112 Gb/s DP-QPSK coherent optical transmission over 3000 km using an complete set of digital signal processing algorithms

Performance of grey‐coded IQM‐based optical modulation formats on high‐speed long‐haul optical communication link

“…Rosa et al . investigated the impact of OSNR and optical filtering using a complete DSP set of algorithms to recover 112 Gbps DP‐QPSK signal over a 3000 km single mode fibre (SMF) link [17]. Zhou et al .…”

The Gordon—Mollenauer Effect in 112 Gbit/s DP-QPSK Systems

“…To satisfy the increasing demand for data traffic on optical communication systems, the per channel bit rate has increased from 2.5 Gb/s to 40 Gb/s within 10 years, and now 100 Gb/s systems are being deployed. [1,2] In addition to high-speed, high spectral efficiency by employing higher order modulation formats is also an important pursuit in optical communication. Optical phase-modulated systems, due to their high spectral efficiency and increased tolerance to fiber-optic nonlinearities, are promising candidates for the development of ultrahigh-bit-rate transmission links.…”

“…[3] Dual-polarization quaternary phase shift keying (DP-QPSK) has been proposed as the standard modulation format for 112 Gb/s optical systems at present. [1] The Kerr effect as a kind of deterministic nonlinear effect is the main source of impairment in very highbit-rate transmission systems. [4−6] In addition to the deterministic nonlinearities, phase modulated systems also suffer from nonlinear phase noise, called Gordon-Mollenauer (G-M) noise, [7] which is caused by the nonlinear interplay between the signal and the amplified spontaneous emission (ASE) emitted by the inline amplifiers.…”