H. C. Hansen Mulvad

Single- and multi-carrier techniques to build up Tb/s per channel transmission systems

In this paper, we review emerging technologies to build up Tb/s per channel transmission capacity. The different approaches, mainly based on various implementations of orthogonal frequency division multiplexing, Nyquist wavelength division multiplexing and optical time division multiplexing, are introduced and compared with respect to complexity, spectral efficiency and transmission reach. In addition to this analysis, we review recent Tb/s per channel transmission experiments, which have employed at least one of these techniques, and compare them to conventional WDM systems.

Error-free transmission of serial 1.28 Tbaud RZ-DPSK signal

This paper demonstrates the first transmission of a 1.28 Tbaud data signal. The transmission link is a 50-km dispersion managed fibre consisting of super large area fibre and inverse dispersion fibre. Error-free performance (BER<10−9) is achieved after transmission.

640 Gbit/s optical time-division add-drop multiplexing in a non-linear optical loop mirror

Error-free 640 Gbit/s all-optical time-division add-drop multiplexing is demonstrated using a non-linear optical loop mirror. Both the add- and drop operations are achieved simultaneously by switching.

Optical switching and detection of 640 Gbits/s optical time-division multiplexed data packets transmitted over 50 km of fiber

We demonstrate 1×4 optical-packet switching with error-free transmission of 640 Gbits/s single-wavelength optical time-division multiplexed data packets including clock distribution and short pulse generation for optical time demultiplexing based on a cavityless pulse source.

650 Gbit/s OTDM transmission over 80 km SSMF incorporating clock recovery, channel identification and demultiplexing in a polarisation insensitive receiver

Error free low penalty 650 Gbit/s OTDM transmission is demonstrated using a polarisation independent receiver based on FWM for demultiplexing. Spectral shaping in the transmitter and filtering in the receiver are used for clock extraction.

Ultra-high-speed optical signal processing of Tbaud data signals

We describe methods to generate and optically signal process Tbaud serial optical data signals. We present sub-systems making serial optical Tbit/s systems compatible with standard Ethernet data for data centre applications, and present Tbit/s results using a.o. silicon nanowires.

Polarisation-insensitive 640 Gbit/s demultiplexing using a polarisation-maintaining highly non-linear fibre

Polarisation-insensitive 640 Gbit/s demultiplexing is demonstrated using a 100 m polarisation-maintaining highly non-linear fibre. Error-free performance is achieved with only 0.2 dB polarisation dependence.

All-optical OFDM system using a wavelength selective switch based transmitter and a spectral magnification based receiver

We demonstrate an AO-OFDM system with a WSS-based transmitter and time-lens based receiver for spectral magnification, achieving BER~10-9 for a 28×10 Gbit/s DPSK AO-OFDM signal. Furthermore, the receiver performance for DPSK and DQPSK is investigated using Monte Carlo simulations.

Detailed time-resolved spectral analysis of ultra-fast four-wave mixing in silicon nanowires

We present an experimental set-up for measuring spectral and temporal nonlinear responses of silicon nanowires. We find that switching windows are independent of device lengths and there is no memory effect of the FWM response.

Flat-top pulse enabling 640 Gb/s OTDM demultiplexing

In ultra-high speed optical time division multiplexed systems (OTDM) with bit rates of 640 Gb/s at single wavelength and single polarisation, timing jitter is perhaps the most detrimental factor, limiting switching quality. Here, we report on using a novel flat-top pulse shaping technique, which increases the tolerance of a switch to timing jitter, enabling 640 to 10 Gb/s demultiplexing.