Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/32878
Title: Co2-laser-induced long-period gratings in graded-index multimode fibers for sensor applications
Authors: Su, L
Chiang, KS
Lu, C 
Issue Date: 2006
Publisher: Institute of Electrical and Electronics Engineers
Source: IEEE photonics technology letters, 2006, v. 18, no. 1, p. 190-192 How to cite?
Journal: IEEE photonics technology letters 
Abstract: Long-period grating (LPG) fabricated in a graded-index multimode fiber (MMF) by deforming the geometry of the fiber periodically with a focused CO2-laser beam is reported. The effects of the grating parameters on the transmission of the grating are investigated. We show that the transmission characteristics of the grating are similar to those of an MMF subject to periodic microbending. Strong mode couplings take place in the grating when the pitch of the grating is equal to a specific value (~1 mm), known as the critical spatial period of the fiber. The responses of some fabricated gratings to the axial strain and the change in the surrounding refractive index are measured and good sensitivities are achieved. Such MMF LPGs can be used potentially as physical and chemical sensors.
URI: http://hdl.handle.net/10397/32878
ISSN: 1041-1135
EISSN: 1941-0174
DOI: 10.1109/LPT.2005.861267
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