Almaiman Ahmed, Song Haoqian, Pang Kai, Zhang Runzhou, Li Long, Zhao Zhe, Song Hao, Liu Cong, Manukyan Karapet, Zou Kaiheng, Zach Shlomo, Cohen Nadav, Tur Moshe, Willner Alan E
Opt Lett. 2020 Aug 15;45(16):4381-4384. doi: 10.1364/OL.398842.
We experimentally demonstrate the use of orbital angular momentum (OAM) modes as a degree of freedom to facilitate the networking functions of carrying header information and orthogonal channel coding. First, for carrying channel header information, we transmit a 10 Gb/s on-off keying (OOK) data channel as a Gaussian beam and add to it a 10 Mb/s OOK header carried by an OAM beam with the mode order =3. We recover the header and use it to drive a switch and select the output port. Secondly, for orthogonal channel coding, we configure transmitters to generate orthogonal spatial codes (orthogonal spatial beam profiles of OAM modes), each carrying an independent data stream. We measure the correlation between the OAM codes and demonstrate their use in a multiple access system carrying two 10 Gb/s OOK data channels. At the end of this Letter, we combine the concepts of using OAM modes for carrying channel header information and orthogonal channel coding in one experiment. We transmit a 10 Gb/s OOK data channel as a Gaussian beam and add to it two 10 Mb/s OOK header waveforms carried by different OAM codes. In the routing node, we recover one of the headers to drive the switch.
我们通过实验证明了使用轨道角动量（OAM）模式作为一种自由度，以促进携带头部信息和正交信道编码的网络功能。首先，为了携带信道头部信息，我们将10 Gb/s的开关键控（OOK）数据信道作为高斯光束进行传输，并将由模式阶数为3的OAM光束携带的10 Mb/s OOK头部添加到该数据信道中。我们恢复头部信息并用它来驱动一个开关并选择输出端口。其次，对于正交信道编码，我们配置发射机以生成正交空间码（OAM模式的正交空间光束轮廓），每个正交空间码携带一个独立的数据流。我们测量了OAM码之间的相关性，并展示了它们在携带两个10 Gb/s OOK数据信道的多址系统中的应用。在本信函的结尾，我们在一个实验中将使用OAM模式携带信道头部信息和正交信道编码这两个概念结合起来。我们将10 Gb/s的OOK数据信道作为高斯光束进行传输，并将由不同OAM码携带的两个10 Mb/s OOK头部波形添加到该数据信道中。在路由节点中，我们恢复其中一个头部来驱动开关。
