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Linewidth characteristics of a filterless tunable erbium doped fiber ring laser

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Title Linewidth characteristics of a filterless tunable erbium doped fiber ring laser
 
Creator DEEPA, V
VIJAYA, R
 
Subject l-band
wavelength tunability
analytical model
c-band
optimization
amplifiers
length
power
 
Description The linewidth characteristics of a continuous wave erbium doped fiber ring laser whose tunability is controlled by intracavity loss are studied in this work. The spectral linewidth of such a filterless laser is measured experimentally, and its characteristics are analyzed using the existing analytical model of fiber laser. The long length of the cavity results in lasing into multiple longitudinal modes, thus leading to a broad linewidth. The extent of this broadening is found to depend on the intracavity attenuation and pump powers. Under the given experimental conditions, for a fiber of length 12 m, the linewidth increases up to 4.5 nm corresponding to an additional cavity loss of 5 dB, while it increases up to 8 nm for a loss of 1.2 dB for a fiber of length 4.6 m. The linewidth decreases with further increase in intracavity loss for both cases. In this work, the linewidth dependence on the intracavity loss is directly linked to the spectral dependence of the threshold power for each length. The linewidth increases with pump power irrespective of the intracavity attenuation, and this is explained through the nature of the amplified spontaneous emission from the fiber at different pump powers. The experimental results and the subsequent analysis are useful for the design of a filterless tunable laser with a narrow linewidth using erbium doped fiber in the ring configuration. (C) 2007
 
Publisher AMER INST PHYSICS
 
Date 2011-07-16T09:05:55Z
2011-12-26T12:49:41Z
2011-12-27T05:35:16Z
2011-07-16T09:05:55Z
2011-12-26T12:49:41Z
2011-12-27T05:35:16Z
2007
 
Type Article
 
Identifier JOURNAL OF APPLIED PHYSICS, 102(8), -
0021-8979
http://dx.doi.org/10.1063/1.2798579
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4383
http://hdl.handle.net/10054/4383
 
Language en