Gain clamping in single-pass and double-pass L-band erbium-doped fiber amplifiers

Harun, Sulaiman Wadi and Ahmad, Harith (2004) Gain clamping in single-pass and double-pass L-band erbium-doped fiber amplifiers. Acta Physica Slovaca, 54 (1). pp. 81-88. ISSN 1336-040X,

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Gain clamping is demonstrated in single-pass and double-pass long wavelength band erbium-doped fiber amplifiers (L-band EDFAs). A C/L-band wavelength division multiplexing (WDM) coupler is used in single-pass system to generate a laser at 1566 nm. The gain for the amplifier is clamped at 15.5 dB with gain variation of less than 0.2 dB from input signal power of -40 to -14 dBm with almost negligible noise figure penalty. However, the flatness of gain spectrum is slightly degraded due to the un-optimisation of erbium-doped fiber (EDF) length. The advantage of this configuration is that the oscillating light does not appear at the output port of the amplifier. A highly efficient gain-clamped L-band EDFA with improved noise figure characteristic is demonstrated by simply adding a broadband conventional band fiber Bragg grating (C-band FBG) in double pass system. The combination of the FBG and optical circulator has created laser in the cavity for gain clamping. By adjusting the power combination of pumps 1 and 2, the clamped gain level can be controlled. The amplifier gain is clamped at 28.1 dB from -40 to -25 dBm with gain variation of less than 0.5 dB by setting the pumps 1 and 2 at 59.5 and 50.6 mW, respectively. The gain is also flat from 1574 nm to 1604 nm with gain variation of less than 3 dB. The corresponding noise figure varies from 5.6 to 7.6 dB, which is 0.8 to 2.6 dB reduced compared to those of unclamped amplifier.

Item Type: Article
Uncontrolled Keywords: Gain clamping; Single-pass; Double-pass; L-band erbium-doped fiber amplifiers
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 08:26
Last Modified: 11 Oct 2018 08:26

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