A Photonic Switch Architecture Utilizing Code Division Multiplexing

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Abstract
Code-Division Multiplexing (CDM) is a technique that can be used in photonic switching architectures. CDM can be used to make each optical input channel orthogonal to every other input channel so that the sum of all the orthogonalized input channels can be presented to a decoder at each output port of the switch. The actual output signal on each port can be selected to be anyone of the input signals by using the appropriate code for selection. This is possible because of the correlation property of an orthogonal code family. ϕ i , and ϕ j are members of the code family that are used to orthogonalize the input bits, and T is the duration of any code sequence and the duration of any input bit. This is the means by which any input signal can be switched to any or all outputs (customers). Therefore, the resultant switch is non-blocking with broadcast capability. The basic structure of a switch that uses an orthogonal code family is shown in Figure 1.

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