GB1493709A - Method for transmitting two-dimensional information and apparatus for effecting same - Google Patents
Method for transmitting two-dimensional information and apparatus for effecting sameInfo
- Publication number
- GB1493709A GB1493709A GB790375A GB790375A GB1493709A GB 1493709 A GB1493709 A GB 1493709A GB 790375 A GB790375 A GB 790375A GB 790375 A GB790375 A GB 790375A GB 1493709 A GB1493709 A GB 1493709A
- Authority
- GB
- United Kingdom
- Prior art keywords
- unit
- light guide
- information
- modulator
- optical
- 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
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/22—Adaptations for optical transmission
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- Multimedia (AREA)
- Holo Graphy (AREA)
Abstract
1493709 Optical signal transmission R F AVRAMENKO V I NIKOLAEVA and L A ORLOV 25 Feb 1975 7903/75 Heading G2J A method of transmitting 2-D information at optical frequencies (e.g. for Video-telephone or 3-D T.V. networks) comprises transmitting in succession, through an optical communication line, a 2-D information signal formed by 2-D spatial modulation of a coherent light flux and a 2-D optical reference signal displaced by a time interval that does not exceed the time instability interval of the communication line and, at the output of the communication line, combining the information and reference signals so that the identical distortions due to the communication line are compensated. In the arrangement of Fig. 1, light from a laser 2 is pulsed by switching means 6 which may be a Kerr cell or an electro-optic modulator based on the Pockels effect. The pulses are then spatially separated at 7 by an electro-optic crystal deflector or ultrasonically into the information signal path 9, 10 and the reference signal path 8. Light in the information signal path passes through an information modulator 9 (which may be a device for the transillumination of slides or film; an electro-optical modulator matrix; an ultrasonic modulator or an eidophore modulator) and a unit 10 for optimum matching to the line 4. Light in the reference path passes through a unit 8 similar to unit 10. Pulses from units 8, 10 are applied to a spatial matching unit 11 (e.g. a mirror system) from which they travel to an input unit 12 which is controlled, in common with units, 6, 7 and 8 by synchrosignals from generator 38. The pulses travel successively along the line 4 which may be free space; a guide containing lenses or mirrors or a multi-mode light guide having polished internal walls (see below) to an output unit 13 also controlled by a synchrosignal generator 39. The pulses are discriminated in time by switch 14 and applied to the processing unit 15, Fig. 2. The processing unit 15 comprises a separation unit 16 which separates the information from the reference signals, one of which, depending on their sequence, is fed to a delay unit 17 before both are applied to the input of a spatial matching unit 18 where an interference pattern i.e. a hologram is formed which is recorded at 20 after amplification at 19. The hologram recorded at 20 is illuminated by source 22, under the control of synchrosignals from generator 39, and the hologram reconstruction is recorded by still or cine camera 21. The multi-mode light guide, Fig. 6, may be of square, circular or triangular cross-section and has polished internal faces. To eliminate reflections at angles in excess of the pre-selected beam divergence angle, the internal surface has evenly spaced black portions 45 whose cross-sectional dimensions are no less than those of the light guide and whose length equals the diameter of the guide divided by the sine of the beam divergence angle. The input 12 and output 13 units are deflectable semi-reflectors operated by selectors 46. Plates 48, 49 are installed in the light guide having pseudo-random phase transmission (48) or reflection (49) coefficients to reduce the effect of irregularities in the light guide. The light guide may be constructed as sealed pipe lengths each filled with an inert gas (e.g. argon).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB790375A GB1493709A (en) | 1975-02-25 | 1975-02-25 | Method for transmitting two-dimensional information and apparatus for effecting same |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB790375A GB1493709A (en) | 1975-02-25 | 1975-02-25 | Method for transmitting two-dimensional information and apparatus for effecting same |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1493709A true GB1493709A (en) | 1977-11-30 |
Family
ID=9842017
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB790375A Expired GB1493709A (en) | 1975-02-25 | 1975-02-25 | Method for transmitting two-dimensional information and apparatus for effecting same |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1493709A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6078954A (en) * | 1998-05-26 | 2000-06-20 | Williams Communications, Inc. | Server directed multicast communication method and system |
US6182084B1 (en) | 1998-05-26 | 2001-01-30 | Williams Communications, Inc. | Method and apparatus of data comparison for statistical information content creation |
RU2733805C2 (en) * | 2015-12-31 | 2020-10-07 | Виасат, Инк. | Broadband satellite communication system in which optical feeder communication lines are used |
-
1975
- 1975-02-25 GB GB790375A patent/GB1493709A/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6078954A (en) * | 1998-05-26 | 2000-06-20 | Williams Communications, Inc. | Server directed multicast communication method and system |
US6182084B1 (en) | 1998-05-26 | 2001-01-30 | Williams Communications, Inc. | Method and apparatus of data comparison for statistical information content creation |
RU2733805C2 (en) * | 2015-12-31 | 2020-10-07 | Виасат, Инк. | Broadband satellite communication system in which optical feeder communication lines are used |
US11005562B2 (en) | 2015-12-31 | 2021-05-11 | Viasat, Inc. | Broadband satellite communication system using optical feeder links |
US11641236B2 (en) | 2015-12-31 | 2023-05-02 | Viasat, Inc. | Broadband satellite communication system using optical feeder links |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |