Zhao Weike, Peng Yingying, Cao Xiaoping, Zhao Shi, Liu Ruoran, Wei Yihui, Liu Dajian, Yi Xiaolin, Han Shangtong, Wan Yuanjian, Li Kang, Wu Guangze, Wang Jian, Shi Yaocheng, Dai Daoxin
State Key Laboratory for Modern Optical Instrumentation, Center for Optical & Electromagnetic Research, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Zhejiang University, Zijingang Campus, Hangzhou 310058, China.
Wuhan National Laboratory for Optoelectronics & School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, China.
Nanophotonics. 2022 Aug 15;11(18):4299-4313. doi: 10.1515/nanoph-2022-0319. eCollection 2022 Sep.
The multi-dimensional multiplexing technology is very promising for further increasing the link capacity of optical interconnects. A 96-channel silicon-based on-chip reconfigurable optical add-drop multiplexer (ROADM) is proposed and demonstrated for the first time to satisfy the demands in hybrid mode/polarization/wavelengthdivision-multiplexing systems. The present ROADM consists of a six-channel mode/polarization de-multiplexer, a 6 × 16 array of microring-resonator (MRR)-based wavelength-selective switches, and a six-channel mode/polarization multiplexer. With such a ROADM, one can add/drop optical signals to/from any channels of the multimode bus waveguide arbitrarily. For the designed and fabricated ROADM chip, there are more than 1000 elements integrated monolithically, including 96 MRRs, 576 waveguide crossings, 192 grating couplers, 96 micro-heaters, 112 pads, six polarization-splitter-rotators (PSRs), four asymmetric adiabatic couplers and four asymmetric directional couplers. For any channel added/dropped with the fabricated ROADM, the on-chip excess loss is about 5-20 dB, the inter-mode crosstalk is <-12 dB, and the inter-wavelength crosstalk is <-24 dB. The system experiments are demonstrated by using 10-GBaud quadrature phase shift keying (QPSK) signals, showing that the observed optical signal noise ratio (OSNR) power penalties induced by the ROADM are less than 2 dB at a BER of 3.8 × 10.
多维复用技术对于进一步提高光互连的链路容量非常有前景。首次提出并展示了一种96通道基于硅的片上可重构光分插复用器（ROADM），以满足混合模式/偏振/波分复用系统的需求。目前的ROADM由一个六通道模式/偏振解复用器、一个基于微环谐振器（MRR）的6×16阵列波长选择开关和一个六通道模式/偏振复用器组成。有了这样一个ROADM，人们可以任意地向/从多模总线波导的任何通道添加/下路光信号。对于设计和制造的ROADM芯片，单片集成了1000多个元件，包括96个MRR（微环谐振器）、576个波导交叉点、192个光栅耦合器、96个微加热器、112个焊盘、六个偏振分束器-旋转器（PSR）、四个非对称绝热耦合器和四个非对称定向耦合器。对于使用制造的ROADM添加/下路的任何通道，片上额外损耗约为5-20 dB，模间串扰小于-12 dB，波长间串扰小于-24 dB。使用10 Gbaud正交相移键控（QPSK）信号进行了系统实验，结果表明，在误码率为3.8×10时，ROADM引起的观测光信噪比（OSNR）功率代价小于2 dB。
