Optical local area network employing microwave modulation techniques
Patent 4701904 Issued on October 20, 1987. Estimated Expiration Date: 
October 18, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 18, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2506672 Broadcasting systems with fibre optic transmission lines Local area network optical fiber data communication Service integrated communication transmission and interchange system Bidirectional dual network Patent #: 4630256 InventorApplicationNo. 06/788953 filed on 10/18/1985US Classes:398/72, Bidirectional398/118, OPTICAL COMMUNICATION OVER FREEE SPACE398/139, Including optical fiber or waveguide398/186, Intensity modulation398/60, Bus398/67, Bidirectional398/73BusExaminersPrimary: Safourek, Benedict V.Attorney, Agent or FirmInternational ClassesH04H 1/02 (20060101)H04J 14/02 (20060101) H04L 12/28 (20060101) AbstractThe present invention relates to an optical communication system wherein the entire microwave frequency bandwidth of the optical source-to-detector system is subdivided into a plurality of non-overlapping frequency bands or channels, and each user transmits and/or receives information either (a) on a separate fixed one of the channels, (b) on a free channel selectively assigned via control signals transmitted on a separate control channel at the time of initiation of a communication, or (c) on a channel randomly selected at the receiver by an associated user to receive a particular program. The present optical communication system can be configured to simultaneously broadcast multiple programs over separate channels for random selection by each user, or to achieve local and/or external two-way communications with the associated system users.Other References
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