Ultrahigh-bit-rate soliton communication systems using dispersion-decreasing fibers and parametric amplifiers

We study analytically and numerically soliton communication links made by use of dispersion-decreasing fibers and parametric amplif iers. We show that bit rates greater than 100 Gbits/s (one channel, one polarization) can be achieved with large amplif ier spacings (as high as 120 km). The Raman effect and soliton interactions are compensated through optical phase conjugation, whereas fiber losses and third-order dispersion are handled through tailoring of the dispersion profile of a dispersion-decreasing fiber.