为实现低成本、长距离以及大容量的数据传输场景, 设计了一种无多进多出(MIMO)模分复用(MDM)带宽可调的双向光纤传输系统, 利用6模式选择光子灯笼(PL)分别作为模式复用/解复用器, 选取LP21和LP01 2个非简并模式作为正向传输信道, LP02模式和LP01模式作为反向传输信道, 同时通过光开关控制选择LP11的2个简并模式作为正反向传输信道, 从而实现12.5 km的双向带宽可调传输。该系统为低成本、长距离以及大容量的数据传输场景提供了解决方案。

In order to achieve low-cost, long-distance and large capacity data transmission scenarios, a fiber-optic bidirectional optical fiber transmission system without multiple in multiple out(MIMO) mode division multiplexing(MDM) adjustment bandwidth is designed. Using six modes to select the photon lantern(PL) as the mode multiplexer and demultiplexer respectively, LP21 and LP01 are selected two non degenerate modes as forward transmission channels, LP02 mode and LP01 mode as reverse transmission channels. At the same time, two degenerate modes of LP11 are selected as forward and reverse transmission channels through optical switch control, thus realizing 12.5 km bidirectional bandwidth adjustable transmission. The system provides a solution for low-cost, long-distance and large capacity data transmission scenarios.