1：Experimental Design and Method Selection:

The system consists of a single-loop all-optical microwave oscillator and an embedded active ring resonance cavity (ARRC). The oscillator uses stimulated Brillouin scattering (SBS) for frequency selection and a semiconductor optical amplifier (SOA) for optical envelope detection and feedback modulation. The ARRC acts as a high-Q tunable optical filter to select a single oscillation mode.

2：Sample Selection and Data Sources:

A continuous wave from an external cavity laser (ECL) at 1555 nm is used. A 2 km single-mode fiber (SMF) serves as the gain medium for SBS.

3：List of Experimental Equipment and Materials:

Equipment includes ECL, isolators, polarization controllers, attenuators, SOAs, circulators, erbium-doped fiber amplifiers (EDFAs), optical delay lines (ODLs), tunable optical filters (TOFs), optical spectrum analyzers (OSAs), electrical spectrum analyzers (ESAs), oscilloscopes, and photodetectors (PDs). Materials include SMF and various optical components.

4：Experimental Procedures and Operational Workflow:

The light is split into signal and pump branches. The pump is amplified and injected into the SMF for SBS. The ARRC is inserted into the loop, and its free spectral range (FSR) is measured. Oscillation is established, and spectra are analyzed using OSA and ESA to verify single-mode output and measure phase noise.

5：Data Analysis Methods:

Spectral analysis is performed using OSA and ESA to measure optical and electrical spectra, side-mode suppression ratio (SMSR), phase noise, and tunability. Statistical techniques are not explicitly mentioned, but standard spectral analysis is implied.