1：Experimental Design and Method Selection:

The dual-wavelength generated from a laser source are modulated by a phase modulator (PM) with a broadcast signal. Then, the central carriers and side-bands are separated by using a polarization beam splitter (PBS) and modulated with unicast data using Mach-Zender modulator (MZM). After combining side-bands (broadcast data) and central carriers (unicast data) using PBS, the hybrid data are transmitted through 25 km single mode fiber (SMF) to the remote node (RN).

2：Sample Selection and Data Sources:

Two tunable lasers emitted at 1550.23 nm and 1551.03 nm are used as the dual-wavelength laser sources.

3：23 nm and 03 nm are used as the dual-wavelength laser sources. List of Experimental Equipment and Materials:

3. List of Experimental Equipment and Materials: Phase modulator (PM), polarization beam splitter (PBS), Mach-Zender modulator (MZM), single mode fiber (SMF), polarization controller (PC), erbium-doped fiber amplifier (EDFA), arraying-waveguide grating (AWG), photodiode (PD), low-pass filter (LPF), bit error rate tester (BERT).

4：Experimental Procedures and Operational Workflow:

The dual-wavelength are driven by a 5 GHz RF signal and modulated by a 622 Mbps broadcast on-off keying signal using PM. The central carriers and the first-order side-bands are separated and then routed into two different output-port of PBS1. The first-order side-bands with a broadcast signal are fed into x-axis input-port of PBS2. Meanwhile, the central carriers output from y-axis of PBS1 are modulated by 622 Mbps unicast signals using a Mach-Zehnder modulator. The combined signals are transmitted through 25 km SMF to the remote node.

5：The first-order side-bands with a broadcast signal are fed into x-axis input-port of PBSMeanwhile, the central carriers output from y-axis of PBS1 are modulated by 622 Mbps unicast signals using a Mach-Zehnder modulator. The combined signals are transmitted through 25 km SMF to the remote node. Data Analysis Methods:

5. Data Analysis Methods: The bit error rate curves and eye diagrams of both unicast and broadcast signals are measured to evaluate the performance of the proposed system.