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Proceedings Paper

Homodyne cross-talk penalty in large strictly nonblocking optical switches based on directional couplers
Author(s): Luis Goncalo C. Cancela; Joao Jose De Oliveira Pires
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Paper 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.

Paper Details

Date Published: 18 October 2001
PDF: 10 pages
Proc. SPIE 4582, Optical Switching and Optical Interconnection, (18 October 2001); doi: 10.1117/12.445099
Show Author Affiliations
Luis Goncalo C. Cancela, Instituto Superior Tecnico (Portugal)
Joao Jose De Oliveira Pires, Instituto Superior Tecnico (Portugal)


Published in SPIE Proceedings Vol. 4582:
Optical Switching and Optical Interconnection
Lih-Yuan Lin; Shulian Zhang, Editor(s)

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