Ultrafast all-optical signal processing how and why?

Demand for fast and secure high capacity networks is growing. Currently offered solutions are hampered by the reappearance of electronic bottleneck. It is believed that to fully utilize transmission bandwidth of optical networks ultrafast all-optical signal processing may need to by implemented. Such approaches will be discussed

OCDMA, electronic bottleneck, and challenges for fiber-optic communications

Optical fibre links have a great capacity potential for the point-to-point data transport. This aggregate data throughput has been further improved by implementation of data multiplexing techniques such as DWDM, OTDM, and OCDM. However fibre link capabilities becomes severely limited at the fiber links end points where the routing and switching takes place by the electronic serial data processing abilities of current CMOS electronics. Given a future where networks will need to perform ultra-high speed serial data processing all optically there will be basic requirements for all optical devices capable of performing at data rates well beyond is possible electronically today. To overcome this electronic bottleneck we have developed an ultrafast all optical photonic switch which does not suffer from the currier recovery time limitations affecting all optical switches based on Semiconductor Optical Amplifiers

GMPLS energy efficiency scheme for green photonic networks

Since its emergence the internet has been a significant part of today's modern living. Defined by its interconnections and routing policies, it has fuelled increased demands for provisioning of new more advanced services that are able to dynamically react to changes within the network. These services however, lead to enormous energy consumption in contrast to a global drive for a greener environment. Hence the existence of an optical infrastructure that complies with the principles of zero-carbon emission is imperative. Subsequently, in this paper, we present an energy model of Generalized Multi-Protocol Label Switching (GMPLS) network for more power efficient Green Photonic Networks. We are proposing a greener network design based on a novel routing algorithm to deliver power reduction through implementation of so called "Hibernation" approach. The scheme includes network topology such as group the nodes configuration, segmentation of the link/ports, and wavelength provisioning via partitioning. The performance evaluations of these energy saving schemes are investigated by including various challenging issue on "greening the internet" and reduces carbon footprint. In addition, to study the impact of wavelength request, blocking probability and power consumption in relation to network load is taken into account. A trade-off is observed between energy per bit, wavelengths offered (Erlang) and blocking probability as a result of the idling nodes

Optical high voltage breakdown prediction using thermal lensing effect in transformer oil

We describe an optical system to monitor microscopic pre-breakdown events in liquid insulation. The system has successfully demonstrated its ability to predict high voltage breakdown in transformer oil. A simple theory based on a thermal lens build up between electrodes as a result of applied voltage is presented to explain the system operation and obtained measured results

Tunable chromatic dispersion management of optical fibre communication link using SOA

High data rate communication demands the well compensated chromatic dispersion in the optical fibre communication. Generally dispersion compensated fibre (DCF) modules are utilized in the link with known fibre lengths. On the other hand, at ultra high data rates when a new user wants to access the network with a connecting cable of unknown length, automated dispersion compensation technique will ensure the error free communication with much greater flexibility to operate the network. An experiment was carried out to compensate the chromatic dispersion in an optical fibre network by passing the received data signal through an SOA. By controlling the SOA pump current, it was possible to automatically compensate the chromatic dispersion without changing the lengths of DC

Suppression of beating noise of narrow-linewidth erbium-doped fiber ring lasers by use of a semiconductor optical amplifier

Beating noise in narrow-linewidth erbium-doped fiber ring lasers puts severe limitations on applications of the lasers. We demonstrate the suppression of beating noise in fiber ring lasers by using a semiconductor optical amplifier in the laser cavity, which acts as a high-pass filter. Two different ring structures are presented as examples to demonstrate this beating noise suppression

Application of semiconductor optical amplifier (SOA) in managing chirp of optical code division multiple access (OCDMA) code carriers in temperature affected fibre link

Chromatic and temperature induced dispersion can both severely affect incoherent high data rate communications in optical fiber. This is certainly also true for incoherent Optical Code Division Multiple Access (OCDMA) systems with multi-wavelength picosecond code carriers. Here, even a relatively small deviation from a fully dispersion compensated transmission link can strongly impact the overall system performance, the number of simultaneous users, and the system cardinality due to the recovered OCDMA auto-correlation being strongly distorted, time-skewed, and having its Full Width at Half Maximum (FWHM) value changed. It is therefore imperative to have a simple tunable means for controlling fiber chromatic or temperature induced dispersion with high sub-picosecond accuracy. To help address this issue, we have investigated experimentally and by simulations the use of a Semiconductor Optical Amplifier (SOA) for its ability to control the chirp of the passing optical signal (OCDMA codes) and exploit the SOA ability for dispersion management of a fiber link in an incoherent OCDMA system. Our investigation is done using a 19.5 km long fiber transmission link exposed to different temperatures (20 and 50) ºC using an environmental chamber. By placing the SOA on a transmission site and using it to manipulate the code carriers chirp via SOA bias adjustments, we have shown that this approach can successfully control the overall fiber link dispersion, and can also mitigate the impact on the received OCDMA auto-correlation and it’s FWHM. The experimental data obtained are in a very good agreement with our simulation results

Recent advances in all-optical signal processing for performance enhancements of OCDMA interconnects

The demand for data rates increases presents a great technological challenge to the well-established CMOS electronics. As a result, the electronic signal processing in optical interconnects became the stumbling block in supporting these growing demands. In this paper we will discuss and demonstrate our recent results which enable to overcome some of the challenges in OCDMA-based interconnects via implementation of silicon photonics

Photonic platform and the impact of optical nonlinearity on communication devices

It is important to understand properties of different materials and the impact they have on devices used in communication networks. This paper is an overview of optical nonlinearities in Silicon and Gallium Nitride and how these nonlinearities can be used in the realization of optical ultra-fast devices targeting the next generation integrated optics. Research results related to optical lasing, optical switching, data modulation, optical signal amplification and photo-detection using Gallium Nitride devices based on waveguides are examined. Attention is also paid to hybrid and monolithic integration approaches towards the development of advanced photonic chips

Overview of the second order optical nonlinearity in GaN waveguides for use in devices for optical communication

The purpose of this poster is to show how second order nonlinearity of GaN is used in realization of advanced optical devices in telecommunication