共查询到20条相似文献,搜索用时 15 毫秒
1.
Joergensen C. Durhuus T. Braagaard C. Mikkelsen B. Stubkjaer K.E. 《Photonics Technology Letters, IEEE》1993,5(6):657-660
Semiconductor optical amplifiers used for efficient wavelength conversion up to 4 Gb/s are discussed. The rise and fall times as well as extinction ratio are experimentally analyzed. System performance at 4 Gb/s is evaluated showing a penalty of only 1.5 dB for the converted signal for conversion over 17 nm 相似文献
2.
Geraghty D.F. Lee R.B. Verdiell M. Ziari M. Mathur A. Vahala K.J. 《Photonics Technology Letters, IEEE》1998,10(1):69-71
Time-resolved spectral analysis is performed on 10 Gb/s signals wavelength converted by four-wave mixing (FWM) in semiconductor optical amplifiers. A pattern-dependent chirp resulting from parasitic gain modulation by the signal is measured and characterized as a function of the converter's pump-to-probe ratio. This chirp is found to be insignificant for pump-to-probe ratios exceeding 9 dB 相似文献
3.
Unlike broadcast-and-select networks, wavelength-routing networks offer the advantages of wavelength reuse and scalability and are thus suitable for wide-area networks (WANs) We study the effects of topological connectivity and wavelength conversion in circuit-switched all-optical wavelength-routing networks. A blocking analysis of such networks is given. We first propose an analytical framework for accurate analysis of networks with arbitrary topology. We then introduce a model for networks with a variable number of converters and analyze the effect of wavelength converter density on the blocking probability. This framework is applied to three regular network topologies that have varying levels of connectivity: the ring, the mesh-torus, and the hypercube. The results show that either a relatively small number of converters is sufficient for a certain level of performance or that conversion does not offer a significant advantage. The benefits of conversion are largely dependent on the network load, the number of available wavelengths, and the connectivity of the network. Finally, the tradeoff between physical connectivity, wavelength conversion, and the number of available wavelengths is studied through networks with random topologies 相似文献
4.
All-optical wavelength conversion using SOA nonlinearities 总被引:2,自引:0,他引:2
In this article the increasing use of WDM systems in telecommunications networks is highlighted, and the potential role for wavelength conversion in future upgrades of such systems is reviewed. Techniques for achieving wavelength conversion by all-optical means using nonlinearities in semiconductor optical amplifiers are explained, and experimental results obtained at BT Laboratories are used to illustrate the state of the art 相似文献
5.
A 1310 to 1550 nm wavelength converter based on nonlinear polarisation rotation in a single semiconductor optical amplifier is demonstrated. Error-free 1310 to 1550 nm wavelength conversion is shown at 20 Gbit/s. 相似文献
6.
M. Matsuura N. Kishi T. Miki 《Photonics Technology Letters, IEEE》2006,18(8):926-928
A novel broadband wavelength converter by multistage cascaded semiconductor optical amplifier (SOA)-based wavelength converters is proposed. We have demonstrated, for the first time, broadband wavelength conversion in the wavelength range of 1320-1610 nm by using three-stage cascaded SOA-based wavelength converters with each different gain band. 相似文献
7.
Iannone E. Sabella R. De Stefano L. Valeri F. 《Communications, IEEE Transactions on》1996,44(6):716-724
The authors analyze the use of all optical wavelength conversion in the optical layer of a high-capacity transport network and compare different technological solutions. The analysis is based on the evaluation of the transmission performance of a generic signal path through the network. At least two technologies have been discovered allowing the realization of all-optical wavelength converters suitable for use in the considered application, providing high performance. In particular, for networks covering long distances, wavelength conversion based on four-wave-mixing in semiconductor amplifiers seems to be a very interesting solution 相似文献
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基于铌酸锂光波导的全光波长转换 总被引:1,自引:0,他引:1
研究了双脉冲泵浦情况下,在准相位匹配(QPM)的周期性极化反转的铌酸锂光波导(PPLN)中,基于级联二阶非线性效应--和频与差频效应(SFG DFG)的全光波长转换.推导了描述SFG DFG波长转换的理论模型.通过数值模拟,研究了波长转换过程,观察到脉冲传播过程中出现了走离效应与脉冲展宽.研究了器件长度、信号波长、脉宽等参数对波长转换效率的影响. 相似文献
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All-optical 1300-nm to 1550-nm wavelength conversion using cross-phase modulation in a semiconductor optical amplifier 总被引:1,自引:0,他引:1
All-optical 1300-nm to 1550-nm wavelength converters may be important components in lightwave networks which use both the 1300-nm and the 1550-nm low-loss transmission windows of silica optical fiber. We describe a new all-optical 1300-nm to 1550-nm wavelength converter, based on cross-phase modulation in a 1300-nm semiconductor optical amplifier. We demonstrate operation of the wavelength converter at 1.25 Gb/s, and present bit-error rate measurements. The wavelength converter demonstrated here potentially operates at high speed, with low input power and low polarization-sensitivity. 相似文献
12.
Koonath P. Sangin Kim Woon-Jo Cho Gopinath A. 《Quantum Electronics, IEEE Journal of》2002,38(9):1282-1290
Theoretical modeling and fabrication of polarization-insensitive semiconductor optical amplifiers that use a multi-quantum-well structure as the gain media are reported. Polarization insensitivity of gain is achieved through the introduction tensile strain into the quantum wells. Gain calculations, using the k·p method, were performed to obtain the required amount of tensile strain to obtain polarization insensitivity over a wide energy spectrum. Fabricated amplifiers show a polarization-insensitive (<1 dB) spectral width of 10 nm at 1300 nm in the InGaAsP/InP system, 15 nm at 1300 nm in the AlInGaAs/InP system, and 40 nm at 1550 nm in the AlInGaAs/InP system 相似文献
13.
K. Yamada H. Fukuda T. Tsuchizawa T. Watanabe T. Shoji S. Itabashi 《Photonics Technology Letters, IEEE》2006,18(9):1046-1048
We demonstrate efficient wavelength conversion using a four-wave-mixing (FWM) effect in a silicon photonic wire waveguide with spot size converters. Applying a continuously operated 160-mW pump, power density in the waveguide's core was increased up to around 430 MW/cm/sup 2/, and the FWM effect was remarkably enhanced. Internal conversion efficiency obtained in an experiment was -10.6 dB. The efficiency was significantly limited by the free-carrier absorption effect. 相似文献
14.
All-optical wavelength conversion and signal regeneration based on cross-absorption modulation in an InGaAsP quantum well electroabsorption modulator (EAM) is studied at different bit rates. We present theoretical results showing wavelength conversion efficiency in agreement with existing experimental results, and the signal regeneration capability of the device is investigated. In particular, we demonstrate the dependence of the extinction ratio of both the converted signal and the control signal on the device length and on the power level of the control signal. We also show how the sweep-out dynamics influences the results 相似文献
15.
Dense WDM technologies make effective use of the vast fiber bandwidth and offer an added dimension to all-optical networks. Wavelength conversion at key network nodes is emerging as a fundamental functionality that can allow transparent interoperability, contention resolution, wavelength routing, and, in general, better utilization of the network resources under dynamic traffic patterns. We offer an overview of the enabling technologies and extend the treatment to the network application of these converters. Attention is given to semiconductor optical amplifiers and their use in wavelength converters. Converters based on four-wave mixing as well as those based on nonlinear optical loop mirrors are evaluated, paying special attention to signal integrity and architectural as well as performance issues. The use of wavelength converters in wavelength routing networks is explored together with the application of these devices in contention resolution and in the routing wavelength assignment problem. Future directions are outlined at the system as well as network levels 相似文献
16.
Leuthold J. Marom D.M. Cabot S. Jaques J.J. Ryf R. Giles C.R. 《Lightwave Technology, Journal of》2004,22(1):186-192
We introduce a general concept for the design of all-optical wavelength converters with pulse reformatting functionality. The novel wavelength converters are based on a single semiconductor optical amplifier followed by an optical filter. A microelectromechanical system-based realization is shown and simultaneous 40 Gb/s wavelength conversion, switching and signal format conversion is demonstrated. The new pulse reformatting optical filter device outperforms current schemes with respect to input-power requirements, input-power dynamic range and signal quality. 相似文献
17.
We analyze the wavelength-converting operation of directionally coupled semiconductor optical amplifiers (DCSOA's) with respect to their static and dynamic characteristics. A complete dynamic DCSOA model based on the modified time-dependent transfer-matrix method is developed. This model accurately considers longitudinal variations of carrier and photon densities, gain, refractive index, coupling coefficients, and lateral optical fields. The extinction ratio, modulation bandwidth, and frequency chirping of DCSOA-based wavelength converters are investigated. For most characteristics, the DCSOA scheme has advantages over cross-gain modulation. Furthermore, by optimizing the injection current into the DCSOA, even better performance can be attained 相似文献
18.
N.E. Dahdah R. Coquille B. Charbonnier E. Pincemin C. Kazmierski J. Decobert A. Vedadi G. Aubin A. Ramdane 《Photonics Technology Letters, IEEE》2006,18(1):61-63
We report an original optical wavelength converter for transparent network and high-speed transmission. Based on an electroabsorption modulator (EAM) in cross-absorption modulation configuration, a red-shifted center wavelength filtering of the converted signal decreases the impact of the limited EAM response time. This original and simple device demonstrates wavelength conversion at 40 Gb/s, leading to a reduction of 4.7 dB on the bit-error rate (BER) penalty compared to the case of a centered filter. An absolute 1.8-dB BER power penalty, low switching energy (500 fJ/data pulse) and small applied DC bias are reported. 相似文献
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基于光子晶体光纤四波混频的光波长变换 总被引:1,自引:0,他引:1
研究了光子晶体光纤(PCF)中基于四波混频(FWM)的全光波长变换实现以及相应的变换效能。使用C-L波段内具有平坦正色散特性的高非线性PCF,对基于FWM效应的光波长变换进行了理论分析,根据相应原理进行了波长变换实验系统的软件仿真,并以此为依据设计实验装置进行了实验验证。实验结果基本符合相应的理论计算以及系统仿真,在中心波长为1 5401、545以及1 550 nm的频带范围内分别得到了-17.381、-16.897和-17.787 dB的最高转换效率,分别对应181、7和13 nm的3dB转换带宽。 相似文献