Department of Applied Materials and Optoelectronic Engineering, National Chi Nan University, 1 University Road, Puli, Nantou, Taiwan, 545.
Opt Lett. 2011 Jan 15;36(2):151-3. doi: 10.1364/OL.36.000151.
This work presents a small-signal analysis for investigating the transmission performance of optical orthogonal frequency division multiplexing signals with a directly modulated DFB laser (DML). The analysis shows the positive chirp of DMLs can intensify power fading after transmission with positive dispersion and provide power gain instead with negative dispersion. The power of subcarrier-to-subcarrier intermixing interference after square-law direct detection, however, is independent on the sign of dispersion.
本文对采用直接调制分布反馈激光器（DML）的光正交频分复用信号的传输性能进行了小信号分析。分析表明，DML 的正啁啾可以在正色散传输后增强功率衰落，并在负色散下提供功率增益。然而，在平方律直接检测后，副载波间混频干扰的功率与色散的符号无关。
