研究目的
Investigating the design and fabrication of a π equivalent phase-shifted sampled Bragg grating (SBG) semiconductor laser with a controlled distributed phase shift for application in dense wavelength-division multiplexing (DWDM) systems.
研究成果
The study successfully demonstrates a π equivalent phase-shifted DFB laser with controlled distributed phase shift, offering continuous wavelength tuning and stable single-mode operation. This laser is a promising candidate for multiwavelength laser arrays in future DWDM systems, with potential for further optimization in tuning range and output power stability.
研究不足
The study is limited by the technical constraints of current injection and thermal effects on the laser's performance. The tuning range and output power stability are areas for potential optimization.
1：Experimental Design and Method Selection:
The study involves the design and fabrication of a π equivalent phase-shifted SBG semiconductor laser using the reconstruction-equivalent-chirp (REC) technique. The laser is divided into three sections with the same length to introduce a distributed phase shift by injecting different currents into the side and middle sections.
2：Sample Selection and Data Sources:
The laser's performance is measured under varying current injections to the middle and side sections, with optical spectra recorded by an AQ6370 optical spectrum analyzer.
3：List of Experimental Equipment and Materials:
The laser consists of an n-type InP contact layer, a grating layer, a separate-confinement heterostructure multi-quantum well layer, and a p-type InP contact layer. Equipment includes a thermal electronic cooler for temperature control and an AQ6370 optical spectrum analyzer.
4：Experimental Procedures and Operational Workflow:
The laser's lasing wavelength, side mode suppression ratio (SMSR), and output power are measured as the current to the middle section is varied while keeping the total current constant or varying the current to the side sections.
5：Data Analysis Methods:
The study analyzes the lasing wavelength's tunability, SMSR, and output power variation under different current injection scenarios to evaluate the laser's performance for DWDM applications.
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