Homodyne cross-talk penalty in large strictly nonblocking optical switches based on directional couplers

Luis Goncalo C. Cancela; Joao Jose De Oliveira Pires

doi:10.1117/12.445099

18 October 2001 Homodyne cross-talk penalty in large strictly nonblocking optical switches based on directional couplers

Luis Goncalo C. Cancela, Joao Jose De Oliveira Pires

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Proceedings Volume 4582, Optical Switching and Optical Interconnection; (2001) https://doi.org/10.1117/12.445099
Event: Asia-Pacific Optical and Wireless Communications Conference and Exhibit, 2001, Beijing, China

Abstract

Imperfect isolation of switching elements inside optical space switches gives rise to leakage signals that results in homodyne crosstalk. An analysis of the impact of this phenomenon is developed considering an architecture based on a strictly non-blocking Horizontal Expanded and Vertical Replicated Banyan network and implemented using directional couplers. The analysis uses a rigorous approach based on the Gaussian Quadrature Rules method. The obtained results show that there is a compromise between the power penalty due to homodyne crosstalk and the network cost. In particular, a 1024 X 1024 optical switch, obtained by expanding the basic Banyan network with seven more stages, and with a switching element crosstalk of - 35 dB, gives a power penalty of 2.8 dB and requires a minimum of 117760 switching elements. However, if a network with no horizontal expansion is used, the power penalty can be reduced to approximately 1.2 dB, but the number of switching elements must increase to 369664.

Citation Download Citation

Luis Goncalo C. Cancela and Joao Jose De Oliveira Pires "Homodyne cross-talk penalty in large strictly nonblocking optical switches based on directional couplers", Proc. SPIE 4582, Optical Switching and Optical Interconnection, (18 October 2001); https://doi.org/10.1117/12.445099

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KEYWORDS

Switching

Switches

Homodyne detection

Optical switching

Directional couplers

Interference (communication)

Optical components

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