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2-layer and 3-layer fiber geometry model based analysis of refractive index sensitivity of long period fiber grating with reduced cladding

S. PRASHAR1,2,* , S. SINGH1, D. ENGLES2, S. KAUSHIK3

Affiliation

  1. Chitkara University School of Engineering and Technology, Chitkara University, Himachal Pradesh, 174103, India
  2. Department of Electronics Technology, Guru Nanak Dev University, Amritsar, Punjab, 143005, India
  3. Central Scientific Instruments Organization, Sector-30C, Chandigarh, 160030, India

Abstract

This study investigates the refractive index (RI) sensitivity of long period fiber grating (LPFG) by means of 2-layer (2L) and 3-layer (3L) geometry models of optical fiber separately, through mathematical modelling. In order to realize the impact of particularly adopted model on measurement of RI sensitivity, the LPFG response is studied at reduced cladding radius. The reduction in cladding thickness increases the effect of ambient refractive index (ARI) on modal field distribution and improves sensitivity. However reducing cladding radius (up to 40.5µm) decreases the cladding mode content of fiber. Such consequences affect the possible highest ordered cladding mode, so the highest order HE14 cladding has been chosen here for analysis. The RI sensitivity is evaluated in terms of coupled mode theory based transmission spectrum shift with respect to cladding radius. The obtained results of both fiber geometry models are compared with reported work to decide their authenticity..

Keywords

Long period fiber grating, Fiber geometry model, Refractive index sensitivity.

Submitted at: Sept. 14, 2018
Accepted at: June 14, 2019

Citation

S. PRASHAR, S. SINGH, D. ENGLES, S. KAUSHIK, 2-layer and 3-layer fiber geometry model based analysis of refractive index sensitivity of long period fiber grating with reduced cladding, Journal of Optoelectronics and Advanced Materials Vol. 21, Iss. 5-6, pp. 295-301 (2019)