have excellent properties,such as higher gain,lower threshold,narrower gain spectrum width,and higher sensitivity to environmental factors,it has been widely utilized in the study of fiber lasers.However,most studies are limited to non-polarization parameters,including wavelength,laser linewidth,intensity noise,and phase noise,and are rarely related to the polarization characteristics.In this study,we propose two novel orthogonal polarization interleaving multi-wavelength Brillouin random fiber lasers(OPIMWBRFLs)that emit orthogonally polarized multi-wavelength light with single and double Brillouin frequency shift(BFS)intervals,based on the axial polarization pulling property of the SBS effect in polarization-maintaining fibers(PMFs).This system yields highly stable orthogonally polarized light,with an adjacent polarization extinction ratio as high as 33 dB.Compared with conventional MBRFLs,OPI-MWBRFLs can provide multi-wavelength lasing light with orthogonal polarizations between adjacent wavelengths,thus effectively eliminating inter-channel interference in dense wavelength division multiplexing(DWDM)systems with potential application in the fields of fiber sensing,optical fiber communication,and optical spectrum analysis.Methods In this study,we design two novel OPI-MWBRFLs that emit orthogonally polarized multi-wavelength light with single and double BFS intervals.First,based on the polarization vector propagation equation and the simplified intensity equation of the pump and signal lights of the SBS effect in PMFs,which theoretically indicate that the SBS effect in the PMF has an explicit axial polarization-pulling behavior.Second,we deduce the relationship between the traction direction and the state of polarization(SOP)of incident pump light,SBS gain,pump light polarizat

关 键 词：激光器 正交偏振分插复用 保偏光纤 非线性偏振牵引 受激布里渊散射 

分 类 号：TN248.1[电子电信—物理电子学]