Experimental studies of optical cross-connect nodes with the centralized management of wavelength and timing clock

超大容量骨干网络的使能技术分为两类：大容量传输技术和网络节点的光交换技术。其中，波分复用(WDM)技术的最新进展实现了传输容量的巨大增长，最高可达太比特/秒。另一方面，为了实现超大容量的网络节点，人们已经提出了各种全光交叉连接(OXC)交换机的体系结构，但它们在实际应用中都存在一些关键问题，如所需的光硬件随着OXC节点的规模而急剧增加，OXC中的传输信号质量容易受到损害等。本研究的目的是开发能够应对上述困难的光网络节点技术平台并进行实验验证。在所提出的结构中，仅使用多波长脉冲源I…在网络节点上提供更多数据，并与所有光通道共享。在这种配置中，我们可以通过一个光源来管理信号波长和时序时钟来减少光学硬件。本文的研究成果总结如下：(1)利用光纤中的超连续谱产生技术，研制了具有极低定时抖动的多波长脉冲源。(2)研究了利用光电振荡器(OEO)实现光脉冲的定时提取，实现了定时抖动小于100fS的光时钟源的同步。(3)提出了可重构光网络的在线监测技术，并在实际的WDM传输系统中进行了在线色散监测。(4)基于提出的体系结构设计了一种波长选择性OXC交换机，实现了OXC操作，实现了波长数目的可扩展性。较少

Enabling technologies for ultra-high capacity backbone networks are divided into two categories ; high-capacity transmission technology and optical switching technology at network nodes. Among them, the recent progress in the wavelength-division multiplexing (WDM) technique have achieved the tremendous growth of the transmission capacity up to tera-bit/sec. On the other hand, in order to realize the ultra-high capacity network nodes various architectures of all-optical cross-connect (OXC) switches have been proposed, but they have crucial issues for practical use ; for example, the required optical hardware increases drastically with the size of the OXC node, the quality of the transmission signal can easily impaired in the OXC, and so on.The aim of this study is to develop the technology platform of optical network nodes which can cope with the aforementioned difficulties and to demonstrate it experimentally. In the proposed architecture, only a multi-wavelength pulse source is used i … More n the network node and shared with all optical channels. In this configuration, we can reduce the optical hardware by managing the signal wavelength and the timing clock by one light source. This also leads to the scalability for the number of wavelengths.The results of this studies are summarized as follows ; (1) we developed the multi-wavelength pulse source with the extremely low timing jitter by using the super-continuum generation technique in optical fibers. (2) we investigated the timing extraction of optical pulses by the opto-electric oscillators (OEO), and realized the synchronization of optical clock sources with low timing jitter lower than 100-fs. (3) we developed the in-service monitoring technique for the reconfigurable optical network, and demonstrate the in-service dispersion monitor in actual WDM transmission systems. (4) we developed an wavelength-selective OXC switch based on the proposed architecture and realized the OXC operation which can realize the scalability for the number of wavelength. Less