Patent ID: 6825971
Filing Date: 2004-11-30
Classification: G02F

Abstract:
A method for converting wavelength-channels in a network having a bÃ—b space switch and a difference-frequency converter, the method comprising:selectively directing an incoming wavelength channel through the bÃ—b space switch to the difference-frequency converter and converting the frequency of the incoming wavelength channel by pumping with a pump frequency of the form 2f0+{(Wâˆ’1)Â±dbi}&Dgr;f, wherein d=0, 1, . . . , bâˆ’1, f0 is a base frequency, W is the number of wavelengths, &Dgr;f is a frequency spacing between adjacent channels, and i=0, 1, . . . logb Wâˆ’1.