I remember them saying with regards to GaAs that they could not access(or whatever) the 4th pin and that it could be done but that it would take a tremendous amount of money to do it and it was away out of Poet's range. Thank God, they found something just as good or better and it's all ours, patents to prove it, and now all tested from Poet's end and working. And contracts signed and many more in the works.