Spectral shape tunable band-rejection filter using a long-period fiber grating with divided coil heaters |
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Authors: | Jun Kye Bae Sang Hyuck Kim Jun Hee Kim Jinho Bae Sang Bae Lee Je-Myung Jeong |
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Affiliation: | Photonics Res. Center, Korea Inst. of Sci. & Technol., Seoul, South Korea; |
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Abstract: | We have developed a new type of tunable band rejection filter, which provides high spectral-shaping flexibility in a wide tuning range. The filter consists of a long-period fiber grating (LPFG) with divided coil heaters. Each of the divided coil heaters is controlled individually to adjust a temperature distribution along the LPFG and to modify the spectral shape of the LPFG filter. The tunable band rejection filter is demonstrated to function properly when applied as an erbium-doped fiber amplifier gain-flattening filter. |
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