Hi Guys I am trying to repair an old unit which uses half duplex serial communications to communicate with the other unit, it's used as a serial optic link. this system uses only one fibre as at the time it was built fibres were very expensive. Now the fibres are cheap so the requirement for the integrated RX and TX on the same module as disappear and is very hard to find. I normally use the Agilent HFBR series for single transmission but because I only have one fibre installed I have to use the same set-up. I am not looking for a module with all the other electronics as such, although I will consider it, but what I need is the SMA socket with the integrated Photodiodes for TX/RX in the same package. Does any of you seen this anywhere ? thanks for the help best regards Luis -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.