Wavelength Shift of Cladding Mode Resonances in a Mechanically Induced LPFG by Twisting the Fiber

Autor:	B. Unnikrishnan Nair, V.P. Mahadevan Pillai, V. P. Sudeep Kumar, V.U. Nayar
Rok vydání:	2007
Předmět:	Birefringence Materials science business.industry Physics::Optics Polarization-maintaining optical fiber Grating Long-period fiber grating Cladding mode Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Wavelength Optics Dispersion-shifted fiber Fiber business
Zdroj:	Fiber and Integrated Optics. 26:159-172
ISSN:	1096-4681 0146-8030
DOI:	10.1080/01468030701239501
Popis:	The long-period fiber grating is mechanically induced over a twisted fiber and its characteristics are investigated. The amplitude as well as the wavelength shift of the resonance is studied in response to the applied twist and pressures. These resonances decrease in amplitude and shift to shorter wavelength side as the applied twist increases. The spectral responses of a grating assembly formed by two grating sections in series, one section with a twisted fiber and other with an untwisted fiber, are also investigated. Shearing stress and photo-elasticity causes the fiber to be circularly birefringent and the mechanically induced grating formed over the twisted fiber region causes the appearance of two resonances shifted away from the resonances of the untwisted grating section. At higher twist rates, resonant wavelength shift becomes insensitive to applied pressures, showing a reduction in the induced linear birefringence. The wavelength shift is almost symmetric with respect to the applied twis...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::8bc578c668bf0e04ac19631bbad7e248 https://doi.org/10.1080/01468030701239501 Zobrazit plný text záznamu