The HP/Agilent 81578A is a variable optical attenuator module designed for multimode fiber applications within Agilent’s Lightwave Solution Platform. It delivers precise, adjustable attenuation of optical signals across a wide wavelength range with high resolution and low insertion loss. The module supports 50 µm and 62.5 µm fiber interfaces and integrates directly into compatible mainframes for component and system characterization in telecom and data communication testing.
## Technical Specifications
• **Fiber Type:** Multimode fiber; 50 µm or 62.5 µm core diameter
• **Wavelength Range:** 700 nm to 1400 nm
• **Attenuation Range:** 0 to 60 dB
• **Attenuation Resolution:** 0.001 dB (typical)
• **Maximum Input Power:** +27 dBm (2 Watts)
• **Insertion Loss:** <1.4 dB (typical); <1.3 dB at NA = 0.2
• **Return Loss:** 27 dB (typical, flat polished connectors)
• **Wavelength Flatness:** Excellent across operational range
## Key Features
• **Modular Integration:** Single-slot plug-in module for Agilent 8163A/B, 8164A/B, and 8166A/B mainframes
• **Integrated Shutter:** Built-in shutter for test equipment protection, simplified referencing, power meter zeroing, and channel drop simulation
• **Internal Calibration:** Enhanced calibration function enables reference power setting and displays attenuation and power levels relative to that reference
• **Power Control:** Configurations available with active power control to maintain specific output power levels and compensate for input power variations
## Typical Applications
• Optical network component characterization
• System-level testing in telecommunications environments
• Data communication signal attenuation and power management
• Multi-wavelength power reference and measurement applications
## Compatibility & Integration
The 81578A operates within Agilent's Lightwave Solution Platform via internal bus architecture. It utilizes standard Agilent optical interface connectors, including Option 062 for 62.5 µm MMF with PC connectors. The 8166A/B mainframe can accommodate up to 17 single-slot modules. Remote control capability is supported.
