We report on an eight-channel reconfigurable optical add-drop multiplexer based on cascaded microring resonators with a high tuning power consumption and a compact footprint. Microheaters are fabricated on top of the ...We report on an eight-channel reconfigurable optical add-drop multiplexer based on cascaded microring resonators with a high tuning power consumption and a compact footprint. Microheaters are fabricated on top of the microring resonators and can be modulated using the thermo-optic effect to achieve the reconfigurable functionality of the device. We demonstrate the reconfigurable add-drop multiplexing functionality for channel spacings of 1 O0 GHz and 50 GHz, with the centre wavelengths of the channels aligned to International Telecommunication Union grid specifications. The crosstalk for channel spacings of 100 GHz and 50 GHz are less than -22.5 dB and -15.5 dB, respectively. The average tuning efficiency is about 4.5 mW/nm, and the response speed is about 13.0 kHz.展开更多
Fiber optic Mach Zehnder interferometer(MZI) can be used as wavelength multiplexers and demultiplexers. The △ L and △ directly influence the properties of MZI. To lengthen the △ L can demultiplex much more wavelen...Fiber optic Mach Zehnder interferometer(MZI) can be used as wavelength multiplexers and demultiplexers. The △ L and △ directly influence the properties of MZI. To lengthen the △ L can demultiplex much more wavelengths, but when the △ L is longer, the temperature will influence MZI more seriously. A method to solve this problem is proposed, which enables MZI to work stably. The wavelength distance is 0.8 nm, and the extinction ratio is high.展开更多
We propose an analytical model to evaluate the lightpath blocking performance for a single ROADM node with intra-node add/drop contention,in which the number of lightpaths that can be added/dropped with the same wavel...We propose an analytical model to evaluate the lightpath blocking performance for a single ROADM node with intra-node add/drop contention,in which the number of lightpaths that can be added/dropped with the same wavelength is limited by the add/drop contention factor.Different models of traffic load per nodal degree are considered to validate the effectiveness of the analytical model.The simulation results show that the proposed analytical model is effective in predicting the performance for different values of add/drop contention factor C and for variable offered loads at the node.The add/drop contention factor shows an important impact on the lightpath blocking performance and properly raising the contention factor can significantly improve the lightpath blocking performance.When the add/drop contention factor C exceeds a certain level,the performance of a ROADM with intra-node contention is close to that of a contentionless ROADM.展开更多
针对时栅位移传感器因频率响应慢影响测量速率的问题,提出了一种电阻链移相结合数据处理的方法。利用电阻链对时栅输出信号进行移相处理,采用多路模拟选择器和整形输出电路对移相后的信号分时输出,运用可编程片上系统(SOPC)技术进行数...针对时栅位移传感器因频率响应慢影响测量速率的问题,提出了一种电阻链移相结合数据处理的方法。利用电阻链对时栅输出信号进行移相处理,采用多路模拟选择器和整形输出电路对移相后的信号分时输出,运用可编程片上系统(SOPC)技术进行数据处理和误差补偿。实验结果表明:采用该方法采样频率由原来的400 Hz提高到12.8 k Hz,大幅度提高了现阶段时栅位移传感器的频率响应,使传感器实现了高速实时测量。同时能够有效地降低了随机误差,对极内的误差峰—峰值由1.5″降低为0.8″,测量精度提高了近1倍。展开更多
文摘We report on an eight-channel reconfigurable optical add-drop multiplexer based on cascaded microring resonators with a high tuning power consumption and a compact footprint. Microheaters are fabricated on top of the microring resonators and can be modulated using the thermo-optic effect to achieve the reconfigurable functionality of the device. We demonstrate the reconfigurable add-drop multiplexing functionality for channel spacings of 1 O0 GHz and 50 GHz, with the centre wavelengths of the channels aligned to International Telecommunication Union grid specifications. The crosstalk for channel spacings of 100 GHz and 50 GHz are less than -22.5 dB and -15.5 dB, respectively. The average tuning efficiency is about 4.5 mW/nm, and the response speed is about 13.0 kHz.
文摘Fiber optic Mach Zehnder interferometer(MZI) can be used as wavelength multiplexers and demultiplexers. The △ L and △ directly influence the properties of MZI. To lengthen the △ L can demultiplex much more wavelengths, but when the △ L is longer, the temperature will influence MZI more seriously. A method to solve this problem is proposed, which enables MZI to work stably. The wavelength distance is 0.8 nm, and the extinction ratio is high.
基金jointly supported by the National 863 Plans Project of China (2012AA050801)National Natural Science Foundation of China(NSFC)(61172057,61322109)+1 种基金Natural Science Foundation of Jiangsu Province(BK20130003)Science and Technology Support Plan of Jiangsu Province(BE2014855)
文摘We propose an analytical model to evaluate the lightpath blocking performance for a single ROADM node with intra-node add/drop contention,in which the number of lightpaths that can be added/dropped with the same wavelength is limited by the add/drop contention factor.Different models of traffic load per nodal degree are considered to validate the effectiveness of the analytical model.The simulation results show that the proposed analytical model is effective in predicting the performance for different values of add/drop contention factor C and for variable offered loads at the node.The add/drop contention factor shows an important impact on the lightpath blocking performance and properly raising the contention factor can significantly improve the lightpath blocking performance.When the add/drop contention factor C exceeds a certain level,the performance of a ROADM with intra-node contention is close to that of a contentionless ROADM.
文摘针对时栅位移传感器因频率响应慢影响测量速率的问题,提出了一种电阻链移相结合数据处理的方法。利用电阻链对时栅输出信号进行移相处理,采用多路模拟选择器和整形输出电路对移相后的信号分时输出,运用可编程片上系统(SOPC)技术进行数据处理和误差补偿。实验结果表明:采用该方法采样频率由原来的400 Hz提高到12.8 k Hz,大幅度提高了现阶段时栅位移传感器的频率响应,使传感器实现了高速实时测量。同时能够有效地降低了随机误差,对极内的误差峰—峰值由1.5″降低为0.8″,测量精度提高了近1倍。
