Willner Asher J, Ren Yongxiong, Xie Guodong, Zhao Zhe, Cao Yinwen, Li Long, Ahmed Nisar, Wang Zhe, Yan Yan, Liao Peicheng, Liu Cong, Mirhosseini Mohammad, Boyd Robert W, Tur Moshe, Willner Alan E
Opt Lett. 2015 Dec 15;40(24):5810-3. doi: 10.1364/OL.40.005810.
We explore the use of the spatial domain as a degree of freedom for data encoding and channel hopping. We experimentally demonstrate data encoding at 20 Gbit/s using four possible orbital angular momentum (OAM) modes. The influence of mode spacing and time misalignment between modal channels on the switching crosstalk and bit-error rates is investigated. We find that the use of adjacent modes with a mode spacing of one introduces an extra power penalty of 3.2 dB compared with a larger mode spacing. Moreover, we demonstrate reconfigurable hopping of a 100 Gbit/s quadrature-phase-shift-keying (QPSK) data channel between four OAM modes with a 2 ns switching guard time. The results show that the power penalties for different hopping rates and mode spacings are less than 5.3 dB.
我们探索将空间域用作数据编码和信道跳变的一个自由度。我们通过实验证明了使用四种可能的轨道角动量（OAM）模式以20 Gbit/s进行数据编码。研究了模态信道之间的模式间距和时间失准对切换串扰和误码率的影响。我们发现，与更大的模式间距相比，使用模式间距为1的相邻模式会引入3.2 dB的额外功率代价。此外，我们展示了在具有2 ns切换保护时间的情况下，100 Gbit/s正交相移键控（QPSK）数据信道在四种OAM模式之间的可重构跳变。结果表明，不同跳变速率和模式间距的功率代价小于5.3 dB。
