Agilent 81625A High Powered Optical Head Interface

The Agilent 81625A is a high-powered optical head interface for precision measurement of optical signals across extended wavelength ranges and power levels. It integrates with modular lightwave multimeter systems to deliver stable, traceable readings in telecommunications, DWDM, and broadband testing. The unit employs a 5 mm InGaAs detector and accepts multiple fiber types through interchangeable connector adapters, making it suitable for laboratory and field applications involving connectorized fibers, bare fibers, and open beam configurations.

– Technical Specifications

• Detector Type: InGaAs
• Detector Size: 5 mm diameter
• Wavelength Range: 850 nm to 1650 nm
• Power Range: +20 dBm to −80 dBm
• Wavelength Accuracy: ±4.0% (950 nm to 1630 nm)
• Linearity: CW +20 dBm to −60 dBm (950 nm to 1630 nm)
• Applicable Fiber Types: Standard single-mode and multimode (maximum 100 µm core, NA < 0.3)

– Key Features

• High optical power handling up to +20 dBm with extended measurement range to −80 dBm
• Five connector adapter options: FC/PC (81000FA), SC/PC (81000KA), E-2000 (81000PA), ST/PC (81000VA), and LC/PC (81003LA)
• NIST-traceable calibration ensures measurement accuracy
• Includes magnetic D-shape adapter and protective stand
• Operation above +34 dBm (2.51 W) requires user awareness of potential thermal effects per IEC 61010-1

– Typical Applications

Optical power and wavelength measurement in DWDM systems, fiber-optic component characterization, signal path analysis, and broadband network testing where wide dynamic range and wavelength coverage are required.

– Compatibility & Integration

The 81625A requires either an Agilent 81618A (single) or 81619A (dual) interface module and operates within Agilent 8163A/B, 8164A/B, and 8166A/B lightwave multimeter mainframes.