Optical waveguides – Integrated optical circuit
Patent
1997-09-08
1999-07-20
Palmer, Phan T. H.
Optical waveguides
Integrated optical circuit
385 16, 385 37, 385 46, G02B 612
Patent
active
059265876
ABSTRACT:
Two or more wavelength routers are cascaded together to form a passband filter with low levels of crosstalk between different channels of a wavelength division multiplexing (WDM) stream. Cascading wavelength routers is a technique that can be used to efficiently realize wide and flat passbands, but high levels of cross-talk may result from multi-path interference caused by grating lobes, which produce unwanted transmission paths between the two routers. Spatial filtering can be applied to inhibit the propagation of light-energy along the unwanted paths, and it can be implemented using any suitable techniques including pinholes, reflectors, waveguides, and multi-mode interferometers (MMIs). The resulting passband filter can be designed to generate levels of crosstalk similar to those of conventional passband filters that rely on a single waveguide router.
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Chen Jerry Chia-yung
Dragone Corrado
Lucent Technologies - Inc.
Palmer Phan T. H.
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