Acknowledgement
This work was supported by the Korea Innovation Foundation funded by Korea Government (MSIT) (no. 2021-DD-RD-0082, Commercialization of 8 wavelength DBR-EAM chip with modulation rate of 25 Gb/s per channel), the ICT R&D program MSIP/IITP (no. 2020-0-00847, Development of 5G+ mobile fronthaul transport technology), and the Electronics and Telecommunication Research Institute Grant funded by the Korea Government (no. 21YB1810/21EB1210, Development of DBR-EAM LD chip technology for commercialization).
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