US3845293A
Expired / Lapsed
US
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Electro-optical transmission system utilizing lasers
Assignee: Telefunken Patentverwertungs GmbH
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Filing: 1972-09-28
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Granted: 1974-10-29
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Expires: 1992-09-28
Abstract
Abstract An information transmission system utilizing laser beams with information superimposed thereon by means of pulse code modulation and which comprises a plurality of repeater stations each of which contains a receiver in the form of a photosensitive semiconductor diode which directly detects the received signal, semiconductor amplifier pulse processing devices controlled by the signal pulses decoded by the associated receiver, and a transmitter in the form of a semiconductor laser which is not externally cooled for retransmitting the processed pulses. The information transmission between the repeater stations is effected by light-wave fiber conductors.
Inventors
- 👤 M Borner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:53
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/29; H04B10/291; H04B10/293; H04B10/2933; H04B10/2935; H04B10/50; H04B10/501; H04B10/503; H04B10/516; H04B10/524
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
221 words
A laser beam transmission system for information represented in pulse code modulation comprising in combination: a laser transmitter stage means for producing a light beam which is pulse code modulated with the information to be transmitted; a light responsive receiver stage means for receiving the pulse code modulated light beam; and a signal transmission channel connecting said transmitter stage means with said receiver stage means, said transmission channel including a plurality of series connected repeater stages and a plurality of closed light signal transmission sections consisting of light-wave fiber conductors, each of said sections connecting the output of one stage with the input of the succeeding adjacent stages of said system, each of said repeater stages including a photosensitive receiver for the information bearing light emitted by the preceeding stage, said photosensitive receiver including a semiconductor avalanche photodiode connected to provide for the direct detection of the received light, a semiconductor amplifier for amplifying the electrical signals from said photodiode, a semiconductor pulseprocessing circuit means for reshaping the amplified electrical signals, and a non-externally cooled semiconductor laser means, which is responsive to the reshaped electrical signals from said pulse-processing circuit means, for producing a light beam modulated according to said reshaped electrical signals and transmitting the information to the succeeding stage of said system via one of said closed transmission sections.
Claim 2
Dependent Claim
221 words
A laser beam transmission system for information represented in pulse code modulation comprising in combination: a laser transmitter stage means for producing a light beam which is pulse code modulated with the information to be transmitted; a light responsive receiver stage means for receiving the pulse code modulated light beam; and a signal transmission channel connecting said transmitter stage means with said receiver stage means, said transmission channel including a plurality of series connected repeater stages and a plurality of closed light signal transmission sections consisting of light-wave fiber conductors, each of said sections connecting the output of one stage with the input of the succeeding adjacent stages of said system, each of said repeater stages including a photosensitive receiver for the information bearing light emitted by the preceeding stage, said photosensitive receiver including a semiconductor avalanche photodiode connected to provide for the direct detection of the received light, a semiconductor amplifier for amplifying the electrical signals from said photodiode, a semiconductor pulseprocessing circuit means for reshaping the amplified electrical signals, and a non-externally cooled semiconductor laser means, which is responsive to the reshaped electrical signals from said pulse-processing circuit means, for producing a light beam modulated according to said reshaped electrical signals and transmitting the information to the succeeding stage of said system via one of said closed transmission sections.
Claim 3
Dependent Claim
57 words
The laser beam transmission system as defined in claim 1 wherein the maximum pulse rate of the signal transmitted by said transmitter means is approximately 2 G bits per second and wherein the maximum pulse rate to which said photodiodes will respond is substantially higher than this value whereby increased amplification in said avalanche diodes is obtained.
Claim 4
Dependent Claim
82 words
A laser beam transmission system as defined in claim 1 wherein said photosensitive receiver comprises: a capacitor connected in series with said photodiode, a choke coil connected between the source of d.c. potential and the terminal of said photodiode which is connected to said capacitor, and a load resistance connected in parallel with the series connection of said photodiode and said capacitor, and, a pair of output terminals for said photosensitive receiver connected respectively to the opposite ends of said load resistance.
Claim 5
Dependent Claim
23 words
A laser beam transmission system as defined in claim 1, wherein each of said semiconductor laser means is a semiconductor injection laser diode.
Claim 6
Dependent Claim
22 words
A laser beam transmission system as defined in claim 4 wherein said semiconductor injection laser diodes are internally cooled semiconductor laser diodes.
Claim 7
Dependent Claim
33 words
A laser beam transmission system as defined in claim 1, wherein the said light-wave fiber conductors are designed in such a manner and so dimensioned that only individual light-wave modes can develop therein.
Claim 8
Dependent Claim
31 words
A laser beam transmission system as defined in claim 1, wherein the said light-wave fiber conductors are designed in such a manner that they propagate fluctuations in intensity of the light.
Claim 9
Dependent Claim
45 words
A laser beam transmission system as defined in claim 1, wherein said transmission system includes a plurality of like parallel channels; and wherein the transmission sections constituted by the plurality of light-wave fiber conductors for the respective channels are combined to form a multi-conductor cable.
Claim 10
Dependent Claim
37 words
A laser beam transmission system as defined in claim 8, wherein said cable further includes at least one electrical conductor which is connected to a power supply line for supplying the power required in a repeater stage.
Claim 11
Dependent Claim
47 words
A laser beam transmission system as defined in claim 8, wherein at least some of said transmission sections are divided into a plurality of cables at the output of one or more repeater stages, with each cable containing a portion of said plurality of light-wave fiber conductors.
Claim 12
Dependent Claim
65 words
A laser beam transmission system as defined in claim 1, wherein said transmission system includes a plurality of said transmitter stage means and of said receiver stage means; and wherein said transmission channel includes a plurality of branches, interconnected by means of said repeater stages, connecting said plurality of transmitter stage means to said plurality of receiver stage means to form a transmission network therebetween.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |