H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
H04Q 3/52 (2006.01) H04B 10/20 (2006.01) H04Q 11/00 (2006.01)
Patent
CA 2361509
An NxN optical waveguide matrix switch using double-size butterfly network of 2x2 switching units is proposed in this invention. In the NxN matrix switches, the complexity, the power consumption, the wavelength sensitivity, the insertion loss, and the blocking are main problems. In this invention, the NxN optical waveguide matrix switch uses a double size butterfly.network where one size of the butterfly network is specially used for switching operations and the other one for balancing and testing the optical outputs at the OFF-state. So, not only can nonblocking degree be met, but also both the numbers of switching units and switching stages can be decreased. Especially in the large- scale NxN matrix switches, this advantage becomes more apparent. As a result, the complexity, the insertion loss and the power consumption can be significantly reduced. If the wavelength sensitive switching units are used in this type of devices, at the different operation levels, the switching units are designed at different central wavelengths to uniformly cover the whole wavelength range. So, the wavelength sensitivity of the whole device can be depressed. Therefore, the final performance of NxN optical matrix switch becomes low insertion loss, wavelength insensitive and nonblocking.
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