Agilent/Keysight 71451B – Optical Spectrum Analyzer

The Agilent/Keysight 71451B is a diffraction-grating-based optical spectrum analyzer engineered for precise spectral measurements of optical power versus wavelength across the visible and near-infrared spectrum. Built around a unique double-pass monochromator architecture, it delivers real-time sweep capability with -90 dBm sensitivity and 60 dB dynamic range, making it ideal for characterizing optical components, amplifiers, LEDs, and lasers in network testing and R&D environments.

Technical Specifications

• Wavelength Range: 600 nm to 1700 nm


• Wavelength Accuracy: ±0.3 nm


• Sensitivity: -90 dBm


• Dynamic Range: 60 dB


• Maximum Measurable Power Level: +10 dBm (before compression)


• Maximum Safe Photodetector Input: +20 dBm


• Maximum Input Power (MONOCHROMATOR INPUT): +30 dBm


• Amplitude Flatness (≥2 dBm input): ±0.4 dB


• Amplitude Accuracy: Excellent


• Polarization Dependence: Low


• Span Range: 0.2 nm to full range, zero span supported


• Operating Temperature: 0°C to 55°C


• Relative Humidity: <95%


• Dimensions: 24 × 20 × 16 in


• Weight: 50 lbs

Key Features

• Double-pass monochromator design for enhanced spectral purity


• Real-time sweep rates for dynamic signal observation


• Low polarization dependence minimizes measurement artifacts


• External trigger capability via rear-panel EXT TRIG IN connector for gated sweep operation


• Monochromator output connector enables external signal routing


• Includes HP 70951B module

Optical Interfaces

• Front-panel MONOCHROMATOR INPUT connector (primary signal input)


• Front-panel MONOCHROMATOR OUTPUT connector (external monochromator output)


• Rear-panel EXT TRIG IN for external triggering

Operating Requirements Specifications apply after 1 hour thermal stabilization and completion of auto-align routine. Avoid thermal shock to prevent condensation. Proper earth grounding and ESD precautions required at rear-panel connectors.