Berthold Lankl

High spectral efficiency 1.6-b/s/Hz transmission (8 x 40 Gb/s with a 25-GHz grid) over 200-km SSMF using RZ-DQPSK and polarization multiplexing

With relatively simple standard transmission equipment, we achieved a wavelength-division-multiplexing transmission with a record-high spectral efficiency of 1.6 b/s/Hz using return-to-zero differential quadrature phase-shift keying and polarization multiplexing over 200-km standard single-mode fiber with a 40-Gb/s capacity per wavelength but 10-GSymbol/s rate.

41.6 Tbit/s C-Band SDM OFDM Transmission Through 12 Spatial and Polarization Modes Over 74.17 km Few Mode Fiber

Signal transmission with capacity of 41.6 Tbit/s (net data rate 16.8 Tbit/s) over 12 spatial and polarization modes is demonstrated. Dense optical orthogonal frequency division multiplexing signals with a channel spacing of 16.7 GHz across the full C band is generated. The resulting 12 tributaries are (de-)multiplexed using a novel fully packaged photonic lantern based 3-D-waveguide spatial-multiplexer. The spatially multiplexed signals are transmitted over 74.17-km weakly coupled six-mode few mode fiber enabling inline differential mode delay compensation. All 12 tributaries are detected using three oscilloscopes via coherent heterodyne receiver. The bit error rate of the 255 channel in each mode is evaluated to be below the forward error correction limit 2.4 × 10-2 assuming 20% overhead.

Iterative Electronic Equalization Utilizing Low Complexity MLSEs for 40 Gbit/s DQPSK Modulation

We present simulations of a novel electronic signal processing technique that allows digital equalization of optical 40 Gbit/s DQPSK signals using iterative equlization with mutual exchange of information between low complexity MLSEs.

41.6 Tb/s C-band SDM OFDM transmission through 12 spatial and polarization modes over 74.17 km few mode fiber

We demonstrate the transmission of 12 spatial and polarization modes multiplexed on 255 optical channels in ultra-dense WDM using OFDM across the full C-band over 74.17 km 6-mode fiber. An aggregate bit rate of 41.6 Tbit/s is achieved.

Optimal Symbol Rate for Optical Transmission Systems with Coherent Receivers

We investigate the nonlinear impairments for future 1Tbit/s transmission in multi-band systems with coherent reception. The optimal baud rate for the sub-band is derived for higher-order QAM and varying dispersion management.