Bristol Instruments 438 Series Wavelength Meter - WDM

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.

The 438 Series Multi-Wavelength Meter measures wavelength and power of up to 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 438 system automatically calculates OSNR to greater than 40 dB.

Two versions of the 438 Multi-Wavelength Meter are available. The model 438A is the most accurate, measuring wavelength to ± 0.3 pm. For less exacting test requirements, the model 438B is a lower-priced alternative with a wavelength accuracy of ± 1.0 pm. The wavelength accuracy of the 438 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 438A 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 438B.The result is a confidence level of ≥ 99.7% using a coverage factor of three (3σ). To verify this performance, every 438 system is rigorously tested with laser sources that are traceable to NIST standards.

The 438 Multi-Wavelength Meter, with a measurement rate of 10 Hz, is the fastest available. This speed results in reduced testing times enabling greater efficiency in the production of tunable transmitter lasers and optical subsystems.

Data Sheet


This product is manufactured by Bristol Instruments.

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