US4912533A
Expired / Lapsed
US
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End face light emitting element
Assignee: Mitsubishi Electric Corp
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Filing: 1987-10-09
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Granted: 1990-03-27
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Expires: 2007-10-09
Abstract
Abstract An end face light emitting element having a light emitting region on a semiconductor substrate to emit light from the end face thereof has a light waveguide layer between the light emitting region and the substrate with the light emitting region deformed like a staircase having at least two steps.
Inventors
- 👤 Shogo Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:15
CPC Classifications
H; H10; H10H; H10H20/00; H10H20/80; H10H20/81; H10H20/819; H01; H01S; H01S5/00; H01S5/10; H10H20/811; H10H20/822; H10H20/824; H10H29/00; H10H29/10; H10H29/14; H01S5/1021; H01S5/20; H01S5/2054; H01S5/2059; H01S5/2068
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
115 words
An end face light emitting element, comprising: a semiconductor substrate, the major surface of said substrate having a first portion and a second portion which is different from the first portion; a light waveguide layer only formed on the first portion of the major surface of said semiconductor substrate; and a light emitting region formed on the second portion of the major surface of said semiconductor substrate and formed on said light waveguide layer so that said light emitting region forms a staircase configuration having at least two steps and so that said light waveguide layer and said light emitting region are light emitting at an end face of the end face light emitting element.
Claim 2
Dependent Claim
115 words
An end face light emitting element, comprising: a semiconductor substrate, the major surface of said substrate having a first portion and a second portion which is different from the first portion; a light waveguide layer only formed on the first portion of the major surface of said semiconductor substrate; and a light emitting region formed on the second portion of the major surface of said semiconductor substrate and formed on said light waveguide layer so that said light emitting region forms a staircase configuration having at least two steps and so that said light waveguide layer and said light emitting region are light emitting at an end face of the end face light emitting element.
Claim 3
Dependent Claim
40 words
The end face light emitting element according to claim 1, wherein the end face of said light emitting element is adapted to output light beams from said at least two steps, the outputted light beams being adjacent to one another.
Claim 4
Dependent Claim
34 words
The end face light emitting element according to claim 1, wherein the surface of said light waveguide layer is substantially planar, and wherein said light emitting region forms a staircase configuration having two steps.
Claim 5
Dependent Claim
69 words
The end face light emitting element according to claim 1, wherein said light emitting region comprises: a first clad layer of a first conductivity type formed on said light waveguide layer and on the second portion of said semiconductor substrate; an active layer of a second conductivity type formed on said first clad layer; and a second clad layer of the second conductivity type formed on said active layer.
Claim 6
Dependent Claim
31 words
The end face light emitting element according to claim 4, wherein said light emitting region further comprises a cap layer of the second conductivity type formed on said second clad layer.
Claim 7
Dependent Claim
41 words
The end face light emitting element according to claim 5, further including an electrode formed on the surface of said cap layer and an insulating film formed on that portion of the surface of said cap layer not including the electrode.
References Cited (Backward Citations)
US3484713A
Cited
US4365336A
Cited
US4284884A
Cited
US4488306A
Cited
US4476563A
Cited
US4438446A
Cited
US4506366A
Cited
JPS58102589A
Cited
US4464762A
Cited
US4571729A
Cited
US4602370A
Cited
JPS60182779A
Cited
US4605942A
Cited
US4730330A
Cited
US4692207A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-26 | 1993-09-25 | 1994-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-26 | 1997-09-25 | 1998-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-26 | 2001-09-25 | 2002-03-27 | $7700.00 | Window Closed / Lapsed |