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提出了一种复用技术——正交波形复用(OGDM),并将其应用于无源光网络(PON)系统中作为上行信号传输。在本方法中,对于N个光网络单元(ONU)端的PON系统,先将N个ONU端信号分别通过强度调制或无载波调幅调相(CAP)技术,调制到N个两两相互正交电波形上,使“1”码对应有波形,“0”码对应无波形,然后再将各路不同的波形信号分别调制到每个ONU用户的激光器上,这些激光器的波长可以是同一个波长;通过光分配网络(ODN)单元合路后上行传输到光线路终端(OLT)端,在OLT端采用相关接收的方法,把接收到的信号和OLT端的本地正交波形作相关运算,利用正交波形的正交性来区分不同ONU端的用户信息。仿真显示在理想情况下,32路ONU信号当采用外调制方式时,每路单独占用10Gb/s,总带宽为320Gb/s,可以传输20km。
A multiplexing technique, Orthogonal Waveform Multiplexing (OGDM), is proposed and applied to the PON system as uplink signal transmission. In this method, for N optical network unit (ONU) end PON systems, first, N ONU side signals are respectively modulated by intensity modulation or carrierless amplitude modulation phase modulation (CAP) technology to modulate N pairs of mutually orthogonal power Waveform, “1 ” code corresponding to the waveform, “0 ” code corresponding to no waveform, and then each of the different waveform signal modulation to each ONU user’s laser, the laser wavelength can be The same wavelength; after being combined by the optical distribution network (ODN) unit, the uplink is transmitted to the optical line terminal (OLT) side, and the OLT side adopts the related receiving method to correlate the received signal with the local orthogonal waveform at the OLT side , The orthogonality of orthogonal waveforms is used to distinguish user information of different ONUs. The simulation shows that under ideal conditions, 32 ONU signals occupy 10Gb / s each with external modulation. The total bandwidth is 320Gb / s and can transmit 20km.