研究目的
Investigating the generation of optical frequency combs with improved flatness, tunable comb spacing, and reduced carrier noise using an optical-injection-seeded scheme promoted by sub-harmonic modulation.
研究成果
The proposed scheme generates optical frequency combs with tunable comb spacing, good flatness, and reduced carrier noise. The use of sub-harmonic modulation improves the number of comb lines and flatness, with potential for further enhancement using higher sub-harmonics.
研究不足
The flatness of the optical frequency comb varies with modulation power and does not consistently improve. The number of comb lines reaches a maximum before declining with further increases in modulation power.
1：Experimental Design and Method Selection:
The experiment involves an optical injection system where a slave laser is driven into a nonlinear period-one oscillation state, assisted by sub-harmonic modulation to generate an optical frequency comb.
2：Sample Selection and Data Sources:
A tunable laser serves as the master laser, and a custom-designed directly modulated Fabry-Perot semiconductor laser acts as the slave laser.
3：List of Experimental Equipment and Materials:
Equipment includes a tunable laser (Santec TSL-510), Erbium-doped fiber amplifier, polarization controller, variable optical attenuator, optical circulator, photodetector, optical spectrum analyzer (YOKOGAWA AW6370c), electrical spectrum analyzer (ROHDE & SCHWARZ), and microwave frequency synthesizer (HP 8648A).
4：Experimental Procedures and Operational Workflow:
The master laser's output is amplified and injected into the slave laser. The slave laser's output is analyzed for optical and electrical spectra. Sub-harmonic modulation is applied to promote the optical frequency comb.
5：Data Analysis Methods:
The optical spectrum analyzer and electrical spectrum analyzer are used to analyze the generated comb's characteristics.
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tunable laser
TSL-510
Santec
Acts as the master laser in the experiment, providing a wide range of wavelength in the C band.
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optical spectrum analyzer
AW6370c
YOKOGAWA
Used to analyze the optical spectrum of the generated comb.
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electrical spectrum analyzer
ROHDE & SCHWARZ
Used to analyze the electrical spectrum of the generated comb.
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microwave frequency synthesizer
8648A
HP
Provides the custom-designed sub-harmonic signals to modulate the slave laser.
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