Abstract
A few-mode polymer optical fiber (POF) with a highly photosensitive
core doped with benzil dimethyl ketal (BDK) was fabricated and used to write
a Bragg grating using the modified Sagnac optical interference technique.
Bragg gratings formed in the few-mode POF show multiple reflection peaks.
The response characteristics of the temperature and the strain of the few-mode
POF Bragg grating (POFBG) were theoretically analyzed and experimentally verified.
The results show almost the same strain response but a different temperature
response for all guided modes in the few-mode POFBG. A new method of measuring
temperature and strain simultaneously was proposed and demonstrated experimentally
by using a single few-mode POFBG.
© 2013 IEEE
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