21 November 2007 The novel fiber devices with laser machining technique
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Proceedings Volume 6781, Passive Components and Fiber-based Devices IV; 67810I (2007) https://doi.org/10.1117/12.743678
Event: Asia-Pacific Optical Communications, 2007, Wuhan, China
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.
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Woojin Shin, Woojin Shin, "The novel fiber devices with laser machining technique", Proc. SPIE 6781, Passive Components and Fiber-based Devices IV, 67810I (21 November 2007); doi: 10.1117/12.743678; https://doi.org/10.1117/12.743678
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