Design of enlarged-asymmetric-power single-mode silicon evanescent lasers with asymmetric distributed feedback gratings

Ge, Qing; Wang, Jun; Liu, Shuaicheng; Lin, Feng; Zhai, Hao; Liu, Chuanjiang; Chen, Yanan; Bai, Yiming; Liu, Hao; Cai, Shiwei; Huang, Yongqing; Ren, Xiaomin

doi:10.1016/j.optlastec.2024.110779

Cited by 2 publications

(1 citation statement)

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“…Here, the optical loss caused by gratings is neglected. The detailed calculation process is shown in [47]. We calculated the effective refractive indices of grating grooves and grating teeth distributed on the surface of 700 nm wide silicon waveguide shown in [37] by EME solver, and then calculated the grating coupling coefficient using equation (1).…”

Section: Simulation Models and Methodsmentioning

confidence: 99%

Design of high power evanescent quantum dot distributed feedback lasers on Si

Ge,

Wang,

Liu

et al. 2024

Phys. Scr.

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Great advancements in III–V/Si epitaxy have pushed quantum dot lasers to the forefront of silicon photonics. In this work, we designed the structures of evanescent coupled quantum dot distributed feedback lasers with asymmetric gratings, which made significant improvement in on-chip output power while maintaining single-longitudinal-mode stability. The optimal /4 phase-shift position (the ratio of the grating length from the rear-end of /4 phase-shift to the total grating length) from conventional position of 0.50 to 0.64 allows the ratio of the output power at both sides of silicon waveguide to be increased from 1.0 to 5.9. Moreover, the optimal duty cycle at one side of the phase-shift from 0.50 to 0.8 allows the ratio to be increased from 1.0 to 3.7. Meanwhile, the ratio could be dramatically improved from 1.0 to 9.2 by changed the duty cycle at one side of phase-shift to 0.7 while maintaining the phase-shift position of 0.64. With those designed structures, evanescent coupled quantum dot lasers could challenge the state-of-the-art bonded quantum well lasers and may eventually become ubiquitous and affordable for future commercial production.

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Section: Simulation Models and Methodsmentioning

confidence: 99%