GB1200897A - Information transmission system - Google Patents
Information transmission systemInfo
- Publication number
- GB1200897A GB1200897A GB1446567A GB1446567A GB1200897A GB 1200897 A GB1200897 A GB 1200897A GB 1446567 A GB1446567 A GB 1446567A GB 1446567 A GB1446567 A GB 1446567A GB 1200897 A GB1200897 A GB 1200897A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pulse
- polarization
- beams
- light
- polarizer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/532—Polarisation modulation
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
Abstract
1,200,897. Optical information transmitting system. ENGLISH ELECTRIC CO. March 28, 1968 [March 30, 1967], No.14465/67. Heading G1A. [Also in Division H4] The receiver for a system in which information is conveyed by the angle of polarisation of light in a beam, for example from a laser 15 comprised at least one polarizer 1 for polarising light received from the transmitter at 45 degrees to its mean plane of polarization, and a photo-detector fed by the beam which has passed through the polarizer. Light from a source 15 which need not be in the visible spectrum is polarized by a Nicol prism 17 and modulated with coded information by a Kerr cell 18. The received beam is split into two slightly divergent beams by a Wollaston prism 25 to produce polarization at right angles in the respective beams and at 45 degrees to the polarization of the unmodulated beam. The beams are separately detected, and the resulting signals are applied to a differential amplifier. The coding device may produce pulse-code, pulse-position, pulse-frequency or pulse-width modulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1446567A GB1200897A (en) | 1967-03-30 | 1967-03-30 | Information transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1446567A GB1200897A (en) | 1967-03-30 | 1967-03-30 | Information transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1200897A true GB1200897A (en) | 1970-08-05 |
Family
ID=10041682
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1446567A Expired GB1200897A (en) | 1967-03-30 | 1967-03-30 | Information transmission system |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1200897A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0138584A2 (en) * | 1983-10-20 | 1985-04-24 | Seiko Instruments Inc. | Self referring type of optical communication system |
-
1967
- 1967-03-30 GB GB1446567A patent/GB1200897A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0138584A2 (en) * | 1983-10-20 | 1985-04-24 | Seiko Instruments Inc. | Self referring type of optical communication system |
| EP0138584A3 (en) * | 1983-10-20 | 1988-03-16 | Seiko Instruments Inc. | Self referring type of optical communication system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| CSNS | Application of which complete specification have been accepted and published, but patent is not sealed |