| 摘要 |
In optical transmission systems it is desirable to increase the bit rate of digital signals to, e.g., 40 Gb/s and more. In such systems there is an upper bit-rate limit above which conventional directly modulated lasers and their drive electronics cannot be employed. An optical transmission system is disclosed in whose optical transmitter (1) an electric multilevel signal (V) composed of two electric digital signals (V1, V2) modulates a semiconductor laser (4), so that an optical multilevel signal (V) is transmitted. The optical receiver (2) contains a decision circuit (7) which recovers the digital signals (V1, V2).
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