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19 May 2009 Ultrafast depolarization based on four-wave mixing in highly nonlinear optical fiber
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Abstract
We present an ultrafast depolarizer based on four-wave mixing (FWM) in highly nonlinear optical fiber (HNLF), in which a completely polarized laser beam with any fixed state of polarization (SOP) mixed with an unpolarized pump can be instantaneously converted into an unpolarized idler wave. The degree-of-polarization (DOP) of the idler wave is experimentally measured to be 0.33 when the DOPs of the polarized signal and unpolarized pump are 0.986 and 0.036, respectively. We analyze the beam couplings between a polarized beam and a completely unpolarized pump in the ultrafast depolarizer by using vector FWM theory. The nonzero DOP of the idler wave ascribes to the polarization dependence of the FWM conversion efficiency. The speed of the depolarizer is determined by the intrinsic nonlinear response of silica, which could be just a few femtoseconds.
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Yu Tian, Peng Dong, Xiaosheng Xiao, and Changxi Yang "Ultrafast depolarization based on four-wave mixing in highly nonlinear optical fiber", Proc. SPIE 7354, Nonlinear Optics and Applications III, 73540X (19 May 2009); doi: 10.1117/12.819386; https://doi.org/10.1117/12.819386
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