Recovery of the soliton self-frequency shift by optical phase conjugation

Adaptive control of femtosecond soliton self-frequency shift in fibers

The Raman shift of a subpicosecond soliton in 100 m of fiber is controlled adaptively by pulse shaping before launching into the fiber. We use a deformable-mirror-based shaper to control the spectral phase of the input pulse.

Dispersion and nonlinearity compensation by spectral phase conjugation

We propose the use of spectral phase conjugation to compensate for dispersion of all orders, self-phase modulation, and self-steepening of an optical pulse in a fiber. Although this method cannot compensate for loss and intrapulse Raman scattering, it is superior to the previously suggested midway temporal phase conjugation method if high-order dispersion is a main source of distortion. The reshaping performance of our proposed scheme and a combined temporal and spectral phase conjugation scheme in the presence of uncompensated effects is studied numerically.

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.

Periodic amplification and conjugation of optical solitons

Nondegenerate optical parametric amplifiers can be used to simultaneously phase conjugate and amplify a pulse in a nonlinear optical fiber. The gain in the amplifiers compensates the linear loss in the fiber, while the phase conjugation effectively neutralizes second-order dispersion, self-phase modulation, the Raman self-frequency shift, and Gordon-Haus jitter. If the remaining third-order and nonlinear dispersions balance, solitonlike pulses are able to propagate with subpicosecond pulse widths.