研究目的
Investigating the performance of a novel tunable, stable, and low-noise Brillouin ring laser layout for applications in fiber sensing and other fields requiring highly coherent and stable tunable sources.
研究成果
The doubly resonant short-cavity layout and active wavelength locking technique significantly reduce phase noise and intensity fluctuations compared to the long cavity version, providing spectral linewidths of approximately 10 kHz and RIN values of at most ~ -140 dB/Hz. The wavelength locking system can effectively tune the frequency shift between the pump and BRL over a range of over 200 MHz with sub-kHz precision, making it a promising solution for applications requiring highly coherent and stabilized tunable sources.
研究不足
The study focuses on a specific configuration of a Brillouin ring laser and may not be directly applicable to other configurations or materials. The performance improvements are compared to a previous long-cavity version, and further optimization may be required for different applications.
1：Experimental Design and Method Selection:
The study employs a doubly-resonant short-cavity Brillouin ring laser (DR-SC) paired with an active wavelength stabilization setup. Theoretical models and algorithms are used to analyze the performance.
2：Sample Selection and Data Sources:
The experiment uses a short (< 10 m long) loop-shaped single mode fiber closed by an 90/10 optical coupler. A DFB laser at a wavelength of 1550 nm provides the seed pump radiation signal.
3：List of Experimental Equipment and Materials:
Equipment includes a DFB laser, optical coupler, polarization controllers, optical circulator, fast photodetector, and Mach-Zender electro-optical modulator.
4：Experimental Procedures and Operational Workflow:
The pump light generates and amplifies a downshifted, counter-propagating Stokes radiation through Stimulated Brillouin Scattering (SBS). The Stokes radiation exits the ring through the coupler and is extracted through the optical circulator.
5：Data Analysis Methods:
The spectral linewidth, relative intensity noise (RIN), and temporal stability of the signal are measured using optical delayed self-heterodyne technique and electrical spectrum analyzer.
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