We present a modified method to design photonic crystal fibers (PCFs) with flattened dispersion char- acteristic. Using this modified PCF we design a broadband fiber optical parametric amplifier (FOPA), which provides...We present a modified method to design photonic crystal fibers (PCFs) with flattened dispersion char- acteristic. Using this modified PCF we design a broadband fiber optical parametric amplifier (FOPA), which provides a gain of 8 dB with 1.5-dB uniformity over a 260-nm bandwidth. Both the simulation results of total dispersion of PCF and the gain spectrum of FOPA are demonstrated.展开更多
A low cost 8×10-Gb/s transmission system over 1500 km on conventional fiber using chirped fiber Bragg grating （CFBG） as dispersion compensator is demonstrated. The bit error rate （BER） below 10^-10 at 1500 km...A low cost 8×10-Gb/s transmission system over 1500 km on conventional fiber using chirped fiber Bragg grating （CFBG） as dispersion compensator is demonstrated. The bit error rate （BER） below 10^-10 at 1500 km is obtained. The channel spacing is 0.8 nm and the optical amplifier spacing is 100 km. Only 16 erbium-doped fiber amplifiers （EDFAs） are used.展开更多
A multi-wavelength erbium-doped fiber laser （MEDFL） with simple line structure is experimentally demonstrated by using a Sagnac interferometer as a comb filter. It is shown that the multi-wavelength lasing is quite ...A multi-wavelength erbium-doped fiber laser （MEDFL） with simple line structure is experimentally demonstrated by using a Sagnac interferometer as a comb filter. It is shown that the multi-wavelength lasing is quite stable at room temperature due to the four-wave mixing （FWM） effect among different laser channels in the dispersion-shifted fiber cooperated in the laser cavity.展开更多
We study an electronic compensator （EC） as a receiver for a 100-Gb/s polarization division multiplexing coherent optical orthogonal frequency division multiplexing （PDM-CO-OFDM） system without optical dispersion c...We study an electronic compensator （EC） as a receiver for a 100-Gb/s polarization division multiplexing coherent optical orthogonal frequency division multiplexing （PDM-CO-OFDM） system without optical dispersion compensation.EC,including electrical dispersion compensation （EDC）,least squares channel estimation and compensation （LSCEC）,and phase compensation （PC）,is used to compensate for chromatic dispersion （CD）,phase noise,polarization mode dispersion （PMD）,and channel impairments,respectively.Simulations show that EC is highly effective in compensating for those impairments and that the performance is close to the theoretical limitation of optical signal-to-noise rate （OSNR）,CD,and PMD.Its robustness against those transmission impairments and fiber nonlinearity are also systematically studied.展开更多
针对双聚焦系统中的电分析器,利用CST Studio Suite进行了结构设计与电磁场仿真。主要工作包括理论计算、柱面结构电分析器设计、弥散电场优化与屏蔽、电-磁分析系统电磁场及粒子运动轨迹模拟。研究结果表明:接地极与绝缘垫片的安装能...针对双聚焦系统中的电分析器,利用CST Studio Suite进行了结构设计与电磁场仿真。主要工作包括理论计算、柱面结构电分析器设计、弥散电场优化与屏蔽、电-磁分析系统电磁场及粒子运动轨迹模拟。研究结果表明:接地极与绝缘垫片的安装能有效降低弥散场对粒子运动状态影响;束流聚焦点与理论计算相对偏差小于1%;在紧凑、易安装结构下,在电、磁分析系统束流引出口分别实现能量聚焦及速度聚焦,且放大系数小于1。展开更多
基金This work was supported by the National Natural Sci- ence Foundation of China under Grant No. 60377023.
文摘We present a modified method to design photonic crystal fibers (PCFs) with flattened dispersion char- acteristic. Using this modified PCF we design a broadband fiber optical parametric amplifier (FOPA), which provides a gain of 8 dB with 1.5-dB uniformity over a 260-nm bandwidth. Both the simulation results of total dispersion of PCF and the gain spectrum of FOPA are demonstrated.
基金This work was supported by the "863" High-Technology Research and Development Program ofChina under Grant No. 2001AA120201
文摘A low cost 8×10-Gb/s transmission system over 1500 km on conventional fiber using chirped fiber Bragg grating （CFBG） as dispersion compensator is demonstrated. The bit error rate （BER） below 10^-10 at 1500 km is obtained. The channel spacing is 0.8 nm and the optical amplifier spacing is 100 km. Only 16 erbium-doped fiber amplifiers （EDFAs） are used.
基金the Science and Technology Department of Zhejiang Province(No.R104154 and 2004C31095)Science and Technology Bureau of Hangzhou Municipal Government(No.20051321B14).
文摘A multi-wavelength erbium-doped fiber laser （MEDFL） with simple line structure is experimentally demonstrated by using a Sagnac interferometer as a comb filter. It is shown that the multi-wavelength lasing is quite stable at room temperature due to the four-wave mixing （FWM） effect among different laser channels in the dispersion-shifted fiber cooperated in the laser cavity.
基金supported in part by the National Natural Science Foundation of China (No.60932004)the National "863" Program of China (Nos.2009AA01Z256, 2009AA01Z253, and 2009AA01A345)the National "973" Program of China (No.2007CB310705)
文摘We study an electronic compensator （EC） as a receiver for a 100-Gb/s polarization division multiplexing coherent optical orthogonal frequency division multiplexing （PDM-CO-OFDM） system without optical dispersion compensation.EC,including electrical dispersion compensation （EDC）,least squares channel estimation and compensation （LSCEC）,and phase compensation （PC）,is used to compensate for chromatic dispersion （CD）,phase noise,polarization mode dispersion （PMD）,and channel impairments,respectively.Simulations show that EC is highly effective in compensating for those impairments and that the performance is close to the theoretical limitation of optical signal-to-noise rate （OSNR）,CD,and PMD.Its robustness against those transmission impairments and fiber nonlinearity are also systematically studied.
文摘针对双聚焦系统中的电分析器,利用CST Studio Suite进行了结构设计与电磁场仿真。主要工作包括理论计算、柱面结构电分析器设计、弥散电场优化与屏蔽、电-磁分析系统电磁场及粒子运动轨迹模拟。研究结果表明:接地极与绝缘垫片的安装能有效降低弥散场对粒子运动状态影响;束流聚焦点与理论计算相对偏差小于1%;在紧凑、易安装结构下,在电、磁分析系统束流引出口分别实现能量聚焦及速度聚焦,且放大系数小于1。
