Uncommon wavelengths for optical power meter testing

Beyond standard telecom wavelengths, uncommon optical power meter testing wavelengths include 670, 780, 980, 1270, 1577, 1623, and 1650 nm, often used for specialized calibration or non-telecom applications.Standard vs. Uncommon WavelengthsMost optical power meters are calibrated for telecom wavelengths: 850 nm, 1300 nm, and 1550 nm, which cover multimode and single-mode fiber systems . These are the most common for fiber optic communications. However, certain applications require testing at less common wavelengths, either for device-specific calibration or for non-standard fiber systems.Examples of Uncommon Wavelengths670 nm: Used in compact-disc players and some plastic fiber systems .780 nm: Often applied in early optical storage or specialized fiber applications .980 nm: Relevant for erbium-doped fiber amplifier (EDFA) pump lasers and certain test setups .1270 nm: Occasionally used in wavelength-division multiplexing (WDM) systems or specialized testing .1577 nm, 1623 nm, 1650 nm: Extended wavelengths for high-precision testing, WDM systems, or high-power fiber applications .Detector ConsiderationsThe choice of wavelength is closely tied to the detector type:Silicon (Si) detectors: Sensitive from ~400 to 1100 nm, suitable for 670, 780, and 850 nm testing .Germanium (Ge) detectors: Sensitive from 800 to 1800 nm, covering 980, 1300, and 1550 nm, but with higher noise at low power levels .Indium Gallium Arsenide (InGaAs) detectors: Optimal for 1000–1650 nm, ideal for 1270, 1490, 1550, 1577, 1623, and 1650 nm measurements .Calibration and AccuracyUncommon wavelengths require careful calibration because detector responsivity varies with wavelength. NIST and other calibration labs provide services for these wavelengths to ensure accurate absolute power measurements . When testing at uncommon wavelengths, it is important to:Use the same fiber and connector type as in the measurement setup.Verify spectral responsivity of the detector.Consider potential reflection effects that can artificially increase readings .Practical ApplicationsTesting at uncommon wavelengths is often necessary for:Specialized fiber optic devices (e.g., EDFAs, plastic fibers, or optical storage systems).Extended WDM systems requiring precise calibration across multiple channels.High-power fiber applications where standard telecom wavelengths do not cover the operational spectrum. By selecting the appropriate wavelength and detector type, optical power meters can provide accurate measurements even outside the standard telecom range, ensuring reliable testing for specialized applications .

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Uncommon wavelengths for optical power meter testing