Colja Schubert

TL;DR: In this article, a segmented Mach-Zehnder modulator is proposed for frequency equalization and narrow spectral shaping without the need of any high-resolution digital-to-analog converter and digital signal processing on the transmitter side.

TL;DR: In this paper, the authors experimentally generate 28GBd 6PolSK-QPSK signals by utilizing a high-speed 4-channel DAC and an integrated dual-polarization I/Q modulator.

TL;DR: In this article, a subcarrier polarization manipulation using two orthogonally polarized local subcarriers signals is presented, where the angle of a 25-Gb/s QPSK sub-carrier can be arbitrarily controlled between orthogonal states without affecting 25GHz spaced adjacent subcriers.

TL;DR: In this article, a concept for optical frequency rearrangement using frequency conversion is presented which is expected to increase the flexibility of optical path and spectral usage in optical nodes, and experiments of coherent optical subcarrier processing and optical frequency shifter achieved by using highly nonlinear fiber.

TL;DR: The demultiplexing of 8×13.4 Gbaud OFDM-QPSK subcarriers using a silicon nanophotonic-based discrete Fourier transform (DFT) filter shows less than 1.5 dB OSNR penalty compared to the theoretical limit.