An important group of nonlinear processes in optical fibre involves the mixing of four waves due to the intensity dependence of the refractive index. It is customary to distinguish between nonlinear effects that require external/pumping waves (cross-phase modulation and parametric processes such as four-wave mixing) and self-action of the propagating optical field (self-phase modulation and mod...

The use of new types of fibre with high density and high capacity dense wavelength division multiplexing (DWDM) systems leads to the investigation of system performance with these fibres. This paper compares the performance of a high-density (0.8bits/s/Hz) DWDM transmission system with 25 channels and 40Gb/s per channel with a channel spacing of 50GHz, using conventional single-mode fibre or no...

We address the problem of group delay ripples in chirped fibre gratings on dispersion compensation in optical transmission systems. We show that the intersymbol interference, which is a highly harmful effect induced by the group delay ripples in transmission systems, can be substantially reduced by the use of nonlinear optical loop mirrors. This leads to an improvement of the system performance...

We introduce a novel transmission technique of periodic in-line all-optical format conversion between return-to-zero and non-return-to-zero-like aimed at delaying the accumulation of format-specific impairments. A particular realization of this approach using in-line normal dispersion fibre-enhanced nonlinear optical loop mirrors at 40Gbit/s data rate is presented.

We quantify the benefits of intra-channel nonlinear compensation in meshed optical networks, in view of network configuration, fibre design aspect, and dispersion management. We report that for a WDM optical transport network employing flexible 28Gbaud PM-mQAM transponders with no in-line dispersion compensation, intra-channel nonlinear compensation, for PM-16QAM through traffic, offers signifi...

In this paper we have discussed a simulated long haul optical transmission system Over the single mode fibre which is prove to the liner chromatic dispersion as well as Non linearity. Both Parameter have been of great concern as these confine the overall Efficiency of the system. Loop control is commonly chosen as an important component in optical communication system. Loop control is very simp...

Recent advanced techniques and associate technologies of transmission, wavelength multiplexing and channel routing for Tera-b/s photonic transport networks and their impacts on optical networking are discussed including (i) optical modulation formats and associate coding for optimising dispersion tolerance in linear and nonlinear operating regimes (ii) dispersion management and compensation tec...

Benefiting from ultrafast temporal resolution, broadband spectral bandwidth, as well as high peak power, passively mode-locked fibre lasers have attracted growing interest and exhibited great potential from fundamental sciences to industrial and military applications. As a nonlinear system containing complex interactions from gain, loss, nonlinearity, dispersion, etc., ultrafast fibre lasers de...