Optical processing
First Claim
1. An optical add/drop multiplexer having a reflective SLM having a two-dimensional array of controllable phase-modulating elements, a diffraction device and a focussing device wherein light beams from a common point on the diffraction device are mutually parallel when incident upon the SLM, and wherein the SLM displays respective holograms at locations of incidence of light to provide emergent beams whose direction deviates from the direction of specular reflection.
1 Assignment
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Accused Products
Abstract
To operate an optical device comprising an SLM with a two-dimensional array of controllable phase-modulating elements groups of individual phase-modulating elements are delineated, and control data selected from a store for each delineated group of phase-modulating elements. The selected control data are used to generate holograms at each group and one or both of the delineation of the groups and the selection of control data is/are varied. In this way upon illumination of the groups by light beams, light beams emergent from the groups are controllable independently of each other.
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Citations
8 Claims
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1. An optical add/drop multiplexer having a reflective SLM having a two-dimensional array of controllable phase-modulating elements, a diffraction device and a focussing device wherein light beams from a common point on the diffraction device are mutually parallel when incident upon the SLM, and wherein the SLM displays respective holograms at locations of incidence of light to provide emergent beams whose direction deviates from the direction of specular reflection.
- 2. A test or monitoring device comprising an SLM having a two-dimensional array of pixels, and operable to cause incident light to emerge in a direction deviating from the specular direction, the device having light sensors at predetermined locations arranged to provide signals indicative of said emerging light.
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4. An optical routing module having at least one input and at least two outputs and operable to select between the outputs, the module comprising a two dimensional SLM having an array of pixels, with circuitry constructed and arranged to display holograms on the pixels to route beams of different frequency to respective outputs.
- 5. A routing device having an input and plural outputs, the input constructed and arranged to receive a light beam having plural wavelengths, the device comprising an optical device for selecting the wavelengths of the input beam to appear in the outputs, wherein each output may contain any desired set of the plural wavelengths.
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8. A routing device having plural input signals and an output, the output constructed and arranged to deliver a signal having plural wavelengths, the device comprising a device for combining the wavelengths from the input signals to appear in the output, wherein each input signal may contain any desired set of the plural wavelengths of the output.
Specification