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Bristol 438 Optical Wavelength Meter

Home Products Laser Accessories Laser Diagnostics Bristol 438 Optical Wavelength Meter

Bristol 438 Optical Wavelength Meter

The fastest multi-wavelength meter available for WDM testing applications

Bristol Instruments

The 438 Series Multi-Wavelength Meter combines proven Michelson interferometer-based technology with fast Fourier transform analysis in order to measure the wavelength, power and OSNR of as many as 1000 discrete optical signals. With features such as high accuracy, fast measurement rate, straightforward operation, and rugged design, the model 438 provides the most precise, reliable and efficient WDM wavelength testing to satisfy the needs of any manufacturing engineer.


  • Simultaneously measures wavelength and power of up to 1000 discrete optical signals
  • Optical wavelength measured to an accuracy as high as +/-0.3pm
  • Continuous calibration with a built-in wavelength standard
  • Measurement confidence level of > 99.7%
  • Traceable to NIST standards
  • Power measured to an accuracy of ± 0.5dB
  • Automatically calculates OSNR to >40dB
  • Operation from 1000 to 1680nm covers the important C, L, T and O optical bands
  • Fastest measreuemtn rate of 10Hz for reduced testing times
  • High sensitivity of -40dBm (1.0W) with automatic electronic gain control
  • Operates with CW and modulated signals
  • Convenient touch-screen display reports measurement data in a variety of formats
  • Interfacing via SCPI using USB, Ethernet or GPIB
  • Rugged design for manufacturing environments

Download the datasheet or contact us for more information.


438 datasheet                                                        Read more on Bristol's website