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:
Sep. 21, 1999
Filed:
Sep. 05, 1997
Frank H Levinson, Palo Alto, CA (US);
William R Freeman, Castro Valley, CA (US);
Daniel S Kane, San Francisco, CA (US);
Minh Q Vu, San Jose, CA (US);
Finisar Corporation, Mountain View, CA (US);
Abstract
A dual optical fiber transceiver, for use with first and second optical fibers, includes a laser transmitter for transmitting laser light into the first optical fiber, a laser light receiver for receiving laser light from the second optical fiber, and a controller coupled to the laser transmitter and laser light receiver. The controller includes a multi-protocol state machine for establishing the full duplex connection whenever the other device operates in compliance with either (A) a predefined 'on-off-on' signaling protocol for establishing full duplex connections, or (B) a second predefined signaling protocol for establishing full duplex connections. In a preferred embodiment, the predefined 'on-off-on' signaling protocol is the Open Fiber Control (OFC) protocol and the second predefined signaling protocol is a standard 'laser transmitter always on' protocol. In the preferred embodiment, the multi-protocol state machine disables operation of the laser transmitter whenever a loss of light condition is detected by the transceiver's laser light receiver that is not in compliance with the OFC protocol.