Repair or Calibration of Agilent 81623B Optical Head

The Agilent 81623B Optical Head is a remote-head optical power measurement detector engineered for precision measurements across telecommunications, component testing, and R&D applications. Built around a 5 mm diameter Germanium detector, it delivers low Polarization Dependent Loss, low spectral ripple, and high return loss (>50 dB, typically >55 dB) performance. The unit interfaces with Agilent 81618A or 81619A interface modules, enabling integration into 8163B, 8164B, and 8166B multichannel mainframes. An analog output (BNC connector) provides voltage proportional to measured optical power for real-time monitoring and data logging.

– Technical Specifications

• Detector: Germanium (Ge), 5 mm diameter
• Wavelength Range: 750 nm to 1800 nm (standard); 450 nm to 1020 nm (Option E01)
• Power Measurement Range: +10 dBm to −80 dBm (standard); +10 dBm to −90 dBm (Option E01)
• Wavelength Accuracy: ±2.2% (1000 nm to 1650 nm); ±2.5% (800 nm to 1000 nm); ±2.2% (600 nm to 1020 nm with Option E01); ±1.7% available with special calibration (1000 nm–1650 nm)
• Return Loss: >50 dB, typically >55 dB
• Noise (peak to peak): <0.5 pW (700 nm to 900 nm)
• Minimum Averaging Time: 100 µs
• Analog Output: BNC connector

– Key Features

• Remote head design enables flexible positioning in confined or dynamic measurement setups
• Magnetic D-shape adapter supports quick connector changes
• Removable 81624DD adapter ring accommodates threaded connector adapters
• Low PDL and spectral ripple for high-fidelity component characterization

– Compatibility & Integration

Interface Modules: Agilent 81618A (single channel), Agilent 81619A (dual channel)

Mainframes: Agilent 8163A/B, 8164A/B, 8166A/B series

Connector Adapters (81000 series): FC/PC (81000FA), SC/PC (81000KA), E-2000 (81000PA), ST/PC (81000VA), LC/PC (81003LA)