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This survey paper presents some of the applications where the versatile time-lens concept successfully can be applied to ultra-high-speed serial systems by offering expected needed functionalities for future optical communication networks.
We experimentally demonstrate the compression of a dense wavelength-division multiplexing (DWDM) grid via a spectral imaging system based on two time-lenses. A 100-GHz DWDM-grid is compressed to 50-GHz with error-free performance for all channels.
We propose spectral magnification of optical-OFDM super-channels using time-lenses, enabling reduced inter-carrier-interference in subcarrier detection by simple band-pass filtering. A demonstration on an emulated 100 Gbit/s DPSK optical-OFDM channel shows improved sensitivities after 4-times spectral magnification.
We demonstrate optical wavelength preserving serial-to-parallel conversion. 9-of-16 OTDM channels are simultaneously mapped from a 160 Gbit/s signal to a 100 GHz WDM grid by wavelength preserving FWM idler generation, with BER<;1E-9 performance.
We have generated a phase-correlated 160 GBaud NRZ-like DPSK signal based on XPM in a HNLF. The generated 160 GBaud DPSK signal is Nyquist filtered with minimized ISI and error-free performance is achieved.
Phase-sensitive processes exploiting FWM in an HNLF allow simultaneously converting two orthogonal quadratures of an optical signal to different wavelengths. Conversion efficiencies to two 90°-phase-shifted idlers exceeding 10 dB of phase-sensitive extinction ratio are obtained experimentally.
We demonstrate simultaneous regeneration of 4×160-Gbit/s signals in a HNLF. The receiver powers at the BER of 10-9 are improved by 1.9 dB, 1.8 dB, 1.6 dB and 1.5 dB for the four channels, respectively.
320 Gb/s Nyquist-OTDM is generated by rectangular filtering with a bandwidth of 320 GHz and received by polarization-insensitive time-domain optical Fourier transformation (TD-OFT) followed by passive filtering. After the time-to-frequency mapping in the TD-OFT, the Nyquist-OTDM is converted into a waveform similar to an OFDM signal.
We present a numerical bit-error rate investigation of 160–640 Gbit/s serial-to-parallel conversion by four-wave mixing based time-domain optical Fourier transformation, showing an inverse scaling of the required pump energy per bit with the bit rate.
All-optical 2R regeneration of a 160-Gbit/s RZ-OOK signal is demonstrated in a fiber optical parametric amplifier using a highly nonlinear fiber with the data as pump. Bit error rate bathtub curves validate the regeneration performance.
To ensure that ultra-high-speed serial data signals can be utilised in future optical communication networks, it is indispensable to have all-optical signal processing elements at our disposal. In this paper, the most recent advances in our use of non-linear materials incorporated in different function blocks for high-speed signal processing are reviewed.
We review recent advances in the optical signal processing of ultra-high-speed serial data signals up to 1.28 Tbit/s, with focus on applications of time-domain optical Fourier transformation. Experimental methods for the generation of symbol rates up to 1.28 Tbaud are also described.
We demonstrate the utilization of the optical Fourier transform technique for serial-to-parallel conversion of 64×10-GBd OTDM data tributaries with complex modulation formats into 50-GHz DWDM grid without loss of phase and amplitude information.
We describe recent demonstrations of exploiting highly nonlinear silicon waveguides for ultrafast optical signal processing. We describe wavelength conversion and serial-to-parallel conversion of 640 Gbit/s data signals and 1.28 Tbit/s demultiplexing and all-optical sampling.
We demonstrate a field trial of a 640-Gbaud NRZ signal generated by RZ-to-NRZ conversion of a phase-coherent RZ-OTDM signal. This is employed in a 1.19-Tbit/s PDM-NRZ-OOK field transmission with BER< 3.8×10−3 for all 128 tributaries.
Applications of time-domain optical Fourier transformation (OFT) in ultra-high-speed optical time-division multiplexed systems (OTDM) are reviewed, with emphasis on the recent demonstrations of OFT-based conversion between the OTDM and DWDM formats.
We describe recent demonstrations of exploiting highly nonlinear silicon nanowires for processing Tbit/s optical data signals. We perform demultiplexing and optical waveform sampling of 1.28 Tbit/s and wavelength conversion of 640 Gbit/s data signals.
A time lens system synchronizes a 10G Ethernet asynchronous data frame to a local master clock and converts the NRZ-frame to an RZ-frame and multiplexes it into a 330 Gbit/s aggregated Optical TDM signal.
We propose a scheme enabling direct serial-to-parallel conversion of OTDM data tributaries onto a WDM grid, based on optical Fourier transformation with spectral compression. Demonstrations on 320 Gbit/s and 640 Gbit/s OTDM data are shown.
We present a serial 10.2-Tb/s transmission-system using a 1.28-TBd RZ-16-QAM signal, polarization multiplexing and ultra-fast coherent demultiplexing. Considering FEC-overhead, we achieve a record error-free net data rate of 9.5-Tb/s and transmission over 29-km.
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