北京交通大学光波技术研究所, 全光网络与现代通信网教育部重点实验室, 北京 100044
基于外调制器的光子毫米波生成技术具有频率调谐范围大、结构简单、稳定性强和信号频率纯度高等优点，被认为是实现高频宽带可调毫米波信号产生的有效解决方法。对基于一种双平行马赫曾德尔调制器（DPMZM）的光子倍频毫米波生成技术进行系统的理论分析，给出了实现四倍频、六倍频、八倍频毫米波产生的参数条件，在此基础上提出了一种不需要利用电相移器和光滤波器的四倍频毫米波产生方案，讨论了DPMZM消光比和调制深度对光子倍频毫米波生成的影响。
光纤光学 光子毫米波生成 倍频 双平行马赫曾德尔调制器
1 北京交通大学全光网络与现代通信网教育部重点实验室, 北京 100044
2 北京交通大学光波技术研究所, 北京 100044
提出一种基于线性相位插值(LPI)的增强型载波相位估计(CPE)算法，并对其在112 Gb/s偏振复用16进制正交幅度调制（DP-16QAM）系统中的性能进行了仿真和实验研究。该算法在基于数据块平均的CPE算法基础上，通过对其获得的估计相位噪声进行LPI，实现相位噪声估计准确度的大幅提升。仿真结果显示，基于CPE的增强型CPE算法的相位估计误差的方差比基于数据块平均的算法降低了26%。同时，其线宽容忍度是基于数据块平均算法的2倍。在112 Gb/s DP-16QAM实验系统中对增强型算法进行了测试。实验结果表明，在误码率(BER)为3.8×10-3处，采用增强型算法时所需光信噪比(OSNR)比基于数据块平均算法降低了0.7 dB。仿真与实验结果显示，基于LPI的CPE算法性能与基于窗口扫描算法相当，但增强型算法的硬件复杂度降低了99.2%。
光通信 载波相位估计 相干检测 数字信号处理 正交幅度调制
1 北京交通大学全光网络与现代通信网教育部重点实验室， 北京 100044
2 北京交通大学光波技术研究所， 北京 100044
在160 Gb/s光时分复用(OTDM)系统中，带内四波混频(IFWM)效应是影响系统性能的因素之一。分析了IFWM效应对160 Gb/s光时分复用传输系统性能的影响，对采用强色散管理的方法抑制IFWM效应进行了理论分析和实验验证。传输链路采用大色散斜率的标准单模光纤(SSMF)和色散、色散斜率补偿光纤混合的色散管理方式，能够很好地抑制“1”比特处的脉冲幅度变化和“0”比特处产生的寄生脉冲，提升系统的整体性能。在不需要前向纠错和功率代价小于3.6 dB的条件下，实现了较长时间(时间大于2 h)的无误码(误码率小于10-12)传输。
光通信 时分复用 带内四波混频 强色散管理 无误码传输
全光网络与现代通信网教育部重点实验室 北京交通大学，北京 100044
文章提出一种在光纤光栅自身热膨胀效应产生啁啾的基础上，利用铝片热膨胀系数比较高的特点产生应力来增强光纤光栅啁啾，从而实现了宽带、大范围色散调谐的新型光纤光栅色散补偿器。该色散补偿器能够分别对群速度色散及中心波长独立调谐。实验结果表明，在中心波长为1 551.25 nm处，能够实现＞1.5 nm的色散补偿带宽，-350～-690 ps/nm的群时延色散调谐范围；在色散为-660 ps/nm情况下，能够实现中心波长1 nm的偏移。
光通信 光纤光栅 色散补偿 调谐 宽带 optical communication fiber grating dispersion compensation tuning wideband
Author Affiliations
Abstract
A temperature independent 80-Gb/s 100-km transmission system is demonstrated with the use of spectral phase modulation-based tunable dispersion compensator (TDC). The principle of dispersion compensation based on spectral phase modulation as well as the relationship between spectral phase modulation function and group velocity dispersion (GVD) are theoretically studied. TDC based on spectral phase modulation is implemented. The performance of 80-Gb/s transmission system is experimentally evaluated. The non-linear relationship between temperature and temperature-induced dispersion fluctuations is demonstrated through the asymmetric temperature-induced power penalty without dispersion compensation. With respect to the low temperature area, the temperature-induced dispersion fluctuations are smaller than those in the high temperature area. By using the proposed TDC, temperature independent 80-Gb/s transmission is successfully demonstrated under a temperature range of –20 – 60 C with a power penalty of less than 0.8 dB.
060.4230 Multiplexing 060.2360 Fiber optics links and subsystems 060.2330 Fiber optics communications 060.4510 Optical communications 060.5060 Phase modulation Chinese Optics Letters
2012, 10(2): 020602
Author Affiliations
Abstract
1 Key Lab of All Optical Networks and Advanced Communication Network of EMC, Beijing Jiaotong University, Beijing 100044, China
2 Institute of Lightwave Technology, Beijing Jiaotong University, Beijing 100044, China
A single channel with a 160-Gb/s optical time-division-multiplexing (OTDM) transmission over 100 km is fabricated. With the help of 500-GHz optical sampling oscilloscopes, the fiber length is adjusted to the order of 10 m, which corresponds to the accuracy of 0.4 ps for the dispersion compensation. The dispersion map is optimized for the 100-km transmission link. A completely error-free transmission with the power penalty of 3.6 dB is achieved for 2 h without using forward error correction.
光时分复用 高精度色散补偿 色散管理 060.2330 Fiber optics communications 060.2360 Fiber optics links and subsystems 060.4230 Multiplexing 060.4256 Networks, network optimization 060.2400 Fiber properties Chinese Optics Letters
2010, 8(8): 741
1 Key Laboratory of All-Optical Networks and Advanced Communication Networks, Ministry of Education, Beijing 100044, China
2 Institute of Light Wave Technology, Beijing Jiaotong University, Beijing 100044, China
Frontiers of Optoelectronics
2009, 2(4): 389
1 Key Laboratory of All Optical Network and Advanced Telecommunication Network of EMC, Beijing Jiaotong University, Beijing 100044, China
2 Institute of Lightwave Technology, Beijing Jiaotong University, Beijing 100044, China
Frontiers of Optoelectronics
2009, 2(3): 279
Author Affiliations
Abstract
1 Key Laboratory of All-Optical Networks and Advanced Communication Networks, Ministry of Education, Beijing 100044, China
2 Institute of Lightwave Technology, Beijing Jiaotong University, Beijing 100044, China
A new but simply implemented optical clock recovery scheme for optical time-division multiplexing (OTDM) systems based on stimulated Brillouin scattering (SBS) effect is presented and demonstrated experimentally. According to the unequal-amplitude even-multiplexed OTDM signals, the frame clock is extracted. In addition, the clock with multiple tributary rates is recovered from 160-Gb/s OTDM signal in simulation by utilizing the clock recovery module.
受激布里渊 时钟恢复 光时分复用 060.0060 Fiber optics and optical communications 060.2330 Fiber optics communications 290.0290 Scattering 290.5830 Scattering, Brillouin Chinese Optics Letters
2009, 7(8): 08683
Author Affiliations
Abstract
Key Lab of All Optical Network and Advanced Telecommunication Network of Ministry of Education of China, Institute of Lightwave Technology, Beijing Jiaotong University, Beijing 100044, China
A phase modulator is employed in the scheme of soliton pulse compression with dispersion shifted fiber (DSF). Stimulated Brillouin scattering (SBS) effect, as a negative influence here, can be dramatically suppressed after optical phase modulation. The experimental result shows that the launched power required for high-order soliton pulse compression has been significantly increased by 11 dB under the condition of 100-MHz phase modulation. Accordingly, the experiment of picosecond pulse compression generated from electro-absorption sampling window (EASW) has also been implemented.
受激布里渊 相位调制 脉冲压缩 320.5520 Pulse compression 320.5390 Picosecond phenomena 190.0190 Nonlinear optics 190.5890 Scattering, stimulated Chinese Optics Letters
2009, 7(7): 07656
