US3752992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical communication system
Assignee: United States Department of the Navy
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Filing: 1969-05-28
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Granted: 1973-08-14
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Expires: 1989-05-28
Abstract
Abstract An optical communication system including a device for splitting the output beam from a laser into two quadrature polarized beams, phase modulators for modulating at least one of the two beams, and a combiner for thereafter aligning the two means in a noninterfering manner for transmission along a single path. The system further includes a receiver for receiving and separating the two transmitted beams, a rotator for axially re-aligning the polarized beams, and a combiner for combining the two beams in an interfering manner thereby causing amplitude modulation of the combined beam. The signal information is then removed from the amplitude modulated beam by a detector and fed to any suitable readout device.
Inventors
- 👤 F Fluhr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:26
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/11; H04B10/112; H04B10/1121; H04J; H04J14/00; H04J14/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
117 words
An optical transmission system comprising: a source of laser energy; splitting means coupled to said source of laser energy for splitting the laser light into two laser beams; polarization rotor means coupled to said splitting means for rotating one of said beams in quadrature relationship with the other; a first phase modulating means coupled to the polarization rotor means for modulating one of said beams with a reference signal; a second phase modulating means coupled to said polarization rotor means for modulating the other beam with a modulating signal containing information; combining means coupled to both of said modulating means for aligning and propagating said two beams in superposition with each other while retaining their quadrature relationship.
Claim 2
Dependent Claim
117 words
An optical transmission system comprising: a source of laser energy; splitting means coupled to said source of laser energy for splitting the laser light into two laser beams; polarization rotor means coupled to said splitting means for rotating one of said beams in quadrature relationship with the other; a first phase modulating means coupled to the polarization rotor means for modulating one of said beams with a reference signal; a second phase modulating means coupled to said polarization rotor means for modulating the other beam with a modulating signal containing information; combining means coupled to both of said modulating means for aligning and propagating said two beams in superposition with each other while retaining their quadrature relationship.
Claim 3
Dependent Claim
205 words
An optical communication system comprising: transmitter means including, a source of laser energy; splitting means coupled to said source of laser energy for splitting the laser light into two laser beams; polarization rotor means coupled to said splitting means for rotating one of said beams in quadrature relationship with the other; a first phase modulating means coupled to the polarization rotor means for modulating one of said beams with a reference signal; a second phase modulating means coupled to said polarization rotor means for modulating the other beam with a modulating signal containing information; a first combining means coupled to both of said modulating means for aligning and propagating said two beams in superposition with each other while retaining their quadrature relationship; receiving means including, separator means for separating said two superposed laser beams into two separate received beams while maintaining the quadrature relationship; rotating means coupled to said separator means for rotating one of said received beams into parallel relationship with the other; a second combining means coupled to said rotating means for combining said two received beams into one composite beam while maintaining their parallel oriented relationship; detecting means coupled to said second combining means for extracting the information from said composite beam.
Claim 4
Dependent Claim
205 words
An optical communication system comprising: transmitter means including, a source of laser energy; splitting means coupled to said source of laser energy for splitting the laser light into two laser beams; polarization rotor means coupled to said splitting means for rotating one of said beams in quadrature relationship with the other; a first phase modulating means coupled to the polarization rotor means for modulating one of said beams with a reference signal; a second phase modulating means coupled to said polarization rotor means for modulating the other beam with a modulating signal containing information; a first combining means coupled to both of said modulating means for aligning and propagating said two beams in superposition with each other while retaining their quadrature relationship; receiving means including, separator means for separating said two superposed laser beams into two separate received beams while maintaining the quadrature relationship; rotating means coupled to said separator means for rotating one of said received beams into parallel relationship with the other; a second combining means coupled to said rotating means for combining said two received beams into one composite beam while maintaining their parallel oriented relationship; detecting means coupled to said second combining means for extracting the information from said composite beam.
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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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |