Inscription of narrow bandwidth Bragg gratings in polymer optical fibers

Abstract

We report on the production and characterization of narrow bandwidth fiber Bragg gratings (FBGs) in two spectral regions using polymer optical fibers (POFs). Narrow bandwidth FBGs are increasingly important for POF transmission systems, WDM technology and sensing applications. Long FBGs with resonance wavelength around 850 nm and 1550 nm were fabricated in several types of polymer optical fibers. The 3 dB FBG bandwidth varies from 0.22 nm down to 0.045 nm considering a Bragg grating length of 10 mm and 25 mm, respectively.

Fabrication of Polymer Optical Fibre (POF) Gratings

“…In 2011, narrow bandwidths of 0.29 nm and 0.17 nm were achieved in FM mPOF and SI POF FBGs at 850 nm with 10 mm-long grating and 10 dB rejection, respectively [91]. In 2013, using a scanning technique with a short optical path, 3 dB bandwidth varied from 0.22 nm down to 0.045 nm has been achieved in long FBGs with resonance wavelengths at around 600, 850 and 1550 nm and 21 dB rejection [117,118,119]. With the development of fabrication techniques of POF gratings [44,46,52,54,64,65,68,77,81,85,91,102,103,104,105,112,117,118,119,120,121,125,128,133,143], the bandwidth has overall decreased from 1.0 nm to 0.045 nm.…”