Gain Clamping in Two-Stage L-Band EDFA Using a Broadband FBG

Harun, Sulaiman Wadi and Tamchek, Nizam and Poopalan, Prabakaran and Ahmad, Harith (2004) Gain Clamping in Two-Stage L-Band EDFA Using a Broadband FBG. IEEE Photonics Technology Letters, 16 (2). pp. 422-424. ISSN 1041-1135, DOI

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A gain-clamped long wavelength band erbium-doped fiber amplifier (L-band EDFA) with an improved gain characteristic is demonstrated by simply adding a broadband conventional band (C-band) fiber Bragg grating (FBG) in a two-stage amplifier system. The FBG reflects backward C-band amplified spontaneous emission (ASE) from the second stage back into the system to clamp the gain. The gain is clamped at about 22.4 dB with a gain variation below 0.4 dB for input signal powers of -40 to -15 dBm. Compared with an unclamped amplifier of similar noise figure values, the small signal gain has improved by 2.4 dB due to the FBG which blocks the backward propagating ASE. At wavelengths from 1570 to 1600 nm, gain of the clamped amplifier varies from 19.4 to 26.7 dB. The corresponding noise figure varies by ±0.35 dB around 5 dB, which is not much different compared to that of the undamped amplifier.

Item Type: Article
Uncontrolled Keywords: Fiber Bragg grating (FBG); Gain clamping; L-band EDFA; Optical amplifier; Two-stage EDFA
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering
Faculty of Science > Department of Physics
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 11 Oct 2018 08:31
Last Modified: 11 Oct 2018 08:31

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