研究目的
Investigating the performance of two different long-wavelength InP VCSEL technologies for high-capacity dense WDM networks.
研究成果
Lower chirp (tuneable) devices support much higher capacities for a higher number of crossed nodes, particularly for DSB modulation; however, SSB outperforms DSB modulation due to higher spectral efficiency. The combination of tuneable VCSELs with short-cavity-like modulation bandwidths could enable 50 Gb/s capacity for DSB DMT modulation under certain conditions.
研究不足
The study is limited to the specific technologies of short-cavity and MEMS-based VCSELs and does not explore other potential technologies or configurations.
1：Experimental Design and Method Selection:
The study compares high-bandwidth short-cavity VCSELs and MEMS-based widely-tuneable VCSELs using direct modulation with DMT modulation and coherent detection.
2：Sample Selection and Data Sources:
Chirp measurements were performed on a short-cavity 20-GHz long-wavelength VCSEL and an 8-GHz MEMS-based VCSEL.
3：List of Experimental Equipment and Materials:
VCSELs emitting in the C-band, dense wavelength division multiplexers in SOI chips, and a 25-GHz channel spacing WSS with 21-GHz FWHM.
4：Experimental Procedures and Operational Workflow:
The transmission performance was evaluated as a function of OSNR and the number of crossed nodes, considering both DSB and SSB DMT modulations.
5：Data Analysis Methods:
The performance was analyzed based on transmission capacities versus the number of crossed WDM filters for different OSNR levels.
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