We report the first demonstration of polarisation insensitive all-optical wavelength conversion (AOWC) for single wavelength channel 640 Gbit/s return-to-zero differential-phase-shift-keying (RZ-DPSK) signal and 1.28 Tbit/s polarisation multiplexed (Pol-Mux) RZ-DPSK signals using a 100-m polarisation-maintaining highly nonlinear fiber (PM-HNLF) in a polarisation diversity loop configuration. Th...

The channel law for amplitude-modulated solitons transmitted through a nonlinear optical fibre with ideal distributed amplification and a receiver based on the nonlinear Fourier transform is a noncentral chi distribution with 2n degrees of freedom, where n = 2 and n = 3 correspond to the singleand dual-polarisation cases, respectively. In this paper, we study the capacity of this channel in bit...

Optical coherence tomography (OCT) is a new method potentially applicable for the analysis of neurodegeneration in multiple sclerosis (MS) by capturing thinning of the retinal nerve fibre layer (RNFL). Metaanalyses of time domain OCT (TDOCT) data demonstrates RNFL thinning of 20 μm (95%CI 18-23, n=2063, p¡0.00001) following MS optic neuritis (MSON) and μm (95%CI 6-9, n=3154, p¡0.00001) in MS wi...

High-repetition-rate ultrafast lasers are needed for diverse applications. Harmonic modelocking, where multiple identical, equidistant pulses circulate in the cavity, reaches beyond practical limitations of reducing cavity length. However, it suffers from stochastic deviations that manifest as supermodes radio-frequency spectrum and difficulties maintaining same harmonic state, often coupled wi...

A review of passive components based on optical microfibers is presented. KeywordsOptical fibre tapers; optical microfibers, fibre devices, optical fibre nanowires

Introduction: Polarisation-mode dispersion (PMD) is a major impediment for network operators seeking to increase the per channel data rate to beyond 10 Gbit=s on long-haul fibre-optic links. To ensure the reliability of their fibre-optic network at higher bit rates, network engineers must be able to predict PMD-induced outage rates. A PMD-induced outage is one which the instantaneous differenti...

Linewidth measurements of a distributed feedback (DFB) fibre laser are made using delayed self heterodyne interferometry (DHSI) with both Mach-Zehnder and Michelson interferometer configurations. Voigt fitting is used to extract and compare the Lorentzian and Gaussian linewidths and associated sources of noise. The respective measurements are w(L) (MZI) = (1.6 ± 0.2) kHz and w(L) (MI) = (1.4 ± ...