We demonstrate 1-Tbit/s dual-carrier dual-polarization 64QAM transmission at 64Gbaud over 320km of standard single-mode fiber with EDFAs only. Error free performance is validated by sFEC decoding of the received data after fiber transmission.

Non-linear tolerance measurements of DP-16QAM (28 Gbd) signals with transmitter based digital signal pre-distortion are reported, showing systematic performance gains of fibre launch power versus pre-distortion (~1.5 dB for 6 uncompensated SMF spans) and a distinct reduction of the non-linear threshold spans scaling factor.

A 16x112 Gb/s field transmission trial was successfully performed over legacy fiber infrastructure of Deutsche Telekom comprising partially high polarization mode dispersion (PMD) values of 8 ps. Using a commercial PMD compensator, transmission over high PMD with negligible penalty was achieved. Enabled by the maturity of 43 Gb/s components, a 112 Gb/s nonreturn to zero (NRZ) differential quadrature phase-shift keying modulation format for dense wavelength division multiplexing transmissions with good system margins of 5 dB over 450 km metro distances (3 dB over 764 km) was demonstrated. By using high baud rate of 56 Gbd, penalty-free transmission is performed when copropagating with either 10.7 Gb/s NRZ or 43 Gb/s phase-shaped binary transmission signal channels.

A 16x112 Gb/s field trial with EDFA only was performed over legacy fiber infrastructure partially with high PMD. Based on 43 Gb/s components we demonstrate by use of 112 Gb/s NRZ-DQPSK modulation format Metro DWDM transmission with carrier-grade margins of more than 4 dB over ultimate Metro distances.

A 16×112Gb/s field trial was performed at the Deutsche Telekom fiber infrastructure with partially high PMD. Using 56Gbaud NRZ-DQPSK, no penalty could be observed when co-propagating with a 10.7Gb/s NRZ. Robust Metro DWDM transmission with attractive carrier-grade margins is demonstrated.

We demonstrate NRZ-VSB modulation at 53.5 Gbit/s applying a dual-drive Mach-Zehnder modulator and compare transmission performance of our VSB-modulated signal with VSB-filtered signals applying electronic dispersion compensation at the receiver.

8 times 107 Gbit/s DWDM transmission is achieved over a 500 km field installed fibre link in the Deutsche Telekom network, indicating high link utilization of 1 bit/s/Hz spectral efficiency, needed for Terabit/s network capacity, required in a mid-term timeframe.

We present the results of an 8x107 Gbit/s ASK-NRZ-VSB DWDM field transmission trial in the fiber network of Deutsche Telekom. The 8x107 Gbit/s DWDM signal was generated by two Mach-Zehnder modulators each modulating a group of four wavelength on a 200 GHz grid for decorrelation of the neighbouring DWDM channels. Both wavelength channel groups are combined by a 100 GHz interleaver, which additionally converts the NRZ signals by vestigial-side-band (VSB) filtering to NRZ-VSB signals with 1 bit/s/Hz spectral efficiency. The transmission link consisted of 6 spans of standard single-mode fiber with an overall link length of 500 km. Pure EDF-amplification was used to compensate for the fiber loss. The link included two spans with high attenuation (~29 dB) and two spans with high PMD resulting in an overall link PMD of ~8 ps. Within the wavelength band covered by the DWDM channels the DGD was in the range of 3 to 15 ps, which corresponds up to the 1.6-fold of the bitperiode of the 107 Gbit/s OOK signal. Therefore application of a optical PMD compensation was mandatory for the transmission trial. After DWDM demultiplexing and direct detection of the 107 Gbit/s data signal in the ETDM receiver the BER of all tributaries of all DWDM channels was measured. We measured an average BER of 7x10(exp -4) and achieved stable operation .

We report on serial 107 Gbit/s (2x53.5 Gbit/s NRZ-VSB-Polmux) transmission over ~15 km SSMF applying only electronic dispersion compensation with a linear equalizer.

We report on the tolerances of a 107 Gbit/s ETDM ASK-NRZ VSB DWDM transmission system with respect to laser detuning, receiver filter detuning, DGD, residual chromatic dispersion and nonlinear transmission impairments.

We demonstrate error free 80x107Gbit/s DWDM ASK-NRZ VSB transmission over 510km NZDSF with spectral efficiency of 1bit/s/Hz. Q-factor margin of 2.5dB over C/L-band and 70% increased dispersion tolerance compared to conventional NRZ is achieved.

We report on a complete serial 107 Gbit/s ETDM NRZ transmission system and assess system performance in an error free transmission experiment over 320 km SSMF with 3.5 dB OSNR margin.

This paper reviews the current status in ultra-high speed electronics and optoelectronic components and reports on the recent progress in serial ETDM transmission technologies at channel- bitrates of 85...107 Gbit/s. The challenges associated with 100 Gbit/s ETDM transmission and subsystems implementation are addressed.

We report on 10x107 Gbit/s serial ETDM DWDM transmission lab system with 200 GHz channel spacing and decorrelated DWDM channels. System performance is assessed in an error free transmission experiment over 480 km SSMF.

We demonstrate error free 8x107 Gbit/s DWDM serial binary NRZ VSB transmission over 480 km SSMF without using an optical equalizer. A spectral efficiency of 1bit/s/Hz is achieved.

We demonstrate error free 85.4 Gbit/s ETDM VSB transmission over 2 km without dispersion compensation and optical amplification. At the receiver we use a photodiode with integrated TIA for reception.

We demonstrate a 100 Gbit/s ETDM transmission system with pure electronic signal processing in transmitter and receiver showing error free operation without using OTDM subsystems.