Patent US3338170A successfully refreshed from Google Patents.
US4335463A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Simultaneous integral multi-access transmission system on transmission lines by optical fibres
Assignee: Thales Avionics SAS
•
Filing: 1980-10-07
•
Granted: 1982-06-15
•
Expires: 2000-10-07
Abstract
Abstract Spectrum spread transmission system, particularly for telephone network, employing optical fibres. It comprises, for the emission part, a pseudo-random sequence generator, a multiplier, a transducer for transducing electrical signals into light and, for the reception part, a transducer transducing light into electrical signals, a pseudo-random sequence generator and a threshold detector. Synchronized emission clock and reception clock are provided.
Inventors
- 👤 Joseph Foucard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:48
CPC Classifications
H; H04; H04J; H04J14/00; H04J14/005; H04B; H04B1/00; H04B1/69; H04B10/00; H04J13/00; H04J13/0007; H04J13/0022
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
297 words
A system for transmitting information in the form of electrical signals from an emitter to a receiver by an optical fiber transmission medium, said system being characterized in that said emitter comprises: shaper means for shaping said electrical signals; code generator for generating a pseudo-random code; modulator means connected to said shaper means and said generator for deriving a product of said shaped electrical signals and said pseudo-random code so that the spectrum of the information contained in the electrical signals to be transmitted is spread over all the pass-band availabe at the emitter side of said transmission medium; a power adapter connected to receive said product from said modulator means; and transducer means connected to said power adapter for transducing output signals from said power adapter into light pulses to be introduced into optical fiber transmission medium; and said receiver comprises: transducer means receiving said light pulses from said optical fiber transmission medium for transducing said light pulses into received electrical signals; an amplifier with automatic gain control connected to said transducer means of said receiver for amplifying said received electrical signals; a synchronization acquisition passive filter connected to receive amplified signals from said amplifier; a further pseudo-random code generator connected to receive filtered signals from said passive filter; a voltage controlled oscillator connected to provide a clock signal to said further generator for controlling the latter; servo-control means connected between said amplifier and said oscillator for synchronizing said voltage controlled oscillator; a multiplier connected to said further generator and to said amplifier for deriving a further product of output signals of said further generator and said amplifier; a semi-integrator connected to receive said further product from said multiplier; and a threshold detector connected to said semi-integrator for restoring the electrical signals transmitted by the emitter.
Claim 2
Independent Claim
297 words
A system for transmitting information in the form of electrical signals from an emitter to a receiver by an optical fiber transmission medium, said system being characterized in that said emitter comprises: shaper means for shaping said electrical signals; code generator for generating a pseudo-random code; modulator means connected to said shaper means and said generator for deriving a product of said shaped electrical signals and said pseudo-random code so that the spectrum of the information contained in the electrical signals to be transmitted is spread over all the pass-band availabe at the emitter side of said transmission medium; a power adapter connected to receive said product from said modulator means; and transducer means connected to said power adapter for transducing output signals from said power adapter into light pulses to be introduced into optical fiber transmission medium; and said receiver comprises: transducer means receiving said light pulses from said optical fiber transmission medium for transducing said light pulses into received electrical signals; an amplifier with automatic gain control connected to said transducer means of said receiver for amplifying said received electrical signals; a synchronization acquisition passive filter connected to receive amplified signals from said amplifier; a further pseudo-random code generator connected to receive filtered signals from said passive filter; a voltage controlled oscillator connected to provide a clock signal to said further generator for controlling the latter; servo-control means connected between said amplifier and said oscillator for synchronizing said voltage controlled oscillator; a multiplier connected to said further generator and to said amplifier for deriving a further product of output signals of said further generator and said amplifier; a semi-integrator connected to receive said further product from said multiplier; and a threshold detector connected to said semi-integrator for restoring the electrical signals transmitted by the emitter.
References Cited (Backward Citations)
US3828185A
Cited
US4107518A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-06-14 | 1985-12-14 | 1986-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-14 | 1989-12-14 | 1990-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-14 | 1993-12-14 | 1994-06-15 | $7700.00 | Window Closed / Lapsed |