光纤通信系统的内调制实验，实验所用光源是半导体激光器，实验所用电信号是NRZ码。-Optical fiber communication system of modulation in experiment, the experiment is a semiconductor laser, light source used laboratory electricity signal is NRZ code

光纤通信系统中的外调制实验，其中光源为半导体机关器，电信号为NRZ码，调制器为马赫曾德尔调制器。-In optical fiber communication system modulation experiment, in which light organ for the semiconductor device, electrical signals for NRZ code, modulator for Mach mach-zehnder modulator.