The wavelength set for the optical power meter includes

An optical power meter can be set to specific wavelengths, typically ranging from 800 nm to 1700 nm, with standard calibration wavelengths at 850 nm, 1310 nm, and 1550 nm.

Standard Wavelengths and Fiber Types

Optical power meters are calibrated for specific wavelengths, and selecting the correct wavelength is critical for accurate measurements . The most commonly used wavelengths are:

• 850 nm – used for multimode fiber in LANs and short-distance applications .
• 1310 nm – used for both multimode and single-mode fiber testing .
• 1550 nm – primarily for single-mode fiber in long-distance telecom networks .

Using the wrong wavelength can produce inaccurate readings because the meter's detector sensitivity varies with wavelength .

Supported Wavelength Range

Most optical power meters support a broad wavelength range, typically 800 nm to 1700 nm, allowing flexibility for different fiber optic applications . Some advanced meters, like the Tempo OPM510 and OPM520, support multiple discrete wavelengths including 850, 980, 1270, 1300, 1310, 1490, 1550, 1577, 1623, and 1650 nm .

Practical Considerations

• Match the meter to the light source: Always set the meter to the same wavelength as the source to ensure accurate power readings .
• Detector type: Optical power meters use detectors such as Si, Ge, or InGaAs, which have different sensitivities across wavelengths .
• Calibration: For precise measurements, calibrate the meter at the wavelength of the device under test .
• Multimode vs. single-mode fiber: Multimode fiber is typically tested at 850 nm and 1300 nm, while single-mode fiber is tested at 1310 nm and 1550 nm .

By selecting the correct wavelength and ensuring proper calibration, optical power meters provide reliable measurements for both absolute and relative optical power in fiber optic networks .