研究目的
To realize a single-longitudinal-mode laser diode (LD) with high speed direct-modulation by proposing a coupled cavity DFB-LD with two phase-shifts.
研究成果
The proposed coupled cavity DFB-LD with two phase-shifts achieves a high resonance frequency of 71.3 GHz and a 3-dB down bandwidth of 95.9 GHz under specific conditions. The design parameters are modest and suitable for manufacturing, suggesting potential for high-speed direct modulation applications.
研究不足
The study relies on simulated results, and practical fabrication challenges are not addressed. The performance under varying environmental conditions is not explored.
1：Experimental Design and Method Selection:
The study proposes a coupled cavity DFB-LD with two phase-shifts for high-speed direct modulation. The design involves two regions connected in series, each with phase-shifted gratings. The phase-shift of the first region is ?π, and the second region is ?0.9π. The corrugation pitch of the second region is shorter than the first by 1.6 nm, with a grating coupling coefficient of 40 cm?1 and each region length of 300 μm.
2：9π. The corrugation pitch of the second region is shorter than the first by 6 nm, with a grating coupling coefficient of 40 cm?1 and each region length of 300 μm.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: The study uses simulated results to analyze the lasing characteristics of the proposed DFB-LD.
3：List of Experimental Equipment and Materials:
A commercial simulator PICS3D (Crosslight) is used for simulations. The layer structures and waveguide width are the same as in previous literature.
4：Experimental Procedures and Operational Workflow:
The simulator solves Poisson’s equation and two-dimensional Helmholtz equation self-consistently with a finite element method to simulate lasing characteristics.
5：Data Analysis Methods:
The resonance frequency and 3-dB down bandwidth are analyzed from the simulated results to evaluate the performance of the proposed DFB-LD.
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