Abstract
Low-cost and high-speed single-mode semiconductor lasers are increasingly required as wide-band access fiber communication expands in recent years. Here, a high-speed laterally coupled distributed feedback (LC-DFB) laser array is achieved based on a SiO2 planarization process. The device exhibits low threshold currents of about 12 mA and high slope efficiencies over 0.26 W/A. Stable single mode operation and high-speed performance are realized with side mode suppression ratios (SMSR) over 45 dB, and 3-dBe bandwidths exceed 14 GHz for all four channels. Such a high-speed and process simple LC-DFB laser array shows great potential to the low-cost fiber communication networks.
Highlights
High-speed optical communication develops rapidly with the rapid increase of the amount of data
laterally coupled distributed feedback (LC-distributed feedback (DFB)) lasers with good static performance, e.g., side mode suppression ratio (SMSR), were reported [3,4,5,6]
There are only a few reports about the high frequency performance, e.g., modulation bandwidth [7,8,9]. It is a trade-off between the single mode performance and the modulated bandwidth, and it is especially challenging to achieve a high modulation bandwidth for Laterally coupled (LC)-DFB lasers, which often suffer from a low coupling coefficient and have a long cavity to select longitudinal mode
Summary
Qichao Wang 1 , Jian Wang 1,2, *, Changzheng Sun 1,2 , Bing Xiong 1,2 , Yi Luo 1,2,3, *, Zhibiao Hao 1,2 , Yanjun Han 1,2,3 , Lai Wang 1 , Hongtao Li 1 and Jiadong Yu 1,2,3.
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