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Recently, network services based on distributed components that provide services by using components running on remote nodes have attracted much attention. Advanced services can be provided at a lower cost by using existing components. We have previously proposed a method that ensures a stable QoS for each service by allocating components dynamically according to changes in access frequency. In that...
A hybrid Raman-OPA amplifier with 190 nm bandwidth, and <4dB gain ripple is described. We also show that inclusion of the forth order dispersion coefficient is critical for the correct optimization of the gain bandwidth of the hybrid amplifier.
We investigate a filtering effect and its mitigation method in a WDM-PON based on ASE injection seeding. The pre-filter has optimum bandwidth as a function of the injection power for mitigation of the RIN degradation.
We develop an electronic phase equalization technique for the phase-modulated signal generated by using the bandwidth-limited RSOA. The effectiveness of this technique is demonstrated in the 10-Gb/s, 80-km-reach WDM PON implemented by using directly-modulated TO-can packaged RSOAs and digital coherent receivers.
The time for an all-optical network is already here. The huge capacity of the optical resources, in backbones, distribution and access networks cannot be completely used by current services. The remainders can be used under the deployment of new models for service provisioning. Network virtualization is considered as a serious candidate to enable the flexible provision of services in the future Internet...
A network-embedded self-tuning cavity based on a self-seeded RSOA is analysed with particular regards to the impact of some parameters that characterize the transmitter. The cavity is defined by the SOA reflective mirror and a Faraday rotator mirror at the remote node, which allows polarization independent operation with low PDG RSOAs. The majority of the cavity is formed by the distribution fibre,...
In this paper, a fast wavelength switching protocol to deal with the RTT drift problem in WDM/TDM-EPON system is proposed. Estimated process time revealed one sixth reduction of the switching time can be available.
In this work, we propose an efficient resource management approach for WDM-PON ring architectures that supports dynamic bandwidth allocation and sharing of downstream wavelengths. We propose a modification in the ONU design, to dynamically setup virtual circuits for inter-ONU communication. The reservation mechanism is arbitrated by the OLT, which also monitors the traffic imbalances of downstream...
A dynamic, wideband model for simulation of spatial-temporal distribution of photons and carriers in a bulk InP-InGaAsP reflective semiconductor optical amplifier (RSOA) is presented. Saturation and noise characteristics are successfully predicted and in good accordance with theoretical predictions found in literature. Based on RSOA model and a model for access network link, numerical optimization...
We compare the transmission performance of 413-Gb/s multi-band OFDM with 32-QAM (7%FEC) and 64-QAM (20%FEC) by simulations. The reachable distance with 64-QAM is longer than 32-QAM due to the filtering effects of 50-GHz-grid ROADMs.
In recent years, the rise of always-on broadband internet access networks has fuelled a huge rise in global data bandwidth demand. The availability of video streaming services such as Youtube has pushed video into the primary data format used across global networks. Cisco has predicted that by 2014 80% of all internet traffic will be video. This is placing tremendous stress on the global communications...
Recent progress on WDM-PON system development, optical technology, and commercialization status of its optical component and module are described. And also are described recent achievements and activities in standardization related with WDM-PON.
A 1.25-Gbit/s 2WDM/2OCDM signal is generated from a 6-nm bandwidth SC signal supplied from OLT. The SC-signal is spectrum-sliced and OOK-modulated with RSOAs in ONUs. The upstream transmission shows BERs<10−9 over 20 km of SMFs.
So far latency has been regarded as a minor issue in Passive Optical Networks (PONs). However it may become a key factor for the commercial success of PON and WDM-PON. In this work we review the relevance of very-low latency in the access as the enabler of new higly-interactive cloud services. Then, we propose an approach for delay-based differentiation in PON that causes the delay variance to become...
In this paper we investigate the multicast advance reservation problem in wavelength division multiplexed (WDM) optical networks. Under the advance reservation traffic model (also know as scheduled traffic), connection requests specify their start time to be some time in the future and also specify their holding times. Traditionally, in WDM networks, the multicasting functionality is supported by...
In this paper, we propose a multipath routing algorithm, which uses inverse multiplexing technique, to provision reliable degrade-services over NGS/WDM networks. Compared with previous models like effective bandwidth and fractional bandwidth reliable multipath mechanisms, our proposed service model could contribute concreteness to service level contracts such that customers¡¦ tradeoff between bandwidth...
A validation of the GMPLS unified control plane deployed within the ADRENALINE testbed for dynamic provisioning in multi-layer networks is presented. We experimentally compare two on-line path computation mechanisms aiming at exploiting the grooming functions.
This paper proposes a novel Spectrum Compactness based Defragmentation scheme to maximize the profitability of defragmentation. Numerical simulation shows that there exists an optimum load region to operate defragmentation.
We propose a 10 Gb/s WDM-PON architecture that exploits a colorless Optical Network Unit, encompassing a self-seeded broadband uncooled Fabry-Perot laser diode and external modulation. We demonstrate low-penalty transmission over 25 km common fiber.
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