Keysight 81620C Silicon Optical Power Sensor for 850nm Testing

The Keysight 81620C Silicon Optical Power Sensor for 850 nm Testing is a high-precision, large-area silicon-detector-based optical power head designed for accurate, low-noise power measurement of fiber optic and free-space optical signals in component characterization, manufacturing, and laboratory applications. It supports a wavelength range from 450 nm to 1020 nm optimized for 850 nm short-wavelength testing, averaging times from 100 µs to 10 s, auto-ranging capability, min/max monitoring, dual 1M sample logging buffers with internal or external triggering, simultaneous measurement and readout for minimal overhead, and analog voltage outputs proportional to optical power for direct fiber alignment feedback, enabling reliable VCSEL characterization, multimode transceiver testing, and polarization-dependent loss measurements when paired with tunable laser sources. With a remote-head form factor compatible with the Keysight 81618A single and 81619A dual head interface modules and the 8163B/8164B/8166B mainframes or N7749C interface, it delivers dependable, flexible, high-accuracy characterization for advanced photonic R&D and production environments.