 Optical signal free-space conversion board |
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| Polyhedral integrated and free space optical interconnection |
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| Component for optical data transmission |
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| Image processing apparatus |
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| Process and recording media for continuous wave four-level, two-photon holography |
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| Process for the preparation of aryldimethyl(3-aryl-propyl)silanes |
| I claim: 1. A process for the preparation of a compound of the formula I ##STR13## where X is CH.... |
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| Optical information storage on a bacteriorhodopsin - containing film |
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| Asymmetrical dyes with large two-photon absorption cross-sections |
| We claim: 1. A two-photon absorbing chromophore of the formula D--Ar--A wherein Ar is selected from ... |
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| Two-photon upconverting dyes and applications |
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Fiber optic circulator
| Details |
Inventors: Frisken, Steven James;
Assignee: Australian Technology Park Photonic Technologies Pty. Ltd. (Eveleigh, AU)
Primary Examiner: Bovernick; Rodney
Assistant Examiner: Kang; Ellen E.
Attorney, Agent or Firm: Ladas & Parry
A non reciprocal optical device for transmitting light in a forward and reverse direction substantially independently of polarization state from a collection of waveguides. The device includes: a first array of spaced apart waveguides having at least a first wave guide and a second waveguide; a second array of spaced apart waveguides including at least a third waveguide; an imaging component for focusing a diverging beam of light disposed between the first array and the second array of waveguides, at least two polarization equalization components for polarization equalization of diverging or converging light, each of the polarization equalization components disposed between a waveguide array and the imaging component; add a plurality of polarization rotation components disposed between each waveguide array. Light from the first waveguide is transmitted to the third waveguide and light from the third waveguide is transmitted to the second waveguide in a polarization independent manner. The polarization equalization components and the imaging component are disposed with respect to one another and with respect to the respective first, second and third waveguides such that light radiating from each of the first, second and third waveguides first passes through one of the at least two polarization equalization components prior to passing through the imaging component which is located between the polarization equalization components. |
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DETAILED DESCRIPTION FIGS.
3 and 4 illustrate the difference in imaging which is fundamental to the operation of the present invention.
In FIG.
3, illustrating a simplified view of the prior art, it is shown how light proceeding from a waveguide 301 is collimated by an imaging means 302 to produce a substantially collimated beam.
Double refraction by the crystal 303 displaces the extraordinary beam which is able to be focused by the imaging means 304 to be captured by the waveguide 306.
The ordinary beam is focused by the imaging means 305 and captured by the waveguide 307.
In order to separate the beams by about 1 mm corresponding to the thickness of a GRIN lens a length of crystal of about 1 cm of rutile or calcite is required.
According to one aspect of the present invention, FIG.
4, illustrates the operation of a fiber optic polarization combiner/splitter.
Light proceeding from waveguide 401 passes through the double refraction crystal 402 and imaging means 403 and 404, and is focused onto waveguides 405 and 406 according to polarization state.
The separation of the imaging means 403 and 404 is such that parallel rays of light remain substantially parallel after passing through the imaging means independent of position in the imaging means.
Preferably the imaging means are gradient index lenses of pitch less than 0.
25.
Preferably the waveguides 401,405 and 406 have reduced numerical aperture through mode field expansion to reduce the loss due to distortion and allow a high degree of separation of the polarization states.
FIG.
5 illustrates the first preferred embodiment of the optical circulator according to the present invention for the example of a 4 port circulator.
The extension to more or less ports is straightforward.
An optical circulator, as shown in FIG.
5, is a single in-line device or assembly which includes a first array of waveguides 501, shown here are ports 1 and 3, and a second array of waveguides 511, shown here as ports 2 and 4, disposed at opposite ends of the assembly
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Optical Systems 
