A Study of Power Efficiency Maximization in Submarine Cable Systems

Downie, John D.; Liang, Xiaojun

doi:10.1109/jlt.2022.3197953

Cited by 4 publications

(2 citation statements)

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“…We thus define two single fiber power efficiencies as the ratio of the total fiber capacity to the sum of the output powers or pump powers as PE1 and PE2, respectively. We slightly change the definition of PE1 to represent the total added power from amplification [12,28] which does not affect optimal GSNR values but does alter the predicted optimal span loss value as we will see later. The definitions of PE1 and PE2 are ( )…”

Section: Single Fiber Modelsmentioning

confidence: 99%

“…When the GD model is applied in the study of power efficiency, optimal SNR values maximizing PE are different from the first droop model of [14,15]. While first illustrated for the EDFA output power metric [16,20], the GD model has also been applied to study power efficiency using optical pump power consumed in erbium-doped fiber amplifiers (EDFAs) as a closer measure of electrical power [17,24,25,27,28].…”

Section: Introductionmentioning

confidence: 99%

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Power-efficient undersea SDM systems

Downie

2023

Next-Generation Optical Communication: Components, Sub-Systems, and Systems XII

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Undersea submarine cable transmission systems are characterized by fixed and limited electrical power supplies. Electrical power is provided by a DC voltage applied across the cable from power feed equipment (PFE) located at the terminal ends and is used to power all optical amplifiers throughout the entire link which may be many thousands of kilometers. Because of the limited nature of electrical power, the concept of power efficiency is very important. In fact, power efficiency drives the recent design trend in undersea systems to spatial division multiplexing (SDM), increasing fiber counts in submarine cables. We examine here efficiency maximization via system modeling primarily with respect to the optimal generalized signal-to-noise ratio (GSNR). We explore dependences on system aspects such as capacity metric, link length, span loss, and fiber attenuation. We compare three different measures of efficiency based on total amplifier optical output power, total pump power, and overall cable capacity predicted by application of a pump sharing model and the resulting electrical-to-optical conversion efficiency levels predicted. Several capacity metrics are also studied and compared ranging from the theoretical Shannon capacity limit to a fitting of a real-time transponder. We evaluate optimal link GSNR values that maximize the various efficiency definitions as a function of link length, as well as optimal span loss values for a fixed link distance.

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Section: Single Fiber Modelsmentioning

confidence: 99%