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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.
Based on the wavelength characteristics of the fiber coupler, the spectral characteristics of the fiber coupler as the comb filter were analyzed. The twin-core fibers (TCF) with different lengths were fused on two single mode fibers (SMF ), Experimentally fabricated all-fiber comb filter based on a two-core fiber coupler with different peak wavelength intervals achieves an extinction ratio of up to 25 dB.Firstly, CO2 laser is used to adjust the spectrum to regulate the spectrum to a long wave Direction drift and extinction ratio.This adjustment is based on the mechanism of residual stress relaxation and melting deformation during the interaction between CO2 and optical fiber.Using hydrogen-loaded TCF can obtain larger wavelength-controlled laser under the same experimental parameters.