Zhang Zanyun, Li Meixin, Zhang Kaixin, Liu Tianjun, Huang Beiju, Jiang Hao, Liu Yilin, Wang Qixin, Xing Jiaming, Yuan Bo, Liu Hongwei, Niu Pingjuan
School of Electronic and Information Engineering, Tiangong University, Tianjin 300387, China.
Tianjin Key Laboratory of Optoelectronic Detection Technology and Systems, Tiangong University, Tianjin 300387, China.
Micromachines (Basel). 2022 Feb 2;13(2):251. doi: 10.3390/mi13020251.
We propose and numerically demonstrate an 800 Gbps silicon photonic transmitter with sub-decibel surface-normal optical interfaces. The silicon photonic transmitter is composed of eight silicon Mach-Zehnder optical modulators and an interleaved AMMI WDM device. This WDM device comprises two 1 × 4 angled MMI and a Mach-Zehnder interferometer (MZI) optical interleaver with an apodized bidirectional grating which has about -0.5 dB coupling loss. Both the Mach-Zehnder electro-optical modulators and MZI optical interleaver regard the bidirectional grating coupler as vertical optical coupler and 3-dB power splitter/combiner. By importing the S-parameter matrices of all the components which have been carefully designed in simulation software, the circuit-level model of the optical transmitter can be built up. On this basis, the static and dynamic performance characterization were carried out numerically. For NRZ modulation, the optical transmitter exhibits the overall optical loss of 4.86-6.72 dB for eight wavelength channels. For PAM4 modulation, the optical loss is about 0.5 dB larger than that of NRZ modulation, which varies between 5.38-7.27 dB. From the eye diagram test results, the WDM silicon photonic transmitter can achieve single channel data transmission at 100 Gb/s NRZ data or 50 GBaud/s PAM4 symbol rate with acceptable bit error rate.
我们提出并通过数值验证了一种具有亚分贝表面法线光学接口的800 Gbps硅光子发射器。该硅光子发射器由八个硅马赫-曾德尔光调制器和一个交错式AMMI波分复用（WDM）器件组成。此WDM器件包括两个1×4倾斜多模干涉仪（MMI）和一个带有切趾双向光栅的马赫-曾德尔干涉仪（MZI）光交织器，该光栅具有约-0.5 dB的耦合损耗。马赫-曾德尔电光调制器和MZI光交织器均将双向光栅耦合器视为垂直光耦合器和3 dB功率分配器/合成器。通过在仿真软件中导入所有经过精心设计的组件的S参数矩阵，可以建立光发射器的电路级模型。在此基础上，进行了数值静态和动态性能表征。对于非归零（NRZ）调制，该光发射器在八个波长通道上的总光损耗为4.86 - 6.72 dB。对于四电平脉冲幅度调制（PAM4），光损耗比NRZ调制大约大0.5 dB，在5.38 - 7.27 dB之间变化。从眼图测试结果来看，该WDM硅光子发射器能够以100 Gb/s NRZ数据速率或50 GBaud/s PAM4符号速率实现单通道数据传输，且误码率可接受。
