| http://www.w3.org/ns/prov#value | - Referring to FIG. 3A, an input optical signal 303 is transmitted in waveguide 301 over N wavelengths ??1, ??2, ??3, . . . ??N where N is a positive integer, which is coupled to waveguide 302 such that (a) a contra-directional coupling signal 305 with a central wavelength ??i particular to the Bragg gratings is guided into waveguide 302, (b) a co-directional coupling signal 306 with a central wavel
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