Optical fiber mounted photonic integrated circuit device

• US 10,488,596 B2
• Filed: 08/28/2017
• Issued: 11/26/2019
• Est. Priority Date: 09/07/2016
• Status: Active Grant

• Current Assignee: Fujitsu Limited, Photonics Electronics Technology Research Association
• Original Assignee: Fujitsu Limited
• Inventors: Akiyama, Tomoyuki
• Primary Examiner(s): Wong, Tina M
• Application Number:
  US15/688,084
• Publication Number:
  US 20180067265A1
• Time in Patent Office: 820 Days
• Field of Search: None
• CPC Class Codes: G02B 2006/12061 Silicon
• CPC Class Codes: G02B 2006/12085 Integrated
• CPC Class Codes: G02B 6/12 of the integrated circuit kind electric integrated circuits H01L27/00
• CPC Class Codes: G02B 6/29317 Light guides of the optical fibre type
• CPC Class Codes: G02B 6/305 and having an integrated mode-size expanding section, e.g. tapered waveguide
• CPC Class Codes: G02B 6/3632 characterised by the cross-sectional shape of the mechanical coupling means
• CPC Class Codes: G02B 6/4228 Passive alignment, i.e. without a detection of the degree of coupling or the position of the elements G02B6/4234 takes precedence

Abstract

The invention relates to an optical fiber mounted photonic integrated circuit device, wherein the tolerance for positioning in terms of the coupling between the single mode optical fibers and the optical waveguides provided on the photonic integrated circuit device is increased. An optical waveguide core group is provided in such a manner where a plurality of optical waveguide cores having a portion that is tapered in the direction of the width within a plane are aligned parallel to each other at intervals that allow for mutual directional coupling and that are narrower than the width of the core of the single mode optical fiber, and the inclined connection end surface of the single mode optical fiber and the upper surface of an end portion of the optical waveguide cores face each other for coupling.

Claims

1. An optical fiber mounted photonic integrated circuit device, comprising:

an optical integrated circuit device configured to be provided with an optical waveguide core group where a plurality of optical waveguide cores having portions that are tapered in the direction of the width within a plane are aligned on a substrate; and

a single mode optical fiber having an inclined connection end surface inclined relative to the propagation of light configured to be optically coupled with the optical waveguide core group, wherein

the optical waveguide cores are aligned parallel to each other at intervals that can allow for mutual directional coupling and that are narrower than the width of the core of the single mode optical fiber,

the inclined connection end surface of the single mode optical fiber and the upper surface of the end portions of the optical waveguide cores face each other for coupling,

the number of optical waveguide cores in the optical waveguide core group is seven, and

the optical waveguide cores in the optical waveguide core group connect with a clad layer of the single mode optical fiber.

2. The optical fiber mounted photonic integrated circuit device according to claim 1, wherein the optical waveguide cores include one optical waveguide core at the center, relative to which the other optical waveguide cores are aligned in a line symmetric manner.

3. The optical fiber mounted photonic integrated circuit device according to claim 1 or 2, wherein the end portions of the optical waveguide cores are all in the same shape.

4. The optical fiber mounted photonic integrated circuit device according to claim 1 or 2, wherein the end portion of the optical waveguide core at the center is in a shape that is different from the shape of the end portions of the other optical waveguide cores.

5. The optical fiber mounted photonic integrated circuit device according to claim 1, wherein a plurality of optical waveguide core groups are aligned parallel to each other in the direction n which light propagates, and single mode optical fibers, of which the number corresponds to the number of optical waveguide core groups, are arranged.

6. The optical fiber mounted photonic integrated circuit device according to claim 1, wherein a plurality of optical waveguide core groups are arranged in a two-dimensional matrix, and single mode optical fibers, of which the number corresponds to the number of optical waveguide core groups, are arranged.

7. The optical fiber mounted photonic integrated circuit device according to claim 1, wherein the photonic integrated circuit device is a silicon photonic integrated circuit device, and the optical waveguide cores are made of silicon having the width of hundreds nanometers to thousands of nanometers.

8. The optical fiber mounted photonic integrated circuit device according to claim 1, wherein a transparent member, which is either liquid, semiliquid, or solid that is transparent, semitransparent, or translucent for the propagating light, is intervened between the inclined connection end surface of a single mode optical fiber and the upper surface of an optical waveguide core group.

9. The optical fiber mounted photonic integrated circuit device according to claim 1, further comprising:

ferrules for fixing the single mode optical fibers; and

positioning mechanisms for positioning the ferrules on the substrate of the photonic integrated circuit device.

10. The optical fiber mounted photonic integrated circuit device according to claim 9, wherein the ferrules have a first engaging member, and the substrate of the photonic integrated circuit device has second engaging members configured to engage with the first engaging members.

11. The optical fiber mounted photonic integrated circuit device according to claim 10, further comprising a weight applying mechanism configured to apply weight to the ferrules toward the photonic integrated circuit side.