Highly tunable large-core single-mode liquid-crystal photonic bandgap fiber |
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Authors: | Alkeskjold Thomas Tanggaard Laegsgaard Jesper Bjarklev Anders Hermann David Sparre Broeng Jes Li Jun Gauza Sebastian Wu Shin-Tson |
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Affiliation: | Department of Communications, Optics, and Materials, Technical University of Denmark, Lyngby. ttl@com.dtu.dk |
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Abstract: | We demonstrate a highly tunable photonic bandgap fiber, which has a large-core diameter of 25 microm and an effective mode area of 440 microm2. The tunability is achieved by infiltrating the air holes of a photonic crystal fiber with an optimized liquid-crystal mixture having a large temperature gradient of the refractive indices at room temperature. A bandgap tuning sensitivity of 27 nm/degrees C is achieved at room temperature. The insertion loss is estimated to be less than 0.5 dB and caused mainly by coupling loss between the index-guided mode and the bandgap-guided mode. |
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