There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

Light-Emitting Diodes. (Monographs in Electrical and Electronic Engineering.) By A. A. Bergh and P. J. Dean. Pp. viii+591. (Clarendon: Oxford; Oxford University: London, 1976.) £22.

/pdf/light-emitting-diodes-ubzde6g9qc.pdf

Light-emitting diodes

Singular perturbations and order reduction in control theory - An overview

Singular perturbations and time-scale methods in control theory: Survey 1976-1983

A marriage of optical fibre fabrication technology and LSI microfabrication technology gave birth to fibre-matched silica waveguides on silicon: thick glass layers of high-silica-content glass are deposited on silicon by flame hydrolysis, a method originally developed for fibre preform fabrication. Silica channel waveguides are then formed by photolithographic pattern definition processes followed by reactive ion etching. This ‘high silica (HiS) technology’ offers the possibility of integrating a number of passive functions on a single silicon chip, as well as the possibility of the hybrid integration of both active and passive devices on silicon. This paper reviews the NTT HiS technology and its application to integrated-optic components such as optical beam splitters, optical switches, wavelength-division multi/demultiplexers and optical frequency-division multi/demultiplexers. The clear and simple waveguide structures produced by the HiS technology make it possible to design and fabricate these components with high precision and excellent reproducibility.

Silica waveguides on silicon and their application to integrated-optic components

This paper focuses on how transmission error performance can be evaluated by parameters such as errored seconds (ES) and severely errored seconds (SES), under in-service conditions. Currently, attention is being paid to In-Service Monitoring (ISM) as an effective measurement technique for the error performance in digital networks. So the paper, first of all, overviews error performance parameters and shows the concept of ISM. It next discusses estimation methods for the error performance of digital channels by using information on anomaly and defect events in transmission systems. Furthermore, the paper refers to the potential usage of ISM for service quality estimation and performance assurance. >

In-service monitoring methods/spl minus/better ways to assure service quality of digital transmission

Call admission control (CAC) is essential for the QoS guarantee communications VoIP services require QoS guarantee in the existing telephony services This paper proposes a new CAC scheme for VoIP to achieve an efficient use of network resources by adopting a dynamic routing and a routing history table This scheme chooses the better route out of the two candidate routes where the admission conditions are satisfied Two candidate routes are randomly chosen from all the available candidate routes The routing history table memorizes the resulting routing information for the fixed time interval for the succeeding calls Within the fixed time interval, the succeeding calls are assigned to the same route After the fixed time interval, the memorized routing information is cleared, and the call admission control algorithm starts again from the beginning It is confirmed by simulations that the proposed scheme achieves better performance than the existing CAC with alternate routing scheme

A new VoIP call admission control scheme with use of alternate routing for low call loss probability

Link aggregation bundles multiple physical links on a single virtual link, enabling very high-speed and large-capacity data communications. It also enables redundant communications. Several link aggregation methods have been proposed. These methods utilize transport layer link aggregation. In this paper, a new application level link aggregation is proposed and implemented on Android OS, which is one of the popular OSs for mobile devices such as smartphones and tablet PCs. The proposed application level link aggregation method is verified with use of an implemented terminal.

A new application level link aggregation and its implementation on Android terminals

PURPOSE:To avoid the echo produced by a coupling line and to expand an optical broadcast communication network in an easy way, by expanding the constitution of the said communication network with connection of plural star couplers CONSTITUTION:The n units of terminals 1-1-1-n are connected to n pieces of output optical fibers of a star coupler 1' as well as to n pieces of input optical fibers of a coupler 1 of a star coupler pair 1 The terminal 2-1-2-n of a star coupler 2 are connected in the same connecting way as mentioned above The pair of 1 and 1' are connected to the pair of 2 and 2' by supplying the output optical fiber of the coupler 1 to the coupler 2' and supplying the output optical fiber of the coupler 2 to the coupler 1' respectively

Optical broadcast communication network

Technologies a fibre optique pour la transmission de television a haute resolution. Essai en place d'un systeme developpe au Japon a multiplexage a compression temporelle

http://ieeexplore.ieee.org/iel7/7227860/7249567/07249582.pdf

Koichi Asatani

Papers

In-service monitoring methods/spl minus/better ways to assure service quality of digital transmission

A new VoIP call admission control scheme with use of alternate routing for low call loss probability

A new application level link aggregation and its implementation on Android terminals

Optical broadcast communication network

Fiber-Optic HDTV Transmission Technology