Method and apparatus for the transmission fault detection in...

Details Method and apparatus for the transmission fault detection in... Method and apparatus for the transmission fault detection in...

2008-01-22

2008-01-22

Chan, Jason (Department: 2613)

Optical communications

Multiplex

Broadcast and distribution system

C398S032000, C398S058000, C398S010000, C398S100000, C398S099000, C398S076000, C398S066000, C398S198000

Reexamination Certificate

active

07321730

ABSTRACT:
An optical network unit (ONU) interconnected by passive optical network (PON) equipment to an optical line terminal (OLT) is identified using secondary modulation of the optical carrier to impress an identifier of the ONU onto the carrier. This resolves a recurring ONU failure mode detection problem caused by failure of a laser driver that causes the ONU to be stuck in an on state.

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patent: 6504636 (2003-01-01), Seto et al.
patent: 2002/0075534 (2002-06-01), Feldman
Horak, Ray, “Passive Optical Network (PON), PON is a passive, point-to-multipoint access network based on ATM that uses small, inexpensive, low-power optical splitters”,CommWeb, pp. 1-4., May 17, 2002.
Hranilovic, Steve, “Signal Constellation Design for Optical Intensity Modulated Channels”,Department of Electrical&Computer Engineering, University of Toronto, 10 King's College Rd., Toronto, Ontario, M5S 3G4, Canada, 1 page, ISIT 2001, Washington, D.C., Jun. 24-29, 2001.

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