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Transmission capacity for optical undersea cable systems is growing remarkably and a more than 500-fold increase has been achieved for commercial systems over the past 10 years. The first optical fiber cable in the Pacific Ocean went into service in 1989 and has a capacity of 280 Mbit/s per fiber pair. The emergence of an Erbium-doped fiber amplifier paved the way for a drastic capacity increase for these cables, and large capacity optical amplifier undersea cable systems with 5 Gbit/s per fiber pair were constructed worldwide in 1995-1996. Recent 10 Gbit/s-based wavelength division multiplexing (WDM) technologies together with new fibers and new amplifiers have allowed a further increase in capacity up to 160 Gbit/s, and these WDM systems will begin commercial service in both the Pacific Ocean and the Atlantic Ocean in 2000. Research interest is now being directed towards the development of undersea cable systems with a transmission capacity of 1 Tera-bit/s or more. This paper reviews the key technologies for next generation 160 Gbit/s optical undersea cable systems and recent progress towards Tera-bit/s systems. Dispersion managed soliton transmission for future higher bit rate WDM is also discussed. 相似文献
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An approach to convert NRZ signal to Manchester code at 20 Gbit/s based on nonlinear optical fiber loop mirror (NOLM) is demonstrated. Using 20 Gbit/s NRZ data and optical clock as external pumps of the NOLM, the conversion of NRZ to Manchester code is successfully realized. The eye diagrams, waveforms and optical spectra are presented. We investigated the extinction ratio (ER) penalty (5 dB) to evaluate the system performance and analyzed the method to improve it. The proposed scheme is potential for applications in future networks. 相似文献
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For the first time to our knowledge, we demonstrate simultaneous demodulation and slow-light delay of differential phase-shift keying (DPSK) signals at flexible bit rates using the stimulated-Brillouin-scattering-based optical filtering effect in optical fiber. Both 10 and 2.5 Gbit/s DPSK signals have been demodulated and delayed with excellent performances. In the case of the 10 Gbit/s DPSK signal, after demodulation the tunable delay range with error-free operation is about 50 ps, which we believe is the best result obtained for 10 Gbit/s slow-light demonstrations. For the 2.5 Gbit/s DPSK signal, the optimal sensitivity after demodulation is -36.5 dBm, which is comparable with the back-to-back sensitivity of a 2.5 Gbit/s nonreturn-to-zero signal. 相似文献
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Jansen SL Khoe GD de Waardt H Spälter S Weiske CJ Schöpflin A Field SJ Escobar HE Sher MH 《Optics letters》2004,29(20):2348-2350
A polarization-diverse subsystem based on periodically poled lithium niobate waveguides is used as an optical phase conjugator for compensation for linear and nonlinear distortion. We show successful transmission formats of 13 x 40 Gbit/s non-return-to-zero mixed with 6 x 10 Gbit/s non-return-to-zero and 40-Gbit/s duobinary over 8 x 100 km of standard single-mode fiber. A single phase conjugator is used to conjugate all data formats, including the alternative duobinary format, simultaneously. 相似文献
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基于半导体光放大器非线性效应提出一种连续可调谐的色度色散补偿方法.利用SOA的交叉相位调制效应,对10 Gbit/s和 40 Gbit/s RZ码系统的补偿效果和补偿范围进行了仿真分析.分析结果表明,该方法在10 Gbit/s传输系统中,可以实现补偿范围为400 ps/nm的正负色散.在40 Gbit/s传输系统中,可以实现补偿范围为40 ps/nm的正负色散.在理论分析基础上,进行了10 Gbit/s传输系统下连续动态色度色散测补偿实验.实验结果表明,该方法实现了-40~60 ps/nm范围内色度色散的连续可调谐补偿. 相似文献
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Mélissa Ziebell Delphine Marris-Morini Gilles Rasigade Jean-Marc Fédéli Eric Cassan Laurent Vivien 《Optical and Quantum Electronics》2012,44(12-13):581-587
Experimental results of a high-speed silicon optical modulator based on carrier depletion in a pipin diode and Germanium photodetectors are presented. 10 Gbit/s data transmission is obtained for both optoelectronic devices, with for the optical modulator an extinction ratio (ER) higher than 8 dB and insertion loss (IL) lower than 6 dB and for Ge photodetector, a zero-bias operating at 10 Gbit/s. Finally, a 10 Gbit/s optical link combining Si modulator and Ge photodetector is demonstrated. 相似文献
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One meter-long spool of bismuth oxide-based fiber, with nonlinear coefficient of 1250 W−1 km−1, is used to realize an optical 160-to-10 Gbit/s demultiplexer based on four wave mixing. Bit-Error-Rate measurements demonstrate a demultiplexing penalty lower than 2 dB confirming the suitability of bismuth oxide-based fiber for 160 Gbit/s all-optical processing. 相似文献
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A single chip optical receiver with an integrated large-diameter photodiode, transimpedance amplifier, two stages active equalizer, post amplifier and 50 Ω driver is used for gigabit transmission over PMMA step plastic optical fiber (SI-POF). The large-diameter photodiode with an antireflection coating optimized for red light. The integrated equalizer enables the presented optical receiver to reach 1 Gbit/s over 50 m SI-POF at bit error ratio of 10− 6. An error free (< 10− 9) 1 Gbit/s data rate over 40 m standard PMMA step-index plastic optical fiber is also achieved. 相似文献
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A 40 Gbit/s optical 3R regenerator is proposed and demonstrated. The 3R regenerator consists of a dual-ring injection mode-locked fiber ring laser as the clock recovery module and an electroabsorption modulator (EAM) as the decision gate. The clock recovery module extracts the optical short pulse clock with low timing jitter from degraded 40 Gbit/s optical data streams, while the decision gate restores their signal quality. A numerical model describing the cross-absorption modulation effect in a bulk EAM is developed to explore the operating conditions, such as bias voltage, pump signal power. The timing jitter tolerance for the EAM optical gate is also investigated. Significantly improvement of BER is obtained from 40 Gbit/s RZ signals which are degraded by polarization mode dispersion or chromatic dispersion. 相似文献
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In this work we present a numerical code for evaluating the system performances of wavelength division multiplexed (WDM) point-to-point optically amplified links, taking into account the behavior of the erbium amplifier with WDM signals. The code uses a conventional split-step method to evaluate the signal propagation in the optical fiber while the signal at the amplifier output is obtained after having evaluated the gain and amplified spontaneous emission noise contribution by finding the evolution of the excited ion fraction along the doped fiber. As an example, we study a 16 x 2.5 Gbit/s system operating in a link 1000 km long with an amplifier spacing of 100 km. 相似文献
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In this work we present a numerical code for evaluating the system performances of wavelength division multiplexed (WDM) point-to-point optically amplified links, taking into account the behavior of the erbium amplifier with WDM signals. The code uses a conventional split-step method to evaluate the signal propagation in the optical fiber while the signal at the amplifier output is obtained after having evaluated the gain and amplified spontaneous emission noise contribution by finding the evolution of the excited ion fraction along the doped fiber. As an example, we study a 16 x 2.5 Gbit/s system operating in a link 1000 km long with an amplifier spacing of 100 km. 相似文献
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We demonstrated 2.16-Tbit/s (43 Gbit/s x 54 ch) WDM transmission over 600 km of standard single-mode fiber with high spectral efficiency 0.53 bit/s/Hz using optimized optical mux/demux filters for 75-GHz channel spacing in a simple NRZ modulation scheme. 相似文献
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用光反馈半导体激光器产生混沌超宽带(UWB)信号, 搭建了混沌UWB光载无线通信链路, 实现了360, 720 Mbit/s和1.44 Gbit/s三种不同传输速率下混沌UWB脉冲信号的生成和传输. 在未经任何色散补偿处理的情况下, 1.44 Gbit/s的混沌UWB信号在经过10 km单模光纤和0.6 m无线链路传输后, 在天线接收端被成功解调. 由于混沌UWB信号输出的随机性, 对应的UWB信号频谱中未出现任何离散的谱线. 这意味着利用混沌UWB信号实现的光载无线通信链路, 可以完全避免离散谱线对系统传输性能的劣化. 相似文献
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We demonstrate for the first time, to our knowledge, a clock-distribution method for ultra-high-speed optical time-domain multiplexed systems data packets that provides instantaneous synchronization, fast locking/unlocking times, and a highly stable bursty clock, enabling error-free operation of 160 to 10 Gbit/s time demultiplexing with a power penalty of 1.5 dB after 51 km transmission in standard single-mode fiber (ITU G.652). 相似文献
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ABSTRACTBy incorporating double-ring cavities and a piece of un-pumped Er3+-doped fiber (EDF) as a saturable absorber, we report a single-longitude-mode EDF fiber laser at C-band. The single-longitude-mode is obtained, the first time, by inserting only two subring cavities in either serial connection or parallel connection. The fiber laser has an optical signal-to-noise-ratio of 34.5 dB and a maximum power fluctuation of less than 1.3% for 1-hr operation. It was then modulated up to 10 Gbit/s by using an electro-optic modulator for eye diagrams, compared to back-to-back transmission. Such a compact and low-cost fiber laser is potential for high-speed optical communication. 相似文献
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二阶偏振模色散对高速高斯光脉冲在单模光纤中传输的影响 总被引:5,自引:1,他引:4
研究二阶偏振模色散(PMD)对高斯光脉冲在单模光纤中传输产生的影响,给出输出光脉冲的时域表达式。分析表明,输出光脉冲在每个基本偏振态上仍保持高斯形状,但其频率啁啾及脉宽等特性都已改变,文中对这些变化与二阶偏振模色散之间的关系进行了讨论。通过比较10Gb/s和40Gb/s的光传输系统中二阶偏振模色散的影响,可以发现,若规定脉冲展宽不能超过脉宽的十分之一,40Gb/s系统所能容忍的二阶偏振模色散极限值比10Gb/s系统小一个数量级。 相似文献