研究目的
Investigating the high-speed and high-power performance of directly modulated DFB lasers (DML) with reduced parasitic capacitance for optical communication applications.
研究成果
The study successfully demonstrated that reducing the parasitic capacitance of DML can achieve high-speed optical modulation without reducing the device length, enabling high-saturation optical output power. This technique is promising for future high-speed optical communication applications.
研究不足
The study is limited by the thermal dissipation limit imposed on the waveguide, which affects the output power level. Additionally, the short cavity length devices were saturated at lower injection currents, indicating a trade-off between speed and power.
1：Experimental Design and Method Selection:
The study focused on reducing the parasitic capacitance of DML to achieve high-speed optical modulation. Different cavity lengths (200μm and 500μm) were fabricated and tested.
2：Sample Selection and Data Sources:
Two lengths of DML waveguides were used to investigate the effect of cavity length on performance.
3：List of Experimental Equipment and Materials:
A reversed ridge waveguide (RRW) and thick BCB planarization were used for reducing parasitic capacitance. CPW line was defined for bridging the waveguide of DML.
4：Experimental Procedures and Operational Workflow:
The optical output power and -3dB bandwidth were measured at room temperature. High-speed data transmission was tested using a non-return-to-zero (NRZ) pseudo-random binary sequence (PRBS).
5：Data Analysis Methods:
The capacitance with bias voltage (C-V) was measured to characterize the high-speed performance. The electro-optical frequency response of DML was measured using a high-speed vector network analyzer (VNA) and a high-speed photodetector.
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