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Gain improvement in L‐band EDFA using unpumped EDF in a double pass system
Author(s) -
Harun S. W.,
Tamchek N.,
Poopalan P.,
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.10706
Subject(s) - optical amplifier , noise figure , wavelength division multiplexing , signal (programming language) , automatic gain control , wavelength , microwave , noise (video) , amplifier , power (physics) , physics , optics , electronic engineering , engineering , telecommunications , computer science , laser , bandwidth (computing) , quantum mechanics , artificial intelligence , image (mathematics) , programming language
A new gain improvement technique for L‐band EDFA is presented. It uses an unpumped EDF in a double‐pass configuration in order to effectively suppress and completely exploit the backward ASE. Compared to a conventional single‐pass amplifier, the gain coefficient can be improved from 1.5 dB/mW to 3.1 dB/mW without much noise figure penalty. The L‐band EDFA can also reduce the pump power necessary to achieve a specified gain by about half, however, this occurs at the cost of noise figure increasing by 1.6 dB. The optimum length for an unpumped EDF is experimentally measured to be 3 m for both single‐pass and double‐pass systems. The maximum gain improvement of 15.5 dB was observed at a signal wavelength of 1572 nm while signal and pump powers were fixed at −30 dBm and 103 mW, respectively. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 36: 154–156, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10706