Inscription of Polymer Optical Fiber Bragg Grating at 962 nm and Its Potential in Strain Sensing

• Published in: IEEE photonics technology letters Vol. 22; no. 21; pp. 1562 - 1564
• Main Authors: Zhang, Zhi Feng, Zhang, Chi, Tao, Xiao Ming, Wang, Guang Feng, Peng, Gang Ding
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.11.2010; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Diffraction gratings; Fiber Bragg grating (FBG); fiber grating fabrication; Fiber gratings; Gratings; measurement of strain; Optical fibers; polymer optical fiber (POF); Polymers; Strain
• ISSN: 1041-1135; 1941-0174
• DOI: 10.1109/LPT.2010.2069090

Fiber Bragg grating (FBG) with a 962-nm Bragg wavelength was fabricated in trans-4-stilbenemethanol doped poly(methyl methacrylate) polymer optical fibers (POFs) using a phase mask with 17% zeroth-order diffraction for the inscription wavelength of 325 nm. The effect of zeroth-order diffraction of the phase masks on FGB in POF was first examined by observing micrographs of the gratings. A linear relationship between the fiber axial strain and shift of the FBG was observed up to 6.5% tensile strain with a strain sensitivity of 0.916 pm/ . However, this shift was notably affected by the time-dependent stress relaxation in the fiber, especially when the FBG was subject to a relatively higher strain > 2%.