Title :
Dynamic EDFA gain-flattening filter using two LPFGs with divided coil heaters
Author :
Bae, Jun Kye ; Bae, Jinho ; Kim, Sang Hyuck ; Park, Namkyoo ; Lee, Sang Bae
Author_Institution :
Photonics Res. Center, Korea Inst. of Sci. & Technol., Seoul, South Korea
fDate :
6/1/2005 12:00:00 AM
Abstract :
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.
Keywords :
diffraction gratings; erbium; optical communication equipment; optical fibre amplifiers; optical fibre cladding; optical fibre filters; optical tuning; optical variables control; power control; temperature distribution; cladding modes; divided coil heaters; dynamic EDFA; filter spectrum controllability; filter tuning flexibility; gain-flattening filter; long-period fiber gratings; optimum gain flatness; power control; signal ripples; temperature distribution adjustment; wide dynamic-range gain; Coils; Concatenated codes; Erbium-doped fiber amplifier; Fiber gratings; Optical fiber polarization; Optical filters; Optical modulation; Temperature control; Temperature distribution; Vehicle dynamics; Band-rejection filter; divided heater; long-period fiber gratings (LPFGs); tunable;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2005.847439
