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238 Series Optical Wavelength Meter

Reliable accuracy over a broad wavelength range

Wavelength measurement from 700 to 1650 nm

The 238 Series Optical Wavelength Meter from Bristol Instruments is designed for the precise wavelength characterization of tunable transmitter lasers, DFB lasers, and VCSELs used in applications such as fiber-optic communications, data storage, and 3D sensing.

Features such as reliable accuracy, broad wavelength coverage, straightforward operation, and rugged design satisfy the needs of both the R&D scientist and the manufacturing engineer.

Guaranteed accuracy with continuous calibration

The 238 Optical Wavelength Meter uses proven Michelson interferometer-based technology to accurately measure the wavelength of CW lasers.

Two versions are offered. The model 238A is the most precise, providing an accuracy of ± 0.3 pm. For less exacting test requirements, the 238B system is a lower-priced alternative with a wavelength accuracy of ± 1.0 pm.

Continuous calibration with a built-in wavelength standard maintains the performance of the 238 Optical Wavelength Meter over long periods of time. What’s more, every 238 system is rigorously tested with laser sources that are traceable to NIST standards.

Designed for convenience, built to last

Operation of the 238 Optical Wavelength Meter is straightforward.

The optical signal enters the model 238 through an FC (UPC or APC) fiber-optic connector on the front panel. The system’s high sensitivity results in an input power requirement as low as -25 dBm (3 µW). Automatic attenuation instantly adjusts the signal for optimum performance.

A convenient touch-screen display on the instrument's front panel controls the 238 system and reports the measured wavelength and power. The measurement data can also be sent to a PC using a library of SCPI commands via standard USB or Ethernet interface, or an optional GPIB interface.

The rugged design of the 238 Optical Wavelength Meter provides long-term reliable operation that is backed by a five-year warranty covering all parts and labor.

  • Wavelength accuracy as high as ± 0.3 pm
  • Continuous calibration with built-in wavelength standard
  • Measurement confidence level ≥ 99.7%
  • Traceable to NIST standards
  • Power measured to an accuracy of ± 0.5 dB
  • Broad operational range of 700 to 1650 nm
  • Measurement rate of 15 Hz
  • 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
  • 5-year warranty covers all parts and labor