Hi all: Does anybody know what the range of the P and B doping in the top gladding of wave guides is. In other words: What percentage of doping has the BPSG doped glass on top of wave guides? My next question would be: How precise does the doping have to be? Pointers to literature would be appreciated. Thanks for your input. Thomas __________________________________________________________________ Gesendet von Yahoo! Mail http://mail.yahoo.de