Experimental verification of the pulse shepherding concept in dispersion-shifted single-mode fiber for bit-parallel wavelength links

Multichannel soliton transmission and pulse shepherding in bit-parallel-wavelength optical fiber links

“…However, in a bit-parallel transmission scheme it enables for a strong "shepherding" pulse to trap and constrain a sequence of copropagating weaker pulses to their required time slot. Experimentally, the reduction of the misalignment due to the group-velocity mismatch of two pulses in the presence of the shepherding pulse has been observed in a dispersion-shifted Corning fiber [4], [5].…”

“…To describe the simultaneous transmission of pulses of different wavelengths in a single-mode optical fiber in the absence of the four-wave mixing (FWM), we follow the standard derivation [6], [7], and obtain a system of incoherently coupled NLS equations in the coordinate system moving with the group velocity of the central pulse (1) where For a th pulse, is the slowly varying envelope measured in the units of , where is the incident power carried by the central pulse, is the normalized group velocity dispersion, is the relative group velocity mismatch, and characterizes the nonlinearity strength . The time and propagation distance are measured in units of characteristic pulsewidth ps, and dispersion length km [3], [4], [5]. For the operating wavelengths spaced 4-5 nm apart (to avoid the FWM effect), within the band 1530-1560 nm (see [3], [4], [5]), the coefficients and are different but close to one.…”

“…The time and propagation distance are measured in units of characteristic pulsewidth ps, and dispersion length km [3], [4], [5]. For the operating wavelengths spaced 4-5 nm apart (to avoid the FWM effect), within the band 1530-1560 nm (see [3], [4], [5]), the coefficients and are different but close to one. For the realistic group-velocity difference of less than 5 ps/km [4], [5], the mismatch parameter 25.…”

“…For the operating wavelengths spaced 4-5 nm apart (to avoid the FWM effect), within the band 1530-1560 nm (see [3], [4], [5]), the coefficients and are different but close to one. For the realistic group-velocity difference of less than 5 ps/km [4], [5], the mismatch parameter 25. In our analysis, we restrict ourselves to small values of the walkoff parameter, 5, corresponding to the group-velocity difference of 1 ps/km.…”

“…The values of the modal parameters in Fig. 3 are chosen to provide a clear bifurcation picture, although they correspond to the wavelength spacing that is much larger than the one used in the experiments [4], [5], for which . If the modal parameters are tuned closer to each other, the first two links of the bifurcation cascade tend to disappear.…”