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:
Jul. 12, 1994
Filed:
Mar. 19, 1993
Leonard G Cohen, Berkeley Heights, NJ (US);
AT&T Bell Laboratories, Murray Hill, NJ (US);
Abstract
An optical communication network includes a fiber-optic terminal system (FOTS) coupled to internal optical waveguides (or fibers) situated within a central office or terminal. These waveguides connect to external optical fibers. A new component is provided for optically coupling the FOTS to the waveguides. This component includes planar waveguides, referred to as 'main waveguides' formed on a substrate. Each main waveguide is coupled at one end to the FOTS and at the other end to an internal waveguide. Monitor waveguides, also formed on the substrate, are used to transmit OTDR signals to the main waveguides. Wavelength-division multiplexers formed on the substrate are used to couple monitor waveguides to corresponding main waveguides with respect to monitor wavelengths but not with respect to signal wavelengths.