1：Experimental Design and Method Selection:

The experiment uses a dual-drive dual-polarization modulator to generate a single sideband RF modulated optical signal and an unmodulated optical signal, with a linear polarizer to suppress third-order intermodulation distortion. The modulators are biased at the quadrature point to avoid second-order distortion.

2：Sample Selection and Data Sources:

A two-tone RF input signal with frequencies around 5 GHz and

3：848 GHz is used, with a separation of 5 MHz to minimize dispersion effects. List of Experimental Equipment and Materials:

Includes a wavelength tunable laser (Keysight N7711A), dual-polarization modulator (Fujitsu FTM7980EDA), polarization controller, in-line polarizer, erbium-doped fiber amplifier (Amonics AEDFA-PA-35), optical filter, standard single-mode fiber (

4：8 km and 23 km lengths), photodetector (Discovery Semiconductors DSC30S), vector network analyzer, and electrical signal analyzer. Experimental Procedures and Operational Workflow:

Light from the laser is launched into the modulator; MZM1 is driven by phase-shifted RF signals to generate SSB modulation, MZM2 is unmodulated; outputs are combined and passed through a polarizer with optimized angle; amplified and filtered optical signal is transmitted through fiber and detected by the photodetector; measurements of transmission response, optical spectrum, and electrical spectrum are taken.

5：Data Analysis Methods:

Output powers at RF signal and intermodulation distortion frequencies are measured to calculate SFDR; simulation using VPItransmissionMaker is compared with experimental results.