Parametric wavelength interchanging cross-connect

Details Parametric wavelength interchanging cross-connect Parametric wavelength interchanging cross-connect

1995-12-06

1998-10-20

Bacares, Rafael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359128, H04J 1400

Patent

active

058255176

ABSTRACT:
A wavelength-interchanging cross-connect for use as an optical switch within a wavelength-division multiplexing (WDM) communications network in which multiple optical carrier signals at different optical wavelengths are switched in an all-optical process according to their wavelength. The cross-connect of the invention further allows the optical wavelength of the signal being switched to be changed to another WDM wavelength. The cross-connect includes a series of multi-wavelength 2.times.2 spatial optical switches. One serial path is directly connected between the spatial switches. The other serial path leads through intermediate wavelength-interchanging modules that interchange the carrier wavelengths of at least one pair of signals. Preferably, the wavelength interchanging is performed by difference frequency generation relying on second-order non-linear susceptibilities and a pump signal providing parametric gain. The frequency of the pump signal is chosen to be the sum of the frequencies of whatever optical signals are to be interchanged, and more than one pair can simultaneously be interchanged. The placement of the pumping frequencies is determined by a design process using a modified version of a recursively designed Benes network. As a result, the wavelength-interchanging cross connect can be controlled by the well known looping algorithm known for Benes networks to be rearrangeably non-blocking.

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