C-Band optical 90-degree hybrid using thin film lithium niobate
Heyun Tan, Jing Wang, Wei Ke, Xian Zhang, Zikai Zhao, Zhongjin Lin, Xinlun Cai
Abstract
The integrated optical 90-degree hybrid is a crucial component for coherent receivers. Here, we simulate and fabricate a 4 × 4 multimode interference coupler as a 90-degree hybrid using thin film lithium niobate (TFLN). The device features low loss (0.37 dB), high common mode rejection ratio (over 22 dB), compact footprint, and small phase error (below 2°) within the whole C-band experimentally, which is promising for integration with coherent modulators and photodetectors for TFLN-based high-bandwidth optical coherent transceivers.
Topics & Concepts
Lithium niobateOpticsMaterials scienceMulti-mode optical fiberBandwidth (computing)OptoelectronicsPhotodetectorInterference (communication)Optical fiberPhysicsTelecommunicationsComputer scienceChannel (broadcasting)Photonic and Optical DevicesAdvanced Fiber Laser TechnologiesOptical Network Technologies