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Efficient FWM Based Broadband Wavelength Conversion Using a Short High-Nonlinearity Fiber
Osamu ASO Shin-ichi ARAI Takeshi YAGI Masateru TADAKUMA Yoshihisa SUZUKI Shu NAMIKI
IEICE TRANSACTIONS on Electronics
Publication Date: 2000/06/25
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Advanced Optical Devices for Next Generation High-Speed Communication Systems and Photonic Networks)
wavelength conversion, optical phase conjugation, WDM, optical network, optical processing,
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Fiber four-wave mixing (FWM) based parametric wavelength conversion experiment is demonstrated. Over 91nm multi-channel simultaneous conversion is achieved. The bandwidth is to our knowledge, the broadest value of the published results. We shall argue that the method to realize the broadband wavelength conversion. Efficiency and/or bandwidth of the wavelength conversion is degraded mainly by the following obstacles, (a) inhomogeneity of the chromatic dispersion distribution along the fiber, (b) mismatch of the states of polarization (SOP) between pump and signals and (c) bandwidth limitation from coherence length. We discuss that an extremely short high-nonlinear fiber should overcome the above three obstacles. Furthermore we comment on the higher-order dispersion and also the influence of the stimulated Brillouin scattering (SBS). High-nonlinearity dispersion-shifted fiber (HNL-DSF) is a promising solution to generate the FWM efficiently in spite of the short length usage. We develop and fabricate HNL-DSF by the vapor-phase axial deposition method. Nonlinear coefficient of the fiber is 13.8 W-1km-1. We measure the conversion efficiency spectra of the four HNL-DSFs with different lengths. Length of each fiber is 24.5 km, 1.2 km, 200 m and 100 m respectively. It is shown that conversion bandwidth increases monotonically as the fiber length decreases. The result apparently proves the advantage of the extremely short fiber.