Eight Gigabit Ethernet channels are multiplexed to a 10 Gb/s stream and sent over 1020 km of in-ground fiber. By daisy chaining channels, longer Gigabit Ethernet paths are emulated. Bulk transfer at 947 Mb/s was demonstrated with computer separations of 2040 km using TCP.
The integration of electronic routing functions with WDM functions in network elements capable of reconfiguration over short time scales enables access networks to efficiently service time varying demand. An effective coordination of electronic and WDM network functions allows traffic to bypass electronic to optical conversion within the access network. The cost benefits derived from reduced transponder use due to this coordination can result in lower cost access for end users. The transparency of WDM also allows heterogeneous traffic formats to be carried over a common fiber. In this paper, we describe a reconfigurable WDM access network testbed that incorporates features outlined above. This testbed was used in demonstrating network functions such as dynamic lightpath provisioning, packet flow-switching, and remote amplification for supporting large numbers of end users. The testbed network incorporates protection switching and network control capabilities. The testbed network also provides connectivity to an in-ground long haul network. The testbed architecture and description of networking experiments demonstrating its capabilities are presented. The throughput degradation due to optical flow switching for Transport Control Protocol (TCP) data transmissions over large bitrate-delay product links is characterized. Adding the Eifel Algorithm to the TCP implementation restored performance. The performance of a remotely pumped EDFA for serving many users in the collection/distribution network is also presented.
Bossnet is an in-ground testbed for developing optical networking techniques that enable new applications. The use of in-ground fiber (as opposed to laboratory experiments) allows new applications that require high data-rate communications over long distances to be tested. For the experiments described here, the light path includes ten spans of optical fiber with distances varying between 40 km and 73 km located on telephone poles and in the ground near railroad tracks and roadways. After each link, the light is amplified, filtered, and chromatic dispersion compensated. The experiment operates one 40-Gb/s RZ (return-to-zero format) channel at 193.5 THz and seven other channels with 10-Gb/s NRZ (non-return-to-zero format) modulation over a distance of 295 km from Lincoln Laboratory to New London, CT. These channels are
This paper describes recent developments in modelocking techniques for ultrashort pulse generation in solid stat lasers. Studies in Ti:Al2O3 provide a model system for examining different modelocking approaches. Special emphasis is placed on the use of additive pulse modelocking for achieving passive modelocking using a fast saturable absorber-like mechanism. Different models of APM are described and its extensions to other solid state laser materials are discussed.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.