Mode transition in uncoated long period gratings

Flavio Esposito; Anubhav Srivastava; Lucia Sansone; Michele Giordano; Stefania Campopiano; Agostino Iadicicco

doi:10.1117/12.2539995

28 August 2019 Mode transition in uncoated long period gratings

Flavio Esposito, Anubhav Srivastava, Lucia Sansone, Michele Giordano, Stefania Campopiano, Agostino Iadicicco

Proceedings Volume 11199, Seventh European Workshop on Optical Fibre Sensors; 111992W (2019) https://doi.org/10.1117/12.2539995
Event: Seventh European Workshop on Optical Fibre Sensors, 2019, Limassol, Cyprus

Abstract

Here we report about mode transition phenomenon occurring in uncoated Long Period Grating (LPG) and the subsequent possibility of enhancing the surrounding refractive index sensitivity. For this purpose, we have considered a grating realized in double cladding fiber with W-type refractive index profile. This fiber presents an outer cladding with refractive index higher than inner cladding one; thus, through the chemical etching of the outer diameter, the transition phenomenon from outer- to inner-cladding of some cladding modes can be induced in controllable manner. The effect is illustrated by numerical analysis and it is experimentally verified using an LPG written in pure-silica core with F-doped inner cladding and silica outer cladding fiber, by means of the electric arc discharge technique.

Citation Download Citation

Flavio Esposito, Anubhav Srivastava, Lucia Sansone, Michele Giordano, Stefania Campopiano, and Agostino Iadicicco "Mode transition in uncoated long period gratings", Proc. SPIE 11199, Seventh European Workshop on Optical Fibre Sensors, 111992W (28 August 2019); https://doi.org/10.1117/12.2539995

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