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Optical Engineering

Comparison of the thermal tuning capability of different types of Bragg grating filters for wavelength division multiplexing applications
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Paper Abstract

We compare the thermal tuning capabilities of two type I gratings written in unloaded and in hydrogen-loaded germanium-doped silica fibers, and a type IIa grating written in unloaded fiber. The hydrogen-loaded grating is annealed after writing, to remove any unreacted hydrogen. We further study the gratings' response stability with temperature, an important property when these devices are used as optical filters in wavelength division multiplexing systems. Experimental results show that the worst option is the type I grating in unloaded fiber, which presents the highest bandwidth and group delay variations with temperature, so that it is the least suitable as a thermotunable optical filter in wavelength-multiplexed systems. For the other two options, the bandwidth and group delay variations are much smaller, the lowest values being obtained with the hydrogen-loaded type I grating, and the best thermal tuning efficiency with the type IIa grating.

Paper Details

Date Published: 1 September 2003
PDF: 4 pages
Opt. Eng. 42(9) doi: 10.1117/1.1593661
Published in: Optical Engineering Volume 42, Issue 9
Show Author Affiliations
Mario J. N. Lima, Univ. de Aveiro (Portugal)
Antonio Luis Jesus Teixeira, Univ. de Aveiro (Portugal)
Jose R. Ferreira da Rocha, Univ. de Aveiro (Portugal)
Orlando Frazao, Instituto de Engenharia de Sistemas e Computadores (Portugal)
Paulo S. B. Andre, Instituto de Telecomunicacoes de Aveiro (Portugal)

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