| 摘要 |
A high speed optical switching device (1) comprises a waveguide arrangement, inc orporating a pn junction, with a large bondpad (11) for the purposes of increasing the capacitance presented by the dev ice. Data and control signals can be input at an input port (8) of the waveguide arrangement, presence of the control signal oper ating to modify the optical path length of the device for the data signal. By incorporating the device in an interferometer arr angement, or by exploiting a Fabry-Perot cavity of the device, it can be used to transmit the data signal selectively, for instance so as to demultiplex a time multiplexed optical communications signal. The high capacitance provides very short recovery times so that data rat es of 10 GHz and substantially above can be accomodated.
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