US4187404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone set for optical fibers lines
Assignee: Thales SA
•
Filing: 1978-07-20
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Granted: 1980-02-05
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Expires: 1998-07-20
Abstract
Abstract A telephone set for optical fibers lines having a coupler for directing a first part of the light received from the input optical fiber on a photo-cell and a second part of this light on a microphone modulating this second part without electrical intermediate apparatus, the photo-cell feed alternately a bell or a receiver, and the light modulated by the microphone is directed via a dialling system on the output optical fiber.
Inventors
- 👤 Pierre Deman
- 👤 Luigi d'Auria
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:57
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/25; H04M; H04M1/00; H04M1/003
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
81 words
A telephone set for receiving from an input optical fiber an input optical signal and for emitting on an output optical fiber an output optical signal comprising: a two-channel coupler for dividing said input optical signal into first and a second parts; a photovoltaic cell for converting said first part in an electrical signal; a receiver actuated by said electrical signal; a microphone diaphragm for receiving and directly modulating with acoustic waves said second part and delivering said output optical signal.
Claim 2
Dependent Claim
81 words
A telephone set for receiving from an input optical fiber an input optical signal and for emitting on an output optical fiber an output optical signal comprising: a two-channel coupler for dividing said input optical signal into first and a second parts; a photovoltaic cell for converting said first part in an electrical signal; a receiver actuated by said electrical signal; a microphone diaphragm for receiving and directly modulating with acoustic waves said second part and delivering said output optical signal.
Claim 3
Dependent Claim
80 words
A telephone set according to claim 1, further comprising a bell system actuated by said electrical signal said bell system including a capacitor coupled to said electrical signal for storing charges from said electrical system, a trigger circuit coupled to said capacitor for periodically discharging said capacitor to develop a bell-ring signal, and a bell coupled to said bell ring signal, said telephone set further including first switch for alternatively connecting said receiver and said bell to said photo-electric cell.
Claim 4
Dependent Claim
29 words
A telephone set according to claim 2 further including a rotary shutter for periodically interrupting the emission of said output optical signal; each interruption corresponding to a dialling pulse.
Claim 5
Dependent Claim
94 words
A telephone set according to claim 2 wherein said output optical signal is emitted onto a plurality of output optical fibers and siad telephone set further includes a keyboard having a plurality of channels for simultaneously receiving from said microphone and propagating said second part of the input optical signal, a plurality of keys for closing said channels, and means for coupling said plurality of channels to said plurality of output optical fibers; each of said keys closing simultaneously at least two channels for determining a combination of closed channels related to said key.
Claim 6
Dependent Claim
56 words
A telephone set according to claim 2 further comprising means for partially interrupting the emission of said output optical signal when said bell is connected to said photo-electric cell; the level of said emission being reduced to a value allowing to monitor the continuity of said input and output optical fiber without demodulating said second part.
Claim 7
Dependent Claim
17 words
A telephone set according to claim 2 further comprising a wide-band output terminal connected to said photo-cell.
Claim 8
Dependent Claim
32 words
A telephone set according to claim 2 further comprising photo-emitting means for delivering onto said output optical fiber an additional optical signal and a wide-band input terminal connected to said photo-emitting means.
References Cited (Backward Citations)
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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) | 1983-02-04 | 1983-08-06 | 1984-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-04 | 1987-08-06 | 1988-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-04 | 1991-08-06 | 1992-02-05 | $7700.00 | Window Closed / Lapsed |