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:
Dec. 15, 1987
Filed:
Jun. 03, 1985
David R Porter, Roanoke, VA (US);
James H Bowen, Salem, VA (US);
John M Holland, Shawsville, VA (US);
ITT Electro Optical Products, a division of ITT Corporation, Roanoke, VA (US);
Abstract
An optical fiber communications link which by means of pulse-width-modulation (PWM) encoding supports either synchronous or asynchronous data transmission and operation over a wide range of data rates. The link utilizes a PWM encoder which accepts either synchronous (clock plus data) or asynchronous (data only) binary inputs and generates a PWM encoded waveform. This waveform is transmitted via an optical transmitter, optical channel (e.g., fiber optics) and optical receiver to the PWM decoder which reconstructs the binary inputs. The optical receiver contains a receiver circuit for assuring automatic gain control regardless of the duty cycle. In the synchronous mode of operation the unsymmetrical clock output is restored to symmetry by using a clock symmetry restoration technique.