US4249264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and system for transmitting signals by fiber optics
Assignee: Thales SA
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Filing: 1977-07-11
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Granted: 1981-02-03
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Expires: 1997-07-11
Abstract
Abstract In the transmitter, a reference signal, produced by a voltage-controlled oscillator whose frequency is controlled by the battery voltage, is applied together with the signal to be transmitted to the transmission light emitting diode. In the receiver, the signal received is applied to a high-pass filter delivering the useful signal and to a low-pass filter reforming the reference signal. The same is compared with a predetermined voltage and the error signal is used for polarizing the reception diode and thereby maintaining constant the overall gain of the transmission channel. The output of the filter is also applied to a device controlling the voltage of the battery by measuring the frequency of the signal applied thereto.
Inventors
- 👤 Michel Crochet
- 👤 Georges Lecot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:43
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3084; H04; H04B; H04B10/00; H04B10/80; H04B10/806; H04B10/808
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
263 words
An analogic signal transmitting system of the kind comprising a transmitter with a light emitting diode and energized by a battery, and a receiver with a reception photodiode having two terminals, said light emitting diode and reception photodiode being connected by optical fibers, and in which the signal to be transmitted to the receiver output is applied to the transmitter input, comprising: an oscillator producing a reference signal and having its output connected to the light emitting diode, said reference signal being superimposed upon the signal to be transmitted, said oscillator being an oscillator having its frequency controlled by the battery voltage; an error detector having two inputs and an output; a reference signal reforming filter; a second filter having its input connected to the input of the reference signal reforming filter and its output connected to the receiver output; means connecting the inputs of the filters to one of the terminals of the reception photodiode; means connecting one of the error detector inputs to the reference signal reforming filter output; means connecting the second error detector input to a source of predetermined voltage; means modifying the level of the signal delivered by the reception photodiode and linked to the error detector output; and means indicating the level of the battery charge and comprising a pulse integrating discriminator having its input linked to the output of one of the filters and an indicator light associated to the output terminal of the discriminator whereby to be activated if the mean value of the output signal from the discriminator is less than a predetermined threshold.
Claim 2
Dependent Claim
263 words
An analogic signal transmitting system of the kind comprising a transmitter with a light emitting diode and energized by a battery, and a receiver with a reception photodiode having two terminals, said light emitting diode and reception photodiode being connected by optical fibers, and in which the signal to be transmitted to the receiver output is applied to the transmitter input, comprising: an oscillator producing a reference signal and having its output connected to the light emitting diode, said reference signal being superimposed upon the signal to be transmitted, said oscillator being an oscillator having its frequency controlled by the battery voltage; an error detector having two inputs and an output; a reference signal reforming filter; a second filter having its input connected to the input of the reference signal reforming filter and its output connected to the receiver output; means connecting the inputs of the filters to one of the terminals of the reception photodiode; means connecting one of the error detector inputs to the reference signal reforming filter output; means connecting the second error detector input to a source of predetermined voltage; means modifying the level of the signal delivered by the reception photodiode and linked to the error detector output; and means indicating the level of the battery charge and comprising a pulse integrating discriminator having its input linked to the output of one of the filters and an indicator light associated to the output terminal of the discriminator whereby to be activated if the mean value of the output signal from the discriminator is less than a predetermined threshold.
Claim 3
Dependent Claim
260 words
An analogic signal transmitting system of the kind comprising a transmitter with a light emitting diode and energized by a battery, and a receiver with a reception photodiode having two terminals, said light emitting diode and reception photodiode being connected by optical fibers, and in which the signal to be transmitted to the receiver output is applied to the transmitter input, comprising: an oscillator producing a reference signal and having its output connected to the light emitting diode, said reference signal being superimposed upon the signal to be transmitted, said oscillator being an oscillator having its frequency controlled by the battery voltage; an error detector having two inputs and an output; a reference signal reforming low-pass filter; a high-pass filter having its input connected to the input of the low-pass filter and its output connected to the receiver output; means connecting the inputs of the filters to one of the terminals of the reception photodiode; means connecting one of the error detector inputs to the low-pass filter output; means connecting the second error detector input to a source of predetermined voltage; means modifying the level of the signal delivered by the reception photodiode and linked to the error detector output; and means indicating the level of the battery charge and comprising a pulse integrating discriminator having its input linked to the output of one of the filters and an indicator light associated to the output terminal of the discriminator whereby to be activated if the mean value of the output signal from the discriminator is less than a predetermined threshold.
Claim 4
Dependent Claim
260 words
An analogic signal transmitting system of the kind comprising a transmitter with a light emitting diode and energized by a battery, and a receiver with a reception photodiode having two terminals, said light emitting diode and reception photodiode being connected by optical fibers, and in which the signal to be transmitted to the receiver output is applied to the transmitter input, comprising: an oscillator producing a reference signal and having its output connected to the light emitting diode, said reference signal being superimposed upon the signal to be transmitted, said oscillator being an oscillator having its frequency controlled by the battery voltage; an error detector having two inputs and an output; a reference signal reforming low-pass filter; a high-pass filter having its input connected to the input of the low-pass filter and its output connected to the receiver output; means connecting the inputs of the filters to one of the terminals of the reception photodiode; means connecting one of the error detector inputs to the low-pass filter output; means connecting the second error detector input to a source of predetermined voltage; means modifying the level of the signal delivered by the reception photodiode and linked to the error detector output; and means indicating the level of the battery charge and comprising a pulse integrating discriminator having its input linked to the output of one of the filters and an indicator light associated to the output terminal of the discriminator whereby to be activated if the mean value of the output signal from the discriminator is less than a predetermined threshold.
Claim 5
Dependent Claim
250 words
An analogic signal transmitting system in which a signal applied to the input of a transmitter is transmitted to the output of a receiver, comprising a transmitter including a light emitting diode, a battery energizing said light emitting diode, an oscillator producing a reference signal and having its frequency controlled by the voltage of said battery with the output of said oscillator connected to said light emitting diode, said reference signal being superimposed upon the signal to be transmitted; a receiver including a reception diode having two terminals; optical fibers connecting said light emitting dioide and said reception diode; said receiver further including an error detector having two inputs and an output, a reference signal reforming filter having an output connected to one of said inputs of said error detector, a source of predetermined voltage connected to the other of said inputs of said error detector, a second filter having an input connected to an input of said reference signal reforming filter and an output connected to an output of said receiver, said filters having their inputs connected to one of said terminals of said reception diode, means modifying the level of the signal delivered by said reception diode connected to said output of said error detector and a said terminal of reception diode, a pulse integrating discriminator having an input connected to an output of one of said filters, and means indicating the threshold level of an output signal from said discriminator connected to an output of said discriminator.
Claim 6
Dependent Claim
250 words
An analogic signal transmitting system in which a signal applied to the input of a transmitter is transmitted to the output of a receiver, comprising a transmitter including a light emitting diode, a battery energizing said light emitting diode, an oscillator producing a reference signal and having its frequency controlled by the voltage of said battery with the output of said oscillator connected to said light emitting diode, said reference signal being superimposed upon the signal to be transmitted; a receiver including a reception diode having two terminals; optical fibers connecting said light emitting dioide and said reception diode; said receiver further including an error detector having two inputs and an output, a reference signal reforming filter having an output connected to one of said inputs of said error detector, a source of predetermined voltage connected to the other of said inputs of said error detector, a second filter having an input connected to an input of said reference signal reforming filter and an output connected to an output of said receiver, said filters having their inputs connected to one of said terminals of said reception diode, means modifying the level of the signal delivered by said reception diode connected to said output of said error detector and a said terminal of reception diode, a pulse integrating discriminator having an input connected to an output of one of said filters, and means indicating the threshold level of an output signal from said discriminator connected to an output of said discriminator.
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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) | 1984-02-03 | 1984-08-04 | 1985-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-03 | 1988-08-04 | 1989-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-03 | 1992-08-04 | 1993-02-03 | $7700.00 | Window Closed / Lapsed |