Fujitsu Again Sues Tellabs Over Optical Network Patents

Law360, Los Angeles (July 12, 2013, 3:53 PM EDT) -- Fujitsu Ltd. on Friday slapped Tellabs Inc. with another patent infringement suit in the long-running legal battle between the companies, accusing it of infringing a pair of Fujitsu patents relating to optical communications systems.

Fujitsu, based in Japan, alleges in Friday's complaint that Naperville, Ill.-based Tellabs has infringed and continues to infringe two of its patents by manufacturing and selling various products featuring optical signal amplifiers, including the Tellabs 7100 and 7100 Nano Optical Transport Systems.

The patents at issue — U.S. Patent Numbers 5,521,737 and 5,526,163 — are both...
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