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本文提出了一种基于少模光纤布拉格光栅(Few-mode FBG)的模分复用通信系统,阐述了基于少模光纤布拉格光栅的模分复用/解复用原理,建立了2×2的模分复用实验系统,分别利用LP01和LP11模作为独立信道,实现了1.25 Gbps和622Mbps两路伪随机序列(PRBS)的10km传输实验,给出了传输后的眼图,分析了当激光器波长为1549.228nm时,实验系统的误码特性.实验验证了基于少模光纤布拉格光栅的模分复用通信系统的可行性,为进一步实现长距离高速率的模分复用通信奠定了实验基础. 相似文献
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一种基于光子晶体少模光纤模分复用系统的设计与分析 总被引:1,自引:1,他引:0
对模分复用(MDM) 系统中传输容量和模式串 扰问题进行了研究,在VPItransmissionMaker仿真平台设计并构建了一种新型6×6多输 入多输出(MIMO)MDM系统。本文系统 使用高模式差分群时延(MDGD)光子晶体少模光纤(PC-FM F),实现包括(LP01、LP11a 、LP11b、LP21a、LP 21b、LP02)在内六模式相对独立的传输, 结合恒模算法(CMA)对输出信号解复用。仿真实验结果表明,在 系统的光信噪比(OSNR)为22dB时,每 个模式携带传输速率为40Gbit/s的4QAM调制信号,实现了在PC-FMF 中稳定传输34km,保证了每个模式信号的误码 率(BER)均在10-5量级以下 ,满足通信系统传输 最低要求。与传统FMF的MDM系统相比,本文设计的基于PC-FMF的MDM系统 可有效消除模式间串扰,提高MDM系统的容量,在高速大容量光传输系统中具有重要价值。 相似文献
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提出了一种大有效模面积的折射率渐变型分布模式 信道的新型6模式复用器,采用光束传播法和全矢 量有限元方法研究了模分复用器的性能指标。结果表明,本文复用器实现了折射率渐变型分 布、大有效模场 面积、低非线性系数、高耦合效率和宽工作波段6模式复用解复用操作;在1450650n m工作波段, 模分复用器耦合效率优于-0.449dB,模式LP01 、LP 11a、LP11b、LP21a 和LP21b耦合效率分别优于0、 -0.018、-0.018、-0.449和-0.036dB, 呈现出平坦特性;在C波段内,模分复用器耦合效率 呈现出更好的平坦特性,所有模式对应的平坦度均优于0.066dB;在 1550nm,所有模式的有效面积均大于标准单模光纤(SMF)的14.9倍,非线性系数均远小于标准SMF。 相似文献
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介绍了一种使用模式兼容的OADM(光分插复用器)的双LP11模相干OFDM(正交频分复用)信号传输方法。该OADM采用薄膜滤波器和双反射机制实现模式复用的光信号的插分功能。实验结果表明,对于3×318Gbit/s的OFDM信号,OADM在插、分与直通端口的功率代价分别为2.6、2.4和0.7dB。 相似文献
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提出一种少模掺铒光纤放大器(FM-EDFA)仿真方法,通过引入泵浦相关的等效掺铒浓度参数来拟合双向泵浦实验数据,并用VPI软件高效仿真FM-EDFA的级联传输性能。采用光隔离波分复用器(IWDM)开展了LP01和LP11两模双向泵浦放大实验,验证了上述仿真方法的可行性。通过优化前后向泵浦功率的比例,设计了一款模式增益约为11 dB的均衡FM-EDFA;仿真结果表明,该FM-EDFA循环传输10次后的差模增益和光信噪比分别为0.56 dB和27 dB,大于32 GBaud DP-32QAM模分复用信号传输系统纠后无误码所要求的光信噪比阈值。 相似文献
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提出了一种基于三芯光纤的模式复用器/解复用器,三个纤芯包括两个相同的单模纤芯和一个少模纤芯,在少模纤芯中写入长周期光纤光栅以实现单模纤芯中LP01模与少模纤芯中LP11模间的转换。同时从两个单模纤芯输入LP01模,能激发少模纤芯中两个简并的LP11,a模和LP11,b模。采用光束传播法分析了该模式复用器/解复用器的耦合特性及串扰。数值模拟结果显示,若以少模纤芯中LP11模输出能量大于-1dB的波长范围作为该模式复用器/解复用器的工作带宽,则能够达到23nm,并且少模纤芯中生成的其他模式的输出能量皆比LP11模的输出能量小-21dB以上。该模式复用器/解复用器能够实现对少模光纤的模式复用与解复用,并具有极低的串扰。 相似文献
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为了解决通信容量不足以及非线性损伤问题,基于正交相位(IQ)调制外差相干探测,利用极化复用技术、模分复用技术以及先进的数字处理算法,搭建了单通道模分复用少模光纤传输系统,并成功实现了波特率为32 Gbaud的16正交振幅调制(QAM)信号在两个兼并模LP11a和LP11b模式下的1000 km传输。使用时域和频域多输入多输出最小均方(MIMO-LMS)算法进行均衡处理后,误码率(BER)低于软判决前向纠错(SD-FEC)的阈值(5.2×10-2)。 相似文献
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A fully integrated radio transceiver chip for the 2.4- and 5-GHz WLAN standards 802.11a/b/g is presented in a 0.25-/spl mu/m 40-GHz BiCMOS technology. The chip integrates the low-noise amplifiers, mixers, channel filters, programmable gain control, synthesizers with voltage-controlled oscillators and reference oscillator, transmitters, antialiasing filters, and voltage regulators. The key performances of the presented transceiver are a receive sensitivity of -85 dBm and -74 dBm for 11-Mb/s complementary code keying (CCK) and 54 Mb/s orthogonal frequency division multiplexing (OFDM) modes, respectively, and an error vector magnitude of -35 dB measured at the transmitter with an output power of -4 dBm at 54-Mb/s 802.11a mode. The transceiver exceeds all IEEE requirements for the 802.11a/b/g CCK and OFDM standards and supports a frequency range of 4.9 to 6 GHz for the future extensions of the 802.11a standard in different countries. 相似文献
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Aadil Raza Salman Ghafoor Muhammad Fasih Uddin Butt 《Photonic Network Communications》2018,35(2):265-273
Design of a low-cost fiber–wireless communication architecture is desirable by network operators. Therefore, we demonstrate the transmission of \(2 \times 2\) MIMO spatial streams, each having 2 Gbps DPSK signal to two different radio access units (RAUs) in a distributed antenna system architecture. The proposed architecture employs mode group division multiplexing in combination with wavelength division multiplexing to transport RF DPSK signals centered at 10 GHz. The RF signals are used to modulate optical carriers that are centered at 1300 nm and transmitted toward the RAUs over perfluorinated graded-index plastic optical fiber. Heterodyne detection is performed at the RAUs to transmit mm-wave signals at 60 GHz to the end users. Furthermore, wireline access is also achieved at each RAU to support simplex services. A cost-efficient multiple wavelength source is generated from a single laser by employing a dual-drive Mach–Zehnder modulator. An increase in multiplexing gain is achieved using the two LP modes, LP01 and LP11, of each generated wavelength. The proposed architecture gives acceptable BER results for practical implementation. 相似文献
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Spatial mode-division multiplexing is emerging as a potential solution to further increasing optical fiber capacity and spectral efficiency. We report a dual-mode, dual-polarization transmission method based on mode-selective excitation and detection over a two-mode fiber. In particular, we present 107 Gbit/s coherent optical OFDM (CO-OFDM) transmission over a 4.5 km two-mode fiber using LP01 and LP11 modes in which mode separation is performed optically. 相似文献
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短距离光纤传输系统的容量扩展受到越来越广泛的关注。空分复用光传输技术提供了纤芯和模式两个新维度,可以大大提升单根光纤的传输容量。然而空间信道间的串扰严重限制了空分复用技术的实用化。首先研究了弱耦合空分复用光纤,通过在纤芯引入环形折射率微扰的方法实现了模式之间的有效分离;其次,提出了一种可以处理非圆对称简并模式的全光纤复用/解复用器件以及低插损、低串扰扇入扇出器;在此基础上,使用低成本商用强度调制直接检测光模块,实现了短距离弱耦合模分复用及多芯少模复用实时光传输;最后对空分复用实时光传输技术进行了展望。 相似文献
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A simple channel estimation (CE) scheme, which is pilot-aided with just a little number of pilots inserted in the first half part of the subcarriers, is proposed and simulated for resisting the fiber dispersion in optical orthogonal frequency division multiplexing (OFDM) systems. The simulation results verify that the receiver sensitivity is improved by 2-3 dBm for bit error rate (BER) of 10-3 with the proposed CE algorithm than that with other kinds of CE algorithms based on linear square principle. The good constellation performance for a 40 Gbit/s transmission system can be also obtained by the proposed scheme. 相似文献
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为有效缓解D-RoF系统高数字比特速率的不利影响,本文研究了偏振复用的D-RoF系 统,能有效 提高系统单波长的传输容量。分别在传统Stokes矢量检测和简化Stokes矢量检测下,采用一 路偏振态向量 追踪(OTV)与两路偏振态向量追踪(TTV)的DSP算法能够有效实现偏振解复用。仿真结果表明 ,两路偏振 态向量追踪方法能有效降低正交偏振复用D-RoF系统的功率预算,达到系统最终误码率时, TTV算法需要 的光功率要比OTV算法需要的光功率少2dBm。同时,可用TTV方法实现两路信号最小偏振复 用度为76° 的非正交偏振解复用,丰富了偏振复用的维度。该偏振复用D-RoF系统对其在未来5G无线传 输和有线数字电视传输具有重要意义。 相似文献
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This paper describes the performance of a 560 Mb/s digital fibre-optic link designed specifically for possible use in a broadband integrated services digital network (BISDN) environment. Four 140 Mb/s non-return-to-zero (NRZ) channels are time division multiplexed using a bit-by-bit multiplexing strategy and transmitted using potentially low cost 1.3 μm EE-LED and laser sources. A 10?9 bit error rate with a power level of -34 dBm was achieved for each independent channel over a distance of 10 km. 相似文献