In particular, the present invention relates to {TAIL ~ optical switches} having {HEAD ~ a greater number} of switching states than a conventional Generalized Mach Zehnder interferometer  
In particular , the present invention relates to { TAIL ~ optical switches } having { HEAD ~ a greater number } of switching states than a conventional Generalized Mach Zehnder interferometer
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH