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Coherent optical systems offer enhanced possibilities to increase data transmission capacity. To implement these systems, optical demodulators are required to decode the data. In this context, optical demodulators for a Quadrature Phase Shift Keying (QPSK) modulation based on 90° hybrid couplers are presented. The devices were produced by direct UV-laser patterning on sol-gel derived organic-inorganic...
An eight-channel multi-format coherent optical transceiver is proposed as an alternative to implement terabit metro inter-data centre interconnects (DCI) transmitting from 800 to 1600 Gb/s over conventional single mode fibre (CSMF). The maximum reach of the system as a function of transmitted power and overall capacity is numerically estimated for a BER target of 1×10−13, avoiding the use of optical...
In this paper we present real-time transmission performances up to 25 Gbit/s for optical access network. Our solution is based at transceiver side on pre-coded NRZ and electrical duo-binary modulations using limited electrical bandwidth DML in C and O band. At the receiver side, an electrical duo-binary receiver based on an 8 GHz APD photodiode combined with an online duo-binary to binary converter...
A carrier-suppressed reflective coherent passive optical network (CS-R-CO-PON) for mitigating optical interference is presented. Using an external modulator, the optical carrier of the upstream signal was suppressed and unwanted optical interferences, including the carrier-induced optical beat interference and Rayleigh backscattering, were effectively mitigated. Through experimental verification,...
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...
The availability of low cost commercially available components operating at 60 GHz, mainly driven by the approval of the consumer oriented IEEE 802.11ad and 802.15.3c standards, is expected to boost the deployment of 60 GHz wireless networks where an unlicensed band with around 7 GHz bandwidth is available. Nevertheless, the transmission of 60 GHz wireless signals is limited to a few meters (∼10 m),...
The dramatic increase in demand for services that require high bandwidth and augmented bitrate to function properly has become a trend in recent years. In order to comply with the current demand, telecom companies struggle to enlarge the offered capacity as well as to minimize the latency and to enhance the reliability of the network. An effective technique to increase the capacity is to move to higher...
In this paper, we demonstrate a reconfigurable optical orthogonal frequency division multiplexing (OFDM) signal transmitter based on a sliced broadband amplified spontaneous emission (ASE) optical source for directly detected (DD) multiband OFDM next generation wavelength division multiplexed (WDM) access networks. Theoretical predictions and experimental demonstrations validate the feasibility of...
The relentless traffic growth in datacenter networks is stimulating the adoption of pioneering optical interconnect technologies as well as their integration with novel network and switching architectures. Even more, the need for disaggregation of data storage and processing resources significantly increases the capacity and dimensioning requirements of such networks. In this context, a novel datacenter...
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