| 摘要 |
PURPOSE:To increase modulation speed by using the parallelism and high-speed limiter characteristics of an optical bistable element and a delaying and composing means for light pulses. CONSTITUTION:Optical modulating means 31-38 perform high-speed modulation and then all of obtained light signals have rounded waveforms. For the purpose, the optical bistable element 4 is arranged between the optical modulating means 31-38 and delaying and composing means 5 and then the rounded waveforms are all shaped into sharp pulses by the parallelism and high-speed limiter characteristics. Then, plural output pulses of the optical bistable element 4 are delayed differently by the delaying and composing means 5 and then put together, so that a time-series signal which contains all plural pulses in one cycle of the modulation speed of the optical modulating means 31-38 is outputted. Therefore, even if the modulation speed of the optical modulating means is slow, a modulation speed which is increased by the number of light signals in use is obtained finally. Thus, the modulation speed is increased.
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