Multiplex communications – Wide area network – Packet switching
Patent
1988-11-30
1989-08-22
Griffin, Robert L.
Multiplex communications
Wide area network
Packet switching
455617, 455612, 350 9614, H04B 900
Patent
active
048602795
ABSTRACT:
A coherence multiplexed optical signal transmission system in which modulation is introduced into the system by modulating the optical carrier or source signal, rather than by modulating the optical path length of an interferometer arm. The system comprises a transmitter and receiver interconnected by an optical bus. The transmitter comprises a plurality of transmitter interferometers, each transmitter interferometer including a modulated optical source. The transmitter interferometers have optical path length differences that are greater than the coherence length of the associated source, and that differ from one another by an amount greater than the source coherence length. The receiver comprises a plurality of receiver interferometers having path length differences matching those of the transmitter interferometers. Multiplexing and demultiplexing means are provided for coupling optical radiation between the bus and the interferometers. A detection system is provided that includes an output terminal associated with each receiver interferometer. For each receiver interferometer, an output signal is produced at the associated output terminal when the optical radiation coupled into the receiver interferometer includes a component that has passed through a transmitter interferometer having an output path length difference equal to the optical path length difference of the receiver interferometer, to within the coherence length of the associated source.
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Coleman Jeffrey O.
Falk R. Aaron
Griffin Robert L.
Telesz Jr. Andrew J.
The Boeing Company
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