HP / Agilent 81637B Fast Power Meter

The HP/Agilent 81637B Fast Power Meter delivers high-speed optical power measurement with exceptional dynamic range for demanding test and characterization applications. Data acquisition completes in 25 µS, enabling real-time analysis across swept wavelength and WDM component testing. The instrument captures up to 100,000 data points and maintains ±0.005 dB PDL dependency—critical for polarization-sensitive device characterization without range switching penalties.

## Technical Specifications

• Data Acquisition Time: 25 µS
• Dynamic Range: 90 dB total; greater than 55 dB within single range without switching
• Data Storage Capacity: 100,000 data points
• Polarization Dependent Loss (PDL): ±0.005 dB
• Spectral Ripple: Present

## Key Features

The fast 25 µS sampling rate supports high-resolution swept-wavelength measurements and transient power monitoring. Single-range dynamic range exceeding 55 dB eliminates measurement artifacts from autoranging, while the 90 dB total range accommodates both high-power and low-power regimes. Exceptionally low PDL dependency ensures accurate results on devices where polarization effects compromise standard meters. Onboard storage of 100,000 points enables post-acquisition analysis without continuous PC data streaming.

## Typical Applications

• Swept lambda characterization of optical components
• PDL-critical device testing and validation
• WDM component performance over wavelength
• High-speed power monitoring in research and manufacturing environments

## Compatibility & Integration

The 81637B integrates with Keysight 816xB family optical mainframes and modules. Optical interface connectors are sold separately. The meter operates on AC 100 to 240 V ± 10%, 50/60 Hz supply voltage. Note: Keysight 8163B Series modules are not compatible with the HP 8153A Lightwave Multimeter.