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We provide an optical heterodyne detection configuration based on an all-fiber acousto-optic structure, which acts as both frequency shifter and coupler simultaneously, with a resolution of 0.01 nm from 10 kHz to 90 kHz.
An all-fiber tunable ring laser consisted of an acousto-optic tunable notch filter and a tapered fiber was demonstrated with a tunable wavelength range from 1532.1 nm to 1570.4 nm and a linewidth of 0.2 nm.
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