Abstract

We demonstrate a highly tunable photonic bandgap fiber, which has a large-core diameter of 25μm and an effective mode area of 440μm2. 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/°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.

© 2006 Optical Society of America

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