The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 18, 1995
Filed:
Oct. 15, 1992
Alan Huang, Middletown, NJ (US);
AT&T Corp., Murray Hill, NJ (US);
Abstract
An optical communication system includes an optical transmitter which transmits data symbols as pairs of optical pulses having 1) a first predetermined time separation representing a first inputted signal and 2) a second predetermined time separation representing a second inputted signal. The first optical pulse of each pair of pulses may be synchronized to a clock signal of the transmitter. The clock signal operates at a rate which insures that the inter-data symbol spacing is greater than the spacing between the pulses of a symbol pulse pair. The receiver generates a first output signal in response to a pair of pulses having a first predetermined time separation and generates a second output signal in response to a pair of pulses having a second predetermined time separation. The receiver combines the first and second output signal to recover a clock or strobe signal. Sagnac switches are used to implement optical AND circuits utilized in the transmitter and receiver.