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Optical Systems

Optical-telecommunications-system-employing-multiple-phase-compensated-optical-signals

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Optical telecommunications system employing multiple phase-compensated optical signals

Details

Inventors: Davis, Charles M.; Ward, Marvin W.; Zarobila, Clarence J.;
Assignee: Optimux Systems Corporation (Centreville, VA)
Primary Examiner: Chin; Wellington
Assistant Examiner: Negash; Kinfe-Michael
Attorney, Agent or Firm: Lowe, Price, LeBlanc & Becker

Optical telecommunication systems using phase-compensation interferometry wherein receiver units have N interferometer configurations each with a unique path length difference that is identical to a path length difference in one of N interferometer configurations at the corresponding transmitter units. The transmitter and receiver units separately and individually use N+1 arms, one of which serves as a reference common to the other N arms that along with the common reference arm form the N interferometer configurations of the transmitter and receiver units. N phase modulators, one in each of the N paths of the transmission units, are used to apply a separate and individual telecommunication signal (payload) to the portion of the light in that path. These N separate payloads may be of the same or different protocols. These N separate payloads may have the same or different bit rate/second. These N separate payloads may be digital or analog. These N payloads may be individually and separately dropped out or inserted at a drop/insert site. These N separate payloads may be used to increase the capacity of a transmission path by a factor of up to N. These N separate payloads may be used to employ lower bit rate/second electrons to produce a higher bit rate/second payload where the increased in bit rate/second is a factor of up to N.

DETAILED DESCRIPTION Accordingly, it is a primary object of the present invention to provide a new and improved optical telecommunication system.
A more specific object of the present invention is to provide an optical telecommunication system with a high capacity.
A further object of the present invention is to provide an optical telecommunication system with a reduced number of optical components for multiplexing various payloads on the same optical transmission path and demultiplexing various payloads from the same optical transmission path.
Still another object of the invention is to provide a simplified means for separately and individually optically inserting and dropping a portion of the optical payload in an optical transmission path.
An additional object of the present invention is to provide an optical telecommunication system wherein the increase in BER and/or reduction in useable transmission bandwidth due to dispersion in the transmission optical fiber is effectively eliminated.
Still an additional object of the present invention is to provide an optical telecommunication system wherein the spacing between optical regenerators can be increased as a result of reduced Brillioun scattering and/or optical dispersion.
Yet another object of the present invention is to provide an optical telecommunication system avoiding or minimizing the disadvantages discussed above with respect to various prior techniques and where optical paths, such as optical fibers, have more utility than simply serving as dumb links.
The above and other features of the present invention which will be more readily understood when the following detailed description is considered in conjunction with the accompanying drawings are realized by an optical telecommunication system having a first transmission unit operably connected to a first receiver unit by a transmission path having a first end adjacent to the first transmission unit and a second end adjacent to the first receiver unit.
The first transmission unit has one or more sources of radiant energy with a coherence length

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