The HP/Agilent 81551MM is a Fabry-Perot laser source module operating at 850 nm ± 10 nm, designed for precision optical testing and measurement applications. This InGaAsP laser delivers output power greater than −2 dBm into 50/125 µm multimode fiber with spectral bandwidth less than 1.5 nm rms. The module integrates with HP 8153A, 8163, 8164, and 8166 series mainframes to provide stable, accurate characterization of optical components and systems.
Technical Specifications
• Laser Type: Fabry-Perot
• Semiconductor Material: InGaAsP
• Central Wavelength: 850 nm ± 10 nm
• Output Power: > −2 dBm
• Spectral Bandwidth: < 1.5 nm rms
• Fiber Coupling: Multimode 50/125 µm
• Output Attenuation: 0 dB to 4 dB in 0.1 dB steps
• Short-term CW Stability: ±0.01 dB over 15 minutes at constant temperature
• Long-term CW Stability: ±0.06 dB over 6 hours at constant temperature
• Digital Modulation Modes: 270 Hz, 1 kHz, 2 kHz (50% duty cycle pulse shaping)
• Warm-up Time: 60 minutes full specification; 20 minutes if stored at operating temperature
• Laser Classification: Class 3A (IEC 825-1 non-USA); Class 1 (21 CFR 1040.10 USA)
• Operating Temperature: 0 °C to +55 °C
• Storage/Shipment Temperature: 0 °C to +70 °C
• Recalibration Interval: 1 year
– Key Features
• Adjustable output attenuation with 0.1 dB resolution for precise power control
• Selectable internal modulation at 270 Hz, 1 kHz, and 2 kHz
• Excellent CW stability: ±0.01 dB short-term, ±0.06 dB long-term
• Compact form factor: 75 mm (H) × 32 mm (W) × 335 mm (D); 0.7 kg net weight
• Analog output support: DC to 300 Hz or up to 1 kHz depending on configuration
– Typical Applications
Optical component characterization, fiber optic system testing, multimode fiber link validation, and precision power measurement at 850 nm wavelength.
– Compatibility & Integration
The 81551MM plugs directly into HP 8153A, 8163, 8164, and 8166 series mainframes. Optical output requires a user-exchangeable 8100XI series interface connector (sold separately), supporting Diamond HMS-10, FC/PC, D4, SMA, SC, ST, DIN, and Biconic connector types.
