Abstract

Grating devices in polymer optical fiber (POFs) have attracted interest due to varies potential applications in recent years. This chapter presents the state of art about the fabrication technology of grating devices in different kinds of POFs and explores potential sensing application scenarios, focus on the fabrication of chirped POF FBG devices and the potential application of such devices. Present several typical applications with uniform POF FBG. Also present several typical applications based on Chirped POF FBG, which indicate POF FBG shown promising in the sensing area with show higher sensitivity and bio-compatibility than silica ones, and special grating in POF are attractive for future biomedical applications.

Highlights

  • Polymer Optical fiber (POF) is one kind of optical fiber made of polymer material

  • Grating devices in optical fibers normally belong to two main types, which depending on the mode-coupling mechanism, counter-directional coupling is the responsible mechanism in fiber Bragg gratings (FBGs) and co-directional coupling as main mechanism for long-period gratings (LPG)

  • POF FBG already goes to industry measurement such as used for water content detection in aviation fuel as shown in the Figure 7, the water content in Jet-A1 was measured by using POF FBG sensing technology which calibrated with both coulometric titration and environmental chamber

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Summary

Introduction

Polymer Optical fiber (POF) is one kind of optical fiber made of polymer material. It has attractive characteristics such as low Young’s modulus, high strain, high flexibility, and biocompatibility performance compared with silica optical fiber. The most common material for polymer optical fiber is still PMMA which is cheap with high transmission loss at the telecom band Both GI-POF and step-index POF mentioned above are multimode fibers, until now the main commercial POFs with single-mode performance with low fabrication cost still under research. The first FBG in POF was reported by Peng’s group with a stepindex polymer optical fiber before twenty years [19], one main challenge for grating device fabrication in POF is the multimode performance of fiber, make it is difficult to analyses the spectrum from different modes. Dobb et al [22] reported the first FBG in endless single-mode mPOF in 2005, open the research of grating devices fabrication research with POF Different materials such as Zeonex [23, 24], TOPAS [25, 26], and polycarbonate [27, 28] were used to fabricate microstructured polymer optical fiber (mPOF), different kind of laser irradiation technology were investigated for POG.

The basic theory of POF grating devices
Fabrication of POF grating devices
Applications of POF grating devices
Findings
Conclusion and outlook
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