The Keysight (Agilent) N4373B 67 GHz Lightwave Component Analyzer characterizes electro-optical and opto-electrical components at frequencies up to 67 GHz. Designed for 40 Gb/s transmission systems, Radio over Fiber, and aerospace and defense applications, this instrument delivers absolute frequency response accuracy of ±0.9 dBe at 50 GHz and ±1.3 dBe at 67 GHz. It measures 3 dB cut-off frequency, responsivity, electrical reflection, group delay, insertion loss, and transmission bandwidth across optical and electro-optical domains.
Technical Specifications
Frequency Range
• 10 MHz to 67 GHz (N5227A optical test set)
Optical Specifications
• Operating wavelength: 1280 nm to 1625 nm
• Output wavelength: 1550 ± 20 nm
• Maximum linear average input power: +5 dBm (Input 1), +15 dBm (Input 2)
• Maximum safe average input power: +7 dBm (Input 1), +17 dBm (Input 2)
• Average power measurement range: −20 dBm to +5 dBm (Input 1), −10 dBm to +15 dBm (Input 2)
• Average power measurement uncertainty: ±0.5 dBo (typical)
• Optical return loss: > 27 dBo (typical)
• Output power range: −1 dBm to +5 dBm
• Output power uncertainty: ±0.5 dBo (typical)
• Output power stability (15 min): ±0.5 dBo (typical)
• Optical modulation index: > 5% typ. at 1 GHz, −8 dBm RF power
Accuracy
• Absolute frequency response: < 0.9 dBe @ 50 GHz, < 1.3 dBe @ 67 GHz (typical)
• Relative frequency response: < 0.5 dBe @ 50 GHz, < 1.3 dBe @ 67 GHz (typical)
Noise Floor
• E/O measurements: < −59 dB (W/A) at 67 GHz (N4373E)
• O/E measurements: < −55 dB (A/W) at 67 GHz (N4373E)
Connectors
• Electrical inputs/outputs: 1.85 mm LCA (m)
• Optical inputs: 9 μm single-mode angled with universal adapter
• Optical output: 9 μm polarization-maintaining single-mode
– Key Features
• Built-in average power meter for transmitter power test
• User-selectable optical transmitter output power
• Polarization-maintaining optical output for reliable modulator testing
• Automated electrical calibration
• Temperature-stabilized core components for repeatability and accuracy
• Measurement speed exceeds prior 86030A instruments by factor of 10×
– Typical Applications
• 40 Gb/s transmission system component validation
• Radio over Fiber (RoF) system characterization
• Aerospace and defense electro-optical component testing
