Abstract
We present a new form of all-fiber frequency shifter based on the use of an all-fiber ring resonator as a high-resolution filter illuminated by a phase-modulated input beam. The configuration offers a frequency-tunable output with complete suppression of the unshifted light component and extremely high suppression of unwanted sidebands. A maximum frequency conversion efficiency of 17% has been measured, with sidebands at -40 dB.
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