Orientation variation measurement system, satellite, and orientation variation measurement method
US-2016341547-A1 · Nov 24, 2016 · US
Multiple-input method and apparatus of free-space optical communication
US9048950B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9048950-B2 |
| Application number | US-91550610-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 29, 2010 |
| Priority date | Jul 7, 2010 |
| Publication date | Jun 2, 2015 |
| Grant date | Jun 2, 2015 |
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Abstract
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An approach is provided that uses diversity to compensate fading of free-space optical (FSO) signals propagating through an environment characterized by atmospheric scintillation. One embodiment involves collecting at least one FSO beam, demultiplexing the beam by wavelength into at least two sub-beams, detecting each sub-beam to produce an electrical output therefrom, and recovering a signal using complementary information from at least two of the electrical outputs. Another embodiment involves collecting the FSO beam onto an array of spatially separated sub-apertures, detecting the light entering each sub-aperture to produce an electrical output therefrom, and recovering a signal using complementary information from at least two of the electrical outputs. This second embodiment enables both electronic adaptive processing to coherently integrate across the sub-apertures and in the case of multiple transmit apertures a free space optical Multiple Input Multiple Output (MIMO) system.
First claim
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What is claimed is: 1. A method, comprising: collecting at least one free space optical beam; directing the beam to a fiber bundle; demultiplexing the beam by wavelength into two or more sub-beams; outputting the two or more sub-beams separated at least by the coherence bandwidth, the two or more sub-beams being associated with complementary information; detecting the two or more sub-beams to produce electrical outputs corresponding to each of the two or more sub-beams and…
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- H04B10/1121Primary
Electricity · mapped topic
Electricity · mapped topic
- H04B10/11Primary
Electricity · mapped topic
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- What does patent US9048950B2 cover?
- An approach is provided that uses diversity to compensate fading of free-space optical (FSO) signals propagating through an environment characterized by atmospheric scintillation. One embodiment involves collecting at least one FSO beam, demultiplexing the beam by wavelength into at least two sub-beams, detecting each sub-beam to produce an electrical output therefrom, and recovering a signal u…
- Who is the assignee on this patent?
- Chen Young-Kai, Kaneda Noriaki, Pidwerbetsky Alex, and 1 more
- What technology area does this patent fall under?
- Primary CPC classification H04B10/1121. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jun 02 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).