研究目的
Investigating a new method to generate highly flat optical frequency combs (OFCs) based on a supper-Gaussian pulse and sinusoidal phase modulation (SPM).
研究成果
The proposed method can generate up to 64 comb lines with a perfect flatness of ~1 dB, demonstrating a significant improvement over conventional methods.
研究不足
The method requires complicated manipulation with highly correlated devices and limits the number of comb lines to 64 lines using an intensity modulator and two phase modulators.
1：Experimental Design and Method Selection:
The proposed scheme for flat OFC generation is based on two phase modulators (PM) and a dual drive Mach Zehnder modulator (DD-MZM). The light source from an external cavity laser is strongly chirped by two cascaded phase modulators driven with a maximum RF power of 30 dBm at 10 GHz. To shape a super-Gaussian narrow pulse, the upper and lower arms of the DD-MZM (with Vpi of 5 V) are biased and driven by an 10 GHz sinusoidal signal at ~24 dBm and a frequency-doubled signal (20 GHz) at ~14 dBm, respectively.
2：Sample Selection and Data Sources:
The optical pulses obtained from the conventional (using two intensity modulators) and proposed (using DD-MZM) methods with/without frequency-doubled signals.
3：List of Experimental Equipment and Materials:
External cavity laser, two phase modulators (PM), dual drive Mach Zehnder modulator (DD-MZM), RF power source.
4：Experimental Procedures and Operational Workflow:
The light source is chirped by two cascaded phase modulators, then shaped into a super-Gaussian narrow pulse by the DD-MZM. The spectral shapes at different pulse widths are demonstrated.
5：Data Analysis Methods:
The OFC spectrum obtained with a DD-MZM and two phase modulators is analyzed for flatness and number of comb lines.
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