Gain control in double-pass L-band EDFA using a ring resonator and two-stage configuration

Harun, Sulaiman Wadi and Md Samsuri, N. and Poopalan, Prabakaran and Ahmad, Harith (2004) Gain control in double-pass L-band EDFA using a ring resonator and two-stage configuration. Optik, 115 (11-12). pp. 525-527. ISSN 0030-4026, DOI

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A gain-clamped double-pass long wavelength band erbium-doped fiber amplifier with high clamped-gain and low noise figure is demonstrated using a ring laser. The optical circulator is used at output end of the amplifier to retro-pass the test signal back into the system for enhanced gain. A length of forward pumped erbium-doped fiber is incorporated in front of the double-pass amplifier to achieve a low noise figure. The gain clamping is achieved by routing the backward amplified spontaneous emission into the feedback loop via optical circulator and C/L-band wavelength selective coupler to create a ring laser, which operates outside the L-band region. The gain is clamped at 10.6 dB for all input signal powers from -40 dBm to -4 dBm with a gain variation of less than ±0.4 dB, when the variable optical attenuator (VOA) is set at 0 dB. The clamped-gain level can be tuned from 10.6 to 21.6 dB by varying the VOA settings from 0 to 12 dB. The corresponding noise figure varies from 9.1 to 5.2 dB.

Item Type: Article
Uncontrolled Keywords: Gain clamping; Optical amplifier; L-band EDFA; Double-pass; Ring laser
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 08:19
Last Modified: 11 Oct 2018 08:19

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