Abstract

A tutorial on fiber-optic submarine transmission systems is provided. After an introduction to wet plant and cable engineering and giving a perspective on the present and future of this technology, we cover the information theory, signal processing, modeling, and optimization algorithms to architect transoceanic systems.

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In this work nonlinear noise caused by interfering WDM channels is discussed. Two adaptive filter techniques are reviewed, fast LMS and generalized filters. Both their individual and combined performance is shown over trans-oceanic transmission distances.

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We compute the optimized fiber splitting ratio of hybrid spans composed of quasi-single-mode (QSM) fibers and single mode fibers using numerical simulations. We show that the optimum ratio increases with the span length, the fiber effective area, and the residual of multipath interference at receiver.

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A low complexity solution to mitigate chromatic dispersion is proposed for short-reach communications. The technique relies on sharing complexity between optical and electronic domain and shows gains in terms of required receiver SNR for up to 20-km fiber transmission.

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We review parametric techniques for wideband amplification. Dispersion stable highly nonlinear fibers show operation bandwidth up to 50nm thanks to longitudinal dispersion stability and forth order dispersion close to zero. Quasi phase matching brings flat 20 dB gain by only 1 W order pump power.

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This work reports a normal incident high speed photodiode operating at two-micron wavelength with InGaAs/GaAsSb type-II multiple quantum wells absorber. A 3dB bandwidth of 25 GHz can be achieved, which is, in our knowledge, the fastest photodiode at 2-micron wavelength.

Abstract

The imaging technology including materials, detectors, optics and imaging system design have dramatically improved over last decade. In this presentation new directions toward infrared imaging with a future perspective will be discussed.

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Abstract

We proposed and demonstrated a new machine learning algorithm for wavelength modulation spectroscopy to enhance the accuracy of fire detection. The result shows more than 8% of accuracy improvement by analyzing CO/CO₂ 2f signals.

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This paper presents a technique to use deep neural network on data analysis of distributed acoustic sensing (DAS) system built by phase-sensitive optical time-domain reflectometry (Φ-OTDR) with Rayleigh enhancement.

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In this presentation, we will discuss the advantages of using an in-pixel digital read out integrated circuit and resonator pixel technology with the type-II strained layer superlattice detector array to elevate the operating temperature of the focal plane array for Earth remote sensing applications.

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Numerical and experimental data show that few-bit DACs can be used in driver circuits for optical phased arrays. For a 128-element uniform linear array, using only 4 bits is acceptable with little impact on performance. This can lower the system cost of mass-market lidars.