The Keysight 8156A is a programmable optical attenuator engineered for precise control of optical power in fiber optic systems across research, development, and production environments. Option 101 delivers exceptional return loss performance (>45 dB typical) with low insertion loss of 2.5 dB, supporting single-mode and multimode fiber applications from 1200 nm to 1650 nm. The instrument provides 60 dB attenuation range with 0.001 dB resolution and ±0.05 dB accuracy, plus wavelength-dependent attenuation correction and programmable sweep capabilities.
Technical Specifications
• Attenuation Range: 60 dB
• Resolution: 0.001 dB
• Attenuation Accuracy: ±0.05 dB typical
• Wavelength Range: 1200 nm to 1650 nm
• Return Loss (Option 101): >45 dB typical
• Insertion Loss (Option 101): 2.5 dB typical
• Polarization Sensitivity: <0.02 dB peak-to-peak
• Switching Time: 20–400 ms
• Maximum Input Power: +23 dBm
• Fiber Types: Single-mode, 9/125 µm single-mode, 50 µm multimode
• Operating Temperature: 0 °C to 55 °C
• Power Supply: 100/120/220/240 Vrms ±10%, 90 VA max, 45–400 Hz
• Dimensions: 212.3 mm W × 89 mm H × 345 mm D
• Weight: 5.3 kg net
– Key Features
• Single filter design eliminates ranging errors, dark spots, and attenuation overshoots or undershoots
• Automatic wavelength correction when properly calibrated
• Programmable attenuation sweep capability (up and down)
• Optional monitor output for real-time signal power measurement at attenuator output
• Back reflector mode operation (with external reference reflector) for component and system reflection sensitivity testing
• HP-IB/GPIB control interface
– Typical Applications
• Optical power control in telecom system testing
• Component sensitivity characterization to reflection
• Production-level fiber optic measurement and validation
• Dynamic attenuation profiling for optical signal analysis
– Compatibility & Integration
Standard configurations feature FC/PC connector interfaces (sold separately). Option 101 uses straight polished contact (PC) connections. Environmental rating: Installation category II, pollution degree 2, maximum altitude 2000 m, indoor use only.
