Light emitting element array and optical transmission device

Patent metadata

Field	Value
Publication number	US-10177532-B2
Application number	US-201715783009-A
Country	US
Kind code	B2
Filing date	Oct 13, 2017
Priority date	Nov 16, 2016
Publication date	Jan 8, 2019
Grant date	Jan 8, 2019

Abstract

A light emitting element array includes plural light emitting elements connected in parallel to each other by a wiring connected to a terminal configured to supply a current. The number of light emitting elements which have the shortest path length among path lengths on the wiring from the terminal to the respective light emitting elements along a path of the current is one.

First claim

What is claimed is:

1. A light emitting element array comprising:
a plurality of light emitting elements connected electrically in parallel to each other by a wiring connected to a terminal configured to supply a current,
wherein a number of the light emitting elements which have a shortest path length among path lengths on the wiring from the terminal to the plurality of respective light emitting elements along a path of the current is one.

2. The light emitting element array according to claim 1 , wherein
the number of the plurality of light emitting elements is three, and
the number of the light emitting elements having the shortest path length is one.

3. The light emitting element array according to claim 1 , wherein
the number of the plurality of light emitting elements is four, and
the number of the light emitting elements having the shortest path length is one.

4. The light emitting element array according to claim 1 , wherein all of the plurality of light emitting elements have different path lengths on the wiring from the terminal to the plurality of respective light emitting elements along the path of the current.

5. The light emitting element array according to claim 2 , wherein all of the plurality of light emitting elements have different path lengths on the wiring from the terminal to the plurality of respective light emitting elements along the path of the current.

6. The light emitting element array according to claim 3 , wherein all of the plurality of light emitting elements have different path lengths on the wiring from the terminal to the plurality of respective light emitting elements along the path of the current.

7. An optical transmission device comprising:
the light emitting element array according to claim 1 ,
wherein the light emitting element array is disposed such that light emitted from the light emitting element array enters an optical transmission path configured to transmit light.

8. The optical transmission device according to claim 7 , wherein the optical transmission path is a multi-mode fiber having a core diameter of about 100 μm or less.

9. The light emitting element array according to claim 1 , wherein the light emitting elements, the wiring, and the terminal are formed on a common semiconductor substrate.

10. The light emitting element array according to claim 9 , wherein the terminal is an electrode pad formed on the semiconductor substrate.

11. The light emitting element array according to claim 1 , wherein the wiring is formed around each of the light emitting elements such that the wiring encompasses the light emitting elements.

12. The light emitting element array according to claim 1 , wherein an area of the plurality of light emitting elements excluding an emission aperture is covered with the wiring.

13. The light emitting element array according to claim 2 , wherein each of the light emitting elements is positioned at a vertex of a triangle.

14. The light emitting element array according to claim 3 , wherein each of the light emitting elements is positioned at a vertex of a quadrangle.

15. An optical transmission device comprising:
the light emitting element array according to claim 1 , and
an optical transmission path configured to transmit light,
wherein the plurality of light emitting elements are disposed such that light emitted from the plurality of light emitting elements enter a single core of the optical transmission path.

16. The optical transmission device according to claim 15 ,
wherein the optical transmission path is an optical fiber, and
wherein a distance between the light emitting elements is less than a core diameter of the optical fiber.

17. A light emitting element array comprising:
a plurality of light emitting elements connected electrically in parallel to each other by a wiring connected to a terminal configured to supply a current,
wherein a number of the light emitting elements which have a shortest path length among path lengths on the wiring from the terminal to the plurality of respective light emitting elements along a path of the current is one,
wherein the light emitting element array further comprises:
a regulation area that is formed between light emitting elements included in the plurality of light emitting elements and that is configured to regulate the path of the current flowing to the light emitting elements,
wherein the number of light emitting elements which are closest to the terminal on the path of the current regulated by the regulation area is one.

18. A light emitting element array comprising:
a plurality of light emitting elements connected electrically in parallel to each other by a wiring connected to a terminal configured to supply a current,
wherein a number of the light emitting elements which have a shortest path length among path lengths on the wiring from the terminal to the plurality of respective light emitting elements along a path of the current is one, and
wherein
a light emitting element, of the plurality of light emitting elements, having a shorter path length on the wiring from the terminal thereto along the path of the current has a smaller current confinement diameter than a light emitting element, of the plurality of light emitting elements, having a longer path length on the wiring from the terminal thereto along the path of the current has.

Assignees

• Fuji Xerox Co Ltd

Inventors

• Hayakawa Junichiro
• Murakami Akemi
• Nakayama Hideo
• Otsuka Tsutomu

Classifications

• H01S5/04256

  characterised by the configuration · CPC title

• H01S2301/176

  Specific passivation layers on surfaces other than the emission facet · CPC title

• H01S5/34313

  with a well layer having only As as V-compound, e.g. AlGaAs, InGaAs · CPC title

• H01S5/0282

  Passivation layers or treatments · CPC title

• H01S5/18394

  Apertures, e.g. defined by the shape of the upper electrode · CPC title