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N4375D 26.5 GHz Single-Mode Lightwave Component Analyzer

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Typically Configured Price US$ 251,089

Typical Configuration

N4375D Lightwave Component Analyzer, single mode

  • N4375D-102 Optical Test Set with 1310 nm and 1550 nm Source
  • N4375D-220 26.5 GHz, 2 Port PNA (N5222A-200) with RF-Cables
  • N4375D-022 Angled FC/APC SM
  • N4375D-050 External Optical Input
  • R-51B-001-C Return to Keysight Warranty - 1 year

Typically Configured Price US$ 251,089


Prices for: United States

* Prices are subject to change without notice. Prices shown are Manufacturer's Suggested Retail Prices (MSRP). Prices shown are exclusive of taxes.

Key Features & Specifications

Absolute responsivity accuracy at 26.5 GHz

  • ± 1.8 dBe, 1.5 dBe (typical) at 1550 nm
  • ± 2.2 dBe, 1.5 dBe (typical) at 1310 nm

Relative responsivity accuracy at 26.5 GHz

  • ± 0.8 dBe, ± 0.5 dBe (typical)

Noise floor at 26.5 GHz

  • < -86 dB (W/A) for E/O measurements
  • < -76 dB (A/W) for O/E measurements

Transmitter wavelength

  • (1310 ±20) nm
  • (1550 ±20) nm


The new N4375D single-Mode LCA is based on the latest 5222A series network analyzers with 2-port or 4-port configuration. This LCA is the ideal measurement solution for electro-optical components up 26.5GHz electro-optical components, as well as Radio over Fiber (RoF) and aerospace and defense (A&D) electro-optical test applications.

The N4375D is traceable to international standards and provides guaranteed specifications for electro-optical responsively S-parameter measurements in a turn-key solution. In combination with N4691B electronic calibration kit you get fastest setup of your test, so you can focus on developing your components.

The new N4375D replaces the industry standard 8703A/B series and supports specified modulation frequencies up to 26.5 GHz at 1310nm and 1550nm source wavelength or individual wavelength with external optical input.


  • Highly repeatable and accurate measurements show more details of S21 characteristics due to low noise on trace.
  • Traceability to international standards ensures comparable measurement results independent of the individual instrument.
  • Low cost of ownership supported by easy and fast calibration and measurement.


  • NIST traceable relative frequency responsivity specification
  • External optical source input for test at all wavelength between 1300 and 1600 nm
  • Guaranteed responsivity specification now up to 26.5 GHz. Fast and accurate calibration with electrical calibration module 
  • Extended calibration support for advanced test setup
  •  Built-in optical power meter
  • User-selectable transmitter power
  • SCPI remote control