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1.
10-Gb/s Operation of RSOA for WDM PON 总被引:1,自引:0,他引:1
《Photonics Technology Letters, IEEE》2008,20(18):1533-1535
2.
为了减少直接检测的光正交频分复用(DD-OOFDM)传输系统中色散对系统的影响,传输系统使用了基于频域的最小均方(LMS)自适应均衡技术,由于基于频域的LMS估计方法计算复杂度低且便于信号块处理,相比最小平方(LS)估计方法,可更有效地追踪信道变化,减小相位噪声对传输系统的影响。实验结果表明,经背靠背(BTB)和100km标准单模光纤(SSMF)传输后,使用频域LMS估计方法的信号比使用频域LS估计方法的信号系统接收功率代价在误码率为10×10-2.5和10×10-2.0时分别降低了2dB及2.5dB,频域LMS估计方法比频域LS估计方法对传输系统具有更好的色散补偿效果。 相似文献
3.
Optical circuits are synthesized for equalizing the group delay dispersion of single-mode fibers. The transfer function of the equalizing circuits are given by Chebyshev polynomials of the second kind. The various realization methods for the group delay equalizer are shown, including periodic structures using birefringent crystals, birefringent fibers, and Mach-Zehnder interferometric planar optical circuits. An optical equalizer employing TiO2 birefringent crystals was fabricated and evaluated by using an optical network analyzer, which operates by making modulation-envelope phase and amplitude measurements while scanning the optical carrier frequency. The measured optical equalizer characteristics show excellent agreement with the simulation analysis. The effectiveness of the equalizer for substantial reduction of the dispersion penalty for a 10 Gb/s signal transmitted over 30 km of normal dispersion fiber was demonstrated. The periodicity of the equalizer results in periodic dispersion-free bands, and hence, the equalizer is suitable for use in future multichannel FDM systems 相似文献
4.
《Solid-State Circuits, IEEE Journal of》2008,43(11):2482-2491
5.
We have proposed a novel multi-band orthogonal frequency division multiplexing and passive optical network (OFDMA-PON) architecture using signal-to-signal beat interference cancellation receivers based on balanced detection at both the optical line terminal and the optical network units (ONUs). Simulation of the full-duplex system with 20 km SSMF transmission and a 1:4 split is achieved successfully. Without a laser source and amplifier at the ONU, our proposed multi-band OFDMA-PON system reduces the signal-to-signal beat interference simply and effectively, while the space of each band can be as small as 1 GHz and optimum carrier-to-signal power ratio at about 10 dB. Simulation results show that the OSNRs of the 40 Gb/s downstream and 30 Gb/s upstream transmission are only 20 and 16 dB required at \(\hbox {BER}=3.8 \times 10^{-3}\), respectively. 相似文献
6.
本文针对低成本下一代无源光网络(NG-PON)传 输系统中带宽限制和光纤累计色散所产生的严重码间串扰问题,提出了一种基于特征向量 构建的改进型支持向量机(SVM)的均衡 算法。该算法充分考虑了码间串扰信号的特性,并在此基础上构建了新颖的特征向量,从而 适用于带限NG-PON系统中。此外,为了实现对PAM-4信号的多分类任务,该算法采用了 多对多(MVM)的方法训练三个独立SVM分类器。本文搭建了基于10-G 带宽光电器件的 50-Gb/sPAM-4信号传输实验来进一步验证本算法的可行性。实验结 果表明,相比于经典 前馈均衡器(FFE)和判决反馈均衡器(DFE),本算法可将接收灵敏度在HD-FEC门限下 (BER=3.8e-3)提高约1dB,从而使系统 在不使用任何放大器的情况下功率预算达到了20 dB。 此外,本方案对CDR定时偏移误差更稳定,可在相当大的偏移范围内保持可观的性能。因 此,该方案可被应用在NG-PON系统中用于更好的提升系统传输性性能。 相似文献
7.
《Photonics Technology Letters, IEEE》2009,21(23):1773-1775
8.
This paper presents a monolithic optical detector, consisting of an integrated photodiode and a preamplifier in a standard 0.18-/spl mu/m CMOS technology. A data rate of 3 Gb/s at BER <10/sup -11/ was achieved for /spl lambda/=850 nm with 25-/spl mu/W peak-peak optical power. This data rate is more than four times than that of current state-of-the-art optical detectors in standard CMOS reported so far. High-speed operation is achieved without reducing circuit responsivity by using an inherently robust analog equalizer that compensates (in gain and phase) for the photodiode roll-off over more than three decades. The presented solution is applicable to various photodiode structures, wavelengths, and CMOS generations. 相似文献
9.
《Solid-State Circuits, IEEE Journal of》2008,43(11):2492-2502
10.
The TAT-12/13 Cable Network will provide a 10 Gb/s capacity between the United States, the United Kingdom, and France. By using ring switching equipment, this capacity is fully restorable within the network without dropping calls in the process. The undersea repeaters in this network use optical amplifier technology to transport a single 5 Gb/s optical signal on each fiber pair. With the upgrade potential already demonstrated, TAT-12/13's transport capacity may at least double before the end of its 25-year design life 相似文献
11.
12.
Optical frequency division multiplexing (OFDM) wireless access network using optical single-sideband modulation is proposed, which allows to deliver different wireless signals from a central station to each base station over an optical fiber network. The optical single-sideband (SSB) OFDM can achieve the highest spectrum efficiency of 0.25 b/s/Hz. A 0.25 b/s/Hz has been experimentally verified by the error-free transport of two-channel 4.98 Gb/s BPSK signal on 10 GHz wireless carrier with the frequency channel interval of 20 GHz at 1550 nm over 50 km-long standard single-mode fiber link. Furthermore, it has been also experimentally confirmed that by introducing the polarization division multiplexing (PDM), the ultimate spectrum efficiency of 0.5 b/s/Hz can be achieved by the hybrid OFDM/PDM 相似文献
13.
T. Lin K.A. Williams R.V. Penty I.H. White M. Glick D. McAuley 《Photonics Technology Letters, IEEE》2006,18(5):691-693
This letter reports successful routing of 10/spl times/10 Gb/s multiwavelength optical packets using single-stage semiconductor optical amplifier switches. Performance under switching is assessed with up to ten wavelengths with particular emphasis being placed on the limit of operation. A 15.2-dB power margin is demonstrated which allows at least eight port connections with a commercially available 0-dBm output 10-Gb/s transmitter and -21-dBm sensitivity receiver. 相似文献
14.
《Lightwave Technology, Journal of》2009,27(19):4221-4227
15.
Nonreturn-to-zero (NRZ)- and return-to-zero (RZ)-transmission formats are investigated for 1.55 μm 40 Gb/s fiber grating dispersion compensated standard fiber transmission. The RZ-format is shown to give a twofold increase in transmission distance compared with the conventional NRZ-format. In addition, a larger power margin is obtained at the expense of a reduced dispersion tolerance. System guidelines are proposed relating the pulse width, equalizer spacing, input power and maximum transmission distance. The results are compared with prior theoretical works at 40 Gb/s using equalizer fiber and optical phase conjugation 相似文献
16.
We report on the first demonstration of all-optical label switching (AOLS) with 160 Gb/s variable length packets and 10 Gb/s optical labels. This result demonstrates the transparency of AOLS techniques from previously demonstrated 2.5 Gb/s to this 160 Gb/s demonstration using a common routing and packet lookup framework. Packet forwarding/conversion, optical label erasure/re-write and signal regeneration at 160 Gb/s is achieved using a WDM Raman enhanced all-optical fiber cross-phase modulation wavelength converter. It is also experimentally shown that this technique enables packet unicast and multicast operation at 160 Gb/s. The packet bit-error-rate is measured for all optical label switched 16 /spl times/ 10 Gb/s channels and error free operation is demonstrated after both label swapping and packet forwarding. 相似文献
17.
Gonzalez N. G. Zibar D. Caballero A. Monroy I. T. 《Photonics Technology Letters, IEEE》2010,22(5):335-337
18.
Binh L.N. Thanh Liem Huynh Pang K.K. Sivahumaran T. 《Lightwave Technology, Journal of》2008,26(12):1586-1595
We propose maximum-likelihood sequence estimator (MLSE) equalizers based on either Viterbi algorithm or template matching temple matching (TM) for the equalization of impairments imposed on the minimum shift keying (MSK) modulation formats in long haul transmission without optical dispersion compensation. The TM-MLSE equalizer is proposed as a simplified alternative for the Viterbi-MLSE equalizer. It is verified that the Viterbi-MLSE equalizer can operate optimally when noise approaches a Gaussian distribution. Simulation results of the performances of the two MLSE equalizers for optical frequency discrimination receiver-based optical MSK systems are described. The transmission performance is evaluated in terms of: (1) the chromatic dispersion (CD) tolerance for both Viterbi-MLSE and TM-MLSE equalizers; (2) transmission distance limits of Viterbi-MLSE equalizers with various number of states; (3)the robustness to fiber polarization mode dispersion (PMD) of Viterbi-MLSE equalizers; and (4) performance improvements for Viterbi-MLSE equalizers when utilizing sampling schemes with two and four samples per bit over the conventional single sample per bit. With a small number of states (64 states), the non-compensating optical link can equivalently reach up to approximately 928 km SSMF for 10 Gb/s transmission or 58 km SSMF for 40 Gb/s. The performance of 16-state Viterbi-MLSE equalizers for optical frequency discrimination receiver (OFDR)-based optical MSK transmission systems for PMD mitigation is also numerically investigated. The performance of Viterbi-MLSE equalizers can be further improved by using the sampling schemes with multiple samples per bit compared to the conventional single sample bit. The equalizer also offers high robustness to fiber PMD impairment. 相似文献
19.
Yang H. Lee S. C. J. Tangdiongga E. Okonkwo C. van den Boom H. P. A. Breyer F. Randel S. Koonen A. M. J. 《Lightwave Technology, Journal of》2010,28(4):352-359
20.
We propose and experimentally demonstrate a 37.3 Gb/s passive optical network using four-band orthogonal-frequency-division-multiplexing (OFDM) channels within 10 GHz bandwidth. Here, the required sampling rate and resolution of digital-to-analog/analog-to-digital (DA/AD) converter are only 5 GS/s and 8 bits to accomplish the 40 Gb/s OFDM downstream rate. Moreover, to reduce the power fading and fiber chromatic dispersion issues, a $-$ 0.7 chirp parameter Mach-Zehnder modulator is used for the four-band OFDM modulation scheme. Downstream negative power penalty of $-$ 0.37 dB can be obtained at the bit error rate of $3.8\times 10^{-3}$ after 20 km standard single mode fiber transmission without dispersion compensation. 相似文献