Optical switch

Details Optical switch Optical switch

G - Physics

02

F

G02F 1/01 (2006.01) G02F 1/21 (2006.01) G02F 1/35 (2006.01)

Patent

CA 2109464

- 15 - Abstract Optical Switch For so-called add-drop multiplexers, fast optical switch- es (SCH) are needed which can switch optical signal waves stemming from different signal sources. Known optical switches include an interferometer in which the signal wave is split into two signals, and in which an optical switching pulse is superimposed on one of the signals. Because of the Kerr effect, in- terference signals can be generated which can be switched in an optical coupler in a controllable manner to a predetermined output. The signals and the switching pulse have the same direction of polariza- tion, which may cause may cause switching problems with signals from different signal sources. The gist of the invention therefore lies in the use of switching pulses which consist of quasi-depolarized light. Such switching pulses are advantageously gene- rated in two switching-pulse sources (SQ) in which two polarized light beams are superimposed orthogonally. In an optical waveguide (LWL1, SP) with a nonlinear refractive index, the switching pulse assumes a con- stantly varying polarization state. (Fig. 1)

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