Double-pass configuration to enhance the sensitivity of a polyelectrolyte-coated arc-induced long-period fiber grating

Abstract

In this paper, we introduce a simple and effective method to improve the transmission power respond of a polyelectrolyte (PE)-coated arc-induced long-period fiber grating (LPFG) sensor toward external perturbation. Experiments using single-pass and double-pass configurations were conducted to measure sucrose concentrations of between 0 and 80 wt%. The results showed that the transmission power sensitivity of the PE-coated LPFG sensor in the double-pass configuration was almost double compared to the single-pass configuration.

Keywords:

• long-period fiber grating
• double-pass configuration
• polyelectrolyte coating
• optical fiber sensor

Additional information

Funding

The project is sponsored under the Fundamental Research Grant Scheme (FRGS), Ministry of Higher Education, Malaysia (FRGS/2/2101/ SG/UTAR/01/1).