Agilent/Keysight 71451A – Optical Spectrum Analyzer

The Agilent/Keysight 71451A is a optical spectrum analyzer for detailed spectral characterization across the 600 nm to 1700 nm wavelength range. Its unique double-pass monochromator design delivers the high dynamic range of double-monochromator systems combined with single-monochromator sensitivity, achieving better than -85 dBm sensitivity and 60 dB dynamic range. The instrument excels at LED, Fabry-Perot laser, DFB laser, and EDFA characterization with polarization-insensitive measurements and excellent amplitude accuracy.

Technical Specifications

• Wavelength Range: 600 nm to 1700 nm


• Monochromator: Double-pass design


• Sensitivity: Better than -85 dBm; -90 dBm


• Dynamic Range: 60 dB (-55 dBm at 0.5 nm offset)


• Resolution (FWHM): 0.08 nm, 0.1 nm to 10 nm (1, 2, 5 sequence)


• Resolution Accuracy: ±20% at approximately 0.5 nm (1250–1600 nm)


• Sweep Rate: 40 nm in 50 ms; full range in 500 ms


• Maximum Input Power: +20 dBm per 5 nm; +30 dBm total


• Wavelength/Amplitude Calibration: Full range; 2-year calibration retention


• Display Resolution: 0.01 dB


• Monochromator Insertion Loss: 850 nm <17 dB (1st order); 1300 nm <7 dB; 1550 nm <10 dB


• Photodetector Accuracy: 0.25 dB at -30 dBm (1300 nm reference); 1 dB compression at 27 dBm; maximum +20 dBm

Key Features

• Five operational modes


• Low polarization dependency


• Real-time sweep capability


• Optional programmable current source and white light source


• SMB electrical connectors; optional FC/PC connector interface

Physical & Environmental

• Single 9-inch mainframe: 222 mm H × 425.4 mm W × 526 mm D; 28 kg


• Power: 100/120/220/240 VAC (+5%, -10%); 260 W max (350 VA max); 47–66 Hz and 356–444 Hz


• Operating Temperature: 0° to 55° C


• Storage Temperature: -30° to +71° C


• Shock/Vibration: MIL-T-28800D Class 5 (paragraphs 3.7.4, 3.7.5.2)

Compatibility & Integration VXI bus compatible; integrates into modular test systems with single-slot VXI architecture.