A unidirectional room temperature multi-wavelength fiber ring laser without isolator

A simplified ring cavity for achieving a unidirectional room temperature multi-wavelength erbium-doped fiber ring laser without optical isolator is demonstrated. The fiber ring cavity is built in such a way that the optical fields propagating in two directions suffer different losses caused by one sampled fiber Bragg grating. Furthermore, simultaneous multi-wavelength lasing with 0.8-nm intervals is demonstrated with sinusoidal phase modulation just before the sampled fiber Bragg grating to prevent single-wavelength lasing and unstable wavelength oscillation.     

基于光纤光栅的光子器件及其在波分复用系统中的应用

本文报道了光纤光栅外腔激光器、光纤光栅解复用器、光纤光栅滤波器、解复用滤波器和分/插复用器(OADM)等在全光通信网中有应用潜力的新型光子学器件的实验结果,并演示了这些器件的功能和基于这些器件的4路符合ITU波长标准,间隔约为1.6nm,速率为4×155Mbit/s的密集波分复用传输。     

一种新型可配置全光分插复用器的设计

本文提出了一种新型的基于光纤光栅和光纤环形镜的可动态配置的全光分/插复用器,并对这种结构实现单信道、多信道或有选择性地对奇次信道或偶次信道进行下路或直通配置进行了模拟和分析,说明了这种结构的可行性.     

High-power electro-optic switch technology based on novel transparent ceramic

A novel high-power polarization-independent electro-optic switch technology based on a reciprocal structure Sagnac interferometer and a transparent quadratic electro-optic ceramic is proposed and analyzed theoretically and experimentally.The electro-optic ceramic is used as a phase retarder for the clockwise and counter-clockwise polarized light, and their polarization directions are adjusted to their orthogonal positions by using two half-wave plates. The output light then becomes polarization-independent with respect to the polarization direction of the input light. The switch characteristics, including splitter ratios and polarization states, are theoretically analyzed and simulated in detail by the matrix multiplication method.An experimental setup is built to verify the analysis and experimental results. A new component ceramic is used and a nonpolarizing cube beam splitter(NPBS) replaces the beam splitter(BS) to lower the ON/OFF voltage to 305 V and improve the extinction ratio by 2 d B. Finally, the laser-induced damage threshold for the proposed switch is measured and discussed.It is believed that potential applications of this novel polarization-independent electro-optic switch technology will be wide,especially for ultrafast high-power laser systems.