Method and computer aided apparatus for aligning large density fiber arrays

• US 6,614,517 B1
• Filed: 09/18/2001
• Issued: 09/02/2003
• Est. Priority Date: 09/18/2001
• Status: Expired due to Fees

• Current Assignee: Nayna Networks, Inc.
• Original Assignee: Nayna Networks, Inc.
• Inventors: Hallstein, Sascha, Aubuchon, Christopher
• Primary Examiner(s): Pham, Hoa Q.
• Assistant Examiner(s): Davis, Willie
• Application Number:
  US09/956,261
• Time in Patent Office: 714 Days
• Field of Search: 385/15-26, 700/95-212, 356/73.1, 356/364, 356/365, 356/124-127, 430/30
• US Class Current: 356/124
• CPC Class Codes: G02B 6/32 having lens focusing means positioned between opposed fibre ends with lens being an integral part of the single fibre end G02B6/262
• CPC Class Codes: G02B 6/3512 the optical element being reflective, e.g. mirror
• CPC Class Codes: G02B 6/3556 NxM switch, i.e. regular arrays of switches elements of matrix type constellation
• CPC Class Codes: G02B 6/3582 Housing means or package or arranging details of the switching elements, e.g. for thermal isolation
• CPC Class Codes: G02B 6/359 of the position of the moving element itself during switching, i.e. without monitoring the switched beams
• CPC Class Codes: G02B 6/3664 2D cross sectional arrangements of the fibres

Abstract

A method (and system) for manufacturing an optical switching device. The method includes forming an array plate comprising at least one hundred sites from a first physical process, where each of the sites is for coupling to an optical fiber. The sites have a first spatial degree of error relative to an ideal mathematical grid of the sites. The first spatial degree of error is derived from at least the first physical process. The method forms a lens plate comprising a plurality of lenses from a second physical process. Each of the lenses is going to be coupled to at least one of the sites on the array plate. The lenses have a second spatial degree of error relative to a second mathematical grid of lenses. The second spatial degree of error is derived from at least the second physical process. The method then derives lens measurement values from each of the plurality of lenses. The method compares each of the site measurement values with its respective lens measurement value to determine an error measurement between the lens measurement values and the respective site measurement values at a first reference point. The method then shifts the site measurement values relative to the lens measurement values by a selected increment relative to the first reference point. The selected increment is an x-direction, a y-direction, or a theta direction, or any combination of these. The method repeats the comparing to derive an other error measurement after the site measurement values have been shifted and continuing to perform the comparing and shifting in an iterative manner to reduce and/or possibly minimize the error measurement between the site measurement values with its respective lens measurement values.

Claims

1. A method for manufacturing an optical switching device, the method comprising:

forming an array plate comprising at least one hundred sites from a first physical process, each of the sites to be coupled to an optical fiber, the sites having a first spatial degree of error relative to a perfect mathematical grid of the sites, the first spatial degree of error being derived from at least the first physical process;

deriving site measurement values from each of the sites and transferring site measurement values for each of the sites into a memory location;

forming a lens plate comprising a plurality of lenses from a second physical process, each of the lenses to be coupled to at least one of the sites on the array plate, the plurality of lenses having a second spatial degree of error relative to a second perfect mathematical grid of lenses, the second spatial degree of error being derived from at least the second physical process;

deriving lens measurement values from each of the plurality of lenses and transferring the lens measurement values for each of the sites into the memory location;

comparing each of the site measurement values with its respective lens measurement value to determine an error measurement between the lens measurement values and the respective site measurement values at a first reference point;

shifting the site measurement values relative to the lens measurement values by a selected increment relative to the first reference point, the selected increment being either an x-direction, a y-direction, or a theta direction;

repeating the comparing to derive an other error measurement after the site measurement values have been shifted and continuing to perform the comparing and shifting in an iterative manner to reduce the error measurement between the site measurement values with its respective lens measurement values;

determining a minimum error measurement based upon the repeated comparing and shifting, the minimum error measurement being relative to the first reference point; and

coupling the array plate with the plurality of lenses by aligning the array plate to the plurality of lenses such that the site measurement values and the lens measurement values are arranged in a manner where the error measurement is at the minimum error measurement.

2. The method of claim 1 wherein the first mathematical grid of lenses and the second mathematical grid of array are the same.

3. The method of claim 1 where the minimum error measurement is less than five microns.

4. The method of claim 1 wherein the memory is provided in a computing device.

5. The method of claim 1 wherein the first spatial degree of error is less than eight micron.

6. The method of claim 1 wherein the array plate is made of a silicon bearing material.

7. The method of claim 1 wherein plurality of lenses is made of a silicon dioxide bearing material.

8. The method of claim 1 wherein the array plate and the plurality of lenses are made of a material that is substantially the same thermal expansivity.

9. The method of claim 1 wherein the deriving, comparing, shifting repeating, and determining are provided on a computing device.

10. The method of claim 1 wherein the coupling mechanically couples the plurality of lenses to the array plate.