研究目的
Investigating phase noise induced in a piece of optical fiber installed in an ultra-stable environment to improve the frequency stability of a fiber-based optical frequency comb (OFC).
研究成果
The ultra-stable environment significantly reduced the fiber noise, improving the Allan deviation by more than three orders of magnitude compared to the laboratory environment. This provides valuable knowledge for enhancing the optical frequency stability of OFCs and optical fiber links.
研究不足
The achievable gas pressure in the chamber is limited due to chamber imperfection, and the system's performance might be affected by external factors not fully isolated.
1：Experimental Design and Method Selection:
Employed a fiber type Mach-Zehnder heterodyne interferometer with a fiber under test (FUT) and an acousto-optic modulator (AOM) for heterodyne detection.
2：Sample Selection and Data Sources:
Used a 10-m optical fiber as FUT.
3：List of Experimental Equipment and Materials:
Ultra-stable laser, AOM, photodetectors (PD1 and PD2), aluminum chamber for ultra-stable environment, turbo-molecular pump, passive vibration isolation table, acoustic enclosure.
4：Experimental Procedures and Operational Workflow:
Implemented environmental isolation techniques (hermetically sealing, vacuuming, temperature stabilization, vibration isolation, acoustic shielding) and measured phase noise under different environmental conditions.
5：Data Analysis Methods:
Calculated Allan deviations from propagation delay fluctuations to evaluate fiber noise.
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