Periodical rocking long period gratings in PANDA fibers for high temperature and refractive index sensing

Wa Jin; Wei-hong Bi; Xing-hu Fu; Guang-wei Fu

doi:10.1007/s11801-017-7075-9

Optoelectronics Letters ›› 2017, Vol. 13 ›› Issue (5) :354 -357. DOI: 10.1007/s11801-017-7075-9

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Periodical rocking long period gratings in PANDA fibers for high temperature and refractive index sensing

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Abstract

We report periodical rocking long period gratings (PR-LPGs) in PANDA fibers fabricated with CO₂ laser. The PR-LPGs achieve very high coupling efficiency of 19 dB with 12 periods and a 3.5° twist angle in just one scanning cycle, which is much more effective than the conventional CO₂ laser fabrication technique. This type of LPGs exhibits polarization-selective resonance dips which demonstrate different sensitivities to environmental parameters. The high temperature and external refractive index sensitivities are measured simultaneously, so it can be used as a wavelength-selective polarization filter and sensor.

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Wa Jin, Wei-hong Bi, Xing-hu Fu, Guang-wei Fu. Periodical rocking long period gratings in PANDA fibers for high temperature and refractive index sensing. Optoelectronics Letters, 2017, 13(5): 354-357 DOI:10.1007/s11801-017-7075-9

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