Stabilized Directional Couplers Using Length Extenders
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Solution Overview
Problem
Conventional semiconductor processing techniques face challenges with signal attenuation and crosstalk in copper data channels, which are mitigated with power-intensive and complex methods offering limited scalability, while optical communication systems are sought to overcome these limitations.
Innovation Solution
A system and method for stabilized directional couplers are introduced, utilizing waveguides with reduced spacing and length extenders to achieve phase delay, integrated into a CMOS chip, enabling efficient optical signal communication with reduced variability in coupling ratios through Monte Carlo simulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional copper data channels are used, then signal transmission is achieved, but signal attenuation and crosstalk occur
Solution Approach 1:
The patent replaces copper-based electrical signal transmission with optical signal transmission through waveguides. This substitution eliminates signal attenuation and crosstalk inherent in copper channels by using light-based evanescent coupling mechanisms, thereby resolving the technical contradiction between achieving reliable signal transmission and avoiding harmful signal degradation.
2Reliability
If equalization and coding are applied to mitigate signal attenuation, then signal transmission quality improves, but power consumption and system complexity increase
Solution Approach 1:
By substituting electrical signal transmission with optical transmission through waveguides, the patent fundamentally eliminates the need for complex equalization and coding mechanisms. The optical waveguide system inherently avoids signal attenuation and crosstalk, thereby resolving the contradiction between improving signal quality and reducing system complexity.
3Reliability
If shielding is applied to reduce crosstalk, then signal transmission quality improves, but cable bulk and power requirements increase
Solution Approach 1:
The patent replaces copper cable-based transmission with integrated optical waveguide transmission. This substitution eliminates the need for bulky shielding structures while achieving superior signal isolation through evanescent coupling mechanisms, thereby resolving the contradiction between improving signal quality and reducing cable bulk.
4Productivity
If waveguide spacing is reduced to improve coupling efficiency, then directional coupler performance improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs parameter changes through the use of length extenders that introduce controlled phase delays. By adjusting the length of waveguide sections and the positioning of directional couplers, the system optimizes coupling efficiency while compensating for manufacturing variations. This approach resolves the contradiction between achieving high coupling efficiency and maintaining manufacturing precision.
5Productivity
If directional couplers are used for optical signal splitting, then signal distribution is achieved, but output power variability occurs
Solution Approach 1:
The patent introduces length extenders that provide controlled phase delays to compensate for power variations. By carefully designing the length of waveguide sections and the positioning of directional couplers, the system achieves stable output power across multiple channels. This resolves the contradiction between achieving signal distribution capability and maintaining output power stability.
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 solution significantly reduces signal variability and power penalties in directional couplers, enhancing scalability and performance by stabilizing light output levels across wafer lots, as demonstrated by experimental results.
Implementation Method 1
at least a portion of the input optical signal is coupled between the first and second waveguides in the first directional coupler and at least a portion of the coupled optical signal is coupled between the first and second waveguides in the second directional coupler
Implementation Method 2
The length extender may add phase delay for signals in one of the first and second waveguides
Data Source
AI summary
Methods and systems for stabilized directional couplers are disclosed and may include a system comprising first and second directional couplers formed by first and second waveguides, where one of the waveguides may comprise a length extender between the directional couplers. The directional couplers may be formed by reduced spacing between the waveguides on opposite sides of the length extender. An input optical signal may be communicated into one of the waveguides, where at least a portion of the input optical signal may be coupled between the waveguides in the first directional coupler and at least a portion of the coupled optical signal may be coupled between the waveguides in the second directional coupler. Optical signals may be communicated out of the system with magnitudes at a desired percentage of the input optical signal. The length extender may add phase delay for signals in one of the first and second waveguides.