Twist Sensitivity of Cladding-Mode Resonances and Its Cross-Sensitivity to Strain and Temperature in a Mechanically Induced Long-Period Fiber Grating

Autor:	V. P. Sudeep Kumar, Anitha S. Nair, Hubert Joe
Rok vydání:	2014
Předmět:	Mode volume Birefringence Materials science business.industry Resonance Polarization-maintaining optical fiber Long-period fiber grating Cladding mode Graded-index fiber Molecular physics Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Optics Fiber business
Zdroj:	Fiber and Integrated Optics. 33:347-359
ISSN:	1096-4681 0146-8030
DOI:	10.1080/01468030.2014.979958
Popis:	Twist sensitivity of cladding-mode resonances in a mechanically induced long-period fiber grating formed over a single-mode fiber is experimentally demonstrated and theoretically analyzed. Of the two usual cladding-mode resonances corresponding to LP11 and LP12, higher-order mode LP12 is more sensitive to twist in comparison with the lower-order mode LP11. The extent of down-shifting of resonant wavelengths depends on twist-induced circular birefringence and the modal field distribution of the cladding-modes inside the fiber. When the fiber is severely twisted to 3.5 rad/cm, a shift sensitivity is observed of 1 nm/(rad/cm) for the LP11 mode and 4.23 nm/(rad/cm) for the LP12 mode. The fiber breaks when the twist rate exceeds 3.5 rad/cm. In comparison with LP12, the LP11 resonance is almost independent of the axial strain variation with an ultra-low sensitivity of 0.18 pm/μe, and it is also almost insensitive to the temperature variation with a coefficient of 35 pm/°C. Forming the LP11 resonance far...
Databáze:	OpenAIRE
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