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Proceedings Paper

The novel fiber devices with laser machining technique
Author(s): Woojin Shin
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Paper Abstract

We propose the novel fiber devices with laser machining technique. one dimensional fiber end-surface grating was fabricated by inscribing micro-structure on the cleaved surface of a thermally expanded core fiber with femtosecond laser pulses. Diffraction beam patterns of the zeroth and the high order due to end-surface grating were observed. For the monitoring of signals in coarse wavelength division multiplexing wavelength, the measured diffraction beam patterns according to the wavelength of input light were investigated. Also, a structurally induced compact helicoidal long-period fiber grating (HLPFG) was fabricated by twisting a single mode fiber with CO2 laser beam and its characteristics were experimentally investigated. The eccentricity between the core and the cladding of a fiber is introduced from the screw-type deformation. This helically induced significant periodic index change along the fiber produces a deep mode coupling between the core and the cladding of -20 dB with a short grating length of ~1 cm. The novel peak shift of a HLPFG was analyzed with co-directional or contra-directional torsion to the helix.

Paper Details

Date Published: 21 November 2007
PDF: 9 pages
Proc. SPIE 6781, Passive Components and Fiber-based Devices IV, 67810I (21 November 2007);
Show Author Affiliations
Woojin Shin, Gwangju Institute of Science and Technology (South Korea)

Published in SPIE Proceedings Vol. 6781:
Passive Components and Fiber-based Devices IV
Ming-Jun Li; Jianping Chen; Satoki Kawanishi; Ian H. White, Editor(s)

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