Active optical limiting semiconductor device and method with active region transparent to light becoming opaque when not biased
US9051177B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 27, 2008 |
| Grant date | Jun 9, 2015 |
| Priority date | — |
| Expiry date | Sep 28, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical switching system comprising an embodiment with a high pass filter operable to eliminate a portion of frequencies present in an image and an optical device operative to receive the spectrally modified image from the high pass filter, alternatively amplify the spectrally modified image, and propagate at least those frequency components in the spectrally modified image exhibiting a frequency less than an absorption frequency of the optical switching device when the optical switching device is active. Alternatively, the optical switching system may transmit an image only when the system is active. The optical switching system may, for example, comprise superluminescent light emitting diodes which may be, for example, formed in the shape of an inverted truncated prism. For human viewing purposes, the operative transmission ranges may closely coincide with the maximum sensitivity of the photopic response of the corresponding red, blue and green cones in human eyes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.