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We demonstrate real-time CD equalization (CDE) for coherent optical transmission systems using a low complexity time-domain (TD) multiplierless finite-impulse response (FIR)-based equalizer, based on a field-programmable gate array (FPGA) implementation. The real-time operation is performed for a single-channel 2.5 Gb/s QPSK optical signal with a performance penalty of only ∼0.15 dB with respect to...
In this paper is presented a new multi-mode interference MMI polarization splitter for Photonic Integrated Circuits PICs. It was designed using the Fraunhofer Heinrich-Hertz-Institut (HHI) commercial multilayer waveguide in Fe doped InP E1700. The central operation wavelength for what this device was designed is 1534 nm. This device can be very useful in the new communication networks for example...
In this invited paper, we describe a rate-adaptive FEC scheme based on LDPC codes together with its software reconfigurable unified FPGA architecture. By FPGA emulation, we demonstrate that this class of rate-adaptive LDPC codes based on shortening with an overhead from 25% to 42.9% provides a coding gain ranging from 13.08 dB to 14.28 dB at a post-FEC BER of 10−15 for BPSK transmission. In addition,...
Related to different international activities in the Optical Wireless Communications (OWC) field Graz University of Technology (TUG) has high experience on developing different high data rate transmission systems and is well known for measurements and analysis of the OWC-channel. In this paper, a novel approach for testing Free Space Optical (FSO) systems in a controlled laboratory condition is proposed...
In this work the penalties induced by the crosstalk in case of optical networks exploiting space-division multiplexing and coherent detection are evaluated. Different QAM modulation formats are considered.
The decades long development in shrinking footprint and improving performance of photonics integrated circuits has seemingly slowed down in recent years, posing problems in e g interconnects in data centers with their ever increasing power requirements. Thus, routes to a continued development towards smaller footprint, lower power, higher performance integrated nanophotonics will be presented and...
This paper reports the experimental performance of spatial division multiplexing (SDM) optical transmission systems. These SDM systems are intended to support key short- and medium-range low-latency applications as optical fronthaul in cellular networks, point-to-point optical backhaul and baseband optical links in datacentre applications. In particular, the experimental demonstration of optical fronthaul...
Optical communication technologies are the best solutions for the high-performance computing infrastructures (HPCs) and datacenter networks (DCNs). All-optical approach consists of switching all data at the packet in the optical domain which requires data rates higher than 100 Gbit/s. The quantum dot (QD) lasers are the promising candidates for such applications due to their high operation rates,...
By means of the dynamic and flexible choice of subcarrier modulation and spacing, frequency division multiplexing is demonstrated to overcome the system bandwidth limits achieving high capacity, both for datacenter interconnections and for multiple access passive optical networks.
Optical parametric amplifiers (OPA) built on glass waveguides are tuneable devices that may be implemented as part of photonic integrated circuits. In this paper, we investigate the performance of recently proposed tellurite OPAs in transparent optical networks (TONs). The dispersion of these OPAs was engineered to provide high gain (∼18 dB) and low ripple (∼4.5 dB) over a bandwidth that is around...
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