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

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

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.

Joon Tae Ahn | Kyong Hon Kim

[1] M. Kobayashi. Noise figure improvement of optical gain clamped fibre amplifier by mid-point band reject filter for lasing light , 1999 .

[2] M. Zirngibl. Gain control in erbium-doped fibre amplifiers by an all-optical feedback loop , 1991 .

[3] K. Inoue. Gain-clamped fiber amplifier with a short length of preamplification fiber , 1999, IEEE Photonics Technology Letters.

[4] E. Desurvire,et al. Dynamic gain compensation in saturated erbium-doped fiber amplifiers , 1991, IEEE Photonics Technology Letters.

[5] M. Hashimoto,et al. A new method for low noise automatic gain control of EDFAs for WDM systems in metropolitan networks , 2001, Proceedings 27th European Conference on Optical Communication (Cat. No.01TH8551).

[6] H. Chung,et al. Reduction of relaxation oscillations in optical automatic gain clamped EDFA using fast electronic feedforward , 2002 .