Abstract
In this paper, the operation principles for optical switches based on two
multimode interference (MMI) couplers are discussed in detail. Based on the
analytical expressions of transfer matrix of the MMI couplers, the control
mechanism and principles of the two-stage MMI coupler based switch are
derived. The device can be controlled by proportionally adjusting the
interstage variable phase shifter array. $N$ different switching states can be realized on this device.
© 2011 IEEE
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