A Cascaded Tunable DFB Semiconductor Laser With Compact Structure Zhao, Yong ; Shi, Yuechun ; Li, Jia ; Liu, Shengping ; Xiao, Rulei ; Li, Lianyan ; Lu, Jun ; Chen, Xiangfei Abstract Publication: IEEE Journal of Quantum Electronics Pub Date: August 2018 DOI: 10.1109/JQE.2018.2837752 Bibcode: 2018IJQE...5437752Z