Abstract
Silica-based strictly nonblocking 8×8 matrix switches have thus far been successfully fabricated by integrating 64 thermo-optic (TO) Mach-Zehnder (MZ) switching units on a single Si substrate as shown in Fig. 1.1,2 The major problem with this type of MZ unit is that the constituent 3-dB couplers must be precisely set at 50% coupling in the waveguide fabrication process. This paper proposes improved MZ geometries for constructing low- crosstalk matrix switches with extremely large fabrication tolerances.
© 1993 Optical Society of America
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