研究目的
To establish the validity of small-signal approximations for lasers and fibers for use within Passive Optical Networks (PONs) and to identify the conditions under which large-signal models are necessary.
研究成果
The small-signal approximations for lasers and fibers are valid for PON systems with small extinction ratios and short transmission distances. For larger extinction ratios and longer distances, full numerical approaches for both the laser and optical fiber are necessary to accurately predict system performance.
研究不足
The small-signal models are valid only for modulation extinction ratios < 4 dB and transmission distances < 25 km. For larger extinction ratios and longer distances, large-signal models are required due to increased adiabatic chirp.
1：Experimental Design and Method Selection:
The study uses numerical simulations with justifying experimental results to validate the small-signal laser and fiber system for PON systems. It compares small-signal and large-signal approaches under varying modulation extinction ratios and transmission distances.
2：Sample Selection and Data Sources:
The study focuses on directly modulated semiconductor lasers in PON systems, with data generated from simulations and experimental setups.
3：List of Experimental Equipment and Materials:
The study involves semiconductor lasers, optical fiber with chromatic dispersion, and an ideal photodetector.
4：Experimental Procedures and Operational Workflow:
The study involves generating a 10 Gbit/s on-off keying modulation using non-return to zero (NRZ) line coding, scaling the modulation current to operate in small-signal and large-signal regimes, and analyzing the system's performance.
5：Data Analysis Methods:
The study uses a quality metric of the percentage deviance to quantify the difference between the expected intensity value with those that would have been obtained via the small-signal approach.
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