Multipitch optical fiber ribbon

• US 6,295,400 B1
• Filed: 10/11/1999
• Issued: 09/25/2001
• Est. Priority Date: 10/11/1999
• Status: Expired due to Term

• Current Assignee: Furukawa Electric North America Incorporated (Furukawa Electric Company Limited)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Shahid, Muhammed Afzal
• Primary Examiner(s): Spyrou, Cassandra
• Assistant Examiner(s): BOUTSIKARIS, LEONIDAS
• Application Number:
  US09/416,180
• Time in Patent Office: 715 Days
• Field of Search: 385/114, 385/112, 385/89, 385/121
• US Class Current: 385/114
• CPC Class Codes: G02B 6/3636 the mechanical coupling means being grooves G02B6/3652 takes precedence
• CPC Class Codes: G02B 6/3652 the additional structures being prepositioning mounting areas, allowing only movement in one dimension, e.g. grooves, trenches or vias in the microbench surface, i.e. self aligning supporting carriers
• CPC Class Codes: G02B 6/368 with pitch conversion between input and output plane, e.g. for increasing packing density
• CPC Class Codes: G02B 6/4249 comprising arrays of active devices and fibres
• CPC Class Codes: G02B 6/4471 Terminating devices demountable connectors G02B6/3807; Cable clamps

Abstract

A multipitch optical fiber ribbon includes optical fibers that extend longitudinally and are laterally adjacent. The optical fibers are bonded together by bonding material having opposite first and second ends. A lateral first spacing is defined between adjacent optical fibers at the first end of the bonding material and a lateral second spacing is defined between adjacent optical fibers at the second end of the bonding material, and the first spacing is different from the second spacing. The bonding material includes a first segment at the first end of the bonding material and a second segment at the second end of the bonding material. The composition of the first segment of the bonding material can be the same as the composition of the second segment of the bonding material, or the first and second segments of the bonding material can have different compositions.

Claims

1. An optical fiber ribbon that can be readily connected between first and second arrays of optical receptacles, wherein the spacing in the first array is different from the spacing in the second array, the optical fiber ribbon comprising:

an array of a plurality of optical fibers that extend longitudinally and are laterally adjacent; and

bonding material having opposite first and second ends, wherein the bonding material bonds the optical fibers together at and between the first and second ends of the bonding material, and between the first and second ends of the bonding material the array is absent of splices between the optical fibers, and wherein;

the array comprises;

a longitudinally extending first segment extending from the first end of the bonding material toward the second end of the bonding material and terminating distant from the second end of the bonding material, and

a longitudinally extending second segment extending from the second end of the bonding material toward the first end of the bonding material and terminating proximate the first segment of the array and distant from the first end of the bonding material;

the bonding material comprises;

a longitudinally extending first bonding material that engages and bonds the optical fibers together along the first segment of the array, and

a longitudinally extending second bonding material that is different from the first bonding material, and that engages and bonds the optical fibers together along the second segment of the array; and

lateral spacing defined between adjacent optical fibers is substantially uniform throughout the first segment of the array and varies in the longitudinal direction in the second section of the array, wherein a lateral first spacing is defined between adjacent optical fibers at the first end of the bonding material, a lateral second spacing is defined between adjacent optical fibers at the second end of the bonding material, and the first spacing is different from the second spacing.

2. An optical fiber ribbon according to claim 1, wherein the second spacing is at least approximately twice as great as the first spacing.

3. An optical fiber ribbon according to claim 1, wherein the second spacing is at least approximately three times greater than the first spacing.

4. An optical fiber ribbon according to claim 1, wherein the second spacing is at least approximately four times greater than the first spacing.

5. An optical fiber ribbon according to claim 1, wherein the first spacing is defined between centers of adjacent optical fibers and is approximately 250 microns, and the second spacing is defined between centers of adjacent optical fibers and is approximately 500 microns.

6. An optical fiber ribbon according to claim 1, wherein the first spacing is defined between centers of adjacent optical fibers and is approximately 250 microns, and the second spacing is defined between centers of adjacent optical fibers and is approximately 750 microns.

7. An optical fiber ribbon according to claim 1, wherein the first spacing is defined between centers of adjacent optical fibers and is approximately 250 microns, and the second spacing is defined between centers of adjacent optical fibers and is approximately 1000 microns.

8. An optical fiber ribbon according to claim 1, wherein between the first and second ends of the bonding material none of the optical fibers cross one another.

9. An optical fiber ribbon according to claim 1, wherein the first segment of the bonding material defines a first width, the second segment of the bonding material defines a second width, and the second width is greater than the first width.

10. An optical fiber ribbon according to claim 1, wherein the first and second bonding materials are contiguous.

11. An optical fiber ribbon according to claim 1, wherein:

the first bonding material comprises a solidified polymeric material that fills the interstices between the optical fibers and extends to the outside boundary of the optical fiber ribbon; and

the second bonding material comprises a tape and an adhesive backing on a side of the tape that is oriented toward the optical fibers.