Abstract
This paper describes a waveguide crossing design that uses the wavefront
matching (WFM) method. The WFM method enables us to design waveguide crossings
with lower loss than simple crossings composed of two straight waveguides,
without any crosstalk degradation. We report the procedure for designing waveguide
crossings based on the WFM method and some experimental results. For experimental
confirmation, we made a waveguide crossing test circuit using silica-based
planar lightwave circuit (PLC) technology. By comparing the results obtained
with samples constructed with different $\Delta$ waveguides, we show that our design
method is very efficient for higher $\Delta$ waveguides suitable for high-density integration. In addition,
we describe an example application of our designed crossings to an integrated
PLC device, namely a wavelength multiplexer with a variable optical attenuator.
We show that waveguide crossings designed by the WFM method are useful for
improving the loss characteristic of highly integrated PLC devices.
© 2009 IEEE
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