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无源光网络(PON)通常采用二进制非归零码(NRZ)调制技术,该技术存在如下缺点:系统的频谱效率最低,对无源光网络中相邻射频(RF)电视信道产生拉曼串扰影响,以及高速传输时光纤色散代价大。为了克服上述问题,采用了将正交频分复用(OFDM)调制技术应用于PON系统的解决方法。对基于强度调制和雪崩光电二极管(APD)直接检测的10Gb/s 16位正交幅度调制(16QAM)OFDM-PON系统进行了100km的下行方向传输实验。实验结果表明,在误码率(BER)水平为1×10-3的条件下,系统接收灵敏度可以达到-26dBm。在1556nm波段,传输距离小于100km的情况下,标准单模光纤的色度色散对该系统传输性能的影响可以忽略。
Passive Optical Network (PON) usually adopts binary non-return to zero (NRZ) modulation technology, which has the following disadvantages: the lowest spectral efficiency of the system and Raman crosstalk to adjacent radio frequency (RF) television channels in a passive optical network Impact, and high-speed transmission of fiber dispersion costly. In order to overcome the above problems, a solution to apply Orthogonal Frequency Division Multiplexing (OFDM) modulation technology to the PON system is adopted. 100km downlink transmission experiment was carried out on 10Gb / s 16-bit Quadrature Amplitude Modulation (16QAM) OFDM-PON system based on intensity modulation and avalanche photodiode (APD) direct detection. The experimental results show that under the condition of bit error rate (BER) of 1 × 10-3, the system receiving sensitivity can reach -26dBm. In 1556nm band, the transmission distance is less than 100km, the standard single-mode optical fiber chromatic dispersion on the transmission performance of the system can be ignored.