Optical fibre devices based on mode conversion in tilted SPFG and LPFG

J. L. Arce-Diego; D. Pereda-Cubian; F. Fanjul-Velez

doi:10.1117/12.608243

7 July 2005 Optical fibre devices based on mode conversion in tilted SPFG and LPFG

J. L. Arce-Diego, D. Pereda-Cubian, F. Fanjul-Velez

Proceedings Volume 5840, Photonic Materials, Devices, and Applications; (2005) https://doi.org/10.1117/12.608243
Event: Microtechnologies for the New Millennium 2005, 2005, Sevilla, Spain

Abstract

Tilted short-period fibre gratings (SPFG) couple the LP01 core mode to contra-directional core and cladding modes and can be used as optical fibre sensors and devices, mainly in reflection. Tilted long-period fibre gratings (LPFG) couple LP01 core mode to co-directional cladding and core modes and can be used as optical fibre sensors and devices in transmission. In this work we present the study and design of two optical devices based on both tilted SPFG and LPFG for mode conversion. The first proposed device is composed by a tilted LPFG and a tilted SPFG, both of them inscribed in the core of a few-modes fibre. Moreover it is used an optical circulator, which guides the light reflected in the second grating to the output. This optical fibre structure could be used in optical filtering and sensing due to the high sensitivity to the intrinsic or extrinsic perturbations of the spectral response in transmission and in reflection of the tilted LPFG and SPFG, respectively. By means of a proper structure it is possible to design an optical filter with two peaks due to different effects and to measure three different parameters. The another proposed device is composed by a LPFG and a 45-degrees tilted SPFG and based on a polarization mode conversion for filtering and sensing applications.

Citation Download Citation

J. L. Arce-Diego, D. Pereda-Cubian, and F. Fanjul-Velez "Optical fibre devices based on mode conversion in tilted SPFG and LPFG", Proc. SPIE 5840, Photonic Materials, Devices, and Applications, (7 July 2005); https://doi.org/10.1117/12.608243

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