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In this paper we discuss filtering schemes for performing wavelength conversion with QD-SOA. We identify that the selection of the optimum filter depends on the operating regimes of the nonlinear device. Experimental implementations of the proposed schemes demonstrate efficient wavelength conversion with high quality factors.
Attention will be paid to cooperative use of linear and nonlinear effects in optical signal processing. This talk reports opportunities and significances of understanding of physical phenomena in order to make further advances in cooperative use of linear and nonlinear effects. In this paper, we focus on optical limiting function using self-phase modulation phenomenon and examine carefully its behaviour...
A 40 Gb/s wavelength and return-to-zero (RZ) to non-RZ (NRZ) pulse format converter is experimentally demonstrated. The converter is based on wavelength conversion in a semiconductor optical amplifier (SOA) and detuned optical filtering. The ideal filter response is investigated, and approximated experimentally cascading two filters, for a 3 ps 40 Gb/s input RZ signal. An undistorted NRZ signal with...
In this paper, a new MAC protocol for OBS networks is introduced, described and evaluated. Into operation, DAOBS avoids burst collisions in the core of the network by controlling the way OBS nodes access the optical channel. Assuming no wavelength conversion capabilities in the network, DAOBS is assessed and compared to standard deflection routing through simulations. From the results, DAOBS offers...
The prospects of optical burst switching (OBS) as a cost-effective optical networking paradigm depend both on the complexity of the network nodes deployed and on the network performance attained. Contention resolution devices, namely wavelength converters and fibre delay line (FDL) buffers, and the size of the optical space switch matrix determine, to a large extent, the complexity of the core nodes...
A new method of phase modulation to amplitude modulation conversion (PM/AM conversion) based on an integrating capabilities of uniform fiber Bragg grating (FBG) was proposed and its use in a wavelength converter was experimentally demonstrated. The wavelength converter was based on cross-phase modulation XPM in 500 m of highly nonlinear fiber. The pulsewidth of input pulses was 1.5 ps and the pulsewidth...
We describe the comparative analysis of the power consumption between optical cross-connect equipment based on electrical and photonic matrix switching, which will be used for future large capacity optical networks. For optical networks that accommodate several Tb/s-class capacity traffic, the power consumption of optical cross-connect equipment based on electrical switching could reach more than...
In this paper we propose a technique to support Quality of Service for Bufferless Optical Packet Switches (OPS) equipped with shared Wavelength Converters (WC). The WCs sharing is fully, that is all of the arriving packets share the same pool of WCs. The QoS, expressed in terms of Packet Loss Probability, is differentiated by giving the packets different priorities in accessing both the output wavelengths...
We review results on the recently developed dispersion-shifted, Chalcogenide waveguides demonstrating nonlinear signal processing on a compact monolithic platform with ultra-broadband capability and moderate launch powers of around 100 mW. Highlight results include broadband wavelength conversion of high-bit rate optical signals, time division multiplexing of 320 Gb/s signals and characterization...
Optical burst switching and packet switching require the adoption of suitable contention resolution mechanisms at the optical nodes due to multiple packets/bursts attempting to access the shared output channel at the same time. Contentions can be solved by exploiting the space, wavelength and time domain. The many alternatives possible call for suitable scheduling policy aiming at an optimal system...
A regenerative optical grooming switch for interconnecting 130 Gbit/s and 40 Gbit/s networks with switching functionality in time, space and wavelength domain is demonstrated. Lab and field demonstrations show the feasibility of the new concept developed by the TRIUMPH project consortia. Q-factors above 20 dB are reported.
Recent advances in the development of photonic switching and transmission systems that exploit hybrid integration technologies are reported. Experimental results using micro-ring resonators, silica interferometers and hybrid integrated wavelength converters for amplitude and phase modulated signals are first evidence of the important role of integrated photonics in developing the next generation optical...
In this paper, we investigate the effect of grooming segment-based traffic on statistical multiplexing gain using simplified edge-node models of optical burst switching (OBS) networks. The objective is to multiplex different bursts on the same output wavelength in order to optimize the bandwidth utilization on the optical fiber. We introduce a particular structure of the burst header packet (BHP)...
An important problem in optical networking is to dimension the network: given the amount of traffic to carry, determine the required amount of network resources (wavelengths). In traditional scenarios, the traffic is specified in terms of a source-destination based traffic matrix. In an optical Grid scenario however, the anycast principle applies: users submit jobs, and generally do not care where...
Gigabit-capable Passive Optical Network (PON) systems, such as GPON (standardized in ITU-T Rec. G.984 series) and 1G-EPON (IEEE 802.3ah, now part of IEEE 802.3-2008) have been standardized and are now being mass-deployed in various markets around the world. With the continuous increase in bandwidth demand generated by consumer and business applications, the need for a new, higher capacity access architecture...
In this paper we present an overview of all-optical generation of vestigial sideband (VSB) signals based on self-phase modulation (SPM) in semiconductor optical amplifiers (SOA) at 10 Gb/s and 40 Gb/s. An optical pump is used to saturate the SOA, avoiding self gain induced distortion. Operation with co- and counter-propagation of the signal and pump is experimentally assessed. Back-to-back sideband...
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