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- W2157122346 abstract "An electro-optic wavelength demultiplexer using photorefractive orthogonally polarized four-wave mixing with writing by ordinary rays and readout by extraordinary rays is proposed. The demultiplexing characteristics based on the phase-matching properties are theoretically studied. A refractive index grating is induced within a photorefractive crystal by optical interference of the wavelength-multiplexed signal and the forward pump light with the same channel wavelengths. An external electric field is applied to the crystal in such a way that the phase match condition (Bragg condition) is satisfied for the diffracted light of the backward pump by means of the refractive index grating. As a result, the desired channel signal can be converted to a diffracted signal for demultiplexing by scanning of the external electric field and of the input and output angles of the forward pump and the diffracted signal. As a specific crystal, BaTiO3 is considered. Numerical calculations are used to investigate the demultiplexing characteristics when the signal light is incident normally on the crystal surface. It is found that demultiplexing by spatial separation with a sufficient crosstalk level is achievable with wavelength spacings up to about 0.2 nm, near the wavelength of 0.5145 µm for a crystal size of 4 mm × 4 mm. Since the external electric field is applied only in the direction affecting the refractive index of the read-out signal, the formed refractive index grating is not disturbed and high-speed response is possible. © 2005 Wiley Periodicals, Inc. Electron Comm Jpn Pt 2, 88(10): 19–27, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecjb.20177" @default.
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- W2157122346 date "2005-01-01" @default.
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- W2157122346 title "Electro-optic wavelength demultiplexing using phase-matching property of photorefractive orthogonal polarized pump four-wave mixing in BaTiO3" @default.
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- W2157122346 doi "https://doi.org/10.1002/ecjb.20177" @default.
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