Bandwidth enhancement of inter-modal four wave mixing Bragg scattering by means of dispersion engineering

Abstract

We report on the design, fabrication, and experimental characterization of germanium-doped graded-index multi-mode fibers that are tailored to achieve broadband operation for the intermodal Bragg scattering four wave mixing process. First, we show that increasing the core diameter decreases the separation between the pumps and the signal/idler pair. Second, we demonstrate a conversion efficiency bandwidth (7 nm) of more than twice that achieved previously with half the fiber length (50 m).

Spatially multiplexed picosecond pulse-train generations through simultaneous intra-modal four wave mixing and inter-modal cross-phase modulation

“…The output temporal profiles are broadened and tilted when the input signal wavelength is unphase-matched with the central wavelength of the beating. Once again, these results underline the high sensitivity of the inter-modal nonlinear interactions in FMFs with respect to the phase matching conditions, as already highlighted in several previous works [7][8][9][10][11][12] and which could be seen as a strong limitation for practical applications without a specific fiber design [46][47][48].…”

Multiple modal and wavelength conversion process of a 10-Gbit/s signal in a 6-LP-mode fiber

“…Linear coupling, particularly the random coupling between higher order group of modes and degenerate modes is also found to limit the longterm stability of our system. Further improvements could be achieved, in particular the bandwidth of the process, by means of a specific design of the FMF, with lower chromatic dispersion, smaller effective modal areas and the breaking of degeneracy for higher-order modes by means of elliptical core few-mode fibers [9,24,25]. One additional perspective could be to generalize this concept to a higher number of spatial modes.…”

“…This discrepancy can be also attributed to the neglected small differences for the chromatic dispersions of each mode and high-order dispersion terms which destroys the ideal phase matching conditions at large signal-pump wavelength separations. Moreover, the vectorial nature of the propagation, especially the polarization mode dispersion effect is not taken into account in our model, which is known to severely reduce the IFWM gain bandwidth [10,24]. More importantly, the impairment of the CE with respect to the number of degenerate modes in the same group is observed particularly relevant in Fig.…”

DSP-Assisted Nonlinear Impairments Tolerant 100 Gbps Optical Backhaul Network for Long-Haul Transmission

“…As fiber transmission impairments are generally associated with the analog transmission over the fiber [ 9 ], the digital modulation also undergoes performance degradation due to the accumulated non-linear effects. Recent research work in this domain include the use of digital Nonlinearity Compensation (NLC) in a fully loaded WDM multiplexed transmission system [ 10 ], the shaping algorithm for mitigating the effect of nonlinear phase noise in fiber optic transmission [ 11 ], the single step nonlinear impairment based on the Gaussian mixture model [ 12 ], and a complex equalizer for a 40 Gbps system to achieve transmission over 240 km optical fiber using a single channel [ 13 ]. However, these mentioned models have complex build up and cost restrictions.…”