Effect of decision feedback equalizer taps on 3×6- channel mode-wavelength division multiplexing system performance in multimode fiber

Abstract

Abstract. In this paper, the effect of tap configurations in a decision feedback equalizer is investigated for controlling modal dispersion in a 60Gb/s 18-channel mode division multiplexing -wavelength division multiplexing system in a 2.5km multimode fiber on three Laguerre-Gaussian modes and six wavelengths centered at 1550nm. Spectrum analyser diagrams and bit error rate measurements show satisfactory performance for feed forward -feedback tap combinations (10,5), (14,0), (15,6) and (15,10) by effectively suppressing higher order modes.

Radio-over-free space optical space division multiplexing system using 3-core photonic crystal fiber mode group multiplexers

“…Nevertheless, the main challenge for Ro-FSO systems is the performance degradation due to low visibility and turbulence, as optical are not capable of penetrating structures and other obstacles [9,10,21,22]. Space division multiplexing (SDM) is a recent spatial diversity strategy transpired by utilizing different eigenmodes in optical fiber as independent channels to create multiple-input-multiple-output systems [22][23][24][25][26][27]. SDM enables the provision of multiple links during harsh weather conditions in case of failure of any of the links and increases the achievable link distance [28][29][30][31][32][33][34].…”

Design & investigation of 10x10 gbit/s MDM over hybrid FSO link under different weather conditions and fiber to the home

“…In MDM, different modes are used to facilitate the propagation of a various number of modes on different channels generated by various techniques based on optical signal processing [13,14], few-mode fiber [11,15] and modal decomposition methods [16,17] MDM based on switching [18], also multiplexer [12] over optical communication. Moreover, electronic and photonic equalization schemes [19][20][21][22] could possibly be explored and integrated into the system. The other scheme of optimization soft computing algorithm [23][24][25] that can be used in optical communication to improve nonlinearly distortion.…”

International Journal of Electronics and Telecommunications

“…They were implemented to remove the nonlinear ISI that caused by nonlinear operations due to the direct detection and modulation in fiber optic systems. Furthermore, they are considered as a simple and cost-effective solution [20][21][22].…”

“…There are bound to be some irregularities (i.e., ISI) [26] caused by the distortion of signal pulses and modal dispersion. DFE is then used to remove [27] these inter-symbol perturbations optimally [20,21]. These were chosen because the modal power loss becomes minimum at these wavelengths [28].…”