Lasers and Electro-Optics Society Meeting 

About: Lasers and Electro-Optics Society Meeting is an academic conference. The conference publishes majorly in the area(s): Laser & Semiconductor laser theory. Over the lifetime, 9254 publications have been published by the conference receiving 34921 citations.

Optical Coherence Tomography

Abstract: Optical coherence tomography (OCT) has developed rapidly since its first realisation in medicine and is currently an emerging technology in the diagnosis of skin disease. OCT is an interferometric technique that detects reflected and backscattered light from tissue and is often described as the optical analogue to ultrasound. The inherent safety of the technology allows for in vivo use of OCT in patients. The main strength of OCT is the depth resolution. In dermatology, most OCT research has turned on non-melanoma skin cancer (NMSC) and non-invasive monitoring of morphological changes in a number of skin diseases based on pattern recognition, and studies have found good agreement between OCT images and histopathological architecture. OCT has shown high accuracy in distinguishing lesions from normal skin, which is of great importance in identifying tumour borders or residual neoplastic tissue after therapy. The OCT images provide an advantageous combination of resolution and penetration depth, but specific studies of diagnostic sensitivity and specificity in dermatology are sparse. In order to improve OCT image quality and expand the potential of OCT, technical developments are necessary. It is suggested that the technology will be of particular interest to the routine follow-up of patients undergoing non-invasive therapy of malignant or premalignant keratinocyte tumours. It is speculated that the continued technological development can propel the method to a greater level of dermatological use.

Just-Enough-Time (JET): a high speed protocol for bursty traffic in optical networks

Abstract: We investigate a high speed protocol called Just-Enough-Time (JET) based on a tell-and-go (TAG) protocol It is suitable for bursty traffic where the duration of each burst is neither long enough to warrant circuit switching nor short enough to fit in a packet The proposed JET protocol can efficiently utilize the bandwidth, reduce the latency and provide data transparency

Holographic Memories

Abstract: Shift multiplexing is a method for holographic storage particularly suitable for holographic 3D disks. Holo- grams are recorded by interfering the signal beam with a spherical reference. In this paper we review the shift multiplexing mechanism and describe the design of a holographic 3D disk system that is capable of storing 12.4 bits/µm2.

On the evolution of clusters of near-duplicate Web pages

Abstract: We expand on a 1997 study of the amount and distribution of near-duplicate pages on the World Wide Web. We downloaded a set of 150 million Web pages on a weekly basis over the span of 11 weeks. We then determined which of these pages are near-duplicates of one another, and tracked how clusters of near-duplicate documents evolved over time. We found that 29.2% of all Web pages are very similar to other pages, and that 22.2% are virtually identical to other pages. We also found that clusters of near-duplicate documents are fairly stable: Two documents that are near-duplicates of one another are very likely to still be near-duplicates 10 weeks later. This result is of significant relevance to search engines: Web crawlers can be fairly confident that two pages that have been found to be near-duplicates of one another will continue to be so for the foreseeable future, and may thus decide to recrawl only one version of that page, or at least to lower the download priority of the other versions, thereby freeing up crawling resources that can be brought to bear more productively somewhere else.

Transparent optical packet switching: The European ACTS KEOPS project approach

Abstract: The huge traffic growth which is currently experienced (traffic nearly doubles every year) and foreseen to continue for several years calls for high capacity networks capable of efficiently handling various types of traffic (voice, video, data). WDM (Wavelength Division Multiplexing) optical networks exploiting also fast optical packet switching are expected to provide the required capacity and flexibility for the next generation of high-speed networks. In this context, the European ACTS KEOPS project (KEys to Optical Packet Switching) has concentrated on the definition, development and assessment of optical packet switching and routing networks capable of providing transparency to the payload bit rate. Optical packets of fixed duration have been considered where the payload bit rate, which is user-dependent, can vary from a few hundred Mb/s to 10 Gb/s whereas the header is at a fixed low bit rate (622 Mb/s) to facilitate processing at the network/node interfaces. The challenge addressed by the KEOPS project was therefore to combine the advantages of the relatively coarse-grained WDM techniques with emerging all-optical switching capabilities to yield a high-throughput optical platform directly underpinning next generation data networks (ATM, IP). The project which involved nine partners (Alcatel Alsthom Recherche (F), France Telecom-CNET (F), CSELT (I), Technical University of Denmark (DK), Alcatel CIT (F), Alcatel SEL (D), University of Bologna (I), ETH-Zurich (CH) and University of Strathclyde (UK)) has addressed both network and system studies as well as demonstration experiments based on advanced optoelectronic components developed in the project in order to validate the proposed concept.