Buried Oxide Layer Optical Waveguide for Signal Delay Reduction
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Solution Overview
Problem
As integrated circuits become increasingly complex, long and complicated multilevel interconnects lead to unpredictable signal propagation delays, impacting device speed and performance, and existing low-k Inter-Layer Dielectric materials are difficult and costly to apply.
Innovation Solution
A semiconductor optical waveguide device is introduced, featuring a buried oxide layer and Silicon On Insulator (SOI) substrate, with a light-conductive core insulating layer surrounded by clad layers and etched holes for light transmission, utilizing refractive indices to trap and guide light along a desired path, reducing propagation delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional electrical interconnects are used in integrated circuits, then device complexity increases with more circuits packed into smaller spaces, but signal propagation delay increases and device speed deteriorates
Solution Approach 1:
The patent replaces electrical signal transmission through metal interconnects with optical signal transmission through waveguide structures formed by buried oxide layers. This substitution of transmission medium (from electrical to optical) enables faster signal propagation and reduces delays in complex multilevel interconnect architectures
Solution Approach 2:
The patent changes the fundamental parameter of signal transmission from electrical to optical domain. By utilizing optical waves instead of electrical signals, the propagation speed increases and delay is reduced, directly addressing the speed-performance bottleneck in complex integrated circuits
2Productivity
If low-k Inter-Layer Dielectric materials are used to preserve device speed, then device speed and performance may be maintained, but manufacturing difficulty and cost increase
Solution Approach 1:
Instead of relying on low-k dielectric materials to maintain signal integrity and speed, the patent substitutes optical waveguide transmission for electrical interconnect transmission. This eliminates the need for complex low-k material deposition processes while achieving similar or superior speed performance
Solution Approach 2:
The buried oxide layers, which are already present in standard SOI semiconductor substrates for electrical isolation, are repurposed to serve dual functions: electrical isolation and optical waveguide transmission. This self-service approach eliminates the need for additional specialized materials or processes
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The semiconductor optical waveguide device optimizes signal propagation time and enhances the speed and performance of semiconductor devices by effectively guiding light signals through the use of refractive index differences between core and clad layers, reducing complexity and delay in interconnects.
Implementation Method 1
Light transmitted in the etched hole may contact the prism at a first angle and be refracted into the prism at a second angle. The refraction or reflection of light in the core insulating layer may be based on relative values for the indices of refraction of the core insulating layer, clad insulating layer, prism or etched hole
Implementation Method 2
The optical wave guide may guide light transmission along a desired path. The core region may be characterized by an index of refraction of light and may be surrounded by cladding material. The index of refraction of the core and the index of refraction of the surrounding clad may be determined so as to substantially or fully trap light within the core
Data Source
AI summary
A semiconductor optical wave guide device is described in which a buried oxide layer (BOX) is capable of guiding light. Optical signals may be transmitted from one part of the semiconductor device to another, or with a point external to the semiconductor device, via the wave guide. In one example, an optical wave guide is provided including a core insulating layer encompassed by a clad insulating layer. The semiconductor device may contain an etched hole for guiding light to and from the core insulating layer from a transmitter or to a receiver.