Richard Black – författare

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A complete guide to optical waveguide modes

This in-depth work explains how transverse optical waveguide geometry influences field distribution and polarization properties. You will gain a thorough understanding of the fundamental physics of mode structure.

Optical Waveguide Modes covers single- and few-mode optical waveguides with an emphasis on single-core and multicore optical fibers and couplers, including a large range of geometries and anisotropies. Analysis is performed using extensions of the weak-guidance perturbation formalism together with elementary group representation theory. This definitive volume offers a detailed introduction to and classification of diverse forms of fundamental and higher-order modes and various polarization manifestations.

Coverage includes:

At the start of the 1990s, there was great optimism that the end of the Cold War might also mean the end of the "refugee cycle" - both a breaking of the cycle of violence, persecution and flight, and the completion of the cycle for those able to return to their homes. The 1990s, it was hoped, would become the "decade of repatriation." However, although over nine million refugees were repatriated worldwide between 1991 and 1995, there are reasons to believe that it will not necessarily be a durable solution for refugees. It certainly has become clear that "the end of the refugee cycle" has been much more complex, and ultimately more elusive, than expected. The changing constructions and realities of refugee repatriation provide the backdrop for this book which presents new empirical research on examples of refugee repatriation and reconstruction. Apart from providing up-to-date material, it also fills a more fundamental gap in the literature which has tended to be based on pedagogical reasoning rather than actual field research. Adopting a global perspective, this volume draws together conclusions from highly varied experiences of refugee repatriation and defines repatriation and reconstruction as part of a wider and interrelated refugee cycle of displacement, exile and return. The contributions come from authors with a wealth of relevant practical and academic experience, spanning the continents of Africa, Asia, Central America, and Europe.

Refugees, Environment and Development is concerned with the complex interrelationships between forced migration, natural resource management and ''sustainable development''. The book challenges the growing rhetoric that refugees ''cause'' environmental degradation, and that environmental decline is promoting a new wave of ''environmental refugees''. Drawing on examples from Africa, Asia and Latin America, as well as detailed case studies of the Rwandan emergency of 1994-96, and lesser known refugee movements to Guinea and Senegal in West Africa, the book argues against a neo-Malthusian view of the relationship between population, environment and migration. The author explores alternative approaches to the dynamic processes of social and environmental change in refugee situations.This is an ideal text for undergraduate and postgraduate students concerned with environment, development and migration studies, as well as policy-makers and practitioners in the field.

Refugees, Environment and Development is concerned with the complex interrelationships between forced migration, natural resource management and ''sustainable development''. The book challenges the growing rhetoric that refugees ''cause'' environmental degradation, and that environmental decline is promoting a new wave of ''environmental refugees''. Drawing on examples from Africa, Asia and Latin America, as well as detailed case studies of the Rwandan emergency of 1994-96, and lesser known refugee movements to Guinea and Senegal in West Africa, the book argues against a neo-Malthusian view of the relationship between population, environment and migration. The author explores alternative approaches to the dynamic processes of social and environmental change in refugee situations.This is an ideal text for undergraduate and postgraduate students concerned with environment, development and migration studies, as well as policy-makers and practitioners in the field.