Device for optically coupling a plurality of first optical waveguides to a plurality of second optical waveguides

• US 5,357,590 A
• Filed: 04/07/1993
• Issued: 10/18/1994
• Est. Priority Date: 04/16/1992
• Status: Expired due to Fees

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Auracher, Franz
• Primary Examiner(s): Healy, Brian
• Application Number:
  US08/043,813
• Time in Patent Office: 559 Days
• Field of Search: 385/31, 385/33, 385/35, 385/38, 385/49, 385/50, 385/52, 385/74, 385/88, 385/89, 385/92, 385/93, 385/14, 385/129, 385/130, 385/131, 385/132
• US Class Current: 385/33
• CPC Class Codes: G02B 6/30 for use between fibre and thin-film device
• CPC Class Codes: G02B 6/32 having lens focusing means positioned between opposed fibre ends with lens being an integral part of the single fibre end G02B6/262
• CPC Class Codes: G02B 6/322 and having centering means being part of the lens for the self-positioning of the lightguide at the focal point, e.g. holes, wells, indents, nibs
• CPC Class Codes: G02B 6/42 Coupling light guides with opto-electronic elements
• CPC Class Codes: G02B 6/4204 the coupling comprising intermediate optical elements, e.g. lenses, holograms encapsulated active devices H01S5/02208, H01L33/52

Abstract

A device, which provides a high positioning precision and good coupling efficiency for producing an optical coupling between a plurality of first optical waveguides having one spot diameter and a plurality of second optical waveguides having a different spot diameter, comprises optical lenses and a plate arranged between the end faces of the first and second waveguides lying opposite to one another, the plate has one flat surface facing toward the first waveguides and a second flat surface facing toward the second waveguides, the plate having an arrangement for positioning an optical lens between each pair of waveguides. The optical lenses may be planar lenses formed on a flat surface of the plate or may be spherical lenses held in conical depressions on one of the surfaces of the plate. In one embodiment, the plate has depressions on both sides, which may receive spherical lenses. In the arrangement with the planar lenses, the opposite side may be free of depressions or have depressions for receiving optical fibers forming one of the groups of waveguides.

Claims

1. In a device for producing an optical coupling between a plurality of first waveguides and a plurality of second waveguides, wherein the first and second waveguides have end faces which lie opposite one another in pairs and are arranged at a distance from one another and wherein optical lenses are arranged between every pair of the end faces of the first and second waveguides lying opposite one another, the improvement comprising a carrier member being formed of a plate arranged between the end faces of the first and second waveguides which lie opposite to one another, said plate having one flat surface facing toward the first waveguides and one flat surface facing toward the second waveguides, and the plate having means on one surface for holding lenses between the pairs of end faces of the first and second waveguides, at least one of the plurality of first and second waveguides being waveguides of an IOC which are integrated on a substrate with end faces at a rim edge of the substrate, and the means for holding lenses being on a flat surface of the carrier facing toward the end faces of the waveguides at said rim edge.

2. In a device according to claim 1, wherein the lenses are spherical lenses and the means for holding lenses includes a depression conically tapering from the one surface toward the interior of the carrier member from a maximum diameter to a minimum diameter, said minimum diameter being greater than zero.

3. In a device according to claim 1, wherein the carrier member is composed of a material that is transparent to a wavelength of an optical wave being guided in the first and second waveguides, wherein the means for holding the lenses is a flat surface of the plate and each of the lenses is composed of a planar lens arranged on said flat surface of the plate.

4. In a device for producing an optical coupling between a plurality of first optical waveguides and a plurality of second optical waveguides, said device having end faces of the first and second waveguides lying opposite to one another in pairs and arranged at a distance from one another, and an optical lens being positioned between every pair of end faces of the first and second waveguides, said lenses being held on a carrier member in a region of a depression fashioned on a surface of the carrier member and conically tapering from the surface in a direction toward the inside of the carrier member from a maximum diameter to a minimum diameter, said minimum diameter being greater than zero, the improvements comprising the carrier member being composed of a plate arranged between the end faces of the first and second waveguides lying opposite one another, said plate having one flat surface facing toward the first waveguides and one flat surface facing toward the second waveguides, at least one of the plurality of first and second waveguides being waveguides of an IOC, which waveguides are integrated on a substrate and have said end faces at a rim edge of the substrate and the depressions for holding the lenses being fashioned in at least one of the flat surfaces of the plate, said at least one flat surface facing the end faces of the waveguide of the IOC and the depressions being conically tapering in diameter from the one flat surface in the direction toward the other flat surface of the plate.

5. In a device according to claim 4, wherein the plate is composed of a material that is transparent for a wavelength of an optical wave being guided in the first and second waveguides.

6. In a device according to claim 4, wherein the minimum diameter of each depression is situated at a distance from the flat surface of the plate, which is different from zero.

7. In a device according to claim 4, which has depressions extending inward from each of the flat surfaces and separated one from the other by a wall of material of the plate, said material of the plate being transparent for the wavelength of an optical wave being guided in the first and second waveguides, each of the depressions conically tapering in diameter from a maximum diameter inward to a minimum diameter, which is greater than zero.

8. In a device according to claim 7, wherein the minimum diameter of the depressions situated on one flat surface of the plate is different from the minimum diameter of the depressions situated on the other flat surface of the plate.

9. In a device according to claim 7, wherein the maximum diameter of the depressions situated on one surface of the plate is different from the maximum diameter of the depressions situated on the other surface of the plate.

10. In a device according to claim 7, wherein the lenses are spherical lenses and are arranged and held in the depressions situated on one of the flat surfaces of the plate.

11. In a device according to claim 7, wherein the lenses are spherical lenses which are arranged and held in both of the depressions situated on one flat surface of the plate, as well as the depressions situated on the other flat surface of the plate.

12. In a device according to claim 11, wherein the spherical lenses held in depressions having different diameters have different diameters.

13. In a device according to claim 4, wherein the depression is defined by a through opening from one flat side in the direction toward the other flat side of the plate, said depression conically tapering in the direction toward the other flat side from a maximum diameter to a minimum diameter and then conically expands in a direction as the depression continues toward the other flat side from the minimum diameter to the maximum diameter.

14. In a device according to claim 13, wherein the maximum diameter of the depressions on one side is different from that on the other side and the lenses are spherical lenses being received in each of said depressions forming the through hole with the diameters of the spherical lenses being different.

15. In a device according to claim 4, which includes adjustment means for the automatic adjustment of the end face of the first and second waveguides relative to the depressions and lenses.

16. In a device according to claim 15, wherein the adjustment means includes a fixing carrier member on which one of the first and second waveguides are secured in the same arrangement as the optical lenses and said adjustment means has adjustment projections and depressions which are fashioned on the plate and on the fixing carrier member, said projections and depressions engaging into one another when the plate and fixing carrier member are joined together.

17. In a device according to claim 16, wherein the carrier member and the fixing carrier member are both formed of anisotropically etchable material and the depressions and channels are produced with planar technology.

18. In a device according to claim 17, wherein the anisotropically etchable material is composed of silicon.

19. In a device for producing an optical coupling between first optical waveguides and a plurality of second optical waveguides, said first and second waveguides having end faces that lie opposite to one another in pairs and being arranged at a distance from one another, and wherein optical lenses are held on a carrier member and are arranged between every pair of end faces of the first and second waveguides lying opposite one another, the improvements comprising the carrier member being composed of a plate arranged between the end faces of the first and second waveguides lying opposite one another, said plate having one flat surface facing toward the first waveguides and one flat surface facing toward the second waveguides and being composed of a material that is transparent for a wavelength of the optical wave being guided in the first and second waveguides, and wherein every optical lens is composed of a planar lens arranged on at least one of the flat surfaces of the plate.

20. In a device according to claim 19, wherein the two flat surfaces of the plate are free of depressions.

21. In a device according to claim 19, wherein a depression is formed in the other flat surface of the plate opposite each planar lens, which is arranged on the first flat surface of the plate, said depression being conically tapered from a maximum diameter to a minimum diameter from the other flat surface toward the first flat surface.

22. In a device according to claim 21, wherein each waveguide adjacent the depressions in an optical fiber with an outside diameter, and the maximum diameter of the depression is greater than the outside diameter of the optical fiber being received in said depression and the minimum diameter of the depression is≦

the outside diameter of the optical fiber.

23. In a device according to claim 19, which includes adjustment means for the automatic adjustment of the end faces of the first and second waveguides relative to the optical lenses.

24. In a device according to claim 23, wherein the adjustment means comprises a fixing carrier member for supporting one of the first and second waveguides in the same arrangement as the optical lenses on the carrier member, said carrier member and fixing carrier member having adjustment projections and depressions engaging one another when the fixing carrier member is joined to the carrier member.