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Optical spectrum analysis and polarization analysis are not generally related by conventional wisdom. In this paper, we show that the spectrum of a light beam can be obtained using a polarimeter, with a resolution and a speed that cannot be achieved with traditional spectrum analysis methods. We experimentally demonstrate a novel polarimeterbased optical spectrum analyzer (P-OSA) and show that the high-speed and high-resolution nature of the device enables rapid measurement of the spectrum ofdoi:10.1364/oe.16.017854 pmid:18958067 fatcat:rxjc6e5percq3pfu765eigmfo4