Abstract
Rare-earth doped fibers, and in particular Er-doped fibers (EDFs), are demonstrated as promising substitutes of photorefractive crystals in adaptive interferometers based on transient two-wave-mixing (TWM) [1]. The dynamic population gratings are recorded in these fibers by local saturation of the optical absorption/gain in the bright fringes of the interference pattern formed by two counter-propagating mutually coherent recording waves [2]. When one of the waves is phase modulated, the TWM signal is observed as an intensity modulation in the output waves. For the recording wavelength close to the maximum of fundamental absorption of EDF (∼ 1532 nm), the transient TWM response depends quadratically on the modulation amplitude, which corresponds to the unshifted absorption grating recorded in the saturable doped fiber.
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