Gustavo Puerto

All-Optical flip-flop operation using a SOA and DFB laser diode optical feedback combination

We report on the switching of an all-optical flip-flop consisting of a semiconductor optical amplifier (SOA) and a distributed feedback laser diode (DFB), bidirectionally coupled to each other. Both simulation and experimental results are presented. Switching times as low as 50ps, minimal required switch pulse energies below 1pJ and a repetition rate of 1.25GHz have been measured. Contrast ratios over 25dB have been obtained. The dependence on the pulse length and CW input power of the minimal required switch energy is investigated.

Symmetric reconfigurable capacity assignment in a bidirectional DWDM access network.

This paper presents a novel architecture for DWDM bidirectional access networks providing symmetric dynamic capacity allocation for both downlink and uplink signals. A foldback arrayed waveguide grating incorporating an optical switch enables the experimental demonstration of flexible assignment of multiservice capacity. Different analog and digital services, such as CATV, 10 GHz-tone, 155Mb/s PRBS and UMTS signals have been transmitted in order to successfully test the system performance under different scenarios of total capacity distribution from the Central Station to different Base Stations with two reconfigurable extra channels for each down and upstream direction.

Selective multicast in a dynamic wavelength router for DWDM converged wired/wireless access networks

Transmission of selective multicast services has been demonstrated in a cost-effective dynamic channel allocation router. The approach envisions heterogeneous infrastructures with unicast, broadcast and multicast-related functions on a radio over fiber access network.

Systems measurements of 2/spl times/2 poled fiber switch

The performance of a 2/spl times/2 all-fiber electrooptical switch is characterized in a system at up to 40 Gb/s. Error-free transmission is demonstrated. The device was also employed as a protection switch at 10 Gb/s in an installed fiber link.

Systems measurements of 2 × 2 poled fiber switch

The performance of a 2/spl times/2 all-fiber electrooptical switch is characterized in a system at up to 40 Gb/s. Error-free transmission is demonstrated. The device was also employed as a protection switch at 10 Gb/s in an installed fiber link.

Wavelength Data Rewriter for Centralized-Source Radio-Over-Fiber Access Networks

We present the architecture of a wavelength data rewriter that enables the centralization of optical sources in converged wired/wireless radio-over-fiber (RoF) access networks. In our proposal, wavelength reuse of downlink channels is enabled for uplink purposes. The system is based on a data extinction technique by gain saturation in a semiconductor optical amplifier (SOA). A Fabry-Pérot filter allows envisioning heterogeneous infrastructures for converged wired and wireless signals transport while it relaxes the requirements on the SOA by allowing the use of low bandwidth devices whose cut-off frequency is lower than the subcarrier. In addition, the extinction ratio requirements of the downstream signal are relaxed as well, in order to avoid high power penalties on the upstream signal. The architecture is experimentally tested in an RoF access network with dynamic channel allocation capabilities.

Payload-Label Tolerance in Subcarrier Multiplexing Optical Label Switching Routers

We present a theoretical and experimental evaluation of the tolerance between optical labels and payloads in an optical router with 10-Gb/s packet payload and 155-Mb/s subcarrier multiplexing encoded label. The label processing functions are described in detail and alignment aspects are precisely evaluated by changing separately the arrival time of both label and payload signals. For the first time to our knowledge the experimental verification allows us to evaluate the delay tolerance in the process of coding the baseband label onto the optical packet without affecting the normal operation of the router. According to the router parameters, the maximum range of misalignment is estimated to be around 100-120 ns.

Dimensioning of 10 Gbit/s all-optical packet switched networks based on optical label swapping routers with multistage 2R regeneration.

This paper describes both the experimental and theoretical investigations on the cascadability of all-optical routers in optical label swapping networks incorporating a multistage wavelength conversion with 2R regeneration. A full description of a novel experimental setup allows the packet by packet measurement up to 16 hops with 10 Gb/s payload showing 1 dB penalty with 10(-12) bit error rate. Similarly, the simulations on the system allow a prediction on the cascadability of the router up to 64 hops.

New label processing for routing optical packets

In this paper a promising optical packet switching node concept is presented for optical packet switched networks. We developed a new label processing approach for core nodes in a subcarrier multiplexed label swapping network with advantageous implemented functionalities. We present the experimental results of the implemented node.

Recent Advances on Optical Label Swapping Techniques: An Approach to the Final Results of IST-LABELS Project

We describe the layout and results of the final WDM-SCML label swapping demonstrator of the IST-LABELS project. Some key technologies were employed or design optimised to perform specific functions into the demonstrator: advanced fibre Bragg gratings devices for the SCML packet generation and optical prefiltering. Header electronic processing unit and RF subcarrier generator. Wavelength conversion and regeneration stages for payload XGM+XPM and optical routing stages based on fast tunable lasers. The end to end routing operation of a WDM SCML optical label swapping node has been demonstrated for the first time to our knowledge