Optical switch with moving lenses

• US 20020181836A1
• Filed: 06/01/2001
• Published: 12/05/2002
• Est. Priority Date: 06/01/2001
• Status: Active Grant

• Current Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Original Assignee: Agilent Technologies, Inc.
• Inventors: Lemoff, Brian E.
• Granted Patent: US 6,678,436 B2
• Time in Patent Office: Days
• US Class Current: 385/16
• CPC Class Codes: G02B 2006/12102 Lens
• 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 6/351 involving stationary waveguides with moving interposed optical elements G02B6/3538 takes precedence; interposed waveguides G02B6/3502
• CPC Class Codes: G02B 6/3524 the optical element being refractive
• CPC Class Codes: G02B 6/3526 the optical element being a lens
• CPC Class Codes: G02B 6/3534 the optical element being diffractive, i.e. a grating
• CPC Class Codes: G02B 6/3556 NxM switch, i.e. regular arrays of switches elements of matrix type constellation
• CPC Class Codes: G02B 6/3566 involving bending a beam, e.g. with cantilever
• CPC Class Codes: G02B 6/357 Electrostatic force electrostatic forces controlling reflecting elements in general G02B26/0841

Abstract

A planar array of lenses are configured and independently translatable along in-plane X and Y axes by corresponding MEMS actuators such that a light beam emanating from the facet of a first selected optical fiber in an adjacent bundle of fibers can be deflected in a first predetermined manner by a first one of the lenses, reflected off of an adjacent co-planar mirror back to the array of lenses, and deflected in a second predetermined manner by a second one of the lenses and focused on the facet of a selected second optical fiber in the bundle. In an alternate embodiment, the planar mirror is replaced with a second array of MEMS actuated lenses so that light pulses from a selected optical fiber in an input bundle can be steered to a selected optical fiber in an output bundle.

Claims

1. An optical switch, comprising:

a array of optical fibers having a plurality of facets lying in a first plane;

an array of lenses formed in a second plane spaced from, and generally parallel to, the first plane, there being one lens corresponding to each fiber for receiving and focusing light beams emanating from the array of optical fibers;

a plurality of actuators that each independently translate a corresponding lens a predetermined amount within the second plane along an X axis and a Y axis;

a mirror spaced from, and generally parallel to, the second plane; and

the lenses being configured and translatable by their actuators such that a light beam emanating from the facet of a first selected optical fiber in the array of optical fibers can be deflected in a first predetermined manner by a first one of the lenses, reflected off of the mirror back to the array of lenses, and deflected in a second predetermined manner by a second one of the lenses and focused on the facet of a second selected optical fiber.

2. The optical switch of claim 1 wherein the actuators are MEMS actuators.

3. The optical switch of claim 1 wherein each lens is a micro-lens fabricated with photolithographic techniques.

4. The optical switch of claim 1 wherein the lenses are diffractive optical elements.

5. The optical switch of claim 1 wherein the lenses are refractive optical elements.

6. The optical switch of claim 1 wherein the lenses are separately formed before being attached to a silicon substrate.

7. The optical switch of claim 1 wherein the actuators are formed with polymers.

8. The optical switch of claim 1 wherein the actuators are selected from the group consisting of piezo-electric transducers, electrostatic comb drives and MEMS micro-steppers.

9. The optical switch of claim 1 wherein the lenses and the actuators are both formed together as MEMS surface micro-machines.

10. The optical switch of claim 1 wherein the lenses are selected from the group consisting of a diffractive Fresnel zone-plate micro-lens, a diffractive multiple-level binary micro-lens and a refractive micro-lens.

11. An optical switch, comprising:

a first array of optical fibers having a plurality of facets lying in a first plane;

a first array of lenses formed in a second plane spaced from, and generally parallel to, the first plane, there being one lens in the first array of lenses corresponding to each fiber of the first array of fibers for receiving and focusing light beams emanating from the first array of optical fibers;

a first plurality of actuators that each independently translate a corresponding lens of the first array a predetermined amount within the second plane along an X axis and a Y axis of the second plane;

a second array of lenses formed in a third plane spaced from, and generally parallel to, the second plane;

a second plurality of actuators that each independently translate a corresponding lens of the second array a predetermined amount within the third plane along an X axis and a Y axis of the third plane;

a second array of optical fibers having a plurality of facets lying in a fourth plane spaced from, and generally parallel to, the third plane; and

the lenses of the first and second arrays being configured and translatable by their actuators such that a light beam emanating from the facet of a first selected optical fiber in the first array of optical fibers can be deflected in a first predetermined manner by a first lens in the first array of lenses and focused on a second lens in the second array of lenses, and deflected in a second predetermined manner by the second lens and focused on the facet of a second selected optical fiber in the second array of optical fibers.

12. The optical switch of claim 11 wherein the actuators are MEMS actuators.

13. The optical switch of claim 11 wherein each lens is a Fresnel zone-plate lens.

14. The optical switch of claim 11 wherein the lenses are diffractive optical elements.

15. The optical switch of claim 11 wherein the lenses are refractive optical elements.

16. The optical switch of claim 11 wherein the lenses are separately formed before being attached to a silicon substrate.

17. The optical switch of claim 11 wherein the actuators are formed with polymers.

18. The optical switch of claim 11 wherein the actuators are selected from the group consisting of piezo-electric transducers, electrostatic comb drives and MEMS micro-steppers.

19. The optical switch of claim 11 wherein the lenses and the actuators of each corresponding array are both formed together as MEMS surface micro-machines.

20. The optical switch of claim 11 wherein the first and second arrays of optical fibers have an equal number of optical fibers.

21. An optical switch, comprising:

an input optical fiber;

a first lens positioned to receive and focus a light beam emanating from the input optical fiber;

a first actuator that translates the first lens along an X axis and a Y axis of a first plane,

an array of second lenses spaced from the first lens and lying in a second plane generally parallel to the first plane;

a second plurality of actuators that each independently translate a corresponding second lens of the array a predetermined amount within the second plane along an X axis and a Y axis of the second plane;

an array of output optical fibers having a plurality of facets lying in a third plane spaced from, and generally parallel to, the second plane; and

the lenses being configured and translatable by their actuators such that a light beam emanating from a facet of the input optical fiber can be deflected in a first predetermined manner by the first lens and focused on a selected second lens in array of lenses, and deflected in a second predetermined manner by the selected second lens and focused on the facet of a selected output optical fiber.