Catálogo de publicaciones - libros

In this paper we present a mechanism for obtaining an abstraction of network topology in optical networks in order to compute an end-to-end lightpath across multiple domains.

An optical access network transceiver based on a reflective semiconductor optical amplifier (RSOA) operating as modulator and photodetector is demonstrated. The system shows proper operation at 1.25 Gbit/s to 30 km reach.

We propose novel optical label recognition based on additional pre-spread coding. This method can realize both high recognition power in label recognition and data transmission efficiency in network paths. We present the optical implementation of this method and show the recognition power by simulation.

This paper considers the performance of fixed and incremental feedback buffers in an optical switch, and compares this with the performance of a feedback buffer configuration implementing switchable delay lines. It is shown that for a medium sized switch the switchable delay line implementation outperforms the other configurations, although for a large switch, the incremental structure has the best performance.

We demonstrated a wavelength conversion experiment from 160Gb/s: OTDM signal to 4λ × 40Gb/s:WDM signals with multicasting function by using four-wave mixing in a highly-nonlinear fiber. This technique was based on the OTDM/WDM converter using FWM and the multicasting function is easily available by aligning mutual timing of WDM clock pulses.

Using Four Wave Mixing in SOAs, we produce six simultaneous optical copies of an input NRZ data signal, all signals are compliant with a 200 GHz channel grid.

The existence of an optimal span length for 40 Gbit/s WDM transmission systems with hybrid Raman/EDFA amplification is demonstrated. Optimal lengths are obtained for specific amplifier configurations and different fibre arrangements based on SSMF/DCF and SLA/IDF implementation, using a simple nonlinearity management theory.

Nonlinearity-due Q penalties are experimentally evaluated on a 2000-km, 33-GHz spaced DWDM system, dependently on system length and channel spacing. SPM, FWM and XPM, which is found to be the major constrain, are separately addressed.

In this paper a comparative study of two pump control schemes for suppressing transient gain excursions in EDFA’s is presented. The first control scheme is based on the traditional feedforward/feedback control, while the second scheme is new and uses multiplication to combine the feedforward and feedback blocks. The controller parameters are designed using linearised (small-signal) EDFA model derived from the nonlinear state-space model of Bononi and Rusch. When the controller design is applied to the nonlinear EDFA plant, the new scheme is shown to display some important performance improvements over the traditional scheme.

A sum-of-Gaussian (SGA) technique is presented for dynamic performance monitoring of WDM systems. The higher accuracy and usefulness of SGA technique over conventional Q-value analysis is established. It has been shown that Gaussian approximation (GA) overestimates the transmission penalty by a large amount.