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Boundary Conditions: Lossless Lines

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Consider a single-phase, two-wire, lossless transmission line terminated by an impedance at the receiving end and a source with Thevenin voltage and impedance at the sending end. The line, with length, has a surge impedance and wave velocity determined by the line's inductance and capacitance.
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The provided content explores the behavior of traveling waves on single-phase lossless transmission lines. It begins with a single-phase two-wire lossless transmission line of length Δx, characterized by a loop inductance LH/m and a line-to-line capacitance C F/m. These parameters result in a series inductance LΔx and a shunt capacitance CΔx.

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The Bewley lattice diagram, developed by L. V. Bewley, effectively organizes the reflections occurring during transmission-line transients. It visually represents how voltage waves propagate and reflect within a transmission line, making it easier to understand the complex interactions that occur.

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Related Experiment Video

Updated: May 13, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

Loss analysis for a two wire optical waveguide for chip-to-chip communication.

Jonathan Dickason¹, K W Goossen

¹Department of Electrical Engineering, University of Delaware, 140 Evans Hall, Newark, DE 19716, USA. jond@udel.edu

|March 14, 2013

Summary

This study introduces an optical interconnect system using gold bond wires as waveguides for chip-to-chip communication. The proposed system achieves low transmission loss, enabling simpler and efficient optical data transfer between integrated circuits.

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Area of Science:

Photonics and Optical Engineering
Materials Science for Electronics
Integrated Circuit Interconnects

Background:

Traditional chip-to-chip communication faces limitations in speed and bandwidth.
Existing optical interconnects often require complex fabrication and integration processes.
Developing cost-effective and simplified optical communication solutions is crucial for advanced electronics.

Purpose of the Study:

To propose and evaluate a novel optical interconnect system for chip-to-chip communication.
To investigate the feasibility of using standard gold bond wires as optical waveguides.
To determine the transmission loss characteristics of such a two-wire waveguide system.

Main Methods:

Simulating and measuring optical transmission loss in gold bond wires.
Analyzing the impact of wire size and configuration on waveguide performance.
Utilizing near-infrared wavelengths for optical signal propagation.

Main Results:

Transmission loss coefficients below 0.4 mm⁻¹ (1.7 dB/mm) were achieved.
Demonstrated the viability of gold bond wires as effective optical waveguides.
Identified optimal wire configurations for minimizing signal attenuation.

Conclusions:

Gold bond wires can serve as efficient waveguides for chip-to-chip optical interconnects.
The proposed system offers a simplified and potentially lower-cost alternative to existing optical waveguide concepts.
This approach facilitates practical optical communication between integrated circuits, enhancing data transfer capabilities.