ThorLabs S151C – Compact Fiber Photodiode Power Sensor

The Thorlabs S151C is a compact fiber photodiode power sensor for precise optical power measurements in fiber optic systems. It delivers reliable performance across the visible and near-infrared spectrum with NIST and PTB traceable calibration data embedded in the sensor connector. The S151C integrates directly with Thorlabs power meter consoles via USB and Sub-D connector, supporting multiple fiber adapter types for flexible deployment.

– Technical Specifications

• Sensor Type: Silicon photodiode
• Wavelength Range: 400 nm to 1100 nm
• Power Measurement Range: 1 nW to 20 mW
• Power Resolution: 100 pW
• Linearity: ±0.5%
• Measurement Uncertainty: ±3% (440 nm – 980 nm), ±5% (400 nm – 439 nm), ±7% (981 nm – 1100 nm)
• Maximum Detectable Pulse Energy: 20 μJ
• Aperture Filter: Absorptive ND (Schott NG3)
• Cooling Method: Convection
• Calibration: Spectrally calibrated across entire operating wavelength range; annual recalibration recommended

– Key Features

• Detector calibration data stored in sensor connector for immediate system verification
• Sub-D connector with self-fixing mechanism ensures repeatable mating
• Compact form factor optimized for fiber-integrated measurement configurations
• Compatible with APC, FC, LC, SC, and ST fiber connector standards via optional adapters
• No user-serviceable parts; cleaning limited to external housing and compressed-air aperture maintenance

– Typical Applications

• Continuous optical power monitoring in fiber optic transmission systems
• Pulsed laser characterization and energy measurement
• Spectral power validation across visible through near-IR wavelengths
• Calibration verification and secondary standard use in lab environments

– Compatibility & Integration

The S151C operates with PM100D, PM100USB, PM100A, PM100D2, PM100D3, PM400, PM101, and PM103 series consoles. Standard package includes PM20-FC and PM20-SMA adapters. Not compatible with legacy PM100, PM30, PM300, PM300E, or S100 consoles.