Search results for: P. J. Winzer
article
IEEE Photonics Technology Letters > 2017 > 29 > 1 > 154 - 157
As optical-fiber capacity is increased by the use of multiple signal bands such as the combined S+C+L bands, signals in the $S$ -band may have to co-exist with Raman pumps operating in nearby wavelength slots. We investigate the impact of placing a counter-propagating Raman pump near a 32-Gbd polarization-division-multiplexed 16-ary quadrature-amplitude-modulated signal.
chapter
Springer Series in Optical Sciences > Raman Amplifiers for Telecommunications 2 > Systems Design and Experiments > 491-568
Lightwave communication systems carry information that is encoded onto the intensity, phase, or polarization of light from one point to another along an optical path. When designing such systems, many mechanisms that degrade the transfer of information must be taken into account. Until the late 1990s, the main causes of signal degradation in transmission were fiber nonlinearity and amplified spontaneous emission...
chapter
We demonstrate a coherent receiver using a 100-GHz electrical bandwidth and 240-GS/s real-time oscilloscope as analog-to-digital converter in a 160-Gbaud QPSK system.
chapter
We experimentally investigate idealized digital nonlinearity compensation in a 9-channel DWDM system. A Q2-factor gain of 2-dB for single-channel transmission is reduced to 0.1-dB in DWDM operation and recovers to 0.8-dB for nonlinearity compensation across all channels.
article
Journal of Lightwave Technology > 2015 > 33 > 3 > 625 - 630
We report a field demonstration of transmission of 1.44 Tb/s over the Korean Advanced Research Network using three 341-Gb/s PDM-OFDM signals with 256-iterative-polar-modulation. The dispersion managed commercial wavelength-division multiplexed (WDM) transmission system, deployed on legacy fiber and supporting WDM transmission on a 100-GHz grid, covered the distance of 248 km between Daejeon and Seoul...
chapter
We review high-speed experimental coherent transmission systems for bit rates from 400 Gb/s to 1.2 Tb/s, using high-speed electronic multiplexing to symbol rates from 72 GBd to 107 GBd.
article
Journal of Lightwave Technology > 2014 > 32 > 4 > 766 - 775
We present fiber-nonlinearity-tolerant transmission of polarization-division multiplexed binary phase-shift keying (PDM-BPSK) through a nonlinear noise squeezing (NLNS) effect that is achieved by optimized digital electronic dispersion precompensation. With the improved nonlinear tolerance, a 406.6-Gb/s superchannel consisting of eight 37.5-GHz-spaced 32-Gbaud Nyquist-filtered PDM-BPSK signals is...
chapter
We demonstrate DSP-efficient mitigation of intrachannel and interchannel nonlinear impairments in dispersion-managed DWDM transmission by using channelized-FBG-DCMs and dispersion-folded digital-back-propagation, showing similar nonlinearity tolerance as dispersion-unmanaged transmission for 256-Gb/s PDM-16QAM signals over 12×100-km SSMF spans.
chapter
We review the concept, experimental demonstrations, and performance tradeoffs of phase-conjugated twin waves for fiber nonlinearity mitigation. The implications of the underlying physics for perturbation-based fiber nonlinearity compensation are also discussed.
chapter
We present a novel 2-channel arbitrary waveform generator (AWG) prototype, generating complex signal constellations with 6-bit digital-to-analog conversion (DAC) of up to 72 GS/s at a 6-dB bandwidth of 23 GHz. We generate a 55-GBd root-raised cosine shaped single-carrier 64-QAM signal.
chapter
We report on a 1.44-Tb/s field demonstration on the Korean Advanced Research Network (KOREN) using three 341-Gb/s PDM-OFDM signals with 256-iterative-polarmodulation over a 495.2-km commercial field-deployed WDM system.
chapter
We review multiple-input multiple-output space-division multiplexed (MIMO-SDM) system capacities and component characteristics, such as multiplexer crosstalk, mode-dependent loss/gain, distributed mode-dependent noise, and differential modal group delay.
chapter
We review recent experimental demonstrations of high-speed optical transmission systems using digital coherent detection at high, all-electronically multiplexed symbol rates of 80 and 107 GBd to achieve interface rates from 428 Gb/s to 1.28 Tb/s.
chapter
We experimentally demonstrate transmission over a novel multicore fiber with 9 cores arranged in 3 groups of 3 cores, where strong coupling occurs within the groups and weak couplings between groups. We transmitted over 2500 km in a single group at a time and 715 km when all 9 cores are used. Low-loss 3D waveguides are used as couplers.
chapter
We demonstrate the generation of all-electronically multiplexed 107-Gbaud PDM-16QAM and its coherent detection using 72-GHz balanced photodetectors and a 63-GHz real-time oscilloscope.
chapter
We transmit 32 WDM channels over 12 spatial and polarization modes of 177 km few-mode fiber at a record spectral efficiency of 32 bit/s/Hz. The transmitted signals are strongly coupled and recovered using 12×12 multiple-input multiple-output digital signal processing.
chapter
We transmit a 406.6-Gb/s superchannel consisting of eight 37.5-GHz-spaced 32-Gbaud Nyquist-filtered PDM-BPSK signals over 12,800-km (160×80-km) EDFA-only amplified dispersion-unmanaged TWRS fiber. This result is enabled by nonlinear noise squeezing achieved through optimized digital electronic dispersion pre-compensation.
chapter
We demonstrate, using a compact InP-based integrated assembly of a tunable laser and a double-nested Mach-Zehnder modulator, generation of Nyquist-prefiltered QPSK and 16-QAM signals at 32-Gbaud. We transmitted them over 8000-km and 960-km SSMF, respectively.
chapter
We describe a multi-band DFT-spread-OFDM equalizer that combines overlap-and-add dispersion compensation with OFDM demultiplexing for reduced guard interval and lowered DSP complexity, and demonstrate it in the transmission of a 22-Gbaud signal over 6400-km SSMF.
chapter
We transmit 16 WDM channels using 20-Gbd QPSK over 12 spatial and polarization modes of 708-km few-mode fiber at a spectral-efficiency-distance product of 11328 km bit/s/Hz. The transmitted signals are recovered using off-line 12 ×12 multiple-input multiple-output digital signal processing.
