Discrete Multitone Modulation for Maximizing Transmission Rate in Step-Index Plastic Optical Fibres

The use of standard 1-mm core-diameter step-index plastic optical fiber (SI-POF) has so far been mainly limited to distances of up to 100 m and bit-rates in the order of 100 Mbit/s. By use of digital signal processing, transmission performance of such optical links can be improved. Among the different technical solutions proposed, a promising one is based on the use of discrete multitone (DMT) modulation, directly applied to intensity-modulated, direct detection (IM/DD) SI-POF links. This paper presents an overview of DMT over SI-POF and demonstrates how DMT can be used to improve transmission rate in such IM/DD systems. The achievable capacity of an SI-POF channel is first analyzed theoretically and then validated by experimental results. Additionally, first experimental demonstrations of a real-time DMT over SI-POF system are presented and discusse

A Robust and Low-Cost 2-Dimensional Pressure Sensing System using Polymer Optical Fibre

A novel system based on a robust grid of standard low-cost Polymer Optical Fibres has been created which efficiently detects varying 2-dimensional pressure profiles at high speed. Unobtrusive body movement detection in bed is demonstrated with 25 profiles/s using an easy to manufacture 16×8 grid

Frequency spectra in an optical CPFSK heterodyne delay demodulating receiver using manchester coding

In this paper exact analytical expressions of the power spectra of a Manchester coded CPFSK signal with arbitrary modulation index are derived. For the signal after delay & multiply demodulation exact analytical expressions of the power spectra with modulation index 1 are derived, and computer simulations are used to calculate these spectra for various modulation indices. Moreover, the analytically derived power spectra are verified by computer simulations The simulation results correspond extremely well with the analytically calculated spectra. These signal spectra are important for the design and construction of the pre and post detection filters in the receiver

Crosstalk-free AWGR-based 2-D IR beam steered optical wireless communication system for high spatial resolution

By creating polarization orthogonality between the odd and even channels, crosstalk-free OWC link is realized with spectral overlap. This technique can tolerate the wavelength misalignment between AWGRs and lasers, which relaxes the design of high port-count AWGRs and wavelength stable laser