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Maximum Power Transfer01:16

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Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
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The maximum power flow for lossy transmission lines is derived using ABCD parameters in phasor form. These parameters create a matrix relationship between the sending-end and receiving-end voltages and currents, allowing the determination of the receiving-end current. This relationship facilitates calculating the complex power delivered to the receiving end, from which real and reactive power components are derived.
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Lossless Lines01:23

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In electrical engineering, a lossless transmission line is characterized by a purely imaginary propagation constant and a resistive characteristic impedance. The ABCD parameters, which describe the relationship between the input and output voltages and currents, indicate an equivalent π circuit with an imaginary series impedance and a shunt admittance. This results in a transmission line that, when the product of the phase constant (beta) and the length of the line is less than pi, exhibits...
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Quasi-light Storage for Optical Data Packets
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100 Gbps IM/DD links using quad-polarization: Performance, complexity, and power dissipation.

S Saldaña Cercós, M Piels, J Estarán

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    |September 15, 2015
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    Summary

    Quad-polarization digital signal processing (DSP) shows minimal power consumption for short-range direct detection links. Analog-to-digital converters significantly impact overall system power usage.

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    Area of Science:

    • Optical communications
    • Digital signal processing
    • Fiber optic networks

    Background:

    • Short-range direct detection links are crucial for data center interconnects and high-speed networking.
    • Evaluating computational complexity, power consumption, and receiver sensitivity is essential for optimizing link performance.
    • Three distinct link scenarios (quad-polarization, WDM, parallel optics) require comparative analysis.

    Purpose of the Study:

    • To analyze and compare the computational complexity, power consumption, and receiver sensitivity of three short-range direct detection link scenarios.
    • To quantify the power consumption impact of digital signal processing (DSP) in quad-polarization systems.
    • To determine the feasibility of high-speed data transmission over standard single-mode fiber.

    Main Methods:

    • Computational complexity analysis was performed for quad-polarization, WDM, and parallel optics scenarios.
    • Power consumption was measured, with a specific focus on the contribution of analog-to-digital converters (ADCs) in quad-polarization systems.
    • Receiver sensitivity was evaluated for a 4x32 Gbps transmission over 2 km of standard single-mode fiber.

    Main Results:

    • The power consumption penalty from quad-polarization DSP was found to be negligibly small.
    • Analog-to-digital converters constituted 47.6% of the total system power consumption in the analyzed quad-polarization system.
    • A receiver sensitivity of 4.4 dBm was achieved for a 4x32 Gbps transmission over 2 km of standard single-mode fiber.

    Conclusions:

    • Quad-polarization offers a power-efficient solution for short-range optical links when considering DSP overhead.
    • The significant power consumption of ADCs presents a key area for optimization in future direct detection system designs.
    • The study demonstrates the successful implementation of high-speed data transmission, achieving excellent receiver sensitivity.