HP / Agilent 81610A Return Loss Module

The HP/Agilent 81610A Return Loss Module is a plug-in instrument for 816x lightwave mainframes that measures optical return loss and reflection characteristics across single-mode fiber optic components and broadband devices. Operating with an external laser source, it delivers return loss measurements exceeding 70 dB dynamic range with uncertainties down to ±0.25 dB using broadband sources and specific calibration conditions. The module incorporates InGaAs detection, power monitoring, and a guided calibration wizard to simplify accurate measurement setup and execution.

– Technical Specifications

• Dynamic Range: >70 dB for return loss
• Return Loss Uncertainty: ±0.25 dB (broadband source, specific calibration); ±0.2 dB (with 81610CC calibrated reference cable)
• Operating Wavelength Range: 1250 nm to 1640 nm
• Fiber Type: Single-mode 9/125 µm
• Sensor Element: InGaAs
• External Input Power Range: 0 dBm to 10 dBm (maximum); 16 dBm damage threshold
• Insertion Loss: Approximately 7 dB
• Operating Temperature: 10°C to 40°C
• Warm-up Time: 20 minutes (60 minutes if module stored at different temperature)
• Dimensions: 75 mm (H) × 32 mm (W) × 335 mm (D)
• Weight: 0.6 kg
• Humidity: Non-condensing

– Key Features

• Power monitor for stable, accurate return loss measurements
• Built-in guided wizard for simplified calibration and measurement workflows
• Integrated dark current and residual backscatter compensation
• Angled contact (8°) input/output connectors with DIN47256/4108 interface support

– Typical Applications

• Characterization of single-mode fiber optic components
• Broadband device reflection analysis
• Return loss and reflection coefficient determination across 1250–1640 nm

– Compatibility & Integration

The 81610A integrates with Agilent 8163A, 8164A, and 8166A Lightwave Multimeter/Measurement System/Multichannel System mainframes. External fixed-wavelength or tunable laser sources are required for operation. The optional 81610CC calibrated reference cable enables specified uncertainty performance.