Demonstration of an Ultra-Wide Wavelength Tunable Band Rejection Filter Implemented with Photonic Crystal Fiber

Jinchae KIM
Gyeong-Jun KONG
Un-Chul PAEK
Kyung Shik LEE
Byeong Ha LEE

IEICE TRANSACTIONS on Electronics   Vol.E88-C    No.5    pp.920-924
Publication Date: 2005/05/01
Online ISSN: 
DOI: 10.1093/ietele/e88-c.5.920
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Joint Special Section on Recent Progress in Optoelectronics and Communications)
Category: Optical Fibers, Cables and Fiber Devices
photonic crystal fiber,  long-period fiber grating,  mode coupling,  band-rejection filter,  

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Press-induced long-period fiber gratings exhibiting strong core-to-cladding mode coupling were formed in photonic crystal fiber. Only one resonance peak was observed over a 600 nm spectral range and the resonant wavelength was tuned over the whole range by tilting a groove plate before pressing the fiber. The resonant wavelength decreased with increasing periodicity of the grating, which was opposite to the trend of the step-index conventional optical fiber. Meanwhile, the resonant wavelength increased with increasing the ambient refractive index, which was also opposite to that of the conventional optical fiber.