GENERATING METHOD FOR OPTICAL DATA PULSE TRAIN

摘要

PURPOSE:To provide an optical data pulse train generating method which can generate the optical data pulse trains at a super-high speed and with no limitation by an electrical modulation speed. CONSTITUTION:An optical pulse 6 passes through a beam splitter 1 and is divided into plural diffracted beams by a diffraction grating 2. Then the diffracted beams are turned into the one-dimensional perallel beams by a collimator lens 3 and then made incident on a space modulator 4. The modulator 4 is divided into plural segments according to the number of information bits. Then only the transmitted beams reach a reflector 5 among those beams that are transmitted (bit 1) or cut off (bit 0) by the modulator 4. These transmitted beams are reflected on a stepped reflecting surface end the optical path difference, i.e., the time delay is caused between the beams at a fixed interval. Then these beams are condensed on the same optical path by a collimator lens 3 via the modulator 4. These condenced beams have the time delays at the fixed intervals end therefore a time series pulse train 7 is generated.