| 摘要 |
A device for digitising an electrical signal comprising (A) at least two continuous wave lasers each being adapted to produce light at a different wavelength; (B) a dispersive optical chopper adapted to chop the output of each of the lasers into optical pulse trains, introduce a predetermined delay between each of the optical pulse trains and to combine the optical pulse trains into a single optical path; (C) a modulator having an input port adapted to receive the output of the dispersive optical chopper, an output port and at least one optical path extending therebetween, the modulator being adapted to receive a microwave signal and to modulate the amplitude of the optical signal in the optical path in response to the microwave signal; (D) an optical splitter for splitting the signal received from the output port of the modulator into a plurality of wavelength dependent signal paths; and (E) a plurality of analogue to digital converters each connected at least one wavelength dependent signal path for converting the received optical signal to a digital signal. |
