提出了一种基于小波包变换正交码的多电平正交编码的无源光网络（PON）中上行信号复用和传输新方法，将PON系统中各个不同的光网络单元（ONU）用户用小波变换正交码来进行调制、复用和传输，能够实现各个不同ONU用户共享一个波长。由于采用了小波变换编码，可以实现数量很多ONU用户同时上行，在ONU端不需要突发光模块以及多波长激光器，因而成本低，传输速率高，接入数量多。给出了基于该方法的上行系统调制、复用和传输的结构模型，并仿真了传输速率为1.25 Gb/s和10 Gb/s下不同路ONU用户上行传输，仿真结果表明，最大可以实现上行32路，每路10 Gb/s，总传输速率达到320 Gb/s的高速PON系统。

An upstream date transmission method from optical network units (ONUs) to the optical line terminal (OLT) based on wavelet packet multi-level orthogonal coding in passive optical networks (PON) is proposed and studied. Each ONU can be assigned a special coding based on the wavelet packet coding method to share a wavelength. As the wavelet packet coding method is used, the number of ONU can be very large. And there are no need for the burst mode transmitter/receiver module and multi-wavelength lasers. So the proposed system has the advantages of low cost, high data transmission rate and large access number. This upstream system architecture model is established and simulated at the transmission rate of 1.25 Gb/s and 10 Gb/s. Simulation results show 32 ONUs, where each ONU is with a data rate of 10 Gb/s, and the total transmission rate is up to 320 Gb/s.