CMOS compatible ultra-compact MMI based wavelength diplexer with 60 Gbit/s system demonstration

We design and experimentally demonstrate an ultra-compact 1310/1550 run wavelength diplexer based on a multimode interference (MMI) coupler. The proposed device is designed at the first imaging length for 1550 nm wavelength resulting in an MMI length of only 41 mu m. In order to improve the extinction ratio, the output ports are made asymmetric in width. A low insertion loss (< 1dB) and high extinction ratio (> 20 dB) is measured at the two operating wavelengths. It also displays a wide 3-dB bandwidth of 100 nm centered around 1310 nm and 1550 nm wavelengths. Furthermore, an on-chip wavelength demultiplexing experiment carried out on the fabricated device, with a non-return-to-zero (NRZ) on-off keying (OOK) signal at 60 Gbit/s, shows clear eye diagrams for both the wavelengths. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

Automated summary

We designed and demonstrated an ultra-compact 1310/1550 run wavelength diplexer based on a multimode interference (MMI) coupler. The device showed low insertion loss and high extinction ratio, and displayed a wide 3-dB bandwidth. Additionally, clear eye diagrams were observed for both wavelengths in an on-chip wavelength demultiplexing experiment.