The invention further comprises a method for switching of wavelength channels through {HEAD ~ the use} of {TAIL ~ said multi wavelength selective switch} 
of
The invention further comprises a method for switching of wavelength channels through { HEAD ~ the use } of { TAIL ~ said multi wavelength selective switch }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL