Sylvia Smolorz

Demonstration of a coherent UDWDM-PON with real-time processing

A filterless coherent PON with channel spacing down to 2.8 GHz and real-time processing in an FPGA is demonstrated. 64-channel operation is verified experimentally using SSB generation at the OLT and fully integrated ONU transceivers.

Demonstration of a 32

We report on a hybrid DWDM-TDM A optical access network that provides a route for integrating access and metro net- works into a single all-optical system. The greatest challenge in using DWDM in optical access networks is to precisely align the wavelength of the customer transmitter (Tx) with a DWDM wave- length grid at low cost. Here, this was achieved using novel tunable, external cavity lasers in the optical network units (ONUs) at the customers end. To further support the upstream link, a 10 Gb/s burst mode receiver (BMRx) was developed and gain-stabilized erbium-doped fiber amplifiers (EDFAs) were used in the network experiments. The experimental results show that 10 Gb/s bit rates can be achieved both in the downstream and upstream (operated in burst mode) direction over a reach of 100 km. Up to 32 × 50 GHz spaced downstream wavelengths and another 32 × 50 GHz spaced upstream wavelengths can be supported. A 512 split per wave- length was achieved: the network is then capable of distributing a symmetric 320 Gb/s capacity to 16384 customers. The proposed architecture is a potential candidate for future optical access net- works. Indeed it spreads the cost of the network equipment over a very large customer base, allows for node consolidation and integration of metro and optical access networks into an all-optical system.

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A new architecture for the delivery of 1 Gbit/s sustained to about thousand customers over a shared fibre infrastructure is presented. The architecture is compatible to installed fiber infrastructures and a seamless upgrade is possible.

512 Split, 100 km Reach, 2

We present a simulative investigation of the influence of phase ripple distortions of FBGs on different modulation formats. Statistical ripple characteristics emulate a realistic system setup.

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Quantum cryptography circumvents the threat on classical cryptography due to quantum computers. Its integration into WDM transmission systems is a key point in its commercial deployment. The necessary pre-requisites are discussed in this paper.

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The strategic objective of the European Union to provide broadband access for all of its citizens and also to develop technologies suitable for worldwide use leads to a number of projects aiming on different stages of the technological evolution of next generation fibre-to-the-X access networks. In order to catch up the revenue gap novel technologies are required that offer reduced CAPEX and OPEX. This can be obtained by a converged metro and access network with enhanced reach and splitting factor. Within the project MUSE for the first time a full-functional prototype of a future 10/2.5Gbit/s XL-PON (eXtra Large Passive Optical Network) system was realized and tested. The prototype systems consists of OLT, ONT, and an intermediate stage, called Metro Access Point (MAP) which contains optical amplifiers and a burst-mode transponder for 2.5Gbit/s. The XL-PON prototype fulfils all major requirements of a future next-generation PON1. The PIEMAN project which started a year later researches the physical layer of a symmetrical 10 Gbit/s, 32 wavelength, 100 km reach and 512 way split access network2 and shows very promising results until today. Both PIEMAN and XL-PON are intermediate steps towards the goal of a fully reconfigurable, fully tuneable combined WDM and TDM access networks which offers a multitude of services on a multitude of wavelength which are routed and activated as the demand requires.

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A novel DWDM-TDMA PON with symmetric 320Gb/s capacity shared between 16384 customers is demonstrated. Upstream channels were tested in burst-mode and featured low-cost tuneable lasers, monolithically integrated SOA-EAMs, burst-mode EDFAs and a 10Gb/s burst-mode receiver.