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中文摘要：
基于光纤耦合器的波长特性,分析了光纤耦合器作为梳状滤波器的光谱特性;将长度不同的双芯光纤（twin-core fiber,TCF）熔接在两根单模光纤（single mode fibors,SMF）之间,实验制得具有不同峰值波长间隔的基于双芯光纤耦合器的全光纤型梳状滤波器,其消光比可达25dB.首次使用CO2激光对其进行光谱调节,调节导致光谱向长波方向漂移和消光比的变化.这种调节是基于CO2与光纤相互作用时的残余应力释放和熔融变形机理,使用氢载TCF可以在相同实验参数下得到更大的波长调节激光.
英文摘要：
According to the wavelength characteristic of fiber coupler,its spectrum characteristics was analysed as a comb filter,and all-fiber comb-filter based on fiber couplers with different wavelength intervals were experimentally fabricated by splicing a section of single mode twin-core fiber（TCF） of different lengths between two single mode fibers（SMFs）,and the extinction ratio is 25 dB.CO2 laser was used to trim the wavelength firstly,which results in the spectrum shifting to long wavelength and the change of extinction ratio.The trimming is based on the mechanism of residual stress and melting deformation between fiber and CO2 laser,and hydrogen-loaded TCF was used to improve the trimming efficiency.
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