Wavelength-selective 1×N2 switches with two-dimensional input/output fiber arrays

• US 7,072,539 B2
• Filed: 02/07/2005
• Issued: 07/04/2006
• Est. Priority Date: 08/08/2002
• Status: Active Grant

• Current Assignee: Regents of the University of California (University of California)
• Original Assignee: Regents of the University of California (University of California)
• Inventors: Tsai, Jui-Che, Wu, Ming-Chiang
• Primary Examiner(s): KANG, JULIANA K
• Application Number:
  US11/053,182
• Publication Number:
  US 20050213877A1
• Time in Patent Office: 512 Days
• Field of Search: 385/18
• US Class Current: 385/18
• CPC Class Codes: G02B 6/2931 Diffractive element operating in reflection
• CPC Class Codes: G02B 6/29311 Diffractive element operating in transmission
• CPC Class Codes: G02B 6/29313 characterised by means for controlling the position or direction of light incident to or leaving the diffractive element, e.g. for varying the wavelength response switching G02B6/35
• CPC Class Codes: G02B 6/29383 Adding and dropping
• CPC Class Codes: G02B 6/3512 the optical element being reflective, e.g. mirror
• 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 6/3558 1xN switch, i.e. one input and a selectable single output of N possible outputs
• 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

Abstract

A 1×N² wavelength selective switch (WSS) configuration in which switch elements are configured in a way that enables the input or output fibers to be arranged in a two-dimensional (2D) array. By employing 2D arrays of input/output channels, the channel count is increased from N to N² for wavelength selective switches. In one embodiment, in which the components are arranged as a 2-f imaging system, a one-dimensional (1D) array of mirrors is configured such that each mirror has a dual scanning axis (i.e., each mirror can be scanned in X and Y directions). In another embodiment, in which the components are arranged as a 4-f imaging system, two 1D arrays of mirrors are configured with orthogonal scanning directions. In both embodiments, the number of ports is increased from N to N².

Claims

1. An optical switch, comprising:

a two-dimensional array of optical ports;

an input port within said two-dimensional array of optical ports configured for communicating an optical beam containing multiple wavelengths;

a plurality of output ports within said two-dimensional array of optical ports; and

a first one-dimensional array of single-axis actuated mirrors; and

a second one-dimensional array of single-axis actuated mirrors configured with a scanning direction that is orthogonal to said first one-dimensional array;

wherein said first and second one-dimensional arrays of actuated mirrors are configured for switching the optical beam from said input port to an output port in said two-dimensional array of optical ports.

2. An optical switch as recited in claim 1, further comprising at least one imaging component configured for positioning said optical beam onto said first and/or said second array of actuated mirrors.

3. An optical switch as recited in claim 2, wherein at least one imaging component comprises at least one lens.

4. An optical switch as recited in claim 1, further comprising:

a wavelength dispersive element;

wherein said wavelength dispersive element is configured for separating at least one wavelength component in said optical beam from at least one other wavelength component in said optical beam; and

wherein said optical switch is configured for switching said at least one wavelength component from said input port to said output port.

5. An optical switch as recited in claim 1, further comprising means for collimating optical beams in said optical switch.

6. An optical switch as recited in claim 5, wherein said means for collimating optical beams in said optical switch comprises a monolithic two-dimensional collimator array.

7. An optical switch, comprising:

a two-dimensional array of optical ports;

an input port within said two-dimensional array of optical ports configured for communicating an optical beam containing multiple wavelengths;

a plurality of output ports within said two-dimensional array of optical ports;

a first one-dimensional array of single-axis actuated mirrors;

a second one-dimensional array of single-axis actuated mirrors configured having a scanning direction orthogonal to said first one-dimensional array; and

means for positioning said optical beam onto said array of actuated mirrors;

wherein said first and second one-dimensional arrays of actuated mirrors are configured for switching the optical beam from said input port to an output port in said two-dimensional array of optical ports.

8. An optical switch as recited in claim 7, wherein said means for positioning comprises:

a first lens; and

a second lens;

wherein said first and second lenses and said first and second arrays of actuated mirrors are arranged in a 4-f confocal configuration within said optical switch.

9. An optical switch as recited in claim 7, wherein said means for positioning comprises at least one lens.

10. An optical switch as recited in claim 7, further comprising telescopic means for expanding the optical beams from said two-dimensional array of optical ports.

11. An optical switch as recited in claim 7, further comprising means for collimating optical beams in said optical switch.

12. An optical switch as recited in claim 7, further comprising:

a wavelength dispersive element;

wherein said wavelength dispersive element is configured for separating at least one wavelength component in said optical beam from at least one other wavelength component in said optical beam; and

wherein said optical switch is configured for switching said at least one wavelength component from said input port to said output port.

13. An optical switch as recited in claim 7, further comprising means for collimating optical beams in said optical switch.

14. An optical switch as recited in claim 13, wherein said means for collimating optical beams in said optical switch comprises a monolithic two-dimensional collimator array.

15. An optical switch, comprising:

a two-dimensional array of optical ports;

an input port within said two-dimensional array of optical ports configured for communicating an optical beam containing multiple wavelengths;

a plurality of output ports within said two-dimensional array of optical ports;

a first array of actuated mirrors;

a second array of actuated mirrors;

means for directing said optical beam onto said first and second array of actuated mirrors; and

means for spatially dispersing wavelengths within said optical beam;

wherein said first array of mirrors are configured for single-axis rotation about a first axis;

wherein said second array of mirrors are configured for single-axis rotation about a second axis that is orthogonal to said first axis; and

wherein said arrays of actuated mirrors are configured for switching an optical beam from said input port through said means for positioning and said means for spatially dispersing to steer desired wavelengths within said optical beam to an output port in said two-dimensional array of output ports.

16. An optical switch as recited in claim 15, wherein said means for directing said optical beam and said means for spatially dispersing wavelengths, are positioned confocally between said first and second arrays of actuated mirrors.

17. An optical switch as recited in claim 16, wherein said means for directing said optical beam comprises:

a first lens; and

a second lens;

wherein said first and second lenses and said first and second arrays of actuated mirrors are arranged in a 4-f confocal configuration within said optical switch.

18. An optical switch as recited in claim 15, wherein said means for directing said optical beam comprises an imaging component configured for positioning said optical beam onto said first array of actuated mirrors.

19. An optical switch as recited in claim 18, wherein said imaging component comprises a lens.

20. An optical switch as recited in claim 15, further comprising an imaging component configured for positioning said optical beam onto said second array of actuated mirrors.

21. An optical switch as recited in claim 20, wherein said imaging component comprises a lens.

22. An optical switch as recited in claim 15, wherein said means for spatially dispersing wavelengths comprises:

a wavelength dispersive element;

wherein said wavelength dispersive element is configured for separating at least one wavelength component in said optical beam from at least one other wavelength component in said optical beam; and

wherein said optical switch is configured for switching said at least one wavelength component from said input port to said output port.

23. An optical switch as recited in claim 22, wherein said means for directing said optical beam comprises:

a first lens positioned between said wavelength dispersive element and said first array of actuated mirrors; and

a second lens positioned between said wavelength dispersive element and said second array of actuated mirrors;

wherein said arrays of actuated mirrors, said lenses and said wavelength dispersive element are arranged in a 4-f confocal configuration within said optical switch.

24. An optical switch as recited in claim 23, wherein said wavelength dispersive element comprises a grating.

25. An optical switch as recited in claim 15, further comprising means for collimating optical beams in said optical switch.

26. An optical switch as recited in claim 25, wherein said means for collimating optical beams in said optical switch comprises a monolithic two-dimensional collimator array.

27. An optical switch, comprising:

a two-dimensional array of optical ports, each of said optical ports configured for communicating multiple wavelength channels;

an input port within said two-dimensional array of optical ports;

an output port within said two-dimensional array of optical ports;

a first one-dimensional array of single-axis actuated mirrors;

a second one-dimensional array of single-axis actuated mirrors configured with a scanning direction that is orthogonal to said first one-dimensional array;

a first lens;

a second lens;

wherein said first and second lens are confocal and configured for positioning said optical beam onto said arrays of actuated mirrors; and

a wavelength dispersive element configured for spatially dispersing the optical wavelengths within an optical beam;

wherein said array of mirrors is configured to switch an optical beam on an input channel to a port in said two-dimensional array of ports.

28. An optical switch as recited in claim 27, wherein said lenses and said wavelength dispersive element are positioned between said first array of actuated mirrors and said second array of actuated mirrors.

29. An optical switch as recited in claim 28, wherein said wavelength dispersive element is positioned intermediate said first lens and said second lens.

30. An optical switch as recited in claim 29:

wherein said first and second mirror arrays are separated in a 4-f confocal arrangement;

wherein said first lens is confocally positioned 1-f from said first mirror array and 3-f from said second mirror array;

wherein said second lens is confocally positioned 3-f from said first mirror array and 1-f from said second mirror array; and

wherein said wavelength dispersive element is confocally positioned 2-f from both said first mirror array and said second mirror array.

31. An optical switch as recited in claim 30:

wherein said 4-f confocal arrangement is configured to direct the optical beam focused on any mirror in said first array to a corresponding mirror in said second array, and to direct the optical beam focused on any mirror in said second array to a corresponding mirror in said first array; and

wherein said optical beams are directed between corresponding mirrors in said first and second mirror arrays without regard to the tilting angle of the mirrors.

32. An optical switch as recited in claim 27, further comprising telescopic means for expanding the optical beams from said two-dimensional array of optical ports.

33. An optical switch as recited in claim 27, wherein said two-dimensional array of optical ports is configured with a pitch of approximately 1 mm.

34. An optical switch as recited in claim 27:

wherein said optical beam has a radius on the order of 125 micrometers;

wherein said telescopic means comprises a telescope with magnification on the order of 6×

;

wherein said wavelength dispersive element comprises a grating with groove spacing on the order of approximately 600 grooves per millimeter; and

wherein said first and second lenses have a focal length f on the order of 15 centimeters.

35. An optical switch as recited in claim 27, wherein said two-dimensional array of optical ports is configured as an N² array of optical ports.

36. An optical switch as recited in claim 27:

wherein said wavelength dispersive element is configured for separating at least one wavelength component in said optical beam from at least one other wavelength component in said optical beam; and

wherein said optical switch is configured for switching said at least one wavelength component from said input port to said output port.

37. An optical switch as recited in claim 31, wherein said arrays of actuated mirrors, said lenses and said wavelength dispersive element are arranged in a 4-f confocal configuration within said optical switch.

38. An optical switch as recited in claim 27, further comprising means for collimating optical beams in said optical switch.

39. An optical switch as recited in claim 38, wherein said means for collimating optical beams in said optical switch comprises a monolithic two-dimensional collimator array.