Optical waveguides – With optical coupler – Input/output coupler
Patent
1996-07-17
1998-01-06
Ngo, John
Optical waveguides
With optical coupler
Input/output coupler
385 24, 385 46, 385 14, G02B 626
Patent
active
057063770
ABSTRACT:
A wavelength routing device 500 includes a pair of dielectric slabs 10, 20 that are interconnected by an optical grating 30. The first dielectric slab 10 includes input ports for receiving optical signals that are routed to output ports of the second dielectric slab 20 according to their wavelengths. Y-branch splitters 70-1 are connected to the first dielectric slab. Splitters 70-1 each include a pair of adjacent waveguides, having widths (w.sub.1), that are separated from each other by a center-to-center distance (c.sub.1). Y-branch splitter 70-2 is connected to the second dielectric slab. Splitter 70-2 includes a pair of adjacent waveguides, having widths (w.sub.2), that are separated from each other by a center-to-center distance (c.sub.2). Preferably, 4w.sub.2 >w.sub.1 >1.5w.sub.2, and 4c.sub.2 >c.sub.1 >1.5c.sub.2. Associated with this routing device is a figure-of-merit (B.sub.1 /B.sub.2) that exceeds 0.5, which represents a substantial improvement over prior art designs. Such devices 500 are particularly useful in applications where they need to be cascaded.
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Takahashi, et al., "Arrayed-Waveguide Grating For Wavelength Division Multi/DeMultiplexer With Nanometere Resolution," Electronics Letters, 1990, vol. 26, No. 2, 87-88.
Lucent Technologies - Inc.
Morra Michael A.
Ngo John
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