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Band selection in an amplified spontaneous emission source using the backward‐feedback technique
Author(s) -
Sinivasagam V.,
Dimyati K.,
Singh R. D.,
Abushagur M. A. G.
Publication year - 2005
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.20949
Subject(s) - dbm , amplified spontaneous emission , bandwidth (computing) , microwave , materials science , l band , doping , power (physics) , optoelectronics , optics , physics , telecommunications , cmos , engineering , amplifier , laser , quantum mechanics
In this paper, the band‐selective behavior in an amplified spontaneous emission (ASE) source of an erbium‐doped silica fiber (EDF) is demonstrated. C‐band operation is obtained without backward ASE feedback, whereas L‐band operation is obtained with backward ASE feedback. The conversion from C‐band to L‐band results in a total spectral power improvement of 0.3 dB, while the 980‐nm pump power is fixed at 44.5 mW. The average power‐density improvement for the L‐band region (1565–1605 nm) was 18.9 dB with a maximum of 33.8 dB at 1565.0 nm, compared to the feedback and nonfeedback systems. The maximum power‐density results for the feedback and nonfeedback systems are −10.4 and −4.0 dBm at 1559.4 and 1563.4 nm, respectively. A bandwidth of 85.6 nm (1515.4–1601.0 nm) and 67.3 nm (1545.2–1612.5 nm) was obtained for the feedback and nonfeedback systems, respectively, at a power density of −30 dBm/nm. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 46: 218–220, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20949