초록 ▼

An optical device is provided with first and second inputs. A first coupler coupled is coupled to the first input and produces at least a first and second output. A second coupler is coupled to the second input and produces at least a first and second output. A third coupler is coupled to the first

An optical device is provided with first and second inputs. A first coupler coupled is coupled to the first input and produces at least a first and second output. A second coupler is coupled to the second input and produces at least a first and second output. A third coupler is coupled to the first output of the first coupler and to the first output of the second coupler. A fourth coupler is coupled to the second output of the first coupler and to the second output of the second coupler. First and second crossing waveguides are provided with an angle selected to minimize crosstalk and losses between the first and second cross waveguides. The first crossing waveguide connects one of the first or second outputs from the first coupler with an input of the fourth coupler. The second crossing waveguide connects one of the first or second outputs from the second coupler with an input of the third coupler. A first phase shifter is coupled to the first and second waveguides. The first and second waveguides connect one of the outputs of the first or second coupler and one of the inputs of the third or fourth couplers. The first, second, third and fourth couplers, the two crossing waveguides and the phase shifter are each formed as part of a single planar chip made of an electro-optical material.

대표청구항 ▼

What is claimed is: 1. An monolithically integrated optical device for receiving and demodulating of an incoming quadrature modulated optical signal having one polarization and transmitted via optical path; the device having a first and a second inputs, comprising: a first adjustable coupler connec

What is claimed is: 1. An monolithically integrated optical device for receiving and demodulating of an incoming quadrature modulated optical signal having one polarization and transmitted via optical path; the device having a first and a second inputs, comprising: a first adjustable coupler connected to the first input and producing at least a first and second output; a second adjustable coupler connected to the second input and producing at least a first and second output; a third adjustable coupler connected to the first output of the first coupler and to the first output of the second coupler; a fourth adjustable coupler connected to the second output of the first coupler and to the second output of the second coupler; electrodes providing said tuning of the first, second, third, and fourth couplers; first and second crossing waveguides with an angle selected to minimize crosstalk and losses between the first and second cross waveguides, the first crossing waveguide connecting one of the first or second outputs from the first coupler with an input of the fourth coupler, the second crossing waveguide connecting one of the first or second outputs from the second coupler with an input of the third coupler; a first phase shifter coupled to the first and second waveguides, the first and second waveguides connecting one of the outputs of the first or second coupler and one of the inputs of the third or fourth couplers, a first, a second, a third and a fourth photodiodes converting optical signal into a first, a second, a third and a fourth electrical signals; the first, second, third and fourth electrical signals being processed to obtain an in-phase and an in-quadrature signals and to recover quadrature modulated data embedded in the incoming quadrature modulated optical signal having one polarization; wherein the first, second, third and fourth couplers, the two crossing waveguides and the phase shifter are each formed as part of a single planar chip made of an electro-optical material. 2. The optical device of claim 1, wherein the optical device is a free-space optical link device. 3. The optical device of claim 1, wherein the optical device is an optical pointing device. 4. The optical device of claim 1, wherein the optical device is a tracking device. 5. The optical device of claim 1, wherein the chip is a single piece of crystal. 6. The optical device of claim 1, wherein the chip is made of LiNbO3 or LiTaO3. 7. The optical device of claim 1, wherein the chip is made of LiNbO3 or LiTaO3 cut at X, or Y, or Z planes. 8. The optical device of claim 1, wherein the first coupler is a Y-junctions. 9. The optical device of claim 1, wherein the second coupler is a Y-junctions. 10. The optical device of claim 1, further comprising: a second phase shifter coupled to the first and second waveguides, the first and second waveguides connecting one of the outputs of the first or second coupler and one of the inputs of the third or fourth coupler. 11. The optical device of claim 10, further comprising: a first analog-to-digital converter and a digital signal processing unit, wherein the digital processing unit performs calibration of the optical device, and a second analog-to-digital converter. 12. The optical device of claim 1, wherein the first, second, third and fourth couplers are 3-dB devices. 13. The optical device of claim 1, wherein the chip is a two-layer structure. 14. The optical device of claim 1, wherein an output power splitting ratio from the first, second, third and fourth couplers is independently adjustable. 15. The optical device of claim 1, further comprising: first, second, third and fourth biased electrodes is coupled to the first, second, third and fourth couplers respectively. 16. The optical device of claim 15, wherein the each of the first, second, third and fourth couplers have electrode geometries with alternating polarity. 17. The optical device of claim 16, wherein the first, second, third and fourth electrodes are split into an even integer number of sections to provide voltages that have a reversed polarity at each section. 18. The optical device of claim 15, wherein each of the first, second, third and fourth electrodes are push-pull electrodes. 19. The optical device of claim 15, wherein the first phase shifter includes a phase-shifting electrode. 20. The optical device of claim 1, wherein the first biased electrode is coupled to the first coupler, the second biased electrode is coupled to the second coupler, the third biased electrode is coupled to the third coupler, and the fourth biased electrode is coupled to the fourth coupler. 21. The optical device of claim 20, wherein the first, second, third and fourth couplers, the first and second crossing waveguides are formed in a first layer, and the first, second, third fourth biased electrodes and the first and second phase shifters are formed in an adjacent second layer. 22. The optical device of claim 1, wherein each of the first, second, third and fourth electrodes are configured to optimize a splitting operating point of the first, second, third and fourth couplers. 23. The optical device of claim 22, wherein each of the first, second, third and fourth electrodes optimize the splitting operating point by splitting an output power ratio of the first, second, third and fourth couplers. 24. The optical device of claim 1, wherein the first phase shifter is adjustable. 25. The optical device of claim 1, further comprising: a second phase shifter. 26. The optical device of claim 25, wherein the second phase shifter is adjustable. 27. The optical device of claim 25, wherein the second phase shifter includes a phase-shifting electrode. 28. The optical device of claim 1, wherein the electro-optical material is a ferroelectric material. 29. The optical device of claim 28, wherein the ferroelectric material is selected from LiNbO3 and LiTaO3. 30. The optical device of claim 1, wherein the electro-optical material is a semiconductor material. 31. The optical device of claim 30, wherein the semiconductor material is selected from Si and InP. 32. The optical device of claim 1, wherein the optical device is made utilizing indifussed metal technology. 33. The optical device of claim 1, includes the optical device is made utilized protonic-exchange technology. 34. The optical device of claim 1, wherein the optical device is made utilizing etching technology. 35. The optical device of claim 1, wherein the optical device is made utilizing milling technology. 36. The optical device of claim 1, wherein the optical device is made utilizing CVD technology. 37. The optical device of claim 1, further comprising: a substrate. 38. The optical device of claim 37, wherein the substrate is coated with a buffer layer. 39. The optical device of claim 38, wherein the buffer layer is silicon dioxide. 40. The optical device of claim 1, further comprising: a first analog-to-digital converter and a digital signal processing unit, wherein the digital processing unit performs calibration of the optical device. 41. The optical device of claim 11, wherein the digital signal processing unit is adapted to control the first coupler, the second coupler, the third coupler, the fourth coupler, the first phase shifter, and the second phase shifter.