4 $\times $ 10-Gb/s MIMO-Free Polarization and Mode Group Multiplexing for Data Center Applications

The 4×10-Gb/s polarization- and mode group-multiplexed transmission without multiple-input-multiple-output equalization for data center applications is experimentally demonstrated, for the first time, over a 127-m panda-type polarization-maintaining few-mode fiber. A polarization crosstalk of less than -22.0 dB and a bending loss of <;0.08 dB for one loop with a 5-mm radius were achieved.