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Fibers 2017, 5(3), 29; doi:10.3390/fib5030029

Manufacturing and Spectral Features of Different Types of Long Period Fiber Gratings: Phase-Shifted, Turn-Around Point, Internally Tilted, and Pseudo-Random

Institute of Applied Physics “Nello Carrara”, National Research Council of Italy (IFAC-CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino (FI), Italy
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Author to whom correspondence should be addressed.
Academic Editors: Stephen C. Bondy, Giancarlo C. Righini, Shibin Jiang and Francesco Prudenzano
Received: 5 July 2017 / Revised: 5 July 2017 / Accepted: 1 August 2017 / Published: 8 August 2017
(This article belongs to the Special Issue Advances in Optical Fibers II)
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Abstract

The manufacturing and spectral features of different types of long period fiber gratings (LPFGs), ranging from phase-shifted, turn-around point, and internally tilted gratings, to pseudo-random gratings, are described and discussed in detail. LPFGs were manufactured on boron-germanium co-doped photosensitive optical fibers with the point-by-point technique using an excimer KrF laser operating at 248 nm. The developed experimental setup to manufacture high-quality LPFGs was designed to totally customize any type of gratings with the possibility of setting different parameters, such as the grating period (or pitch), the number of grating planes, the number of laser shots for each plane, etc. Some important spectral features of the LPFGs’ spectra were taken into account. This allows realizing homemade devices useful in several fiber-based applications, such as optical filtering, coupling systems, random lasers, physical and chemical sensing, and biosensing. View Full-Text
Keywords: long period fiber grating; manufacturing characteristics; tilted grating; random grating long period fiber grating; manufacturing characteristics; tilted grating; random grating
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Chiavaioli, F.; Baldini, F.; Trono, C. Manufacturing and Spectral Features of Different Types of Long Period Fiber Gratings: Phase-Shifted, Turn-Around Point, Internally Tilted, and Pseudo-Random. Fibers 2017, 5, 29.

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