Optical coherent broad-band transmission for long-haul and distribution systems using subcarrier multiplexing

Performance limits in optical communications due to fiber nonlinearity

“…This gives ready access to two orthogonal field quadratures and both polarizations [121][122][123], allowing the data rate to be immediately quadrupled for the same symbol rate and number of amplitude levels. It also allows the possibility of applying signal processing functions which would be difficult in the optical domain, such as spectral filters with sharp roll offs [18,[124][125] and adaptive all pass filters with long memory lengths enabling, for example, electronic compensation of chromatic dispersion [126,127]. A particularly important linear compensation function associated with digital coherent receivers is the compensation of substantial levels of polarization mode dispersion.…”

Commercially deployed coherent system for video distribution

“…However, although a few approaches have been proposed [6][7][8] to meet the other requirements (1)-(4), they are not seen as definitive solutions from the viewpoint of deployment in the FTTH network.…”

<title>Pulse-time modulation for subcarrier-multiplexed systems</title>

“…The The majority of SCM systems proposed to date employ IM/DD due to its low cost and simplicity. Coherent optical techniques can be applied in SCM systems [19,40] providing increased receiver sensitivity, link lengths and a large number of users through dense wavelength division multiplexing (WDM). Against these advantages must be weighed the complexity and cost inherent in coherent systems.…”