研究目的
Demonstrating a simple and reconfigurable all-fibered system that generates symmetric optical frequency combs based on a dual-wavelength-pumped fiber ring cavity.
研究成果
The study successfully demonstrates a simple and reconfigurable all-fibered system that generates symmetric optical frequency combs in the 2-μm wavelength region. The system exploits both stimulated Brillouin scattering and cascaded four-wave-mixing, generating more than 20 symmetrical and stable optical frequency comb lines with tunable frequency spacing and center wavelength.
研究不足
The study focuses on the 2-μm wavelength region and the system's performance is evaluated under specific conditions. The benefits and limitations of the hybrid configuration, as well as numerical modelling, are discussed.
1：Experimental Design and Method Selection:
The setup is based on a fiber cavity made of a commercially available 350-m-long highly nonlinear fiber (HNLF) which exhibits anomalous group-velocity dispersion at 2-μm. This bi-chromatic pumping configuration allows the free propagation of the Brillouin Stokes waves, which perform multiple roundtrips in the backward direction and then undergo cascaded FWM, while the two injected optical pumps interact only over a single loop in the forward direction.
2：Sample Selection and Data Sources:
The system generates more than 20 symmetrical and stable optical frequency comb lines.
3：List of Experimental Equipment and Materials:
Continuous wave (CW) laser, polarization controller (PC), fiber coupler (FC), Thulium-doped fiber amplifier (TDFA), optical circulator (OC), fiber under test (FUT), optical spectrum analyzer (OSA).
4：Experimental Procedures and Operational Workflow:
The cascaded FWM process is inefficient for an injected pump power of 23 dBm in the open cavity configuration. In contrast, the closed cavity system can easily generate more than 20 frequency comb lines with the same pump power.
5：Data Analysis Methods:
The dependence of the Brillouin/Kerr output spectrum on the injected optical power is analyzed.
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