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All-optical gain-clamped erbium-doped fiber amplifier with improved noise figure and freedom from relaxation oscillation

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2 Author(s)
Joon Tae Ahn ; Basic Res. Lab., ETRI, Daejeon, South Korea ; Kyong Hon Kim

All-optical gain clamping scheme of erbium-doped fiber amplifier (EDFA) based on partial reflection of amplified spontaneous emission (ASE) into the EDFA is proposed and successfully demonstrated by using a coarse wavelength division multiplexing coupler with a mirror as an ASE reflector. The proposed gain-clamped EDFA (GC-EDFA) has good gain clamping characteristics up to -12 dBm of input signal power with 1-dB gain reduction from a clamped gain of 21 dB. Thanks to noncavity structure of the proposed GC-EDFA the amplifier is free from relaxation oscillation and has 1-dB improved noise figure, compared to a previous GC-EDFA based on a ring-type optical cavity.

Published in:

Photonics Technology Letters, IEEE  (Volume:16 ,  Issue: 1 )