Wavelength selective cross-connect switch using a MEMS shutter array

• US 6,535,311 B1
• Filed: 12/09/1999
• Issued: 03/18/2003
• Est. Priority Date: 12/09/1999
• Status: Expired due to Fees

• Current Assignee: Corning Incorporated
• Original Assignee: Corning Incorporated
• Inventors: Lindquist, Robert G.
• Primary Examiner(s): Pascal, Leslie
• Assistant Examiner(s): Phan, Hanh
• Application Number:
  US09/458,560
• Time in Patent Office: 1,195 Days
• Field of Search: 359/127, 359/128, 359/130, 359/134, 359/122, 359/117, 359/139, 359/246, 359/494, 359/495, 359/497, 359/499, 385/11, 385/17, 385/18, 385/24, 385/16, 385/37
• US Class Current: 398/82
• CPC Class Codes: G02B 6/35 having switching means by changing the optical properties of the medium G02F1/00
• CPC Class Codes: G02B 6/3514 the reflective optical element moving along a line so as to translate into and out of the beam path, i.e. across the beam path
• CPC Class Codes: G02B 6/3518 the reflective optical element being an intrinsic part of a MEMS device, i.e. fabricated together with the MEMS device MEMS devices in general B81B; manufacture of MEM devices in general B81C; micromechanical devices controlling the direction of light G02B26/0833
• 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 6/357 Electrostatic force electrostatic forces controlling reflecting elements in general G02B26/0841
• CPC Class Codes: G02B 6/3576 Temperature or heat actuation thermal forces controlling reflecting elements in general G02B26/0866; thermo-optic devices G02F1/0147
• CPC Class Codes: G02B 6/3592 Means for removing polarization dependence of the switching means, i.e. polarization insensitive switching light guides coupling with polarization selective and adjusting means G02B6/27

Abstract

A wavelength selective cross-connect switch for selectively switching wavelength-separated input channels between two optical input signals. The cross-connect switch includes two dispersive elements, where each dispersive element receives an optical input signal and disperses it into a plurality of wavelength-separated input channels. The cross-connect switch also includes a switching array mechanism, such as a micro-electro mechanical system (MEMS) shutter array, receiving the plurality of wavelength-separated input channels from each of the dispersive elements and operative for selectively switching one or more of the wavelength-separated input channels between the optical signals.

Claims

1. An optical switch having two dispersive elements for selectively switching wavelength channels between two optical signals, each of the two dispersive elements receiving an optical input signal and dispersing the optical input signal into a plurality of wavelength-separated input channels, the optical switch comprising:

a micro-electro mechanical shutter array for receiving the plurality of wavelength-separated input channels from each of the two dispersive elements, the micro-electro mechanical shutter operative for selectively switching one or more of the plurality of wavelength-separated input channels between the two optical signals.

2. The optical switch of claim 1 wherein the micro-electro mechanical shutter array includes a movable switching element for each of the wavelength-separated input channels, the movable switching element receiving an input beam from each of the two dispersive elements, the input beam corresponding to one of the plurality of wavelength-separated input channels.

3. The optical switch of claim 2 wherein the movable switching element is selectively movable between an open position and a closed position, whereby the movable switching element passes the input beam from one of the plurality of wavelength-separated input channels to a first output channel when in an open position and reflects the input beam to a second output channel when in a closed position.

4. The optical switch of claim 3 wherein the movable switching element includes a reflecting member and an actuator.

5. The optical switch of claim 4 wherein the reflecting member is a MEMS movable mirror.

6. The optical switch of claim 4 wherein the actuator is selected from a group consisting of a thermal actuator, an electro-static actuator, a comb drive actuator, or a scratch drive actuator.

7. The optical switch of claim 1 further comprising:

a focusing lens positioned between the micro-electro mechanical shutter array and the two dispersive elements.

8. The optical switch of claim 1 wherein the optical input signals have different polarization components, the optical switch further comprising:

a polarization dispersive element for spatially separating the different polarization components of each of the optical input signals.

9. An optical switch for selectively switching wavelength channels between two optical signals comprising:

a first dispersive element receiving a first optical input signal and dispersing the first optical input signal into a plurality of first wavelength-separated input channels;

a first focusing lens receiving the plurality of first wavelength-separated input channels;

a second dispersive element receiving a second optical input signal and dispersing the second optical signal into a plurality of second wavelength-separated input channels;

a second focusing lens receiving the plurality of second wavelength-separated input channels; and

a switching array mechanism between the first focusing element and the second focusing element for selectively switching the wavelength-separated input channels between the first optical input signal and second optical input signal.

10. The optical switch of claim 9 wherein the first dispersive element and the second dispersive element each comprise:

a diffraction grating.

11. The optical switch of claim 9 wherein the first focusing lens and the second focusing lens each have a focal length, the first focusing lens and the second focusing lens being positioned a distance away from the switching array mechanism substantially equal to the focal length.

12. The optical switch of claim 9 wherein the switching array mechanism comprises:

a micro-electro mechanical shutter array.

13. The optical switch of claim 9 wherein the switching array mechanism includes a movable switching element for each of the wavelength-separated input channels, the movable switching element selectively movable between an open position and a closed position such that the movable switching element passes an input beam from one of the plurality of wavelength-separated input channels to a first output channel in an open position and reflects the input beam to a second output channel in a closed position.

14. The optical switch of claim 13 wherein the movable switching elements includes a reflecting member and an actuator.

15. The optical switch of claim 14 wherein the reflecting member is a MEMS movable mirror.

16. The optical switch of claim 14 wherein the actuator is selected from a group consisting of a thermal actuator, an electro-static actuator, a comb drive actuator, or a scratch drive actuator.

17. The optical switch of claim 9 wherein the optical input signals have different polarization components, the optical switch further comprising:

a polarization dispersive element positioned prior to the first dispersive element for spatially separating the different polarization components of the first optical input signal.