Measurement of spectral lines produced by four-wave mixing in 30 km dispersion-shifted single-mode optical fiber

摘要

Interaction between two copropagating narrowband light waves in a monomode optical fiber can occur because of four-wave mixing phenomena. Light beams from two lasers, a tunable external cavity laser and a distributed feedback semiconductor laser with wavelength separation around 0.36 nm (45 GHz) at lambda=1.545 mum, are first amplified by an erbium-doped amplifier and then launched into a 30 km dispersion-shifted fiber. The fiber acts as a nonlinear medium to mix two optical waves and generates one, two, three, and even four optical waves (sidebands) at other wavelengths. An optical spectrum analyzer with a resolution of 0.1 nm has been used to measure the power of the output sidebands. In good agreement with theory, by raising the power of input signals, the number of output sidebands and their powers is also increased. (C) 2002 American Institute of Physics. References: 20