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Light intensity subtractor, optical A-D converter, and method for subtracting light intensity
US8941519B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8941519-B2 |
| Application number | US-201113990168-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 18, 2011 |
| Priority date | Dec 1, 2010 |
| Publication date | Jan 27, 2015 |
| Grant date | Jan 27, 2015 |
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Abstract
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A light intensity subtractor according to one aspect of the present invention includes a light subtraction unit, a feedback circuit, a light input port, a first light output port, and a second light output port. The light subtraction unit receives input light through the light input port, outputs first output light to the first light output port, and outputs second output light to the second light output port. The light subtraction unit generates the first output light by reducing the light intensity of the second output light from the light intensity of the input light in accordance with a control voltage. The feedback circuit is connected to the light subtraction unit through the second light output port, and outputs the control voltage in accordance with the light intensity of the received second output light.
First claim
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The invention claimed is: 1. A light intensity subtractor comprising: a light input port where input light is input; a first light output port where first output light is output; a second light output port where second output light is output; a light subtracting unit that receives the input light through the light input port, outputs the first output light to the first light output port and outputs the second output light to the second light output port; and a feedback cir…
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- What does patent US8941519B2 cover?
- A light intensity subtractor according to one aspect of the present invention includes a light subtraction unit, a feedback circuit, a light input port, a first light output port, and a second light output port. The light subtraction unit receives input light through the light input port, outputs first output light to the first light output port, and outputs second output light to the second li…
- Who is the assignee on this patent?
- Sato Kenji, Nec Corp
- What technology area does this patent fall under?
- Primary CPC classification G02B6/262. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Jan 27 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).