Abstract

An ultra-compact low-loss $1\times 4$ optical power splitter with a splitting ratio of 1∶2∶4∶8 is proposed and demonstrated on a 220-nm-thick silicon-on-insulator (SOI) platform at the C band. The splitter is based on two stages of a cascaded $1\times 3$ multimode interference (MMI) coupler and a $4\times 4$ MMI coupler. The footprint of the device is $124.0\mathrm{\mu m}\times 6.4\mathrm{\mu m}$, which is more compact than the traditional scheme of four-stage cascaded $1\times 2$ MMI couplers. Phase shifters based on taper waveguides are incorporated in the device as the connection of two MMI couplers. The fabricated device exhibits a 3 dB power difference with a deviation of less than 0.88 dB from 1530 nm to 1570 nm. The average power difference is 3.14 dB at the center of the C band with an insertion loss of 1.84 dB.

© 2019 Optical Society of America

Compact optical 90° hybrid based on a wedge-shaped 2 × 4 MMI coupler and a 2 × 2 MMI coupler on a thin-film lithium niobate platform

Yake Chen, Xiaojun Xie, Yang Sun, Wei Pan, and Lianshan Yan
Opt. Lett. 49(5) 1145-1148 (2024)

Ultra-compact optical 90° hybrid based on a wedge-shaped 2 × 4 MMI coupler and a 2 × 2 MMI coupler in silicon-on-insulator

Wei Yang, Mei Yin, Yanping Li, Xingjun Wang, and Ziyu Wang
Opt. Express 21(23) 28423-28431 (2013)

Ultra-compact low-loss variable-ratio 1×2 power splitter with ultra-low phase deviation based on asymmetric ladder-shaped multimode interference coupler

Zezheng Li, Xingrui Huang, Yang Liu, Yingxin Kuang, Huan Guan, Lifei Tian, Zhiyong Li, and Weihua Han
Opt. Express 28(23) 34137-34146 (2020)

Ultra-broadband and low-loss 3  dB optical power splitter based on adiabatic tapered silicon waveguides

Yang Wang, Shitao Gao, Ke Wang, and Efstratios Skafidas
Opt. Lett. 41(9) 2053-2056 (2016)

Subwavelength polarization splitter–rotator with ultra-compact footprint

Yingjie Liu, Shuai Wang, Yujie Wang, Wei Liu, Hucheng Xie, Yong Yao, Qinghai Song, Xinliang Zhang, Yu Yu, and Ke Xu
Opt. Lett. 44(18) 4495-4498 (2019)