研究目的
To theoretically analyze and experimentally confirm the characteristics of FM noise and linewidth in semiconductor optical amplifiers without facet mirrors, focusing on the effects of amplified spontaneous emission and intrinsic phase fluctuations.
研究成果
The linewidth of the input signal light remains largely unchanged after amplification in the SOA. FM noise increases with the square of the noise frequency and is primarily driven by intrinsic phase fluctuations rather than electron density variations or ASE. Experimental results confirm the theoretical predictions, highlighting the minimal impact of ASE on signal FM noise.
研究不足
The study may have limitations due to insufficient selection of numerical parameters, as indicated by slight differences between experimental and theoretical results. The model assumes specific conditions for longitudinal modes and may not account for all real-world variations in SOA performance.
1：Experimental Design and Method Selection:
The study combines theoretical modeling based on quantum mechanics and Maxwell's wave equations with experimental measurements using an interferometer setup to verify FM noise and linewidth characteristics.
2：Sample Selection and Data Sources:
A semiconductor optical amplifier (SOA) made of InGaAsP with a quantum well structure is used, with parameters derived from previous studies and private communications.
3：List of Experimental Equipment and Materials:
Includes a DFB laser as the light source, optical attenuator (ATT), photodetector (PD), and the SOA itself. Specific models and brands are not detailed in the paper.
4：Experimental Procedures and Operational Workflow:
The FM noise is measured by inserting the SOA into the setup, adjusting input power with an ATT, and driving the SOA with a current of 100mA. Data is collected and compared to theoretical predictions.
5：Data Analysis Methods:
Theoretical analysis involves solving rate equations and noise expansions, while experimental data is analyzed to confirm frequency dependencies and linewidth stability.
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