Nonlinear transmission of 6PolSK-QPSK signals using coded modulation and digital back propagation. - Takahito Tanimura; Saleem Alreesh; Johannes Karl Fischer; Carsten Schmidt-Langhorst; Felix Frey; Christian Meuer; Robert Elschner; Lutz Molle; Colja Schubert (OFC/NFOEC, 2013)

Transmission of 512SP-QAM Nyquist-WDM signals. - Johannes Karl Fischer; Carsten Schmidt-Langhorst; Saleem Alreesh; Robert Elschner; Felix Frey; Pablo Wilke Berenguer; Lutz Molle; Markus Nolle; Colja Schubert (ECOC, 2014)

Efficient real-time implementation of a channelizer filter with a weighted overlap-add approach. - Felix Frey; Robert Elschner; Christoph Kottke; Colja Schubert; Johannes K. Fischer (ECOC, 2014)

Performance comparison of different 8QAM constellations for the use in flexible optical networks. - Markus Nölle; Felix Frey; Robert Elschner; Carsten Schmidt-Langhorst; Antonio Napoli; Colja Schubert (OFC, 2014)

Experimental analysis of nonlinear interference noise in heterogeneous flex-grid WDM transmission. - Carsten Schmidt-Langhorst; Robert Elschner; Felix Frey; Robert Emmerich; Colja Schubert (ECOC, 2015)

5 Gbit/s real-time processing using π/4-shift DQPSK for bidirectional radio-over-fibre system. - Kai Habel; Luz Fernandez del Rosal; Stefan Weide; Jonas Hilt; Volker Jungnickel; Robert Elschner; Colja Schubert; Felix Frey; Johannes Karl Fischer; Ronald Freund (ICTON, 2015)

Experimental investigation of a four-dimensional 256-ary lattice-based modulation format. - Tobias A. Eriksson; Saleem Alreesh; Carsten Schmidt-Langhorst; Felix Frey; Pablo Wilke Berenguer; Colja Schubert; Johannes K. Fischer; Peter A. Andrekson; Magnus Karlsson 001; Erik Agrell (OFC, 2015)

Investigation of CAZAC sequences for data-aided channel estimation considering nonlinear optical transmission. - Markus Nolle; Felix Frey; Robert Elschner; Carsten Schmidt-Langhorst; Johannes K. Fischer; Colja Schubert (OFC, 2015)

112 Gb/s PDM-PAM4 Generation and 80 km Transmission Using a Novel Monolithically Integrated Dual-Polarization Electro-Absorption Modulator InP PIC. - Moritz Baier; Francisco M. Soares; Zhennan Zheng; Carsten Schmidt-Langhorst; Robert Elschner; Felix Frey; Marko Gruner; Johannes Karl Fischer; Colja Schubert; Martin Moehrle; Norbert Grote; Martin Schell (ECOC, 2017)

Single-step Perturbation-based Nonlinearity Compensation of Intra- and Inter-Subcarrier Nonlinear Interference. - Felix Frey; Lutz Molle; Robert Emmerich; Colja Schubert; Johannes K. Fischer; Robert F. H. Fischer (ECOC, 2017)

Improved Perturbation-Based Fiber Nonlinearity Compensation. - Felix Frey; Robert Emmerich; Colja Schubert; Johannes K. Fischer; Robert F. H. Fischer (ECOC, 2018)

Improving Achievable Information Rates of 64-GBd PDM-64QAM by Nonlinear Transmitter Predistortion. - Robert Elschner; Robert Emmerich; Carsten Schmidt-Langhorst; Felix Frey; Pablo Wilke Berenguer; Johannes K. Fischer; Helmut Grießer; Danish Rafique; Jörg-Peter Elbers; Colja Schubert (OFC, 2018)

On Discrete-Time/Frequency-Periodic End-to-End Fiber-Optical Channel Models. - Felix Frey; Johannes K. Fischer; Robert F. H. Fischer (CoRR, 2019)

Coded Modulation for Four-Dimensional Signal Constellations with Concatenated Non-Binary Forward Error Correction. - Sebastian Stern; Masoud Barakatain; Felix Frey; Johannes Pfeiffer; Johannes K. Fischer; Robert F. H. Fischer (ECOC, 2020)