The HP/Agilent 81613A Return Loss Module is a precision instrument for measuring return loss and reflection in single-mode fiber optic components. It combines an integrated Fabry-Perot laser source with a power monitor, enabling standalone measurements or integration with external light sources. The module installs in HP/Agilent 816x series Lightwave mainframes (8163B, 8164B, 8166B) and delivers return loss measurements with dynamic range exceeding 75 dB across the 1250 nm to 1640 nm window.
Technical Specifications
• Return Loss Dynamic Range: Greater than 75 dB
• Return Loss Uncertainty: ±0.25 dB with external broadband source; add ±0.2 dB relative uncertainty with Agilent Fabry-Perot sources
• Integrated Laser Source: Fabry-Perot type at 1310 nm and 1550 nm
• Laser Output Power: −4 dBm (typical)
• Wavelength Range: 1250 nm to 1640 nm
• Fiber Type: Single-mode 9/125 µm
• Power Monitor: Integrated, compensates for external source power variations
– Key Features
• Integrated power monitor and laser source eliminate need for separate external sources
• Self-calibration capability reduces recalibration overhead during test cycles
• Measurement principle calculates return loss from input and reflected optical power
• Integrated circuits correct coupling and detection ratios, eliminate dark current and residual backscatter effects
• Built-in guided wizard (with 8163B mainframe) streamlines calibration and measurement workflows
• Factory-calibrated parameters enable immediate operation
– Typical Applications
• Return loss characterization of single-mode fiber optic components
• Reflection measurement in component validation and production test
• Swept-wavelength return loss measurements via 816x Plug&Play Driver automation
• Combined return loss and insertion loss assessment with external Agilent power sensors in 8163B mainframe
– Compatibility & Integration
• Mainframe Compatibility: 8163B, 8164B, 8166B Lightwave Mainframes
• Connectors: Angled connectors required at input and output; 81000SI (DIN47256/4108) interface required
• Reference Cable: 81610CC recommended
• External Sources: Compatible with fixed-wavelength and tunable laser sources
