Bae, JK Bae, JH Kim, SH Park, N Lee, SB 2024-01-21T05:01:45Z 2024-01-21T05:01:45Z 2021-09-03 2005-06 1041-1135 https://pubs.kist.re.kr/handle/201004/136431 We introduce a new type of dynamic erbium-doped fiber amplifier (EDFA) gain-flattening filter using two long-period fiber gratings (LPFGs) equipped with divided coil-heaters. By individually controlling each of the 64 segments of coil heaters over the grating, we adjusted the temperature distribution of LPFGs piecewise-uniformly, thus, to maintain optimum gain-flatness for different EDFA operation conditions. By controlling the different cladding modes for each LPFGs, we also achieve enhanced controllability/flexibility for the filter spectrum of dynamic LPFG. Wide dynamic-range gain/power control with less than 0.8-dB signal ripples, over 30 nm was demonstrated. English IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PERIOD FIBER GRATINGS Dynamic EDFA gain-flattening filter using two LPFGs with divided coil heaters Article 10.1109/LPT.2005.847439 1 IEEE PHOTONICS TECHNOLOGY LETTERS, v.17, no.6, pp.1226 - 1228 IEEE PHOTONICS TECHNOLOGY LETTERS 17 6 1226 1228 scie scopus 000229850300030 2-s2.0-20544446121 Engineering, Electrical & Electronic Optics Physics, Applied Engineering Optics Physics Article PERIOD FIBER GRATINGS band-rejection filter divided heater long-period fiber gratings (LPFGs) tunable