Peter Healey

Review of long wavelength single-mode optical fiber reflectometry techniques

This paper reviews the worldwide activity on long-wavelength ( >1.1-\mu m) single-mode optical fiber reflectometry and compares and contrasts the many different approaches being taken to equipment design.

DWDM reach extension of a GPON to 135 km

We report operation of a GPON (gigabit-capable passive optical network) (2.488 Gbit/s downstream, 1.244 Gbit/s upstream) over 135 km giving performance consistent with ITU-T standards. Advanced DWDM equipment is used to extend the physical reach and provide fibre gain.

Statistics of Rayleigh Backscatter From a Single-Mode Fiber

This paper contains a detailed analysis of the statistical properties of the Rayleigh backscatter signal from a single-mode optical fiber. Derivations of the first- and second-order statistics, autocorrelation function, and power spectral density of the backscatter wave are given. The probability density functions of the amplitude and intensity of the backscatter signal are also calculated.

Reflective SOAs for spectrally sliced WDM-PONs

We have given the first quantitative description of the amplitude squeezing effect in semiconductor optical amplifiers/modulators and shown how this effect can be exploited in a spectrally-sliced WDM-PON. A system demonstration of 8 Gigabit Ethernet channels over 25 km of standard access fibre was presented.

Next generation extended reach PON

The author gives a slide presentation of next generation access passive optical networks.

Optical interconnect based on a fibre bus

A technology which may form a powerful optical interconnection scheme based on a bus architecture is presented. It is shown that the fibre array connectors involved require alignment tolerances comparable to those of present electrical connectors. Further system flexibility can be obtained by tailoring the connector wavelength characteristics. Results of an experiment, where distributed amplification within the backplane of an optical bus was used to compensate for the power removed at the access points, are also presented. This allows a significantly higher number of output ports to be served than would be possible using a passive bus. As an example application, the feasibility of using the technology as the backplane interconnection in a card and rack system is demonstrated. Extension to a switching scheme using the multi-dimensional optical network concept is described.

Multidimensional optical switching networks

A novel switch fabric which trades the inherent spectral and spatial bandwidth of optical systems against a reduction in equipment complexity is described. The architecture, which is based on a multiple access bus structure, is nonblocking in the wide sense and capable of graceful growth. It also offers the possibility of achieving the theoretical minimum of crosspoints needed for a generalized interconnection network. It is anticipated that experimental multidimensional bus switched (MDBS) networks with Tbit throughput could be designed around currently available research components. The design of such networks and the technology options are described. It is noted that there a number of technology paths open that would lead to very large MBDS networks with throughputs well beyond what is readily obtainable with conventional electronic architectures; one interesting development in this direction is the D fiber back plane.<<ETX>>

Demonstration of error-free 25Gb/s duobinary transmission using a colourless reflective integrated modulator

We report on a hybrid reflective electroabsorption modulator-based photonic integrated circuit, demonstrating error-free 25.3Gb/s duobinary transmission (BER<;1×10-12) over 35km of SSMF. Colourless operation with 1.2dB OSNR variation over the C-band is confirmed.

Multidimensional optical interconnection networks

A family of fixed and reconfigurable optical interconnection networks offering the potential of Terabit throughput are described. The designs are based on a bus architecture that combines space, wavelength and other multiplexing methods and have the following attractive features:- graceful growth; wide-sense non-blocking operation; low space switch crosspoint count; and simple control algorithm.

Error-free 10Gb/s duobinary transmission over 215km of SSMF using a hybrid photonic integrated reflective modulator

We demonstrate a novel hybrid photonic integrated circuit, incorporating reflective electroabsorption modulators, which achieves error-free 10Gb/s duobinary transmission over 215km of standard fiber with similar performance to a commercial lithium niobate duobinary MZM.