Transmission of 400G Dual-Carrier DP-16QAM and Multi-Carrier DP-QPSK Signals over Regional and Long- Haul Distances with Span Lengths Greater than 200 km

Abstract

We demonstrate transmission of 400-Gb/s Nyquist-rate dual-carrier DP-16QAM and multi-carrier DP-QPSK signals with 37.5-GHz carrier spacing. The transmission system with span length greater than 200-km SSMF with 44-dB loss and standard EDFA/RA amplification is employed.

An Experimental Comparison of Coded Modulation Strategies for 100 Gb/s Transceivers

“…The combination of a nonbinary (NB) modulation format and FEC is known as coded codulation (CM) [1]. Most current 100G transceivers use quadrature phase shift keying (QPSK) but future 400G transceivers are expected to employ CM based on 16-quadrature amplitude modulation (QAM) [2], [3]. Using higher order modulation formats is also a topic of current research, both in point-to-point links [4]- [6] and in the context of optical networks [7]- [10].…”

Influence of the nonlinear propagation effect on the optical signal-to-noise ratio of 400G optical fiber communication systems

“…At present, there is no common standard for the modulation formats of 400G systems. Four-carrier QPSK (four-QPSK), dual-carrier 16QAM (dual-16QAM), and singlecarrier 16QAM (single-16QAM) [19][20][21] are three of the most possible strategies for 400G system in the next generation of commercial optical fiber communication systems. There are a lot of experimental investigations about the performance of 400G systems [10][11][12][13][14][15][16][17][18][19][20][21][22][23] ; however, few works think about how noises influence 400G signals, especially, and few works have compared the noises of 400G systems with different modulation formats.…”