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In this paper, fibers and transmission system designs using nonlinear optical amplification and frequency conversion in single -mode fibers(SMF) are discussed. Optical amplification of signals issued from laser diodes in the first and second optical transmission windows is reported. Raman gains of 40 dB have been obtained for 1.32 µm laser diode light at the rate of 11 dB/W in a 2.5 km long SMF. Parametric amplification of laser diode signals at 1.57 µm in a 30 m long SMF pumped in the low dispersion region at 1.32 µm is presented. Gain values in excess of 30 dB are measured. Up and down frequency conversions using stimulated four -photon mixing experiments are also demonstrated.

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A tunable IR laser source is described. A Q-switched Nd:YAG laser at 1.064 µm is used to pump two optical parametric oscillators (OPO's) in series. The first OPO uses a LiNbO(3) crystal and works in the vicinity of degeneracy. Its signal beam (adjusted to 1.82 µm) is used to pump the second OPO, which uses a AgGaSe(2) crystal and covers the range 2.6-6 µm. The conversion efficiency between the energy produced by this OPO in the signal and idler beams (λ(s) = 2.6 µm and λ(i) = 6 µm, respectively) and the input energy at 1.064 µm is 1.75%.

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