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Data-intensive Grid applications require huge data transferring between multiple geographically separated computing nodes where computing tasks are executed. For a future WDM network to efficiently support this type of emerging applications, traditional approaches to establishing lightpaths between given source destination pairs are not sufficient because a computing task may be executed on any one...
We present a novel technique to measure the real-time differential optical phase spectrum from spectral interference pattern. Good measurement results are obtained on both linear and nonlinear cases through experiment and analytical simulation. From these measured results we can obtain accurate all order PMD information for the optical signal and correspondingly compensate the impairment in optical...
We show 8 times 11.5-Gb/s (10-Gb/s after coding) optical OFDM transmission over 1000 km SSMF with conventional DFB lasers and direct-detection. Compared with the coherent-detection using ECL lasers, DFB lasers and direct-detection can significantly reduce the system complexity and cost.
We propose and experimentally demonstrate a 40-Gb/s wavelength-division-multiplexing passive optical network (WDM-PON) with a centralized directly-modulated laser (DML) source for the first time. In the central office (CO), a DML operating at 42.8- Gb/s with high driven bias and low extinction ratio (ER) is employed for carrying downstream data. In the remote node (RN) or optical network unit (ONU),...
We propose wireless intermediate frequency (IF) signal over wavelength division multiplexing (WDM) passive optical networks (WDM-PON), and experimentally evaluate its feasibility and performance with eight channels of OFDM signals, for both downstream and upstream scenarios.
This paper analyzes power fluctuation caused by interaction of fiber cut, add/drop operation, EDFA transients and ROADM attenuation adjustment in WDM networks. A state-based power control algorithm is proposed and tested in our simulation system.
We designed and built a novel all-optical re-timing, re-amplifying, and re-shaping (3R) regeneration system based on terahertz optical asymmetric demultiplexers (TOADs) developed in our laboratory. The system is capable of parallel processing multiple wavelengths, a feature which will significantly improve the scalability of current wavelength division multiplexing (WDM) networks. Performance against...
Todaypsilas access network is migrating towards broadband IP, fixed/mobile convergence and service convergence. Thus, the next generation access network (NGAN) requires a converged optical/wireless access network infrastructure, other than the existing architecture that connect to the cellular, broadband wireless, and optical access networks separately, which complicate the network and increase the...
We present the first demonstration of an agile WDM-PON architecture compatible with radio-over-fiber system to provide 2.5Gbit/s symmetric data services. Several enabling techniques are employed to increase transmission capacity while keeping low cost.
We introduce the applications and technologies of tunable demultiplexers/multiplexers (DeMUX/MUX) in wavelength division multiplexing (WDM) networks. We also propose a novel solution using fixed waveband filters to achieve similar provisioning flexibility and reduced control complexity.
We demonstrate a novel WDM passive optical network (WDM-PON), which delivers data as well as video services to the end users through the employment of subcarrier modulation at the optical line terminal (OLT) and parallel signal detection (PSD) at the optical network unit (ONU). Experimental results show that the proposed WDM-PON is capable of providing triple play services in the access network.
A novel WDM-PON architecture with centralized lightwave source in the optical line terminal (OLT) for providing triple play services has been proposed and demonstrated. Triple play service provision with 2.5 Gbit/s video signals, 10 Gbit/s downstream signals, and 10 Gbit/s upstream signals per channel has been successfully realized.
In this paper, we show OFDM can adaptively compensate for large all-order PMD without requiring feedback. We demonstrate error-free transmission on a 1920km 40xlOGb/s DWDM link with 48ps mean DGD in presence of fiber nonlineariry.
We have successfully demonstrated that an inversion-RZ pulse signal can be employed in a 50Gbit/s RZ-DQPSK payload per channel and 50GHz channel spacing optical packet switching network as an orthogonal modulation optical label. This inversion-RZ optical label is generated by a novel and simple scheme.
A novel wavelength-division multiplexing passive optical network architecture with the capability to provide triple-play services (TPS) with a source-free optical network unit has been proposed and experimentally demonstrated. TPS provision with two 2.5-Gb/s, 10-Gb/s downstream signals and 10-Gb/s upstream signals per channel has been successfully realized
The cascaded filtering effect in multi-granularity optical cross-connect (OXC) nodes is studied. We perform simulation and conduct 40 Gb/s transmission experiment on waveband deaggregator-based hierarchical OXC node. The results show that wavebands experience less cascading effect than individual wavelengths
We experimentally demonstrate spectral efficient transmission of 40Gbps per channel in 50GHz-spaced DWDM exploiting optical carrier suppression and separation technique and optical duobinary modulation with less than 2.0dB power penalties at 10-10 BER and transmission distnces of over 200km.
There could be some approaches to realize 40 Gb/s DWDM system in the real service providers network. The most realistic approach will be the migration from existing 10 Gb/s DWDM system. We will discuss those scenarios and their issues and countermeasures.
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