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