The Keysight 81578A is a variable optical attenuator (VOA) module engineered for multimode fiber applications in Keysight’s Lightwave Solution Platform mainframes. This single-slot plug-in delivers precise attenuation control from 0 dB to 60 dB with 0.001 dB resolution across the 700 nm to 1400 nm wavelength range. Manual and remote GPIB control enable laboratory and production testing of telecommunications and data communication systems. An integrated shutter supports power meter zeroing and channel drop simulation. The module accepts 50 µm or 62.5 µm multimode fiber with FC/PC connectors and offers repeatability of ± 0.015 dB and typical accuracy of ± 0.15 dB (800–1350 nm) or ± 0.2 dB at 850 nm and 1310 nm. Maximum input power is +27 dBm.
Technical Specifications
• Attenuation Range: 0 dB to 60 dB
• Attenuation Resolution: 0.001 dB
• Wavelength Range: 700 nm to 1400 nm
• Repeatability: ± 0.015 dB
• Accuracy: ± 0.15 dB (800–1350 nm); ± 0.2 dB at 850 nm and 1310 nm
• Return Loss: 27 dB (typical, flat polished connectors)
• Maximum Input Power: +27 dBm
• Insertion Loss (62.5 µm MMF, typical): 1.0 dB (NA=0.1), 1.3 dB (NA=0.2), 2.0 dB (NA=0.2), 3.0 dB (NA=0.27)
• Fiber Core Options: 50 µm or 62.5 µm multimode
• Connector: FC/PC (multimode)
• Control Interface: GPIB
– Key Features
• Single-slot plug-in module design for compact mainframe integration
• Integrated shutter for power meter zeroing and channel drop simulation
• Reference power calibration for relative attenuation and power level display
• Manual and remote control via common GPIB interface
– Typical Applications
• Telecommunications system testing
• Data communication system characterization
• Optical power control and measurement validation
– Compatibility & Integration
The 81578A operates within Keysight 8163A/B, 8164A/B, and 8166A/B Lightwave Solution Platform mainframes. It is backward compatible with older 815xx and 816xx series modules in compatible hosts. Power is supplied directly by the mainframe.
