The Keysight N4373D Single-Mode Lightwave Component Analyzer characterizes high-speed electro-optical components and modules for telecommunications and data communications systems. Operating to 67 GHz, it validates performance across 40 Gb/s, 100 Gb/s, 400 Gb/s, and 1 Tbit/s transmission architectures. Built on the N522xA PNA Microwave Network Analyzer platform, the instrument delivers accurate S-parameter, group delay, and optical power measurements essential for lasers, modulators, detectors, and integrated receivers.
Technical Specifications
Frequency coverage spans 10 MHz to 43.5 GHz, 50 GHz, or 67 GHz depending on the selected network analyzer option. Absolute frequency response uncertainty reaches typically < 0.9 dBe at 50 GHz and < 1.3 dBe at 67 GHz. Relative frequency response uncertainty is typically < 0.5 dBe at 50 GHz and < 1.3 dBe at 67 GHz. Noise floor performance achieves typically < -59 dB (W/A) at 67 GHz for electro-optical measurements and < -55 dB (A/W) at 67 GHz for optical-to-electrical measurements.
Optical operation spans 1290 nm to 1610 nm, with output wavelength options at 1310 nm ± 20 nm or 1550 nm ± 20 nm. Maximum linear average input power is +4 dBm at 1310 nm and +5 dBm at 1550 nm for Optical Input 1, and +14 dBm at 1310 nm and +15 dBm at 1550 nm for Optical Input 2. Maximum safe average input power reaches +7 dBm for Optical Input 1 and +17 dBm for Optical Input 2, with damage level at +20 dBm. Optical return loss exceeds 25 dBo. Average output power ranges from -1 dBm to +5 dBm at 1550 nm and -2 dBm to +4 dBm at 1310 nm, with typical uncertainty of ± 0.5 dBo and stability of ± 0.5 dBo over 15 minutes.
– Key Features
• Electro-optical S-parameter measurements with focus on S21 transfer function accuracy
• Group delay characterization versus frequency
• Insertion loss and transmission bandwidth analysis
• Dual optical input ports with distinct power handling
• Electrical ports rated to +15 dBm RF and 7 V DC maximum safe input
• Electronic calibration module compatibility (Keysight N4694A)
– Typical Applications
• High-speed modulator and detector characterization
• Integrated receiver validation
• Laser performance assessment
• Modulation format optimization for advanced data rates
– Compatibility & Integration
Compatible with N5224A, N5225A, and N5227A network analyzer options. Electronic Calibration Modules recommended for optimal measurement performance.
