Optical interconnect structure

Patent metadata

Field	Value
Publication number	US-2018106965-A1
Application number	US-201615296102-A
Country	US
Kind code	A1
Filing date	Oct 18, 2016
Priority date	Oct 18, 2016
Publication date	Apr 19, 2018
Grant date	—

Abstract

An optical interconnect structure and method are provided. The optical interconnect structure includes a plate on which a mirror is formed. The optical interconnect structure further includes a waveguide structure comprising a waveguide core and an opening. The plate is mounted on the waveguide structure such the mirror is inserted in the opening for light coupling (i) from the waveguide core and to an optical element positioned on the plate and (ii) to the waveguide core from the optical element positioned on the plate.

First claim

1 . An optical interconnect structure, comprising:
a plate on which a mirror is formed; and a waveguide structure comprising a waveguide core and an opening, wherein the plate is mounted on the waveguide structure such that the mirror is inserted in the opening for light coupling (i) from the waveguide core to an optical element positioned on a side of the plate opposite to the mirror and (ii) to the waveguide core from the optical element positioned on the side of the plate opposite to the mirror.

2 . The optical interconnect structure of claim 1 , wherein the mirror further comprises an off-axis mirror having a curved face.

3 . The optical interconnect structure of claim 1 , wherein a substantially flat horizontal portion of the plate is mounted on a top clad of the waveguide structure.

4 . The optical interconnect structure of claim 1 , wherein alignment marks matching corners of the plate are present on a top clad of the waveguide structure.

5 . The optical interconnect structure of claim 1 , wherein the optical element is flip-chip bonded on the plate above the mirror.

6 . The optical interconnect structure of claim 1 , wherein the mirror comprises a mirror array formed on the plate, the mirror array including a plurality of mirrors,
wherein the waveguide core and the opening included in the waveguide structure respectively comprise a waveguide core array and at least one opening portion, the waveguide core array including a plurality of waveguide cores, and wherein the plate is mounted on the waveguide structure such that the mirror array is inserted in the at least one opening portion for light coupling (i) from the waveguide core array to the optical element array positioned on the plate and (ii) to the waveguide core array from the optical element array positioned in the plate.

7 . The optical interconnect structure of claim 1 , wherein the mirror comprises a plurality of mirror arrays formed on the plate, each of the plurality of mirror arrays including a plurality of mirrors,
wherein the waveguide core and the opening included in the waveguide structure respectively comprise a plurality of waveguide core arrays and a plurality of opening portions, each of the plurality of waveguide core arrays including a plurality of waveguide cores, wherein the optical element positioned on the plate comprises a plurality of optical element arrays, and wherein the plate is mounted on the waveguide structure such that each of the plurality of mirror arrays is inserted in a respective one of the plurality of opening portions for light coupling, the light coupling being (i) from respective ones of the plurality of waveguide core arrays to respective ones of the plurality of optical element arrays positioned on the plate and (ii) to respective other ones of the plurality of waveguide core arrays from respective other ones of the plurality of optical element arrays positioned on the plate.

8 . The optical interconnect structure of claim 7 , further comprising a plurality of filters mounted on the plate, wherein each of the plurality of filters is deposited under a respective one of the plurality of optical element arrays and above a respective one of the plurality of mirror arrays on a receiver side of the plate, each of the plurality of filters reflecting or transmitting light selectively dependent upon a wavelength of the light.

9 . The optical interconnect structure of claim 8 , wherein the plurality of mirrors included in each of at least one of the plurality of mirror arrays on the receiver side of the plate includes pairs of mirror pieces positioned in back-to-back configurations such that (i) light outputted from a corresponding first one of the plurality of waveguide core arrays focuses onto a corresponding one of the plurality of filters and (ii) light reflected by the corresponding one of the plurality of filters re-enters a corresponding second one of the plurality of waveguide core arrays.

10 . A method for fabricating an optical interconnect structure, the method comprising:
forming a mirror on a plate; fabricating a waveguide structure including a waveguide core and an opening; mounting the plate on the waveguide structure; and inserting the mirror in the opening for light coupling (i) from the waveguide core to an optical element positioned on a side of the plate opposite to the mirror and (ii) to the waveguide core from the optical element positioned on the side of the plate opposite to the mirror.

11 . The method of claim 10 , wherein said forming step comprises forming a plurality of mirror arrays on the plate, each of the plurality of mirror arrays including a plurality of mirrors,
wherein said fabricating step comprises fabricating a plurality of waveguide core arrays and a plurality of opening portions, each of the plurality of waveguide core arrays including a plurality of waveguide cores, wherein the optical element positioned on the plate comprises a plurality of optical element arrays, and wherein said inserting step comprises inserting each of the plurality of mirror arrays in a respective one of the plurality of opening portions for light coupling, the light coupling being (i) from respective ones of the plurality of waveguide core arrays to respective ones of the plurality of optical element arrays positioned on the plate and (ii) to respective other ones of the plurality of waveguide core arrays from respective other ones of the plurality of optical element arrays positioned on the plate.

12 . The optical interconnect structure of claim 1 , wherein the optical element includes a laser chip array and a photodiode chip array; and wherein the plate includes a plurality of optical elements formed thereon, each optical element being configured to couple a different wavelength of light.

13 . The optical interconnect structure of claim 1 , wherein the plate further includes a central processing unit, a laser diode driver chip and an amplifier chip formed thereon.

Assignees

• IBM

Inventors

• Héroux Jean Benoit
• Tokunari Masao

Classifications

• G02B6/12004 Primary

  Combinations of two or more optical elements · CPC title

• G02B6/4224

  using visual alignment markings, e.g. index methods · CPC title

• G02B6/4215

  the intermediate optical elements being wavelength selective optical elements, e.g. variable wavelength optical modules or wavelength lockers (G02B6/4246 takes precedence) · CPC title

• G02B2006/12147

  Coupler · CPC title

• G02B2006/12104

  Mirror; Reflectors or the like · CPC title