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文章对上下行数据流分别使用差分相移键控(DPSK)和开关键控(OOK)不同的混合调制方式,通过比较下行采用不同调制码型,在没有色散补偿的情况下,实现了20 km、上下行10 Gbit/s对称速率的传输。结果表明,使用反向归零(IRZ)码的混合调制方式可以使下行数据流具有较高的消光比,上行数据流具有较好的色散容限,从而提高了传输系统的整体性能。
In this paper, different hybrid modulation schemes of differential phase shift keying (DPSK) and on-off keying (OOK) are used for the uplink and downlink data streams, respectively, and different modulation patterns are compared with the downlink. Without dispersion compensation, the system achieves 20 km , Uplink and downlink 10 Gbit / s symmetric transmission rate. The results show that hybrid modulation method using IRZ code can make the downstream data stream have higher extinction ratio and the upstream data stream has better dispersion tolerance, so as to improve the overall performance of the transmission system.