Using an asymmetric element to create a 1XN optical switch

• US 5,774,604 A
• Filed: 10/23/1996
• Issued: 06/30/1998
• Est. Priority Date: 10/23/1996
• Status: Expired due to Fees

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: McDonald, Terrance G.
• Primary Examiner(s): Bovernick, Rodney B.
• Assistant Examiner(s): Sanghavi, Hemang
• Application Number:
  US08/735,630
• Time in Patent Office: 615 Days
• Field of Search: 385/18, 385/19, 385/20, 385/22, 385/14, 385/47, 385/24, 359/223, 359/225, 359/226, 359/230, 359/846, 359/847, 359/848, 359/850, 359/855, 359/865
• US Class Current: 385/18
• CPC Class Codes: G02B 6/3512 the optical element being reflective, e.g. mirror
• CPC Class Codes: G02B 6/352 the reflective optical element having a shaped reflective surface, e.g. a reflective element comprising several reflective surfaces or facets that function together
• CPC Class Codes: G02B 6/3548 1xN switch, i.e. one input and a selectable single output of N possible outputs
• CPC Class Codes: G02B 6/357 Electrostatic force electrostatic forces controlling reflecting elements in general G02B26/0841

Abstract

An architecture for a compact, 1×N optical switch. The switch package receives light from an input optical fiber (12b), which is directed over a well or gap at the bottom of which lies a micromechanical structure (10). If the structure is in an unaddressed state, the light travels into an in line output optical fiber (12a). If the structure (10) is in an addressed state, it intercepts the light and reflects it out of the plane of the input optical fiber to an offset mirror (24). The offset mirror (24) then reflects the light to one output fiber (16a, 16b). The offset mirror may have steps such that more than one optical fiber could become the output fiber, depending upon the structure'"'"'s position.

Claims

1. An optical switch for switching light between optical fibers, comprising:

an input optical fiber for bringing light into a switch package;

a micromechanical structure placed in said package such that light from said input optical fiber is transmitted over said structure when said structure is in an unaddressed state;

a first output optical fiber, wherein said first output fiber is positioned such that light is received by said first output fiber when said micromechanical structure is in said unaddressed state;

an offset mirror, wherein said offset mirror is positioned such that light is transmitted to and reflected off of said offset mirror when said micromechanical structure is in an addressed and deflected state, and wherein said offset mirror is stepped such that a different optical fiber receives said light depending upon the position of said micromechanical structure; and

at least one other optical output fiber for receiving light from said offset mirror, such that only one of said other output fibers receives said light at any one instant in time.

2. The optical switch as claimed in claim 1 wherein said micromechanical structure further comprises a landing electrode such that when said structure is in said addressed state, said structure comes into contact with said landing electrode.

3. The optical switch as claimed in claim 1 wherein said offset mirror further comprises a mirror with one reflective surface.

4. The optical switch as claimed in claim 1 wherein said micromechanical structure is mounted asymmetrically.

5. The optical switch as claimed in claim 1 wherein said micromechanical structure is mounted symmetrically.