Experimental investigation of nonlinear noise in long-haul 100-Gb/s DP-QPSK communication systems using real-time DSP

Abstract

Nonlinear noise in 100-Gb/s dual-polarization quadrature phase shift keying transmission has been investigated using a straight-line test bed. The optimal signal power and OSNR margin have been measured in up to 4000 km of G.652-fiber. The results have a good agreement with previously reported models.

Accumulation of nonlinear noise in coherent communication lines without dispersion compensation

“…A master laser of transmitter and a reference laser of receiver are full C-band tunable external cavity lasers (ECL) with approximately 100 kHz width of the emission band. A more detailed description of the transmitter can be found in [22][23][24].…”

500 km unrepeatered 200 Gbit·s−1transmission over a G.652-compliant ultra-low loss fiber only

“…Due to the very low power of Raman ASE noise, we can neglect the depletion of pump radiation, which eliminates the ASE term on the right-hand side of pump rate equation (1).…”

“…However, constructing such unrepeatered links is a highly complicated technical task, especially with regard to the need to constantly increase line capacity and channel data rate. Recently 100 Gb•s −1 channels have been realized using the dual polarization quadrature phase-shift-keying (DP-QPSK) modulation format operating over the 50 GHz wavelength division multiplexing (WDM) grid [1][2][3][4][5][6][7][8].…”

New method to obtain optimum performance for 100Gb/s multi-span fiber optic lines

“…Simple analytical expressions were obtained in a theoretical model based on perturbation theory that proved to be very usable for analysis of fiber optic transmission systems without periodical dispersion compensation [17][18][19][20][21][22][23][24]. In this model nonlinear distortions are regarded as a nonlinear interference noise.…”