Aleksandra Kaszubowska-Anandarajah

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Introduction: Attainment of the minimum achievable laser diode linewidth with the least associated level of device complexity and lowest component cost are critical for realising many single wavelength laser applications in optical communications, sensors and clocks. The free-running line-width reported for ordinary DFB and DBR laser devices is typically in(More)
The authors present an investigation of wavelength stability of a tunable laser transmitter and its impact on the performance of a 2.5 Gb/s dense wavelength division multiplexed system. The wavelength drift of the laser after switching between channels is accurately measured by using a self-heterodyning technique and an optical filtering technique.(More)
We demonstrate and compare the generation and distribution of pulse position modulation (PPM) ultrawideband (UWB) signals, based on two different techniques using a gain-switched laser (GSL). One uses a GSL followed by two external modulators, while the second technique employs two laser diodes gain switched (GS) using a combined signal from a pattern(More)
An important characteristic of tunable lasers, that may affect system performance, is that they can generate light at various wavelengths as they tune between different wavelength channels. These spurious components could cause severe cross-channel interference if the tunable laser is used in a WDM network. In this paper we investigate the effect of such(More)
The authors present a novel concept of employing optical wavelength packet switching (WPS) in radio-over-fiber (RoF) access networks. The Central Station is equipped with a fast tunable laser (TL), which is externally modulated with a data signal upconverted to a radio frequency. The information transmitted over the network is encoded onto different(More)
The use of tunable lasers (TL) in dense wavelength division multiplexed (DWDM) networks for optical switching, routing and networking has gained a lot of interest in recent years. Employment of such TLs as tunable transmitters in wavelength packet switched (WPS) networks is one of the possible applications of these devices. In such systems, the information(More)
The authors investigate a hybrid radio over fiber system for the generation and distribution of UWB signals. This system is based on gain-switched laser, which is used to generate short optical pulses. The position of these pulses is modulated using electrical data before transmitting them to the remote antenna unit (RAU). At the RAU, the optical signal is(More)
Fast development of the modern telecommunication networks such as fiber-to-the-home or radio-over-fiber systems require an inexpensive yet reliable optical transmitter for electro-optic conversion. Such devices should be able to generate stable, single moded optical signals suitable for athermal operation. Discrete Mode Lasers (DMLs) are able to fulfill all(More)
The benefits of adopting optical burst switching (OBS) in optical networks as well as the technological issues of the optical layer have been extensively studied. One of the challenges in developing commercial OBS systems is the use of the Erbium-Doped Fiber Amplifier (EDFA) technology to amplify bursty optical signals. A significant impairment in(More)
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