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

Abstract

We demonstrate experimentally a simultaneous threefold modal and wavelength conversion process of a 10-Gbit/s On/Off keying signal in a 1.8-km long graded-index 6-LPmode fiber. The principle of operation is based on a phase-matched inter-modal four-wave mixing phenomenon occurring between the fundamental mode and 3 higher-order modes of the fiber. The converted signals show well-opened eye-diagrams and error-free processing.

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].…”

“…The effective areas (A eff ) of each mode around 1550 nm for both fibers are listed in table 1. The dispersion curves of each spatial mode have been measured by the time-of-flight method and shown in figures 2(b) and (c) for the bimodal fiber and 6-LP-mode fiber, respectively [12]. The measured chromatic dispersion (D) together with the calculated effective coupling areas (A cross ) between the fundamental mode and each higher-order mode, are also listed in table 1.…”

“…To get a better description of both the intra-modal MFWM and the inter-modal XPM effects in the few-mode fiber, we use a system of two-mode coupled NLS to simulate the nonlinear interactions between a high-power beat-signal propagating in the fundamental mode and a weak CW probe injected into a higher-order mode of the FMF. The simplified scalar NLS neglecting the higher-order (third-order and higher) dispersion terms and also the Raman effect is employed as [12]:…”

“…Stimulated by the continuously increasing data traffic in optical networks and the compelling demand to prevent a 'capacity crunch' in the next decades, space-division multiplexing (SDM) in multimode fibers has emerged as a breakthrough technology for modern optical communications [1][2][3][4][5]. The development of SDM and associated multimode components and fibers open a new avenue for all-optical processing of spatially multiplexed signals, thus placing the nonlinear optics on the multimode platform back to the frontier of contemporary researches, among which the inter-modal nonlinear interactions in multimode fibers is an intensively investigated field of research [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. On the other hand, the generation of picosecond pulse trains at high repetition rates is highly demanding in numerous applications including optical communications, optical sampling, component characterization, clock generation, metrology or spectroscopy.…”

Roadmap on multimode photonics

“…In a relatively low pump power regime, the FWM interactions can be exploited for all-optical MM signal processing-e.g. ultrafast amplification or wavelength conversion (figures 10(a)-(c))-that may become a cornerstone of the envisaged SDM platform [93]. When the pump power increases, the interplay among FWM and other processes (e.g.…”