Abstract

Optical delay lines control the flow of light in time, introducing phase and group delays for engineering interferences and ultrashort pulses. Photonic integration of such optical delay lines is essential for chip-scale lightwave signal processing and pulse control. However, typical photonic delay lines based on long spiral waveguides require extensively large chip footprints, ranging from mm² to cm² scales. Here we present a scalable, high-density integrated delay line using a skin-depth engineered subwavelength grating waveguide, i.e., an extreme skin-depth (eskid) waveguide. The eskid waveguide suppresses the crosstalk between closely spaced waveguides, significantly saving the chip footprint area. Our eskid-based photonic delay line is easily scalable by increasing the number of turns and should improve the photonic chip integration density.

© 2023 Optica Publishing Group

Mode-evolution-based ultra-broadband polarization beam splitter using adiabatically tapered extreme skin-depth waveguide

Md Borhan Mia, Syed Z. Ahmed, Nafiz Jaidye, Ishtiaque Ahmed, and Sangsik Kim
Opt. Lett. 46(18) 4490-4493 (2021)

Ultra-high extinction ratio polarization beam splitter with extreme skin-depth waveguide

Syed Z. Ahmed, Ishtiaque Ahmed, Md Borhan Mia, Nafiz Jaidye, and Sangsik Kim
Opt. Lett. 46(9) 2164-2167 (2021)

On-chip optical true time delay lines based on subwavelength grating waveguides

Yue Wang, Hao Sun, Mostafa Khalil, Wei Dong, Ivana Gasulla, José Capmany, and Lawrence R. Chen
Opt. Lett. 46(6) 1405-1408 (2021)

Programmable MZI based on a silicon photonic MEMS-tunable delay line

Myung S. Hong, Min G. Lim, Dong U. Kim, Man J. Her, Young J. Park, Dong J. Choi, Youngjae Jeong, Jongwoo Park, Seungjun Han, Young-Hoon Chun, Seok Chan Eom, Sangyeol Oh, Kyoungsik Yu, and Sangyoon Han
Opt. Lett. 48(21) 5611-5614 (2023)

All-silicon TM polarizer covering the 1260–1675 nm bandwidth using a band engineered subwavelength grating waveguide

Lei Zhang, Zhenzhao Guo, Xiaofei Gu, Jinbiao Xiao, Ting Feng, and Shengbao Wu
Opt. Lett. 48(13) 3431-3434 (2023)