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Space-wavelength trade-off in the design of nonblocking directional-coupler-based networks under crosstalk constraint

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2 Author(s)
Mehdi Vaez, M. ; AT&T Bell Labs., Middletown, NJ, USA ; Chin-Tau Lea

Directional couplers are electro-optical switching devices that are capable of switching multiple wavelength signals. Once the state of a coupler is set up, optical signals can pass through the coupler with a rate of tera bits per second. A directional coupler-based photonic switching system however, suffers from the intrinsic crosstalk problem. This shortcoming has been the most limiting factor in building a large switching network of this kind. It has been shown that by using more hardware (couplers) we can reduce the number of crosstalk-generating couplers along the path of a connection in a Banyan-type switching system. We explore the wavelength approach to achieve this task. We show that if there are two wavelengths available, the number of couplers suffering the first-order crosstalk can be reduced to zero while the total number of couplers will remain the same as a network without any crosstalk constraint

Published in:

Communications, 1998. ICC 98. Conference Record. 1998 IEEE International Conference on  (Volume:3 )

Date of Conference:

7-11 Jun 1998