Dynamic EDFA gain-flattening filter using two LPFGs with divided coil heaters

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 distributio...

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Bibliographic Details
Published in:IEEE photonics technology letters 2005-06, Vol.17 (6), p.1226-1228
Main Authors: Jun Kye Bae, Jun Kye Bae, Jinho Bae, Jinho Bae, Sang Hyuck Kim, Sang Hyuck Kim, Namkyoo Park, Namkyoo Park, Sang Bae Lee, Sang Bae Lee
Format: Article
Language:English
Subjects:
Amplifiers
Band-rejection filter
Coiling
Coils
Concatenated codes
divided heater
Dynamics
Erbium-doped fiber amplifier
Fiber gratings
Fibers
Heaters
Heating equipment
long-period fiber gratings (LPFGs)
Optical fiber polarization
Optical filters
Optical modulation
Power control
Ripples
Temperature control
Temperature distribution
tunable
Vehicle dynamics
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Summary: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.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2005.847439