Patent ID: 8064769
Filing Date: 2011-11-22
Classification: G02B,H04J

Abstract:
1. A method for switching from a first optical path optically coupled to an optical processing device to a second optical path, said first and second optical paths optically connecting, in parallel configuration, a first optical switch to a second optical switch, comprising: directing a wavelength-division multiplexed (WDM) optical signal comprising at least a first operating wavelength through the first optical path to the optical processing device which is tuned to the first operating wavelength; tuning a resonant all-pass filter optically coupled to the second optical path to have a resonant wavelength corresponding to the first operating wavelength so as to match, at least at a wavelength adjacent to the first operating wavelength, a phase distortion introduced by the optical processing device on said optical radiation, the resonant all-pass filter having a wavelength-independent amplitude transfer function in a wavelength band including the WDM optical signal; and synchronously actuating the first and the second optical switches so as to switch said optical radiation from the first optical path to the second optical path.