Testing with LED Sources

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Testing with LEDs necessitates in-depth knowledge of their physical properties in order to cope with measurement uncertainties, especially when finer spectral resolution is required. By looking at the change in central wavelength with applied current, the long-term spectrum stability for different resolution bandwidths, and some qualitative measurement of the degree of polarization of LEDs over narrower spectral windows, we hope to provide helpful insight into LED testing. To illustrate these various elements, we will use EXFO's FLS-2200 Broadband Source.