428 Series Multi-Wavelength Meter

Simultaneous wavelength, power and OSNR measurement

The 428 Multi-Wavelength Meter combines proven Michelson interferometer-based technology with fast Fourier transform analysis in order to measure wavelength, power and OSNR of as many as 1000 discrete optical signals. Wavelength is measured to an accuracy as high as ± 0.3 pm and power is measured to an accuracy of ± 0.5 dB. In addition, the 428 system automatically calculates OSNR to greater than 40 dB.  


Continuous calibration for the most reliable accuracy

Two versions of the 428 Multi-Wavelength Meter are available. The model 428A is the most accurate, measuring wavelength to ± 0.3 pm. For less exacting test requirements, the model 428B is a lower-priced alternative with a wavelength accuracy of ± 1.0 pm. The wavelength accuracy of the 428 system is maintained over long periods of time because it is continuously calibrated with a built-in HeNe laser wavelength standard. In order to achieve the highest accuracy, the model 428A uses a single-frequency HeNe laser that is stabilized using a precise balanced longitudinal mode technique. A standard HeNe laser is used as the wavelength reference in the model 428B.  The result is a measurement confidence level of ≥ 99.7%. To verify this performance, every 428 system is rigorously tested with laser sources that are traceable to NIST standards.  


Designed for productivity and convenience

Operation of the 428 Multi-Wavelength Meter is straightforward. The optical signal enters the model 428 through an FC (PC or APC) fiber-optic connector on the front panel. The system’s high sensitivity results in an input power requirement of only -40 dBm  (0.1 µW). Automatic electronic gain control instantly adjusts the photodetector signal for optimum performance. The controls of the 428 system are user-friendly and conveniently located on the front panel along with the measurement display. The wavelength, power, and OSNR data can be reported in a variety of formats. Data from a specific optical channel can be displayed, or lists of data from all channels, sorted by wavelength or power, can be displayed. The measurement information can also be sent to a PC using a standard USB or Ethernet interface, or an optional GPIB interface. Finally, the 428 system is packaged in a rugged chassis (bench top or rack-mounted) for use in typical laboratory or manufacturing environments.

Test your WDM signals with the confidence that results from reliable accuracy. 

  • Simultaneously measures wavelength and power of up to 1000 discrete optical signals
  • Wavelength measured to an accuracy as high as ± 0.3 pm
  • Continuous calibration with a built-in wavelength standard
  • Measurement confidence level ≥ 99.7%
  • Traceable to NIST standards
  • Power measured to an accuracy of ± 0.5 dB
  • Automatically calculates OSNR to > 40 dB
  • Operates with CW and modulated signals
  • Rugged design for manufacturing environments