G - Physics
02
B
G02B 27/10 (2006.01) G02B 27/28 (2006.01) G02F 1/35 (2006.01) H04B 10/135 (2006.01) H04J 14/08 (2006.01)
Patent
CA 2078994
An optical apparatus comprising: a first optical coupling means (32) having a first (4, 6) and a second (34, 36) pair of opti- cal communication ports in which substantially equal portions of an optical signal received at a port of one pair of ports are cou- pled to each port of the other pair of ports; an optical waveguide means (38) optically coupling the second pair of ports such that an optical signal leaving either one of the second pair of ports in a first polarization state arrives at the other in a second polariza- tion state substantially orthogonal to the first polarization state; a second optical coupling means (12) for coupling an optical sig- nal at a second wavelength to the optical waveguide so as to propagate along at least a portion of it in one direction only; and a first and second polarizing beam splitters (8, 14) optically coupled to a respective one of the first pair of ports.
Blow Keith James
Doran Nicholas John
Nelson Brian Peter
British Telecommunications Public Limited Company
Gowling Lafleur Henderson Llp
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