Bridging apparatus and method for an optical crossconnect device

• US 5,982,554 A
• Filed: 12/31/1997
• Issued: 11/09/1999
• Est. Priority Date: 12/31/1997
• Status: Expired due to Term

• Current Assignee: AT&T Corporation (AT&T, Inc.), AT&T Wireless Services Incorporated (AT&T, Inc.)
• Original Assignee: AT&T Corporation (AT&T, Inc.)
• Inventors: Goldstein, Evan Lee, Lin, Lih-Yuan, Simmons, Jane Marie
• Primary Examiner(s): Epps, Georgia
• Assistant Examiner(s): SEYRAFI, SAEED HMT
• Application Number:
  US09/001,675
• Time in Patent Office: 678 Days
• Field of Search: 359/629, 359/627, 359/618, 359/628
• US Class Current: 359/629
• CPC Class Codes: G02B 6/2817 using reflective elements to split or combine optical signals
• CPC Class Codes: G02B 6/3512 the optical element being reflective, e.g. mirror
• CPC Class Codes: G02B 6/3546 NxM switch, i.e. a regular array of switches elements of matrix type constellation
• CPC Class Codes: G02B 6/356 in an optical cross-connect device, e.g. routing and switching aspects of interconnecting different paths propagating different wavelengths to (re)configure the various input and output links switching polarized beams G02B6/3594; power equalizers G02B6/356 and G02B6/3594; path selecting means H04Q11/0001
• CPC Class Codes: G02B 6/3562 Switch of the bypass type, i.e. enabling a change of path in a network, e.g. to bypass a failed element in the network
• CPC Class Codes: H04Q 11/0005 Switch and router aspects
• CPC Class Codes: H04Q 2011/0015 using splitting combining
• CPC Class Codes: H04Q 2011/0026 using free space propagation (e.g. lenses, mirrors)
• CPC Class Codes: H04Q 2011/0043 Fault tolerance

Abstract

A bridging apparatus is used with an optical matrix crossconnect mechanism that has an array of reflective panels that are disposed in a plurality of columns and rows and are selectively operative between reflective states and non-reflective states. The bridging apparatus includes at least one light beam splitting device that is peripherally disposed in the array of reflective panels adjacent to an entry position of a light beam. The at least one light beam splitting device is operative in a retracted state to permit the light beam to enter into the optical matrix crossconnect mechanism in an undivided manner. The at least one light beam splitting device is operative in a beam splitting state so that the light beam entering into the optical matrix crossconnect mechanism can be divided into a first light beam portion and a second light beam portion which are directed into the optical matrix crossconnect mechanism in different directions.

Claims

1. An optical matrix crossconnect mechanism comprising:

at least one reflective panel disposed in an array of a plurality of columns and rows, each reflective panel being selectively operative between a reflective state and a non-reflective state; and

a bridging apparatus including at least one light beam splitting device disposed in the array, the at least one light beam splitting device operative in a retracted state wherein no portion of the light beam is reflected and a beam splitting state wherein the light beam is divided into a first light beam portion and a second light beam portion which are directed in different directions.

2. The optical matrix crossconnect mechanism according to claim 1, wherein the at least one light beam splitting device includes an actuator and a panel member movable between the retracted state and the beam splitting state by the actuator.

3. The optical matrix crossconnect mechanism according to claim 1, wherein the panel member is fabricated from a semi-transparent, semi-reflective material.

4. The optical matrix crossconnect mechanism according to claim 3, wherein the semi-transparent, semi-reflective material reflects approximately 50% of the light beam and permits approximately 50% of the light beam to pass through the beam splitting device.

5. The optical matrix crossconnect mechanism according to claim 1, wherein at least one of the reflective panels is disposed adjacent at least one light beam splitting device in one of a row and a column.

6. An optical matrix crossconnect mechanism comprising:

at least one reflective panel disposed in an array of a plurality of columns and rows, each reflective panel being selectively operative between a reflective state and a non-reflective state; and

a bridging apparatus including a first series of at least one first light beam splitting device and at least one first bridging reflective panel, the first series arranged in the array, in a selected column or in a selected row, the at least one first light beam splitting device being movable between a retracted state permitting the light beam to remain undivided and a beam splitting state dividing the light beam into a first light beam portion and a second light beam portion directed in different directions.

7. The optical matrix crossconnect mechanism according to claim 6, further comprising a second series of at least one second light beam splitting device and a plurality of second bridging reflective panels disposed in optical alignment parallel to the first series for selectively dividing a second light beam.

8. The optical matrix crossconnect mechanism according to claim 7, wherein the at least one first light beam splitting device and the at least one second light beam splitting device are offset from one another while being in optical alignment with respective ones of reflective panels.

9. The optical matrix crossconnect mechanism according to claim 6, wherein in at least one second light beam portion is directed to at least one bridging reflective panel in a bridging reflective state.

10. A method for simultaneously providing two output light signals from a single input light signal inputted into an array comprising at least one reflective panel disposed in a plurality of columns and rows, each reflective panel being selectively operative between a reflective state and a non-reflective state, the method comprising the steps of:

splitting the input light signal into a first light signal portion and a second light signal portion;

directing the first light signal portion in a first direction and the second light signal portion into a second direction different from the first direction; and

receiving the first light signal portion at a first light signal output port and the second light signal portion at a second light signal output port different from the first light signal output port.

11. The method according to claim 10, wherein the step of splitting comprises a step of switching at least one light beam splitting device between a retracted state wherein no portion of the light beam is reflected and a beam splitting state wherein the light beam is divided into the first light signal portion and the second light signal portion.

12. The method according to claim 10, further comprising a step of reflecting the second light signal portion by switching at least one light beam reflective panel between a retracted state wherein the second light signal portion is not reflected and a reflective state wherein the second light signal portion is reflected.

13. The method according to claim 10, further comprising the steps of:

inputting a second input light signal,

splitting the second input light signal into a third light signal portion and a fourth light signal portion;

directing the third light signal portion in a third direction and the fourth light signal portion into a fourth direction different from the third direction.

14. The method according to claim 13, wherein, the first and the third directions are parallel to each other and the second and fourth directions are parallel to each other.