Labyrinth Optical Technologies, a subsidiary of Acacia Research, filed suit against Fujitsu alleging that Fujitsu’s IT and computing products infringe a patent related to optical communications (8,103,173).  Labyrinth has filed three prior suits since May 2012 against Alcatel-Lucent USA, Ciena Communications, and Oclaro.  Labyrinth filed a notice of voluntary dismissal in the suit against Ciena on December 21, 2012, and re-filed suit against the company later that week.  The patent-in-suit was originally assigned to Teradvance Communications, and the assignment to Acacia/Labyrinth has yet to be recorded by the USPTO.  1/7, Central District of California, assigned to Judge Andrew J. Guilford and referred to Magistrate Judge Jean P. Rosenbluth, 8:2013cv00030.