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Efficient and low‐noise gain‐flattened double‐pass L‐band erbium‐doped fiber amplifier
Author(s) -
Harun S. W.,
Ahmad H.
Publication year - 2003
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.11300
Subject(s) - noise figure , low noise amplifier , direct coupled amplifier , amplifier , optics , optoelectronics , materials science , fully differential amplifier , wavelength division multiplexing , optical amplifier , wavelength , electrical engineering , physics , differential amplifier , engineering , operational amplifier , cmos , laser
Abstract A new double‐pass long‐wavelength‐band erbium‐doped fiber amplifier with enhanced noise figure characteristics is demonstrated by adding a short length of forward pumped erbium‐doped fiber (EDF) in front of the double‐pass amplifier. By adding 7 m of EDF, the amplifier achieves a flat‐gain output at about 34.2 dB with a gain variation of less than 1.3 dB at the wavelength region 1568–1598 nm. The corresponding noise figures vary from 5.0 to 5.7 dB, which is improved by 1.7 to 7.5 dB over the flat‐gain region, as compared to that of the conventional double‐pass amplifier. This new amplifier with high gain and low noise figure can be useful as an inline amplifier in a wavelength division multiplexing transmission system. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 40: 112–114, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11300