Patent US4789213A successfully refreshed from Google Patents.
US4789213A
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Electro-optical modulator having a monomode light waveguide modulator
Assignee: Siemens AG
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Filing: 1987-04-20
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Granted: 1988-12-06
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Expires: 2007-04-20
Abstract
Abstract An electro-optical modulator has a monomode light waveguide modulator for which a pressure-sensitive signal generator is provided as a signal source for the purpose of modulating a light power signal supplied to the monomode light waveguide modulator over an input light waveguide, the electrical output of the signal generator being either directly or indirectly connected to an electrical input of the monomode light waveguide modulator. The arrangement serves for the transmission of signals representing pressure values, for example, acoustic pressure values, over an optical transmission system, and inasmuch as the electrical signals are generated by the pressure-sensitive signal generator, no external supply devices whatsoever are required at the modulator for the electrical energy.
Inventors
- 👤 Walter Heywang
- 👤 Peter Baues
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:35
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/03; G02F1/0327; G02F1/21; G02F1/225; H; H04; H04B; H04B10/00; H04B10/80; H04B10/806; H04B10/807
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
128 words
An electro-optical light modulator comprising: a pressure-sensitive signal generator including an output and operable in response to the application of pressure to produce an electrical signal at said output, said pressure-sensitive signal generator comprising an acousto-electrical piezo-electric transducer including a wafer of piezomaterial, a plurality of electrodes and counter-electrodes on said wafer forming a plurality of capacitors, and means connecting said capacitors in series so that the voltages derived from the individual capacitors add to provide the electrical signal; and monomode light waveguide modulator means including a light input for receiving a light signal, a light output for emitting a modulated light signal, and an electrical input connected to said output of said signal generator, and operable to modulate the light signal in response to said electrical signal.
Claim 2
Dependent Claim
128 words
An electro-optical light modulator comprising: a pressure-sensitive signal generator including an output and operable in response to the application of pressure to produce an electrical signal at said output, said pressure-sensitive signal generator comprising an acousto-electrical piezo-electric transducer including a wafer of piezomaterial, a plurality of electrodes and counter-electrodes on said wafer forming a plurality of capacitors, and means connecting said capacitors in series so that the voltages derived from the individual capacitors add to provide the electrical signal; and monomode light waveguide modulator means including a light input for receiving a light signal, a light output for emitting a modulated light signal, and an electrical input connected to said output of said signal generator, and operable to modulate the light signal in response to said electrical signal.
Claim 3
Dependent Claim
17 words
The electro-optical modulator of claim 1, wherein: said monomode light waveguide modulator means comprises a Mach-Zehnder modulator.
Claim 4
Dependent Claim
14 words
The electro-optical modulator of claim 2, wherein: said Mach-Zehnder modulator comprises a Y branching.
Claim 5
Dependent Claim
14 words
The electro-optical modulator of claim 2, wherein: said Mach-Zehnder modulator comprises 3 dB couplers.
Claim 6
Dependent Claim
18 words
The electro-optical modulator of claim 1, wherein: said monomode light waveguide modulator means comprises a directional coupler modulator.
Claim 7
Dependent Claim
23 words
The electro-optical modulator of claim 5, wherein: said directional coupler modulator has a coupling length and comprises electrodes disposed over the coupling length.
Claim 8
Dependent Claim
23 words
The electro-optical modulator of claim 5, wherein: said directional coupler modulator has a coupling length and comprises divided electrodes over the coupling length.
Claim 9
Dependent Claim
30 words
The electro-optical modulator of claim 1, and further comprising: an input monomode light waveguide coupled to said light input and an output monomode light waveguide coupled to said light output.
Claim 10
Dependent Claim
16 words
The electro-optical modulator of claim 1, wherein: said pressure-sensitive signal generator is an electrical voltage modulator.
Claim 11
Dependent Claim
17 words
The electro-optical modulator of claim 1, wherein: said pressure sensitive signal generator is an electrical current modulator.
Claim 12
Dependent Claim
15 words
The electro-optical modulator of claim 1, wherein: said pressure-sensitive signal generator is an acousto-electrical transducer.
Claim 13
Dependent Claim
12 words
The electro-optical modulator of claim 11, wherein: said transducer is a piezo-microphone.
Claim 14
Dependent Claim
14 words
The electro-optical modulator of claim 11, wherein: said acousto-electrical transducer is a magneto-electrical transducer.
Claim 15
Dependent Claim
22 words
The electro-optical modulator of claim 1, and further comprising: a transformer connected between said signal generator and said monomode light waveguide modulator.
Claim 16
Dependent Claim
26 words
The electro-optical modulator of claim 1, and in combination therewith: a thick core optical fiber coupled to said light output to achieve a low transmission loss.
Claim 17
Dependent Claim
59 words
The electro-optical modulator of claim 1, and further comprising, in combination: a telephone exchange; a pair of light waveguides coupling said light input and said light output to said telephone exchange; and a telephone instrument, including said electro-optical light modulator, said telephone instrument connected to said exchange only via light waveguides and further not connected to an electrical supply.
Claim 18
Dependent Claim
49 words
The electro-optical modulator of claim 16, wherein: said telephone instrument comprises a base unit, a hand set and a hand set cord connecting said base and said hand set; said electro-optical light modulator is mounted in said hand set; and said light waveguides extend through said hand set cord.
Claim 19
Dependent Claim
67 words
The electro-optical modulator of claim 16, wherein: said telephone instrument comprises a base unit, a hand set and a hand set cord, said monomode light waveguide modulator mounted in said base unit; said pressure-sensitive signal generator is mounted in said hand set; and said hand set cord comprises electrical conductors connecting said output of said signal generator to said electrical input of said monomode light waveguide modulator.
Claim 20
Dependent Claim
54 words
The electro-optical modulator of claim 16, wherein: said telephone exchange comprises an electro-optical transducer coupled to that light waveguide which is coupled to said light input of said monomode light waveguide modulator, and an opto-electrical transducer coupled to that light waveguide which is coupled to said light output of said monomode light waveguide modulator.
Claim 21
Dependent Claim
81 words
An electro-optical light modulator comprising: a pressure-sensitive signal generator including an output and operable in response to the application of pressure to produce an electrical signal at said output, said pressure-sensitive signal generator further including an acousto-electrical elektret microphone comprising a wafer of piezo material, a plurality of electrodes and counterelectrodes on said wafer forming a plurality of capacitors, and means connecting said capacitors in series so that the voltages derived from the individual capacitors add to provide the electrical signal.
Claim 22
Dependent Claim
81 words
An electro-optical light modulator comprising: a pressure-sensitive signal generator including an output and operable in response to the application of pressure to produce an electrical signal at said output, said pressure-sensitive signal generator further including an acousto-electrical elektret microphone comprising a wafer of piezo material, a plurality of electrodes and counterelectrodes on said wafer forming a plurality of capacitors, and means connecting said capacitors in series so that the voltages derived from the individual capacitors add to provide the electrical signal.
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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) | 1991-12-06 | 1992-06-06 | 1992-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-06 | 1996-06-06 | 1996-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-06 | 2000-06-06 | 2000-12-06 | $7700.00 | Window Closed / Lapsed |