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Proceedings Paper

High-silica cascaded three-waveguide couplers for wideband filtering by flame hydrolysis on Si
Author(s): Giovanni Barbarossa; Peter J. R. Laybourn
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Paper Abstract

Simply by the proper choice of the interaction length and number of cascaded three-waveguide directional couplers (3WC), appropriately connected, it is possible to design suitable spectral responses for filtering operations, tuning the passbands and achieving high stopband rejection. We report on the realization of low-loss, cascaded 3WCs for wideband filtering, based on high-silica waveguides on Si. The devices have been fabricated by a combination of Flame Hydrolysis Deposition, photolithographic patterning and reactive ion etching. The design has been directed towards the filtering of the amplified spontaneous emission in Nd-doped fluoride fibre amplifiers operating at 1.3 [?m], which limits the magnitude of the amplifier gain and requires wideband filtering operation to be suppressed. However, a similar arrangement would also find useful application in other devices such as a multi/demultiplexer for widely spaced channels or when wider rejection bandwidths are required to cover the wavelength variation of laser sources in practical conditions.

Paper Details

Date Published: 1 December 1991
PDF: 7 pages
Proc. SPIE 1583, Integrated Optical Circuits, (1 December 1991); doi: 10.1117/12.50881
Show Author Affiliations
Giovanni Barbarossa, Univ. of Glasgow (United Kingdom)
Peter J. R. Laybourn, Univ. of Glasgow (United Kingdom)

Published in SPIE Proceedings Vol. 1583:
Integrated Optical Circuits
Ka Kha Wong, Editor(s)

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