研究目的
To propose a new technique for the generation of ultra-wide and flattened optical frequency comb (OFC) based on serial cascading of a phase modulator and dual-driven Lithium-Niobate Mach Zehnder modulator (DD-LiNbO3-MZM).
研究成果
The proposed scheme successfully generates an ultra-wide and flattened OFC with over 60 carriers, demonstrating high TNR and low power deviation. The scheme is cost-efficient, scalable, and suitable for applications in coherent optical communications and WDM/OFDM passive optical networks.
研究不足
The scheme's performance is dependent on the careful adjustment of the RFSV and biasing voltages. The power deviation among the comb lines, although optimized, can vary, and the scheme's scalability with higher frequency spacings may require further optimization.
1：Experimental Design and Method Selection:
The proposed scheme involves the serial cascading of a phase modulator (PM) and a dual-driven Lithium-Niobate Mach Zehnder modulator (DD-LiNbO3-MZM) for OFC generation. The methodology includes adjusting the RF switching voltage (RFSV) and the signal frequency of the sinusoidal wave (RF) source to generate over 60 carriers.
2：Sample Selection and Data Sources:
A low power amplified RF source with a signal driving power of ~16.9dBm is used, and the power of CW laser is kept at 3dBm. The frequency spacing (FS) is varied (20GHz, 32GHz, 64GHz) to test the scheme's stability and scalability.
3：9dBm is used, and the power of CW laser is kept at 3dBm. The frequency spacing (FS) is varied (20GHz, 32GHz, 64GHz) to test the scheme's stability and scalability.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes a phase modulator, DD-LiNbO3-MZM, RF source, CW laser, optical filter, and simulation tools like Optisystem.
4：Experimental Procedures and Operational Workflow:
The RF source is split into three parts using a 1x3 fork, applied to the PM and DD-LiNbO3-MZM. The output is measured and visualized with an optical spectrum analyzer (OSA), optical time domain visualizer (OTDV), and optical power meter (OPM).
5：Data Analysis Methods:
The performance is analyzed in terms of cost efficiency, power deviations, TNR, optical signal to noise ratio, and number of achieved comb lines.
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