概要（Overview）

The Keysight 81634B is a highly sensitive (-110 dBm) optical power sensor offering precise power measurements with an uncertainty of ±2.5% and minimal polarization dependence (<±0.005 dB). Compatible with all Keysight 816x Lightwave mainframes, this modular unit supports both single and multi-channel device testing. It features NIST and PTB traceability and accommodates various connectors, including a bare-fiber adapter. Ideal for applications requiring data logging and spectral analysis, it provides synchronized measurements with tunable lasers and can log up to 20,000 samples with 100µs averaging time for efficient and high-resolution results.