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Third order cascaded Raman shifting is used to generate light to 1867 nm in sulfide fibers, and the nonlinearity is measured to be ~5.7 times 10-12 (m/W). Damage at ~1 GW/cm2 limits the wavelength shift range.
We present experimental data comparing RZ versus NRZ pulse shapes for optical duobinary modulation at 10 Gb/s. The NRZ pulse shape is found to be superior for duobinary systems dominated by ASE noise and/or dispersion.
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