Temperature characteristics of coated long period fiber gratings

Abstract

Abstract:

A method is proposed to directly inscribe long period fiber gratings(LPFGs) in coated standard communication optical fibers by an 800nm infrared femtosecond laser. Influence of fiber coatings on the effective indices for fundamental core mode and cladding mode was analyzed theoretically, and further research was carried out to study the influence on the LPFG’s temperature sensitivity. Temperature performance of the low-order cladding mode of uncoated and coated LPFGs was tested, respectively. The results show that the presence of coating is not only the desirable protective layer for LPFGs, and most importantly, the LPFG’s temperature sensitivity is increased to 0.1173 , in accordance with the theory analysis. The coated LPFGs, if as temperature sensors, will have a good mechanical strength and temperature sensitivity.

Key words: fiber and waveguide optics, coated long period fiber gratings, femtosecond laser pulses, temperature characteristics

CLC Number:

TN253

LU Jun-hui, SHI Jie-long. Temperature characteristics of coated long period fiber gratings[J]. J4, 2012, 29(2): 247-251.

References

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