Gain-clamping techniques in two-stage double-pass L-band EDFA

Harun, S. W. and Samsuri, N. Md. and Ahmad, H. (2006) Gain-clamping techniques in two-stage double-pass L-band EDFA. Pramana, 66 (3). pp. 539-545. ISSN 0304-4289

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Official URL: http://dx.doi.org/10.1007/BF02704497

Abstract

Two designs of long-wavelength band erbium-doped fiber amplifier (L-band EDFA) for gain clamping in double-pass systems are demonstrated and compared. The first design is based on ring laser technique where a backward amplified spontaneous emission (ASE) from the second stage is routed into the feedback loop to create an oscillating laser for gain clamping. The gain is clamped at 18.6 dB from -40 to -8 dBm with a gain variation of less than 0.1 dB and a noise figure of less than 6 dB. Another scheme is based on partial reflection of ASE into the EDFA, which is demonstrated using a narrowband fiber Bragg grating. This scheme achieves a good gain clamping characteristic up to -12 dBm of input signal power with a gain variation of less than 0.3 dB from a clamped gain of 22 dB. The noise figure of a 1580 nm signal is maintained below 5 dB in this amplifier since this scheme is not based on lasing mechanism. The latter scheme is also expected to be free from the relaxation oscillation problem.

Item Type: Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Engineering (FOE)
Depositing User: Ms Rosnani Abd Wahab
Date Deposited: 23 Sep 2011 02:44
Last Modified: 23 Sep 2011 02:44
URI: http://shdl.mmu.edu.my/id/eprint/2001

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