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http://dx.doi.org/10.3807/KJOP.2010.21.5.195

Development of a Ultra Broadband Optical Coupler Based on a Photonic Crsytal Fiber  

Yoon, Min-Seok (Department of Physics, Hanyang University)
Lee, Sang-Bae (Korea Institute of Science and Technology)
Han, Young-Geun (Department of Physics, Hanyang University)
Publication Information
Korean Journal of Optics and Photonics / v.21, no.5, 2010 , pp. 195-199 More about this Journal
Abstract
A broadband optical coupler with a broad bandwidth of 1000 nm based on a photonic crystal fiber (PCF) is investigated. The PCF has 6 layers of air hole structures and a diameter of $130{\mu}m$. The PCF-based coupler is fabricated by using a fused biconical tapering method based on heating and elongation processes. Changing temperature and an elongation length can control the bandwidth and the bandedge wavelength of the PCF-based broadband coupler. The diameter of the fused region in the PCF-based coupler was measured to be $23{\mu}m$. The fabricated PCF-based coupler has a nearly-flat coupling ration of 3-dB in a broad bandwidth of 1000 nm, which is wider than that of the previously reported PCF-based coupler and that of the single-modefiber-based coupler. Since the resolution of optical coherence tomography system is proportional to the bandwidths of both an optical light sources and an interferometer, the fabricated PCF-based broadband optical coupler has a great potential for realization of a broadband interferogram.
Keywords
Photonic crystal fiber; Optical coupler; Optical coherence tomography;
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