Method and apparatus for latched bimorph optical switchs

• US 6,394,617 B1
• Filed: 12/29/2000
• Issued: 05/28/2002
• Est. Priority Date: 12/29/2000
• Status: Expired due to Term

• Current Assignee: II-VI Delaware, Inc. (Coherent Corp.)
• Original Assignee: Avanex Corporation (Oclaro (North America), Inc.)
• Inventors: Wu, Shudong
• Primary Examiner(s): SIKDER, MOHAMMAD YUNUS
• Application Number:
  US09/752,177
• Time in Patent Office: 515 Days
• Field of Search: 359/877,878,223,224,225,226,115,138,139,871,872
• US Class Current: 359/877
• CPC Class Codes: G02B 6/3528 the optical element being a prism
• CPC Class Codes: G02B 6/3546 NxM switch, i.e. a regular array 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 6/3578 Piezoelectric force piezoelectric forces controlling reflecting elements in general G02B26/0858; piezo-optic devices G02F1/0131
• CPC Class Codes: G02B 6/358 Latching of the moving element, i.e. maintaining or holding the moving element in place once operation has been performed; includes a mechanically bistable system

Abstract

The present invention provides a method and apparatus for compact, high-speed, latched optical switching devices utilizing bimorph piezoelectric material. The apparatus employs an optical switching prism, that is capable of interchanging two parallel beams, to construct a 2×2 optical switch. In order to construct compact and high-speed switches, the prism has to be small and light-weigh, thus, the separation of the two parallel beams becomes small. A pair of reflection corner mirror capable of separating these two close parallel beams is used. The switching is performed by vertically inserting the prism into the optical path and only less than one millimeter (limited by the beam size) movement is required. Because the switching is based on beam deflection instead of reflection, it is not vulnerable to vibration.

Claims

1. An optical switching system, comprising:

a first reflective element and a second reflective element, where the first reflecting element is opposite the second reflecting element;

at least two collimators where the first collimator is proximately located to the first reflective element and the second collimator is proximately located to the second reflective element;

an optical apparatus switch for receiving an optical signal from one of the optical collimators and deflecting the optical signal to another collimators, wherein the optical apparatus comprises;

an arm comprising a piezoelectric material, the arm comprising a first and a second surface and a first and a second end, wherein the first surface is opposite to the second surface, wherein the first end if opposite to the second end;

an optical element mounted along the first surface of the arm;

a mounting element coupled to the first end of the arm for secure support of the end;

at least one object with a convex surface coupled to the second end of the arm;

a first magnet located opposite the first surface, in proximity to the second end of the arm;

a second magnet located opposite the second surface, in proximity to the second end of the arm; and

at least one electrode coupled to the arm to provide a voltage difference between the first and the second surface of the arm.

2. The switch of claim 1, wherein the collimators comprises:

at least one collimator proximately located near the first reflective element and directly in the path of one reflective surface; and

at least one collimator proximately located near the second reflective element and directly in the path of one reflective surface.

3. The switch of claim 1, wherein the reflective element comprises a mirror.

4. The apparatus of claim 1, wherein the arm comprises:

a first piezoelectric plate; and

a second piezoelectric plate couple to the first in parallel.

5. The apparatus of claim 1, wherein the optical element comprises a 2×

2 prism.

6. The apparatus of claim 1, wherein the optical element comprises a half-wave plate.

7. The apparatus of claim 1, wherein the support comprises;

a first support member coupled to the first end and the first surface of the arm; and

a second support member coupled to the first end and the second surface of the arm.

8. The apparatus of claim 1, wherein the object comprises:

a first metallic object coupled to the second end and the first surface of the arm; and

a second metallic object coupled to the second end and the second surface of the arm.

9. The apparatus of claim 1, wherein at least one electrode comprises:

a first electrode coupled to the first piezoelectric plate along its non-shared surface;

a second electrode coupled to the second piezoelectric plate along its non-shared surface; and

a third electrode implemented along the shared surface between the first and the second piezoelectric plates.