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Proceedings Paper

Photosensitive glass integrated optical devices
Author(s): B. J. Ainslie; Graeme D. Maxwell; Doug L. Williams
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Paper Abstract

Photosensitive glasses for applications in integrated optical devices have recently become a popular research topic, due primarily to the success of the germania doped silica fibre counterpart. Whole ranges of devices could in principle be fabricated utilising the photosensitivity phenomenon, from directly written waveguides to more complex grating structures. A key parameter in all applications is the change in material refractive index after light exposure. Considerable effort has been devoted to understanding mechanisms responsible for the phenonema with attempts to maximise the effect. To date index changes achieved are ~ 10-3 which is sufficient for the production of highly efficient holographic gratings within a waveguide, but not quite large enough for direct waveguide formation. Various writing schemes have been developed, but most are based on UV laser sources operating in the 240 - 270nm wavelength range to coincide with a germanium related defect absorption. High quality gratings, with reflection efficiencies of 14dB have been written. These gratings have been used as feed back elements in external cavity lasers and when incorporated in a Mach-Zender interferometer, a channel dropping filter has been demonstrated. With continued effort, more compact optical devices utilising gratings and the photosensitivity effect can be expected in parallel with the fibre development work.

Paper Details

Date Published: 25 July 1994
PDF: 15 pages
Proc. SPIE 10275, Glass Integrated Optics and Optical Fiber Devices: A Critical Review, 102750F (25 July 1994); doi: 10.1117/12.179756
Show Author Affiliations
B. J. Ainslie, BT Labs. (United Kingdom)
Graeme D. Maxwell, BT Labs. (United Kingdom)
Doug L. Williams, BT Labs. (United Kingdom)

Published in SPIE Proceedings Vol. 10275:
Glass Integrated Optics and Optical Fiber Devices: A Critical Review
S. Iraj Najafi, Editor(s)

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