The HP/Agilent 81612A Return Loss Module delivers high-precision return loss measurements across the 1250 nm to 1640 nm optical band. This plug-in module integrates a power sensor, monitor diode, dual couplers, and internal laser source to streamline characterization of fiber optic components and systems. Dynamic range exceeds 70 dB with measurement uncertainty as low as ±0.2 dB using a broadband source, making it ideal for manufacturing, R&D, and quality control environments requiring detailed optical performance data.
## Technical Specifications
• Return Loss Dynamic Range: Greater than 70 dB
• Return Loss Uncertainty: ±0.2 dB (broadband source)
• Wavelength Range: 1250 nm to 1640 nm
• Output Power (Internal Source): Typically −4 dBm
• Optical Connectors: APC (angled physical contact) at input and output
• Operating Temperature: 10°C to 40°C
• Storage/Shipment Temperature: −40°C to +70°C
• Humidity: Non-condensing
• Warm-up Time: 20 minutes (60 minutes if not previously stored at operating temperature)
• Dimensions: 75 mm × 32 mm × 335 mm
• Weight: 0.6 kg
## Key Features
• Measures optical power incident on and reflected from the device under test
• Calculates and displays return loss automatically
• Built-in Return Loss Wizard guides calibration and measurement setup
• Internal components eliminate dark current effects and residual backscatter
• Compatible with external power meter modules for simultaneous insertion loss measurements
• APC connector interface (8° angled contact) ensures repeatable coupling
## Typical Applications
• Fiber optic component characterization
• Manufacturing quality assurance
• Research and development testing
• System performance verification
## Compatibility & Integration
The 81612A installs in Agilent/Keysight 816xA series mainframes: 8163A/B Lightwave Multimeter, 8164A/B Lightwave Measurement System, and 8166A/B Lightwave Multichannel System. The 81610CC Reference Cable (DIN47256/4108 connector interface) is recommended for calibration.
