Abstract
A novel temperature insensitive all-fiber compact polarization-maintaining
photonic crystal fiber (PMPCF) based interferometer was presented. The coupling between
the PMPCF and single mode fiber (SMF) was investigated experimentally and analytically.
With an all-fiber compact SMF-PMPCF-SMF structure, the cladding modes propagating in the
PMPCF can be effectively excited by finely core-offsetting one splice between the PMPCF
and SMF. With the increase of the core-offset, the interference depth of the
interference pattern enlarges accordingly. Under a suitable core-offset, the PMPCF based
interferometer with high interference depth can be obtained. Moreover, it is temperature
insensitive due to its ultra-low thermal characteristics. We also demonstrated its
applications in strain and refractive index measurement. The sensors have the advantages
of small size, simple and compact all fiber structure, high sensitivity, and temperature
insensitiveness.
© 2010 IEEE
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