All-optical wavelength converters for phase modulated data signals in system experiments
系统实验中用于相位调制数据信号的全光波长转换器
基本信息
- 批准号:78169643
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Research Grants
- 财政年份:2008
- 资助国家:德国
- 起止时间:2007-12-31 至 2010-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
This follow-up project is part of a joint research programme of two Chinese groups at the Tsinghua-University (THU, Beijing, China) and of three German groups (Technical University Berlin (TUB), University of Paderborn (UOP), Fraunhofer-lnstitute for Telecommunications - Heinrich-Hertz-Institut (HHI)). The frame of scientific cooperation is, as in the first two years of the project, the topic of contention resolution in optical burst switching (OBS) networks by wavelength conversion.The objective of this sub-project is to continue the experimental investigation on all-optical wavelength converters (AOWCs) based on the results of the previous project period. The investigated wavelength converters will use nonlinear optical effects in functional fibers like highly nonlinear fibers (HNLF), in periodically poled Lithium Niobate (PPLN) and in semiconductor optical amplifiers (SOA). The investigated devices are partly realized by the sub-projects of the other partners, e.g. the UOP (PPLN-based devices) and Tsinghua- University (SOA-based devices) and partly by the HHI within this sub-project {HNLFbased devices). The focus is on AOWCs, which are transparent to the modulation format, i.e. which can be operated with phase-modulated and amplitude modulated optical data signals. The physical layer developments in long-distance transport in the previous project period have confirmed the rapid growing importance of advanced phase modulation formats (such as differential-phase-shift keying (DPSK) and differential quadrature phase shift keying (DQPSK) [1]). Therefore the follow-up project will continue to focus on conversion of higher order phase modulated data signals.Based on the results of the previous project period, the work in next two year period will concentrate on three main topics. The first is four-wave mixing and optical parametric amplification in HNLF using advanced pumping schemes and improved functional fibers. The second is the use of a new scheme (difference and sum frequency generation) in PPLN for wavelength conversion and the basic consideration of optical parametric amplification in PPLN. Due to promising results obtained by the Chinese project partners, the third topic will be four-wave mixing in SOAs. The investigations on AOWC concepts based on SOAs will be done in close collaboration with the Chinese partners. The developed AOWC concepts will be characterized and compared using the evaluation criteria derived in the previous project period and by system experiments with symbol rates of 10, 40, 80 and 160Gbaud. Recently research on transmission systems with 100Gbit/s using symbol rates of 50 and lOOGbaud in combination with higher order modulation formats has intensified. The main reason is a growing interest, also from standardization bodies like IEEE or ITU-T, in lOOGbit Ethernet as a new technology in local, metro and long-haul transport. Therefore the use of 50 or 100 Gbaud in the system experiments will be considered, depending on the availability of the required subcomponents.To allow investigations on SOA-based AOWCs in cooperation with the Chinese partners, the initially planned work on dynamic response and transient behaviour of AOWCs at the HHI will be reduced to theoretical investigations, mainly done by the UOP and the TUB.
该后续项目是清华大学两个中国研究小组(THU,中国北京)和三个德国研究小组(柏林工业大学(TUB)、帕德博恩大学(UOP)、弗劳恩霍夫电信研究所 - 海因里希-赫兹研究所(HHI))联合研究项目的一部分。与该项目的前两年一样,科学合作的框架是通过波长转换解决光突发交换(OBS)网络中的争用问题。该子项目的目标是在上一个项目期间的成果的基础上继续对全光波长转换器(AOWC)进行实验研究。所研究的波长转换器将在功能光纤中利用非线性光学效应,例如高度非线性光纤(HNLF)、周期性极化铌酸锂(PPLN)和半导体光放大器(SOA)。所研究的设备部分是由其他合作伙伴的子项目实现的,例如UOP(基于 PPLN 的设备)和清华大学(基于 SOA 的设备)以及部分由 HHI 在此子项目(基于 HNLF 的设备)中提供。重点是 AOWC,它对调制格式是透明的,即可以使用相位调制和幅度调制的光数据信号进行操作。上一个项目期间长途传输物理层的发展证实了先进相位调制格式(例如差分相移键控(DPSK)和差分正交相移键控(DQPSK)[1])的重要性迅速增长。因此,后续项目将继续关注高阶相位调制数据信号的转换。基于上一项目阶段的成果,未来两年的工作将集中在三个主题上。第一个是 HNLF 中的四波混频和光参量放大,使用先进的泵浦方案和改进的功能光纤。二是在PPLN中使用新方案(差频和和频生成)进行波长转换以及PPLN中光参量放大的基本考虑。由于中国项目合作伙伴取得了可喜的成果,第三个主题将是 SOA 中的四波混频。基于 SOA 的 AOWC 概念的研究将与中国合作伙伴密切合作进行。所开发的 AOWC 概念将使用上一个项目期间得出的评估标准以及通过符号率为 10、40、80 和 160Gbaud 的系统实验进行表征和比较。最近对使用50和100Gbaud符号率并结合高阶调制格式的100Gbit/s传输系统的研究已经加强。主要原因是IEEE或ITU-T等标准化机构对100Gbit以太网作为本地、城域和长途传输中的新技术的兴趣日益浓厚。因此,根据所需子组件的可用性,将考虑在系统实验中使用 50 或 100 Gbaud。为了与中国合作伙伴合作研究基于 SOA 的 AOWC,最初计划在 HHI 进行的 AOWC 动态响应和瞬态行为工作将简化为理论研究,主要由 UOP 和 TUB 完成。
项目成果
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