H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 10/00 (2006.01)
Patent
CA 2064423
- 13- DIFFERENTIAL FREE SPACE OPTICAL SIGNAL TRANSMISSION Abstract Alignment problems are mitigated in connection with optical signal transmission and similar multiple path-supporting transmission media by the use of differential optical transmission. When the source signals are electronic, a complementary signal is developed electronically, and the signal and its complement are each applied to a light emitting device. The light of each of the light emitting devices is collimated with a lens and transmitted to a receiving lens. The two receiving lenses focus their respective collimated input onto photodetectors which convert the light to electronic signals, and the electronic signals of the two photodetectors are applied to a differential amplifier. The two lenses that transmit the signal and its complement for a transmitting pair, and the two lenses that receive the signal and its complement form a receiving pair. To utilize the advantages of this invention, the transmitting pair and the receiving pair need to be aligned with respect to each other so that each of the photodetectors receives approximately the same proportion of the transmitted optical signal of the two light emitting devices, respectively.
American Telephone And Telegraph Company
Huang Alan
Kirby Eades Gale Baker
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