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:
Jan. 09, 1996
Filed:
Nov. 18, 1992
Shigeru Ohshima, Kanagawa, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
An optical communication system suitable for selective reception of multiple services, which facilitates the adaptation of the already existing service network to an expansion of the service of the system by incorporating additional services, inexpensively, without causing the inconvenience to the subscribers of the system. In the system, the intensity modulated light signals with a first wavelength and the angle modulated light signals with a second wavelength are transmitted through the optical fiber communication lines in a form of multiplexed light signals. Then, the intensity modulated light signals in the multiplexed light signals are received and demodulated by using a direct detection, while the angle modulated light signals in the multiplexed light signals transmitted are received and demodulated from the multiplexed light signals. The selective detection of the angle modulated light signals is preferably made by a balanced optical heterodyne/homodyne receiver.