Laser & Optoelectronics Progress, Volume. 55, Issue 6, 061408(2018)

Bandwidth of Push-Pull Modulated Distributed Feedback Lasers

Ning Zhou1、1; , Chengliang Zuo、2*; *; , Zekun Lin2、2; , Mingwen Lan2、2; , Zhixing Dong2、2; , Cheng Ke2、2; , and Junqiu Qi2、2;
Author Affiliations
  • 1 Accelink Technologies Co., Ltd., Wuhan, Hubei 430074, China
  • 2 Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
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    In order to improve the passband flatness and 3 dB modulation bandwidth of the distributed feedback (DFB) lasers, we study the relationship between the device parameters (such as grating coupling coefficient, cavity length and electrode ratio) and the frequency response of 1 st and 2 nd order grating push-pull modulated DFB lasers by using one-dimensional traveling wave model. The parameters used in the simulated model are extracted from the photoelectric characteristics of the actual devices. The simulated results show that, for the DFB lasers with 1 st order grating structure, the push-pull modulation bandwidth is 12 GHz larger than the single-electrode direct modulation bandwidth at the appropriate grating coupling coefficient, cavity length and electrode ratio. For the DFB lasers with 2 nd order grating structure, the push-pull modulation bandwidth is 40 GHz larger than the single-electrode direct modulation bandwidth. Besides, the passband flatness of the 1 st order and 2 nd order grating push-pull modulated lasers is much better than that of the ordinary direct modulation lasers. In addition, the results of the experiments show a substantial increase of the bandwidth with push-pull modulation, even for general design of active region.

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    Ning Zhou, Chengliang Zuo, Zekun Lin, Mingwen Lan, Zhixing Dong, Cheng Ke, Junqiu Qi. Bandwidth of Push-Pull Modulated Distributed Feedback Lasers[J]. Laser & Optoelectronics Progress, 2018, 55(6): 061408

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    Paper Information

    Category: Lasers and Laser Optics

    Received: Nov. 24, 2017

    Accepted: --

    Published Online: Sep. 11, 2018

    The Author Email: Zuo Chengliang ( zuochengliang@hust.edu.cn)

    DOI:10.3788/LOP55.061408

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