Integration of surface emitting laser and photodiode for monitoring power output of surface emitting laser
First Claim
1. An integrated light emitting device and photodetecting device comprising:
- an active region including a light generation region for generating light in response to light passing therethrough, the active region having a first side and a second opposite side, the light generation region emitting light in a first direction through a first surface;
a second mirror region having a first side and a second opposite side, the second mirror region for reflecting light towards the light generation region, the second mirror region being located on the first side of the active region;
a first mirror region having a first side and a second opposite side, the first mirror region for reflecting light towards the light generation region, the first side of the first mirror region being located on the second side of the active region;
a substrate having a first side and a second opposite side, the first side of the substrate being located on the second side of the first mirror region; and
a Schottky contact for detecting light emitted in the first direction, the Schottky contact being formed on the first surface.
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Abstract
The present invention provides a structure and method for integrating a photodiode and surface emitting laser on a substrate which minimizes both process complexity and exposure of epitaxial layers. In a first embodiment, a photodiode structure is integrated with the surface emitting laser simply by adding a separate Schottky contact to the surface of the SEL. In a second embodiment, a photodiode structure is integrated with the surface emitting laser by positioning a current isolation region between the photodiode and the SEL. The current isolation region should extend into a first mirror region but not into the light generation region of the active region so that the light generation region of the SEL is optically coupled to the light absorption region of the photodiode.
63 Citations
18 Claims
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1. An integrated light emitting device and photodetecting device comprising:
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an active region including a light generation region for generating light in response to light passing therethrough, the active region having a first side and a second opposite side, the light generation region emitting light in a first direction through a first surface; a second mirror region having a first side and a second opposite side, the second mirror region for reflecting light towards the light generation region, the second mirror region being located on the first side of the active region; a first mirror region having a first side and a second opposite side, the first mirror region for reflecting light towards the light generation region, the first side of the first mirror region being located on the second side of the active region; a substrate having a first side and a second opposite side, the first side of the substrate being located on the second side of the first mirror region; and a Schottky contact for detecting light emitted in the first direction, the Schottky contact being formed on the first surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of forming an integrated light emitting device and photodetecting device comprising the steps of:
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forming a first mirror region on a substrate having a first side and a second opposite side, the first mirror region having a first and second opposite side, the first mirror region for reflecting light towards a light generation region, wherein the second side of the first mirror region is located on the first side of the substrate; forming an active region including the light generation region for generating light in response to light passing therethrough, the light generation region for emitting light in a first direction through a first surface, the active region having a first side and a second opposite side, wherein the second side of the active region is located on the first side of the first mirror region; forming a second mirror region, having a first side and a second opposite side, the second mirror region for reflecting light towards the light generation region, the first side of the second mirror region being located on the first side of the active region; and forming a Schottky contact on the first surface. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification