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조규정(KyuJung Cho),강지훈(JiHoon Kang),김인수(InSoo Kim),한부전(BuJeon Han),김민국(MinKuk Kim),김광택(KwangTaek Kim) 대한전자공학회 2010 대한전자공학회 학술대회 Vol.2010 No.6
A tunable fused fiber coupler was developed based on the thermo-optic effect of the external medium surrounding the fused taped region of the coupler. The transmission characteristics of the fused fiber coupler were strongly dependent on the refractive index of the surrounding medium due to the evanescent field interaction. A polymer with a matched refractive index and high thermo-optic coefficient was used as the external medium and its refractive index was controlled thermo-optically by a Ni-Cr coil heater. The technology was applied to a fused fiber coupler for 1310nm/1550nm wavelength division multiplexing(WDM). The good thermo-optic effects of the polymer induced by the coil heater led to a 120 nm wide tunable wavelength range with an applied electrical power of 605 mW.