Following optical heads are used with these interfaces:
81623B Ge, +10dBm to -80dBm
81624B 5mm InGaAs, +10dBm to -90dBm
81626B InGaAs, +27 dBm to - 70 dBm
81628B InGaAs, +40 dBm to - 60 dBm

Fully compatible with all 8152x and 8162x Optical Heads.
Fits in Mainframe all of 8163/8164/8166 series.
Flexibility through 1- and 2- channel option.