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Based on a model of a typical operator network we have compared the power consumption of different broadband access technologies and architectures especially DSL, FTTN + VDSL and FTTH. Even though power management improves the performance there is still clear advantage of FTTH with respect to energy efficiency.
Due to the increasing demand for higher transmission capacity, originated from upcoming Triple-Play services, network operators are forced to increase the transmission capacity in the backbone and aggregation networks and drive down the costs per bit/s. Many concepts have been presented, optimizing backbone network and increasing the network capacity by introducing higher data rates or channel count...
Data rates generated in the access network by new services and customer demand on triple play influence on the transmission capacity and flexibility of the transport network. A field trial to upgrade an existing DWDM link with 10 Gbit/s RZ- and NRZ-channels by 40 Gbit/s RZ-DQPSK-channels was performed on a link consisting of legacy G.652 fibre with two ROADM and EDFA amplification only. The field...
In DWDM field experiments over 1047 km of standard fiber and in simulations we analyze the impact of crosstalk on a 43 Gb/s RZ-DQPSK channel both by 10.7 Gb/s OOK and 43 Gb/s RZ-DQPSK neighbors at 50 GHz channel spacing.
In this paper a detailed capital expenditure cost model is presented taking various network elements and node architectures at the WDM layer into account. It was developed within the European NOBEL project [1] and aligned by major European network suppliers and operators. The current cost structure of WDM transport equipment is shown in a normalised format. Typical model applications are also discussed...
In this paper the potential benefits and challenges for the introduction of optically transparent network elements in metro and backbone networks are discussed. The migration from current to next technology generation transport equipment is assessed.
Optical systems and technologies have been radically changing the telecommunication networks for past 15 years; today wavelength division multiplexing (WDM) technology, optical amplifiers, and simple optical switching elements like optical add-drop multiplexers (OADMs) are used in the backbone networks of all operators worldwide. Optical systems nowadays provide the basis for cost-effective transmission...
43-Gbit/s PMD-limited performances of CS-RZ and NRZ have been verified in a joint field trail. CS-RZ showed better performance than NRZ. 2/sup nd/-order PMD of 200 ps/sup 2/ was accommodated in principal state of polarization transmission with FEC.
PMD induced system outage probabilities have been measured in a joint field trial of NTT and DT. For outage evaluation 43-Gbit/s CS-RZ signals of the NTT WDM system were transmitted over selected high-PMD fiber links of DT's fiber network.
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