论文部分内容阅读
针对光纤模分复用传输系统中模式耦合串扰问题,设计并制备了一种新型少模光纤,其较高的模式差分群延时保证各模式信道独立传输.在此基础上,提出一种级联多输入多输出(MIMO)延时均衡算法,进一步减少源于模式复用器和解复用器的模式串扰,提高基于少模光纤的模分复用传输系统的传输距离和传输容量.与传统MIMO均衡算法相比,级联MIMO延时均衡算法在没有显著增加计算复杂度的条件下,能够应用于模式差分群延时很大的模分复用传输系统.对单信道传输速率为40 Gbps的四相相移键控两模复用传输系统进行仿真,经40km少模光纤传输后,采用级联MIMO均衡算法较普通MIMO均衡算法有1.7dB的质量因子的提升.仿真结果证明,使用少模光纤和级联MIMO延时均衡算法能够有效地消除模分复用信号间的串扰,有望在下一代大容量光纤传输系统中获得推广应用.
Aiming at the problem of mode coupling crosstalk in optical fiber modular transmission system, a new type of low-mode optical fiber is designed and fabricated. The higher mode differential group delay ensures the independent transmission of each mode channel. On this basis, Multiple Input Multiple Output (MIMO) delay equalization algorithm to further reduce the mode crosstalk from the mode multiplexer and demultiplexer to improve the transmission distance and transmission capacity of the modular optical transmission system based on less mode optical fiber. Compared with the MIMO equalization algorithm, the cascaded MIMO delay equalization algorithm can be applied to the MDP system with large mode difference group delay without any significant increase in computational complexity.On the basis of the single-channel transmission rate of 40 Gbps Quadrature phase-shift keying (MIMO) system with two-mode and multi-phase transmission system is simulated.The quality factor of 1.7dB is improved by the cascaded MIMO equalization algorithm compared with the ordinary MIMO equalization algorithm after transmitted by 40km less mode fiber.The simulation results show that using less The modular optical fiber and cascaded MIMO delay equalization algorithm can effectively eliminate the crosstalk between the signal and the multiplexed signal and is expected to be popularized and applied in the next generation of high-capacity optical fiber transmission system.