Few Mode Transmission Fiber with low DGD, low Mode Coupling and low Loss

Abstract

Transmission of a 73.7 Tb/s (96x3x256-Gb/s) DP-16QAM mode-division-multiplexed signal over 119km of few-mode fiber transmission line incorporating an inline multi mode EDFA and a phase plate based mode (de-)multiplexer is demonstrated. Data-aided 6x6 MIMO digital signal processing was used to demodulate the signal. The total demonstrated net capacity, taking into account 20% of FEC-overhead and 7.5% additional overhead (Ethernet and training sequences), is 57.6 Tb/s, corresponding to a spectral efficiency of 12 bits/s/Hz. "209-km single-span mode-and wavelength-multiplexed transmission over hybrid few-mode fiber "6x6 MIMO transmission over 50+25+10 km heterogeneous spans of few-mode fiber with inline erbium-doped fiber amplifier, "Mode-division-multiplexed 3x112-Gb/s DP-QPSK transmission over 80 km few-mode fiber with inline MM-EDFA and blind DSP, "73.7 Tb/s (96X3x256-Gb/s) mode-division-multiplexed DP-16QAM transmission with inline "Mode-division multiplexing over 96 km of few-mode fiber using coherent 6 × 6 MIMO processing," J. Lightwave Technol. 30(4), 521-531 (2012). 13. P. Krummrich, "Optical amplifiers for multi mode / multi core transmission

Reach Improvement of Mode Division Multiplexed Systems Using Fiber Splices

“…Considering a fiber step of 200 m, the core displacement distribution parameters have been tuned in order to match the experimental measurements presented in [1], where the accumulated dXT at the end of 33 km was -18 dB. Additionally, MDL arising from the waveguide imperfections and bends is neglected according to the experimental measurements presented in [1], [4].…”

“…The refractive index profile considered to obtain the results in Fig. 1 (and along this letter) is composed by a graded core and a cladding trench, since this profile proved to be capable of guaranteeing arbitrary DMD [4], [8]. The results in Fig.…”

“…Two different configurations are considered to achieve low DMD transmission: ILD-FMFs [4], Fig. 2 a), and DC-FMFs [11], Fig.…”

“…However, given that current experimental FMFs present weak distributed XT (dXT) (reported value of -18 dB after 33 km [1], [4]), the XT accumulated along transmission can be increased using discrete XT, introduced at specific points. In [5] it has been shown that ideal discrete mode permutation, without mode dependent losses (MDL), within the transmission line may effectively increase the maximum distance reach by a factor of 5.…”

Impact of inter-modal four-wave mixing on the performance of mode- and wavelength-division-multiplexing systems

“…However, the guidance of multiple modes introduce impairments absent in SMFs, namely: differential mode delay (DMD) [2], [3], linear mode coupling (XT) [4] and inter-modal (IM) nonlinear (NL) effects [5]- [9]. The IM-NL effects are IM cross-phase modulation (IM-XPM) and IM four-wave mixing (IM-FWM).…”