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Berlin, Germany

Louchet H.,VPIphotonics | Kuzmin K.G.,Development Center | Richter A.,VPIphotonics
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2014

The need for software-defined transmissions raises new challenges for the transceiver design: multiple modulation formats have to be supported to accommodate for varying bandwidth demand and physical characteristics of different optical paths. In order to keep the receiver complexity and cost low, most of the digital signal processing functionalities should be shared by the different formats. In this paper we address the problems of carrier frequency and phase recovery as well as the tracking of fast polarization rotations for arbitrary constellations in two or four dimensions. We first report how not only carrier frequency recovery but also ADC sampling error correction can be performed using a modulation-format independent frequency-domain approach. We then report a framework where the combined impact of phase error and fast polarization rotation can be described by a rotation in a four-dimensional space and show how to efficiently estimate and compensate this rotation. We finally investigate the dynamic performance of the reported algorithms for polarization-switched QPSK and 4D 32QAM constellations using numerical simulations. © 2014 Copyright SPIE.

Louchet H.,VPIphotonics | Kuzmin K.,Development Center | Richter A.,VPIphotonics
IEEE Photonics Technology Letters | Year: 2014

We introduce a framework where the combined impact of phase noise and fast polarization rotation can be described by a rotation in a four-dimensional space. Based on this outcome, we propose an equalization scheme performing joint carrier-phase and polarization rotation recovery that can be applied to arbitrary two- or four-dimensional signal constellations. After discussing practical implementation issues for this scheme, we show by means of numerical simulations that the performance of the proposed scheme is comparable with state-of-the-art equalization algorithms for the DP-QPSK, PS-QPSK, and 4D-32QAM modulation formats. © 1989-2012 IEEE.

Louchet H.,VPIphotonics | Richter A.,VPIphotonics
Asia Communications and Photonics Conference, ACP | Year: 2014

We show how the Importance Sampling method can be used to accurately estimate the bit-error-rate of coherent transmission systems including digital signal processing and forwarderror-correction under non-AWGN channel assumption. © 2014 OSA.

Abbasi A.,Ghent University | Spatharakis C.,National Technical University of Athens | Kanakis G.,National Technical University of Athens | Andre N.S.,VPIphotonics | And 9 more authors.
Journal of Lightwave Technology | Year: 2016

An integrated laser source to a silicon photonics circuit is an important requirement for optical interconnects. We present direct modulation of a heterogeneously integrated distributed feedback laser on and coupled to a silicon waveguide. We demonstrate a 28 Gb/s pseudo-random bit sequence non-return-to-zero data transmission over 2 km non-zero dispersion shifted fiber with a 1-dB power penalty. Additionally, we show 40-Gb/s duobinary modulation generated using the bandwidth limitation of the laser for both back-to-back and fiber transmission configurations. Furthermore, we investigate the device performance for the pulse amplitude modulation (PAM-4) at 20 GBd for high-speed short-reach applications. © 2015 IEEE.

Andre N.S.,VPIphotonics | Habel K.,Fraunhofer Institute for Telecommunications, Heinrich-Hertz-Institut | Louchet H.,VPIphotonics | Richter A.,VPIphotonics
Optics Express | Year: 2013

We report experimental validations of an adaptive 2nd order Volterra equalization scheme for cost effective IMDD OFDM systems. This equalization scheme was applied to both uplink and downlink transmission. Downlink settings were optimized for maximum bitrate where we achieved 34Gb/s over 10km of SSMF using an EML with 10GHz bandwidth. For the uplink, maximum reach was optimized achieving 14Gb/s using a low-cost DML with 2.5GHz bandwidth. © 2013 Optical Society of America.

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