研究目的
To theoretically compare the performance of optical DMT and PAM with IMDD, considering the interplay of laser linewidth, fiber length, transmission rate, and channel bandwidth, and to identify conditions favoring each modulation format.
研究成果
DMT generally outperforms PAM in longer reaches and with lower laser linewidths, while PAM is better for shorter distances and lower costs. The model provides a tool for selecting the optimal modulation format and wavelength band based on system parameters like bit rate, bandwidth, fiber length, and laser linewidth.
研究不足
The study is theoretical and relies on analytical models; it does not include experimental validation. Assumptions include neglecting fiber nonlinearity, standard DSP without advanced SSBI mitigation, and fixed hardware constraints. Performance may vary with practical implementations and unmodeled factors.
1：Experimental Design and Method Selection:
A semi-analytical model is used to compare SSB-DMT on C-band and PAM on O-band, incorporating effects of chromatic dispersion, laser phase noise, bandwidth limitations, and receiver noise.
2：Sample Selection and Data Sources:
Theoretical analysis based on mathematical models derived from previous works; no experimental data used.
3：List of Experimental Equipment and Materials:
Not applicable as it is a theoretical study; references to hardware (e.g., modulators, lasers) are for context only.
4：Experimental Procedures and Operational Workflow:
Mathematical modeling of signal transmission, SNR calculations using equations for P2A noise, SSBI, ICI, and receiver noise; BER calculations for PAM and DMT under varying parameters.
5：Data Analysis Methods:
Use of Chow's water-filling technique for DMT bit allocation, Gaussian noise approximation for BER, and comparative analysis of performance metrics.
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