研究目的
To propose and verify a novel scheme for generating microwave frequency shift keying (FSK) signals using photonic technologies to overcome the limitations of traditional electrical methods, such as limited operating frequency and small tunability, and to meet the requirements of high-frequency applications.
研究成果
The proposed scheme successfully generates microwave FSK signals with frequencies of 2wf for bit '0' and 4wf for bit '1', demonstrating good immunity to phase shift drift and non-ideal extinction ratios. It offers large frequency tunability and meets high-frequency application requirements, with potential for integration using photonic integrated circuits to enhance stability.
研究不足
The system stability may be affected by optical interference in the parallel arms, and long-term stability could be an issue. Additionally, the scheme relies on simulation and may require further experimental validation in real-world conditions.
1：Experimental Design and Method Selection:
The scheme uses a dual parallel structure with two single-drive Mach-Zehnder modulators (MZMs) and a phase modulator (PM) to generate FSK signals through optical interference controlled by a binary coding signal. The theoretical model involves Jacobi-Anger expansions to derive the output signal.
2：Sample Selection and Data Sources:
A simulation is conducted using OptiSystem software with specific parameters: optical carrier at 193.1 THz, RF signal at 5 GHz, binary coding signal at 1 Gbits/s, and phase shift set to 120 degrees.
3：1 THz, RF signal at 5 GHz, binary coding signal at 1 Gbits/s, and phase shift set to 120 degrees.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Key devices include two single-drive MZMs, a PM, an electrical phase shifter (EPS), a laser diode (LD), a microwave signal generator (MSG), an NRZ pulse generator, and a photodetector (PD).
4：Experimental Procedures and Operational Workflow:
A continuous wave from an LD is split into two arms; the upper arm has MZM-a, and the lower arm has MZM-b and PM in series. RF signals with a phase difference drive the MZMs, and the PM is driven by the binary coding signal. The combined lightwaves are detected by a PD to generate the FSK signal.
5：Data Analysis Methods:
Optical and electrical spectra are observed using signal analyzers, and waveforms are analyzed to verify the generation of 2wf/4wf FSK signals, with attention to sideband suppression and phase shift drift effects.
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