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We demonstrate in-line nonlinearity compensation (NLC) of a 5-channel dual-polarization 16-QAM signal using opto-electronic sub-systems called total intensity-directed phase modulators (TID-PMs). NLC using a TID-PM placed before each span in an 800 km link improves the signal quality, Q, of the center channel by 0.4 dB at the optimum launch power.
A computationally efficient IFFT implementation for asymmetrically clipped optical OFDM transmitter is proposed and implemented in a Field-Programmable Gate Array. The overall computational complexity is reduced by 68% in a real-time transmitter.
We experimentally demonstrate, for the first time, cross-phase modulation (XPM) compensation using an optical phase modulator and low-bandwidth electronics. We first show that our nonlinearity compensator suppresses the XPM distortion from a 10-Gb/s ON-OFF keyed (OOK) channel on a continuous-wave (CW) probe signal. We then replace the CW tone with a 28-Gbaud quadrature phase-shift keyed (QPSK) signal...
We experimentally demonstrate optical generation of a super-channel of 7 × 12.5 Gbaud QPSK-modulated subcarriers at Nyquist spacing, using a flat-top interleaver. The interleaver comprises a two-ring-resonator-assisted Mach-Zehnder interferometer with only an 8% excess bandwidth at 25-dB stopband suppression.
We propose an optoelectronic method for distributed compensation of XPM based on power-dependent phase rotation. Simulations show 2.7-dB improvement in peak Q for a 28-Gbaud QPSK channel with 14-Gbit/s NRZ-OOK neighbors after 3200-km transmission.
Stimulation of neural tissue for the remediation of brain and sensory deficits requires that stimulation paradigms are selected carefully to deliver the most stable, efficient and safest stimulation to evoke the desired therapeutic response. Here we asked two questions of a penetrating cortical prosthesis use to evoke sensory-guided behavior: 1) does the threshold charge required to evoke a behavioral...
We investigate the relationship between matched filtering and blind equalization for a Nyquist-WDM system. With a Nyquist PDM-16QAM experiment, we show that frequency domain blind equalization leads to a computational efficient adaptive equalizer design.
Simulations of a four-channel AWGR FFT show the mean signal quality is the inverse of the phase variance of the arrayed waveguides. The phase error should < 15º for an 84% device yield.
We experimentally demonstrate that pilot-based nonlinearity compensation is effective for mitigating XPM for CO-OFDM systems. In a 400-km periodic dispersion map, the nonlinearity limit was increased by 5 dB if used together with SPM compensation.
This paper introduces subcarrier pairing to optical OFDM systems and shows, using simulations, that the OSNR sensitivity of DDO-OFDM systems can be improved by 0.7 dB using only simple computations.
We demonstrated experimentally that computationally-efficient digital nonlinearity compensation using backpropagation can increase the nonlinear tolerance of 61.7 Gb/s PDM-CO-OFDM by 2.2 dB in a 500 km link using only 3 backpropagation steps.
We propose a simple optoelectronic method to compensate for cross-phase modulation in long-haul systems. Simulations show >1.3 dB improvement in Q for 1200-km 40 and 100-Gbit/s CO-QPSK and CO-OFDM channels with 10-Gbit/s NRZ neighbors.
In this paper, we consider the optical power level for developing a full constrained search algorithm to find the optimal cost allocation of a chain of amplifiers. We show how the algorithm is improved when different solutions provide the same power level at each span.
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