Gain clamping in double-pass L-band EDFA using a ring resonator

A gain‐clamped long‐wavelength‐band erbium‐doped fiber amplifier (L‐band EDFA) based on a ring‐laser cavity is demonstrated using two C/L‐band wavelength‐selective couplers. This new design provides improved gain characteristics and high tuneability. The gain is clamped at 11.5 dB with a gain variat...

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Bibliographic Details
Published in:Microwave and optical technology letters 2004-12, Vol.43 (6), p.484-486
Main Authors: Harun, S. W., Samsuri, N. MD, Ahmad, H.
Format: Article
Language:English
Subjects:
C/L-band WSC
gain clamping
L-band EDFA
optical amplifier
ring resonator
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Summary:A gain‐clamped long‐wavelength‐band erbium‐doped fiber amplifier (L‐band EDFA) based on a ring‐laser cavity is demonstrated using two C/L‐band wavelength‐selective couplers. This new design provides improved gain characteristics and high tuneability. The gain is clamped at 11.5 dB with a gain variation of less than 0.1 dB from an input‐signal power of −40 to −6 dBm by setting the variable attenuation setting (VOA) at 8 dB. Also, the clamped‐gain level can be controlled to be in the range from 4.7 to 21.3 dB by varying the VOA settings from 0 to 24 dB. However, the proposed gain‐clamped amplifier suffers from noise‐figure degradation, as compared to the open‐ring amplifier, due to the intense ring‐laser light, which counter‐propagates through the EDF. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 43: 484–486, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20509
ISSN:0895-2477
1098-2760
DOI:10.1002/mop.20509