Thermal effects in doped fibers

A theoretical analysis of the pump-induced temperature change and associated thermal phase shift occurring in a pumped doped fiber is presented. Although the primary devices targeted are all-optical switches based on doped fibers, where such effects can be detrimental, this analysis is also applicab...

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Bibliographic Details
Published in:Journal of lightwave technology 1998-06, Vol.16 (6), p.1013-1023
Main Authors: Davis, M.K., Digonnet, M.J.F., Pantell, R.H.
Format: Article
Language:English
Subjects:
Applied sciences
Circuit properties
Doped fiber amplifiers
Electric, optical and optoelectronic circuits
Electronics
Exact sciences and technology
Fiber lasers
Integrated optics. Optical fibers and wave guides
Laser theory
Mach-Zehnder interferometers
Optical and optoelectronic circuits
Optical fiber devices
Pulse amplifiers
Pump lasers
Steady-state
Switches
Temperature
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Summary:A theoretical analysis of the pump-induced temperature change and associated thermal phase shift occurring in a pumped doped fiber is presented. Although the primary devices targeted are all-optical switches based on doped fibers, where such effects can be detrimental, this analysis is also applicable to lasers, amplifiers, and other doped fiber devices. The effects of a single pump pulse, multiple pulses and continuous wave (CW) pumping are investigated, both in the dynamic and steady-state regimes. Simple expressions are derived for the thermal relaxation time constant of a fiber, and for its steady-state temperature rise and thermal phase shift under CW pumping. This study predicts that in all-optical fiber switches utilizing a reasonably good dopant the thermal effect due to a single short pulse is negligible in all interferometers, while the steady-state effect can be sizable in a standard fiber Mach-Zehnder but is negligible in a twin-core fiber, a two-mode fiber, and a specially designed Mach-Zehnder interferometer.
ISSN:0733-8724
1558-2213
DOI:10.1109/50.681458