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Proceedings Paper

Development of a high speed wideband frequency tunable infrared laser source for real time wind turbine array sensing applications
Author(s): Philip Mitchell; Adrian Janssen; Bahar Partov Poor
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Paper Abstract

This paper reports the development of an infra-red circa 193THz (~1.5μm) frequency tunable laser source selected and evaluated for photonic environment sensing systems. LIDAR (LIght Detection And Ranging) offers a method of remote wind speed measurement. Widespread deployment of the technique has been limited by the expense and complexity of LIDAR systems. However development of systems based on optical fiber and photonic components from the telecommunications industry promises improvements in cost, compactness, and reliability, so that it becomes viable to consider deployment of such systems on large wind turbines for the advance detection of fluctuations of wind speed. A monolithic multi-section laser, originally designed as a tunable source for telecommunications applications, has been modified and re-evaluated as a source for sensing applications, based on the technique of coherent laser radar (CLR), and coherent doppler LIDAR (CDL). A tunable frequency optical source should fulfil specific technical criteria to fulfil the applications requirements; speed of frequency selection, absolute accuracy of emitted frequency, spectral purity, and stability. Custom electronics and firmware were developed to realise an improvement in frequency switching speed by a factor of 10 relative to equivalent commercially available telecoms (DBR) sources, satisfying the target application requirements. An overview of the sensing architecture is presented, a detailed description of the fast tuning process described, including the custom hardware and firmware, and specifically the laser energising sequence. The results of the laser module are then presented with detailed consideration of the target application.

Paper Details

Date Published: 2 June 2011
PDF: 12 pages
Proc. SPIE 8069, Integrated Photonics: Materials, Devices, and Applications, 806907 (2 June 2011); doi: 10.1117/12.885620
Show Author Affiliations
Philip Mitchell, Oclaro, Inc. (United Kingdom)
Univ. of Bolton (United Kingdom)
Adrian Janssen, Oclaro, Inc. (United Kingdom)
Bahar Partov Poor, Oclaro, Inc. (United Kingdom)

Published in SPIE Proceedings Vol. 8069:
Integrated Photonics: Materials, Devices, and Applications
Ali Serpengüzel; Giancarlo Cesare Righini; Alfred Leipertz, Editor(s)

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