Experimental demonstration of nonlinear frequency division multiplexed transmission

Abstract

We experimentally demonstrate an NFDM optical system with modulation over nonlinear discrete spectrum. Particularly, each symbol carries 4-bits from multiplexing two eigenvalues modulated by QPSK constellation. We show a low error performance using NFT detection with 4Gbps rate over 640km.

Nonlinear Inverse Synthesis for Optical Links With Distributed Raman Amplification

“…There are two main directions in the NFT communications methodology, which can be categorized according to what part of the nonlinear spectrum (solitonic discrete part or continuous part) is used for the modulation and transmission. In particular, [19][20][21][22][23] studied the discrete (solitonic) components of the nonlinear spectrum for data communications. This approach is often referred as nonlinear frequency division multiplexing (NFDM) and some initial experimental demonstrations have been reported recently [21][22][23].…”

“…In particular, [19][20][21][22][23] studied the discrete (solitonic) components of the nonlinear spectrum for data communications. This approach is often referred as nonlinear frequency division multiplexing (NFDM) and some initial experimental demonstrations have been reported recently [21][22][23]. However, the NFDM method requires considerable optimization of the pulse shapes for the purpose of maximizing the resulting spectral efficiency (SE) [24].…”

First Experimental Demonstration of Nonlinear Inverse Synthesis Transmission over Transoceanic Distances

“…As a result, the nonlinearity-induced cross-talk between them is effectively absent during propagation [1]. Recently, initial experimental demonstrations of NFT-based systems with the use of discrete spectrum have been reported [5,6]. However, the number of transmitted bits per burst and distance reach were limited to 4 bits/burst over 640 km in [5] and 3 bits/burst over 1800 km in [6], respectively.…”

“…Recently, initial experimental demonstrations of NFT-based systems with the use of discrete spectrum have been reported [5,6]. However, the number of transmitted bits per burst and distance reach were limited to 4 bits/burst over 640 km in [5] and 3 bits/burst over 1800 km in [6], respectively. One of the key challenges for NFT-based communication is to develop new effective techniques to encode and detect information to/from the signal's nonlinear spectrum.…”

“…In this paper, we report a significant improvement in NFT-based system performance by experimentally demonstrating for the first time, the generation, transmission and detection of a 10Gbaud NFT-based signal (120 bits/burst) over a distance of 7344 km. This represents a factor of 12 improvement in data capacity x distance product compared with other NFT-based systems [5,6]. In this experiment, information is encoded directly onto the continuous part of the signal's nonlinear spectrum using QPSK OFDM waveform via inverse NFT (INFT) and the nonlinear inverse synthesis (NIS) transmission scheme [4, 7 -9] …”