基于偏分复用技术的数字RoF系统研究

A digitalized radio over fiber(D-RoF) transmission system based on polarization division multiplexing

为有效缓解D-RoF系统高数字比特速率的不利影响,本文研究了偏振复用的D-RoF系统,能有效提高系统单波长的传输容量。分别在传统Stokes矢量检测和简化Stokes矢量检测下,采用一路偏振态向量追踪(OTV)与两路偏振态向量追踪(TTV)的DSP算法能够有效实现偏振解复用。仿真结果表明,两路偏振态向量追踪方法能有效降低正交偏振复用D-RoF系统的功率预算,达到系统最终误码率时,TTV算法需要的光功率要比OTV算法需要的光功率少2dBm。同时,可用TTV方法实现两路信号最小偏振复用度为76°的非正交偏振解复用,丰富了偏振复用的维度。该偏振复用D-RoF系统对其在未来5G无线传输和有线数字电视传输具有重要意义。

In order to relax the detrimental disadvantage from high bit rate in digitalized radio over fiber （D-RoF） system,a D-Rof system based on polarization division multiplexing is proposed, which can im- prove the transmission capacity of single wavelength channel in the system. In this paper, polarization de- multiplexing is realized by using one-way tracking vector （OTV） and two-way tracking vector （TTV） digital signal processing （DSP） algorithms respectively in traditional Stokes analyzer and simplified Stokes analyzer. The simulation results proves that two-way tracking vector algorithm can reduce power budget effectively in the orthogonal polarization division demultiplexing system,the needed optical power of two-way tracking vector algorithm is 2 dBm less than that of one-way tracking vector algorithm for reaching the best bit error rate （BER） performance. Meanwhile,the polarization demultiplexing is real- ized in a non-orthogonal polarization division demultiplexing system with a minimum polarization division multiplexing angle of 76° by using two-way tracking vector algorithm and traditional Stokes analyzer, which enriches the dimension of polarization division multiplexing greatly. The proposed polarization divi- sion multiplexing D-Rof system is of great significance to its application in 5G wireless transmission and cable digital TV transmission.