The HP/Agilent 81576A is a variable optical attenuator module that provides precision control of optical power levels in fiber optic test systems. It functions as a plug-in module for Agilent’s Lightwave Solution Platform mainframes, delivering 0 dB to 60 dB attenuation with 0.001 dB resolution and ±0.1 dB accuracy across the C- and L-bands. The integrated power control function automatically compensates for input power fluctuations, maintaining a user-defined output power level—critical for characterizing optical amplifiers, DWDM systems, and complex transmission chains without manual recalibration between measurements.
Technical Specifications
• Wavelength Range: 1200 nm to 1700 nm; 1250 nm to 1650 nm
• Attenuation Range: 0 dB to 60 dB
• Attenuation Resolution: 0.001 dB
• Attenuation Accuracy: ±0.1 dB
• Repeatability: ±0.01 dB (10 mdB)
• Wavelength Flatness: <0.05 dB
• Return Loss: Typically 45 dB
• Maximum Input Power: +33 dBm (2 W)
• Attenuation Settling Time: Typically 100 ms
• Power Settling Time: Typically 300 ms
• Fiber Type: Single Mode Fiber (SMF28, 9/125 µm)
• Signal Distortion: Low PDL, PMD, and CD
– Key Features
• Power control with automatic feedback correction via integrated photodiode
• Direct output power setting in dBm or Watts
• Built-in and enhanced internal calibration with offset functionality for connector/patch cord losses
• Integrated shutter for channel simulation or optical protection
• Two-slot module occupancy in compatible mainframes
– Typical Applications
• EDFA and Raman amplifier characterization
• DWDM transmission system testing
• Optical amplifier gain and noise figure measurement
• Multi-channel power management in test configurations
– Compatibility & Integration
Plug-in module for Agilent/Keysight Lightwave Solution Platform mainframes: 8163A/B, 8164A/B, 8166A/B. Straight connector interface.
