IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0514725
(2006-09-01)
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등록번호 |
US-7664395
(2010-04-04)
|
우선권정보 |
GB-0121308.1(2001-09-03) |
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
Hamilton, Brook, Smith & Reynolds, P.C.
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인용정보 |
피인용 횟수 :
7 인용 특허 :
23 |
초록
▼
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 dat
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.
대표청구항
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What is claimed is: 1. An optical routing module having at least one input and at least one output and operable to select between the outputs, the or each input receiving a respective light beam having an ensemble of different channels, the module comprising: a Spatial Light Modulator (SLM) having
What is claimed is: 1. An optical routing module having at least one input and at least one output and operable to select between the outputs, the or each input receiving a respective light beam having an ensemble of different channels, the module comprising: a Spatial Light Modulator (SLM) having a two dimensional array of pixels, a dispersion device disposed to receive light from said at least one input and constructed and arranged to disperse light beams of different frequencies in different directions whereby different channels of said ensemble are incident upon respective different groups of the pixels of the SLM, and circuitry constructed and arranged to display holograms on the SLM to determine the channels at respective outputs. 2. The optical routing module of claim 1, wherein the dispersion device comprises at least one reflective device and at least one transmissive device. 3. The optical routing module of claim 1, wherein the dispersion device comprises at least one of: a blazed grating, a holographic grating, an etched grating, an arrayed waveguide grating and a prism. 4. The optical routing module of claim 1, wherein the two dimensional SLM having an array of pixels is a reflective SLM incorporating a wave-plate whereby the reflective SLM is substantially polarisation independent. 5. The optical routing module of claim 1, wherein the two dimensional SLM having an array of pixels is a reflective Liquid Crystal on Silicon Spatial Light Modulator (LCOS SLM). 6. The optical routing module of claim 1, further comprising a wave-plate arranged such that light passes through the wave-plate first after passing through the dispersion device a first time, and second before passing through the dispersion device a second time. 7. The optical routing module of claim 6, wherein the dispersion device comprises a first and a second dispersion element. 8. The optical routing module of claim 1, further comprising a wave-plate arranged such that light passes through the wave-plate a first time after passing through a first dispersion element, and a second time before passing through a second dispersion element. 9. The optical routing module of claim 8, wherein the first and second dispersion elements are provided by a single dispersive device. 10. The optical routing module of claim 8, wherein the first and second dispersion elements are provided by separate dispersive devices. 11. The optical routing module of claim 1, wherein the beams of different frequencies are spatially separated when incident upon the array of pixels according to their respective wavelengths. 12. The optical routing module of claim 1, wherein a plurality of input beams are provided from a respective plurality of inputs and the beams are spatially separated when incident upon the array of pixels according to at least one of: their respective input directions; and their respective wavelengths. 13. The optical routing module of claim 1, wherein at least one group of pixels defines a square. 14. The optical routing module of claim 1, wherein at least one group of pixels defines an arbitrary shape. 15. The optical routing module of claim 1, wherein at least one group of pixels defines a rectangle. 16. The optical routing module of claim 1, wherein at least one group of pixels has a size between 10 and 50 phase modulating elements in at least one dimension. 17. The optical routing module of claim 1, wherein at least one group of pixels has a size in one dimension that is at least 2 times a 1/e spot half-width of an amplitude distribution of an incident beam measured in the same dimension. 18. The optical routing module of claim 1, wherein a property of at least one group of pixels is varied, the property including at least one of: size, shape and position. 19. The optical routing module of claim 1, wherein each group of pixels comprises a plurality of subgroups, wherein at least one subgroup is controlled so as to have a phase effect different to at least one other subgroup. 20. The optical routing module of claim 1, further comprising a control device operable to delineate groups of individual phase-modulating elements; to select, from stored control data, control data for each group of phase-modulating elements; to generate from the respective selected control data a respective hologram at each group of phase-modulating elements; and to vary at least one of the delineation of the groups and the selection of control data whereby upon illumination of said groups by respective light beams, respective emergent light beams from the groups are controllable independently of each other. 21. The optical routing module of claim 1, having groups of pixels of the two-dimensional SLM assigned to respective wavelength channels, and further comprising a control circuit operable to delineate guard bands between said groups. 22. The optical routing module of claim 21, wherein at least one guard band is configured to route light in a direction different to respective directions routed by said groups. 23. The optical routing module of claim 21, wherein at least one guard band is effective to narrow a bandwidth of a wavelength channel carried by a group of pixels. 24. A routing device having an input and plural outputs, the input constructed and arranged to receive an input light beam having plural frequencies, the device comprising: a two dimensional Spatial Light Modulator (SLM) having an array of pixels, and a dispersion device disposed to receive light from said at least one input and constructed and arranged to disperse beams of said light of different frequencies in different directions to be incident upon a respective different group of the pixels of the two-dimensional SLM, wherein the routing device is operable to select the frequencies of the input light beam to appear in the outputs, wherein each output may contain any desired set of the plural frequencies. 25. A routing device according to claim 24, wherein the members of the desired set may be varied in use. 26. A routing device according to claim 24, wherein at least two of the outputs contain at least one common frequency. 27. A routing device having plural input signals and an output, the output constructed and arranged to deliver a signal having plural frequencies, the device comprising: a two dimensional Spatial Light Modulator (SLM) having an array of pixels, and a dispersion device disposed to receive light from the input signals and constructed and arranged to disperse beams of said light of different frequencies in different directions to be incident upon a respective different group of the pixels of the two-dimensional SLM, wherein the routing device is operable to combine the frequencies from the input signals to appear in the output, wherein each input signal may contain any desired set of the plural frequencies of the output.
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