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1 December 1991 High-silica cascaded three-waveguide couplers for wideband filtering by flame hydrolysis on Si
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Proceedings Volume 1583, Integrated Optical Circuits; (1991)
Event: OE Fiber, 1991, Boston, MA, United States
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.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Giovanni Barbarossa and Peter J. R. Laybourn "High-silica cascaded three-waveguide couplers for wideband filtering by flame hydrolysis on Si", Proc. SPIE 1583, Integrated Optical Circuits, (1 December 1991);


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