Redfern Optical Components Pty Ltd
Redfern Optical Components Pty Ltd Patent applications | ||
Patent application number | Title | Published |
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20110299812 | OPTICAL STRUCTURE WRITING SYSTEM - The present invention relates to a system for writing an optical structure in a waveguide. The system including, means for splitting a light beam into two coherent writing beams, an optical circuit for directing the writing beams along substantially the same optical path in opposite directions such that they produce an interference pattern in an interference region substantially within the waveguide to write the optical structure, said optical circuit including at least two acousto-optic modulators (AOMs) configured to enable a controllable phase shift to be applied to a light beam propagating therethrough, the two AOMs being arranged such that, in use, each AOM shifts the phase of only one of the writing beams, to thereby provide a controllable phase difference between the writing beams. | 12-08-2011 |
20100008625 | METHOD FOR DESIGNING OPTIMISED MULTI-CHANNEL GRATING STRUCTURES - A method is described for designing a multi-channel grating structure having at least one specified spectral characteristic in a photosensitive material, the multi-channel grating structure having at least one free spectral characteristic which is not a specified spectral characteristic. An initial value is provided for each free spectral characteristic, and an initial multi-channel grating function is provided that describes an initial multi-channel grating structure by applying a spectral to spatial domain algorithm to the specified predetermined spectral characteristic using the initial value. A target multi-channel grating function is provided which describes a target multi-channel grating structure in the photosensitive material and an updated value is determined for each initial value with reference to the spectral characteristics of the target multi-channel grating function. An updated multi-channel grating function is derived which describes an updated multi-channel grating structure in the photosensitive material by applying a spectral to spatial domain algorithm to the predetermined spectral characteristic using the at least one updated value. After at least one iteration, the updated multi-channel grating function is output to describe the multi-channel grating structure. | 01-14-2010 |