Optical signal control method and apparatus

Details Optical signal control method and apparatus Optical signal control method and apparatus

G - Physics

02

F

345/60

G02F 1/01 (2006.01) G02F 1/035 (2006.01)

Patent

CA 1301899

ABSTRACT OPTICAL SIGNAL CONTROL METHOD AND APPARATUS A method and apparatus for controlling the polarisation of an optical signal has many applications, including in coherent systems, eg heterodyne detectors. Four birefringent elements (19, 21, 23, 25) in series are arranged to rotate the state of polarisation (SOP) alternately about orthogonal axes on a Poincare sphere. A controller enables time varying initial and final polarisation states S, S' to be tracked. It also ensures that the birefringence limits of the elements are never reached by carrying out an adjustment procedure. A reduction by a full revolution (2.pi.) for one element (eg 19) can be achieved by varying the transformations of the other elements by not more than .pi..

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