The HP 81536A optical power sensor module is designed for use in the HP lightwave multimeter mainframes.
Product Specs:
Sensor Element: InGaAs
Wavelength Range: 800 - 1700nm
Power Range: +3 to -70dBm
Uncertainty at Reference Conditions: 2.5% (1000 - 1650nm)
Total Uncertainty: 5% 50pW (1000 - 1650nm)