An Optical Spectrum Analyzer (OSA) is an instrument used to measure the power of an optical signal as a function of wavelength or frequency. It is essentially a spectrometer designed to work in the optical domain (typically UV, Visible, and IR wavelengths). OSAs are commonly used to characterize the spectral content of light sources like lasers and LEDs, and to analyze optical signals in fiber optic communication systems, ensuring proper wavelength and power distribution.
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