Design and optimization of evanescently coupled waveguide photodiodes

We present the design and optimization of evanescently coupled waveguide photodiodes(EC-WPDs) based on the coupling modes theory and the beam propagation method.Efficient focalization of the optical power in the absorber is achieved by an appropriate choice of index matching layers of EC-WPDs.Numerical simulation shows that high-speed(40 GHz),high quantum efficiency(81%) and high linearity photodiodes can be achieved, and EC-WPDs are promising devices for future optical communication systems.     

Selected area growth integrated wavelength converter based on PD-EAM optical logic gate

A selected area growth wavelength converter based on a PD-EAM optical logic gate for WDM application is presented, integrating an EML transmitter and a SOA-PD receiver. The design, fabrication, and DC characters were analyzed. A 2 Gb/s NRZ signal based on the C-band wavelength converted to 1555 nm with the highest extinction ratio of 7 dB was achieved and wavelength converted eye diagrams with eyes opened were presented.     

平面光波导自动耦合控制系统的实现及测试

开发了新的自动对接方法,设计了基于阈值的折返遍历搜索算法(RTS)与二分数据截断(BTDT)搜索算法,实现了六自由度耦合平台的四自由度的自动对接。折返遍历搜索算法精度高,可设定不同步长实现不同精度要求;二分数据截断算法搜索速度快,可快速接近最高点。实验结果表明,波导器件的纤到纤损耗可在8 min内调节至8~9 dB(包括波导传输损耗,人工对准需在半小时以上才可达到8~9 dB),耦合系统稳定性可保持15~20 min。与自动测试系统配合使用,在8 min内即可进行2 200点的波长扫描与功率扫描,自动耦合系统具有实用性、稳定性和良好效果。     

Design and optimization of evanescently coupled waveguide photodiodes

We present the design and optimization of evanescently coupled waveguide photodiodes (EC-WPDs) based on the coupling modes theory and the beam propagation method. Efficient focalization of the optical power in the absorber is achieved by an appropriate choice of index matching layers of EC-WPDs. Numerical simulation shows that high-speed (40 GHz), high quantum efficiency (81%) and high linearity photodiodes can be achieved, and EC-WPDs are promising devices for future optical communication systems.