A method or corresponding apparatus in {TAIL ~ an example} embodiment of the present invention relates to routing of optical wavelengths in an optical network having {HEAD ~ multiple optical network nodes} 
A method or corresponding apparatus in { TAIL ~ an example } embodiment of the present invention relates to routing of optical wavelengths in an optical network having { HEAD ~ multiple optical network nodes }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD