Planar star couplers with reduced insertion loss
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United States of America Patent
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May 10, 2005
Grant Date -
Aug 19, 2004
app pub date -
Feb 14, 2003
filing date -
Feb 14, 2003
priority date (Note) -
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Abstract
In a star coupler, a Free Propagation Region (FPR) is bounded by a first interface and a second opposing interface, and guides an input signal launched from the first interface in a predetermined first plane while allowing the input signal to travel unguided in a predetermined second plane in the FPR which is orthogonal to the first plane. A plurality of output waveguides are formed in an array and terminate at the second interface of the FPR. The axis of each output waveguide at the second interface is separated from an axis of an adjacent output waveguide by a predetermined distance 't'. An input waveguide is split into a plurality of subsections which each terminate at the first interface of the FPR. The subsections of the input waveguide are arranged for simultaneously launching parts of the input signal into the FPR which diffracts and produces mode patterns at the second interface having a maximum intensity at inputs of each of the output waveguides, and a low intensity elsewhere.
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