Bae, JK Kim, SH Kim, JH Bae, J Lee, SB Jeong, JM 2024-01-21T09:13:14Z 2024-01-21T09:13:14Z 2021-09-03 2003-03 1041-1135 https://pubs.kist.re.kr/handle/201004/138803 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. English IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC Spectral shape tunable band-rejection filter using a long-period fiber grating with divided coil heaters Article 10.1109/LPT.2002.807955 1 IEEE PHOTONICS TECHNOLOGY LETTERS, v.15, no.3, pp.407 - 409 IEEE PHOTONICS TECHNOLOGY LETTERS 15 3 407 409 scie scopus 000181267500017 2-s2.0-0037339608 Engineering, Electrical & Electronic Optics Physics, Applied Engineering Optics Physics Article band-rejection filter divided heater long-period fiber gratings (LPFGs) tunable