Recent advances in liquid crystal (LC) materials and VLSI technology have enabled the development of multi-phase spatial light modulators (SLM) that can perform high-resolution, dynamic optical beam positioning as well as temporal and spatial beam shaping in the 1550 nm optical communication window. These attractive features can effectively be used to achieve optical switching, optical spectral equalization, tunable optical filtering and many other functions that are important for future reconfigurable optical telecommunication networks. In this paper, we review potential optical telecommunication applications based on LC-SLMs.
Various configurations of dual recycling laser interferometers are tested, numerically, for their tolerance to wave-front distortions induced by mirror tilts and curvature mismatch. We verify that, in the presence of such geometric imperfections, dual recycling designs experience significantly less power loss than straight power recycling devices. Importantly, we show that the power loss reduction from the detection port is accompanied by maintenance of circulating power in the instrument and hence maintenance of signal response. We confirm predictions that when a cavity is placed at the output port of the interferometer, tolerance to geometric imperfections is further improved by typically an order of magnitude.PACS numberk): 04.80. +z, 07.60.Ly, 95.75.Kk
The excess carrier distribution within a semiconductor illuminated by a moving light spot is determined. The analysis is given for the rectangular and circular light spots moving along a straight line on an infinite semiconductor panel. Graphical presentation is given for the particular case of the semiconductor light strip illumination.FIG. 1. Geometry of rectangular light spot illumination.
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