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Proceedings Paper

Phase sensitivity of hollow-core photonic bandgap fiber to acoustic pressure
Author(s): M. Pang; W. Jin
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Paper Abstract

Detection of acoustic pressure with optical fiber interferometers has been studied for many years1-3. The conventional solid silica fiber hydrophone was sufficient to prove the concept; however, it has low acoustic sensitivity. This is because 1) the silica glass material has relatively high Young's modulus, which makes the conventional fiber incompressible; 2) the refractive index change resulted from fiber strain has opposite sign with respective to the strain term and hence compromises the acoustic sensitivity. In a hollow-core photonic bandgap fiber (PBF), the fundamental mode is almost entirely confined to the air core, the effective Young's modulus of fiber is expected to be reduced and the undesirable "negative" index effect is anticipated to be greatly decreased. We experimentally measured that the phase sensitivity of the commercial HC-1550-02 PBF and found it is improved by a factor of 15dB compared to a conventional (HNSM-155) single mode fiber, which agrees well with theoretical prediction.

Paper Details

Date Published: 5 October 2009
PDF: 4 pages
Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75035Z (5 October 2009); doi: 10.1117/12.835012
Show Author Affiliations
M. Pang, Hong Kong Polytechnic Univ. (Hong Kong, China)
W. Jin, Hong Kong Polytechnic Univ. (Hong Kong, China)

Published in SPIE Proceedings Vol. 7503:
20th International Conference on Optical Fibre Sensors
Julian D. C. Jones, Editor(s)

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