Deng M L, Jiang N, Duan X, Giddings R P, Yi X W, Cao B Y, Mansoor S, Qiu K, Tang J M
Opt Express. 2015 Jan 12;23(1):373-83. doi: 10.1364/OE.23.000373.
Utilizing low-cost, 2.2GHz modulation bandwidth, uncooled and standalone directly modulated VCSEL (DM-VCSEL)-based real-time dual-band optical OFDM (OOFDM) transmitters, aggregated 16.375Gb/s transmissions of OOFDM signals having bandwidths approximately 3.8 times higher than the VCSEL manufacturer-specified modulation bandwidths, are experimentally demonstrated, for the first time, over 200m OM2 MMF links based on intensity modulation and direct detection. The aggregated signal transmission capacities of the aforementioned links vary by just 8% for various OM2 MMFs ranging from 100m to 500m, and by just 10% over a 1GHz passband carrier frequency detuning range. Such dual-band OOFDM adaptability-induced excellent performance robustness and large passband frequency tunability can significantly relax the requirements on VCSEL modulation bandwidth for achieving specific transmission performances for cost-sensitive application scenarios such as data centers.
利用低成本、2.2GHz调制带宽、非制冷且独立的直接调制垂直腔面发射激光器（DM-VCSEL）实时双波段光正交频分复用（OOFDM）发射机，在基于强度调制和直接检测的200米OM2多模光纤链路中，首次通过实验证明了聚合传输速率为16.375Gb/s的OOFDM信号，其带宽比VCSEL制造商规定的调制带宽高约3.8倍。对于100米至500米的各种OM2多模光纤，上述链路的聚合信号传输容量仅相差8%，在1GHz通带载波频率失谐范围内仅相差10%。这种双波段OOFDM适应性带来的出色性能稳健性和大的通带频率可调性，可以显著放宽对VCSEL调制带宽的要求，以满足数据中心等对成本敏感的应用场景实现特定传输性能的需求。
