The Keysight N4373C is a lightwave component analyzer engineered for S-parameter characterization of high-speed electro-optical devices from 10 MHz to 40, 50, and 67 GHz. It delivers absolute frequency response accuracy of ±1.2 dB at 50 GHz and ±1.8 dB at 65 GHz, with relative accuracy of ±0.8 dB and ±1.3 dB respectively. The instrument combines network analyzer architecture with integrated optical transmitters at 1310 nm and 1550 nm for IEEE 802.3ba compliance, plus external optical source capability across 1300–1600 nm via polarization-maintaining fiber input.
Designed for on-wafer and component-level measurements, the N4373C qualifies responsivity, 3 dB cutoff frequency, and optical path length while characterizing fiberoptic transponders and electro-optical transmission systems. Selectable optical output power and user-configurable transmitter wavelengths adapt to diverse test scenarios. A streamlined calibration methodology eliminates time-consuming optical alignment and automates electrical calibration, reducing setup time to minutes rather than hours.
Technical Specifications
• Frequency range: 10 MHz to 67 GHz
• Modulation bandwidth: up to 67 GHz
• Absolute frequency response accuracy: ±1.2 dB (50 GHz), ±1.8 dB (65 GHz)
• Relative frequency response accuracy: ±0.8 dB (50 GHz), ±1.3 dB (65 GHz)
• Internal transmitter wavelengths: 1310 nm, 1550 nm
• External optical input range: 1300–1600 nm
• Optical input: polarization-maintaining fiber (PMF)
– Key Features
• Integrated S-parameter testing of electro-optical components
• Automated electrical calibration with operator-independent optical calibration
• User-selectable optical transmitter output power
• Internal length calibration for electrical and optical path determination
• Network analyzer interface familiar to Keysight NA users
– Typical Applications
• IEEE 802.3ba 40/100G transmission system component qualification
• Radio over Fiber (RoF) system characterization
• Aerospace and defense 60 GHz component testing
• On-wafer opto-electronic device measurement
– Compatibility & Integration
Accepts external optical sources via PMF input switch, supporting wavelength-agnostic testing across the 1300–1600 nm window.
