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24 August 1992 Novel architecture for optical guided-wave recirculating delay lines
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We present a novel architecture for an optical guided-wave recirculating (feed-backward) delay line, which is suitable for planar implementation, and is capable of performing very high speed optical processing. The chain matrix has been demonstrated in the z-transform domain and its identity with conventional fiber-optic architecture has been demonstrated. This novel architecture is based only on loops and directional couplers and does not include intersecting or branching sections, which notoriously increase the overall loss of an integrated optical circuit. Compared to other planar solutions reported in literature, such as those based on integrated beam splitter/combiners or gratings, the present architecture does not present counter directional recirculation, and does not suffer from in-plane scattering and diffraction limitation, being based on channel waveguides. Moreover, because of an extra zero-pole in its transfer function, it results more flexible in a design of appropriate spectral responses for filtering operations. As an application of the presented architecture a Toeplitz matrix-vector multiplier is presented.
© (1992) 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 "Novel architecture for optical guided-wave recirculating delay lines", Proc. SPIE 1704, Advances in Optical Information Processing V, (24 August 1992);

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