In this Article dispersion characteristic of conventional optical waveguide with helical winding at core – cladding interface has been obtained. The model dispersion characteristics of optical waveguide with helical winding at core-cladding interface have been obtained for five different pitch angles. This paper includes dispersion characteristics of optical waveguide with helical winding, and ...

We study numerically optical turbulence using the particular example of a recently created, ultra-long fibre laser. For normal fibre dispersion, we observed an intermediate state with an extremely narrow spectrum (condensate), which experiences instability and a sharp transition to a fluctuating regime with a wider spectrum. We demonstrate that the number of modes has an impact on the condensat...

In this paper, we investigate the performance of passive and active recirculating fibre loop buffers (RFLB) in an optical time division multiplexing (OTDM) network employing soliton pulse shape. Both standard fibre and dispersion shifted fibre (DSF) are considered. Further to previous work [1], it is no longer assumed that switching mechanism is ideal, and both insertion loss and crosstalk are ...

This paper proposes a promising technique to compensate chromatic dispersion (CD) by using an optical all pass filter (OAPF) as an optical equaliser. The phase response of OAPF will be designed to cancel the phase delay of single mode fibre (SMF) which is the main cause of CD. The simulation of the mathematical model of the optical communication system at 10 Gb/s employing the proposed OAPF wil...

A short section of photonic crystal fibre has been used for ultra-short pulse compression. The unique optical properties of this novel medium in terms of high nonlinearity and relatively small group velocity dispersion are shown to provide an ideal platform for the standard fibre pulse compression technique used directly on the nanoJoule output pulses from a commercial laser system. We report a...

Several optical AM-PSK partial response signalling (PRS) systems, also known as correlative level signalling, are evaluated through numerical simulation. Discussion is focussed to three-level PRS systems, namely duobinary, modified duobinary and dicode. Suitable transmitter implementation, taking advantage of the phase of the optical wave, allows the use of standard binary intensity modulation ...

An optical soliton pulse may be used as a control signal in non-linear optical loop mirror demultiplexers in order to reduce timing-jitter noise and cross-talk. A mathematical model for calculating the width of the soliton switching window and optimizing critical parameters such as walk-off time and pulse width has been presented, and its accuracy is verified by solving the nonlinear Schrodinge...

Introduction: Polarisation division multiplexing (Pol-Mux) is an important method to improve spectral efficiency in lightwave communications. For Pol-Mux used in ultra-high-capacity fibre systems, polarisation mode dispersion (PMD) [1] not only distorts and broadens the signal, but also couples polarisation-multiplexed channels. In the case of large PMD, this coupling becomes strongly frequency...

Both nonlinear effects and dispersion are important factors that affect the transmission of optical pulses in fibres. In anomalous region, mutual balance can achieve soliton transmission. Starting from Schrodinger equation pulse, under condition ignoring dispersion, phase shift frequency chirp Gaussian pulse effect self-phase modulation (SPM) derived simulated; numerical simulation SPM spectrum...