Commercial 100-Gbit/s Coherent Transmission Systems

Estimation of the OSNR Penalty Due to In-Band Crosstalk on the Performance of Virtual Carrier-Assisted Metropolitan OFDM Systems

“…Nowadays, the coherent detection is the chosen detection scheme in the transport networks, thereby, the quadrature phase-shift keying (QPSK) has became the modulation most used in these networks. In fact, the coherent detection allows the transmission of M -ary quadrature amplitude modulation (QAM), hence, the coherent detection allows the coexistence of a large variety of different modulation formats and bit rates in the optical networks [29]. This fact makes the study of the in-band crosstalk an even more relevant topic in the optical communication research, as the coherent detection enables crosstalk signals with different characteristics, such as, different modulation format order, symbol rate or bit rate, hence, leading to different impacts on the receiver performance.…”

Satellite Quantum Communication via the Alphasat Laser Communication Terminal - Quantum Signals from 36 thousand kilometers above Earth

“…The backbone of today's data communication is provided by optical fiber systems based on coherent communication [1]. Using the homodyne principle, known from radio communication, the signal is mixed with a local oscillator in order to filter out the background and detect small signals.…”

100 Gb s−1coherent dense wavelength division multiplexing system reach extension beyond the limit of electronic dispersion compensation using optical dispersion management

“…Moreover, the total uncompensated chromatic dispersion in DP-QPSK systems with electronic dispersion compensation reduces nonlinear penalty, thus making optical dispersion compensation not only unnecessary but harmful [6,7,[10][11][12][13][14]. It should be noted that virtually any amount of CD can be compensated electronically, while in practice transponders are designed to compensate a fixed amount of CD required for the large majority of transmission systems, typically 70 ns nm −1 or approximately 4000 km of standard single mode fiber (SSMF) [6,7,15,16]. However, in certain geographic regions systems with longer length and therefore higher total chromatic dispersion are required e.g.…”