Optical transmission module and the production method of the same

• US 20030152119A1
• Filed: 08/16/2002
• Published: 08/14/2003
• Est. Priority Date: 02/12/2002
• Status: Active Grant

• Current Assignee: Oclaro Japan, Inc. (Oclaro (North America), Inc.)
• Original Assignee: Opnext Japan, Inc. (Oclaro (Canada), Inc.)
• Inventors: Oozeki, Yoshio, Tsuchida, Seiichi, Kawamoto, Kazumi
• Granted Patent: US 6,864,511 B2
• Time in Patent Office: Days
• US Class Current: 372/36
• CPC Class Codes: H01S 5/02251 using optical fibres
• CPC Class Codes: H01S 5/02326 Arrangements for relative positioning of laser diodes and optical components, e.g. grooves in the mount to fix optical fibres or lenses
• CPC Class Codes: H01S 5/0237 by soldering
• CPC Class Codes: H01S 5/04256 characterised by the configuration

Abstract

An optical transmission module with an optical device mounted in a substrate provided with an optical waveguide is provided wherein respective metallic electrodes in pair are symmetrically disposed in each side of an optical device divided by a centerline parallel to an optical axis such that those electrodes have an error of 60 μm or less and said metallic electrodes are soldered to a metallic electrode as disposed on a substrate, which electrode has a size enough to cover those electrodes as disposed in the optical device.

Claims

1. An optical transmission module comprising:

an optical device provided with an active layer to emanate light and a plurality of electrodes, said electrodes symmetrically disposed through a centerline passing through a center of gravity of said optical device and running parallel to an optical axis of said active layer; and

a substrate provided with one electrode to be soldered to said plurality of electrodes,

wherein said plurality of electrodes are disposed in said optical device such that a difference between shortest distances from said center of gravity of said respective electrodes symmetrically disposed through said centerline to said centerline amounts to 100 μ

m or less.

5. An optical transmission module according to claim 1 wherein said difference between said shortest distances from said center of gravity of said respective electrodes symmetrically disposed through said centerline to said centerline amounts to 60 μ

m or less.

2. An optical transmission module comprising:

an optical device provided with an active layer to emanate light and a plurality of electrodes, said electrodes symmetrically disposed through an optical axis of said active layer passing through a center of gravity of said optical device; and

a substrate provided with one electrode to be soldered to said plurality of electrodes,

wherein said plurality of electrodes are disposed in said optical device such that a difference between shortest distances from said center of gravity of said respective electrodes symmetrically disposed in each side of said optical device divided by said optical axis to said optical axis amounts to 100 μ

m or less.

6. An optical transmission module according to claim 2 wherein said difference between said shortest distances from said center of gravity of said respective electrodes symmetrically disposed in each side of said optical device divided by said optical axis to said optical axis amounts to 60 μ

m or less.

2-1. An optical transmission module comprising:

an optical device provided with an active layer to emanate light and a plurality of electrodes, said electrodes symmetrically disposed through a centerline passing through a center of gravity of said optical device and running parallel to an optical axis of said active layer; and

a substrate provided with one electrode to be soldered to said plurality of electrodes,

wherein said plurality of electrodes are disposed in said optical device such that said plurality of electrodes symmetrically disposed through said centerline have an error of 100 μ

m or less.

4. An optical transmission module comprising an optical device provided with an active layer to emanate light and a plurality of electrodes wherein said electrodes are symmetrically disposed through an optical axis of said active layer passing through a center of gravity of said optical device and a substrate provided with one electrode to be soldered to said plurality of electrodes wherein said plurality of electrodes symmetrically disposed through said optical axis have an error of 100 μ

m or less.

8. An optical transmission module according to claim 4 wherein said plurality of electrodes symmetrically disposed through said optical axis have an error of 60 μ

m or less.

7. An optical transmission module according to claim 3 wherein said plurality of electrodes symmetrically disposed through said centerline have an error of 60 μ

m or less.

9. An optical transmission module comprising:

an optical device provided with an active layer to emanate light and a plurality of electrodes, said electrodes symmetrically disposed through a centerline passing through a center of gravity of said optical device and running parallel to an optical axis of said active layer; and

a substrate provided with one electrode to be soldered to said plurality of electrodes,

wherein said plurality of electrodes are disposed in said optical device such that a difference between summation of shortest distances from said center of gravity of said respective electrodes as disposed in a first side of said optical device divided by said centerline to said centerline and said summation of said shortest distances from said center of gravity of said respective electrodes as disposed in a second side of said optical device divided by said centerline to said centerline amounts to 50 μ

m multiplied by the number of electrodes or less.

13. An optical transmission module according to claim 9 wherein said plurality of electrodes are disposed in said optical device such that said difference between summation of shortest distances amounts to 30 μ

m multiplied by the number of electrodes or less.

10. An optical transmission module comprising:

an optical device provided with an active layer to emanate light and a plurality of electrodes, said electrodes symmetrically disposed through an optical axis of said active layer passing through a center of gravity of said optical device; and

a substrate provided with one electrode to be soldered to said plurality of electrodes,

wherein said plurality of electrodes are disposed in said optical device such that a difference between summation of shortest distances from said center of gravity of said respective electrodes as disposed in a first side of said optical device divided by said optical axis to said optical axis and said summation of said shortest distances from said center of gravity of said respective electrodes as disposed in a second side of said optical device divided by said optical axis to said optical axis amounts to 50 μ

m multiplied by the number of electrodes or less.

14. An optical transmission module according to claim 10 wherein said plurality of electrodes are disposed in said optical device such that said difference amounts to 30 μ

m multiplied by the number of electrodes or less.

11. An optical transmission module comprising:

an optical device provided with an active layer to emanate light and a plurality of electrodes, said electrodes symmetrically disposed through a centerline passing through a center of gravity of said optical device and running parallel to an optical axis of said active layer; and

a substrate provided with one electrode to be soldered to said plurality of electrodes,

wherein said plurality of electrodes are disposed in said optical device such that a difference between summation of shortest distances from said center of gravity of said respective electrodes as disposed in a first side of said optical device divided by said centerline to said centerline and said summation of said shortest distances from said center of gravity of said respective electrodes as disposed in a second side of said optical device divided by said centerline to said centerline amounts to an error of 50 μ

m multiplied by the number of electrodes or less.

12. An optical transmission module comprising:

an optical device provided with an active layer to emanate light and a plurality of electrodes, said electrodes symmetrically disposed through an optical axis of said active layer; and

a substrate provided with one electrode to be soldered to said plurality of electrodes,

wherein said plurality of electrodes are disposed in said optical device such that a difference between summation of shortest distances from said center of gravity of said respective electrodes as disposed in a first side of said optical device divided by said optical axis to said optical axis and said summation of said shortest distances from said center of gravity of said respective electrodes as disposed in a second side of said optical device divided by said optical axis to said optical axis amounts to an error of 50 μ

m multiplied by the number of electrodes or less.

15. A method for producing an optical transmission module comprising the steps of:

coating a resist material on an optical device wafer, disposing an electrodes forming mask on said resist material, exposing, cleansing and removing said resist material as unnecessary from said wafer so as to form a metallic electrode all over said wafer;

removing said resist material as left so as to provide a plurality of electrodes; and

dividing said wafer into separate optical devices and soldering said plurality of electrodes to one electrode of a substrate,

wherein said plurality of electrodes are disposed in said optical device such that they are symmetrically disposed through a centerline passing through a center of gravity of said respective electrodes and running parallel to an optical axis of an active layer of said optical device and a difference between shortest distances from said center of gravity of said respective electrodes symmetrically disposed through said centerline to said centerline amounts to 100 μ

m or less.

17. A method for producing an optical transmission module according to claim 15 wherein said difference amounts to 60 μ

m or less.

16. A method for producing an optical transmission module comprising the steps of:

coating a resist material on an optical device wafer, disposing an electrodes forming mask on said resist material, exposing, cleansing and removing said resist material as unnecessary from said wafer so as to form a metallic electrode all over said wafer;

removing said resist material as left so as to provide a plurality of electrodes; and

dividing said wafer into separate optical devices and soldering said plurality of electrodes to one electrode of a substrate,

wherein said plurality of electrodes are disposed in said optical device such that they are symmetrically disposed through an optical axis of an active layer of said optical device and a difference between shortest distances from a center of gravity of said respective electrodes symmetrically disposed through said optical axis to said optical axis amounts to 100 μ

m or less.

18. A method for producing an optical transmission module according to claim 16 wherein said difference amounts to 60 μ

m or less.