A record low loss (3.5dB/km) for a wide operating bandwidth HC-PBGF is reported. Detailed time-of-flight measurements are also presented, enabling first measurements of latency and differential group delay between mode groups in HC-PBGF.
Abstract:We present a black-box four wave mixing based bit-rate-flexible phase sensitive amplifier and use it in the first demonstration of 40 Gbit/s DPSK phase regeneration.
Abstract:We report the first field-trial of a phase and amplitude regenerator highlighting the practicality of the technology. Sensitivity improvement and mitigation of transmission-induced noise with the regenerator placed in-line or at the receiver is demonstrated.
IntroductionPhase and amplitude noise introduced during transmission both from optical amplifiers and the nonlinear interactions both within and between channels represents a significant limiting factor to data transmission using phase-shift keyed, PSK, modulation formats [1], [2]. Thus, the development of regeneration schemes capable of eliminating phase and amplitude noise for PSK signals is of great interest. Recently, we demonstrated a networkcompatible regenerator for simple two-level PSK encoded signals [3] and also suggested how the technology might be scaled up to allow the regeneration of more spectrally-efficient modulation formats [4]. Following our first proofof-principle demonstrations, we redesigned the two-level PSK regenerator to allow in-field tests and demonstrated its capability to operate in the presence of broadband phase noise [5] (the noise was emulated in these experiments by direct phase modulation of the signal).However, in order to truly establish the viability and capability of the technology several key further tests are required. Firstly, it is essential to establish that the regenerator can process the forms of noise generated in a real network using typical network parameters (e.g., using a DWDM network operating within the C-band subject to realistic environmental perturbations e.g. polarization drifts/acoustic perturbations) rather than noise generated by artificial means in the laboratory. Moreover, in all experiments to date, only the performance of the regenerator when placed immediately in front of the receiver was characterized -highlighting the ability to correct for particular classes of error in differentially decoded systems [5]. The natural position of such regenerators however, is along the transmission line, where they can be used to reduce the build up of non-linear noise during signal propagation. Thus, the demonstration and testing of the regenerator as an in-line device is a matter of prime importance.Here, we address both of these issues, demonstrating the key capabilities of the regenerator when operated as inline device in a real network. For the purposes of this demonstration, we used 38 DWDM 40 Gbit/s channels on a 100 GHz grid covering most of the C-band (total capacity approaching 1.5 Tbit/s) and 400 km of installed fiber.
Abstract:We utilize four wave mixing to precisely multiply the modulation depth of a phase encoded signal, demonstrating 3-extra effective bits of resolution at 32GHz. The technique enables a new class of optical signal processing functions.
Event based simulations are an important scientific application in many fields. With the rise of cluster computing, distributed event simulation optimization becomes an essential research topic. This paper identifies cross-node event queues as a major source of slow down in practical parallel event simulations and proposes dynamically moving entities between nodes to minimize such remote event queues. The problem statement is formalized and an algorithm based on an approximation algorithm for the Capacitated Minimum K-Cut Problem is proposed. The algorithm is simulated and results are presented that show its effectiveness. For simulations with reasonably regular structural relationships between entities, reductions of remote entity queues from 80 to 90 % are demonstrated.
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