Low-Voltage Silicon Optical Modulator with L-Shaped Phase Shifters
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional copper data channels face signal attenuation and crosstalk due to radiated electromagnetic energy, which are difficult to mitigate effectively with existing techniques, limiting scalability and requiring significant power and complexity.
Innovation Solution
A low-voltage integrated silicon high-speed modulator system using optical phase shifters with a p-n junction design, comprising horizontal and vertical sections forming an 'L' shape, integrated in a CMOS chip, to modulate optical signals and improve modal overlap and phase shift efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If copper data channels are used to meet bandwidth requirements, then data transmission capability is improved, but signal attenuation and crosstalk increase due to radiated electromagnetic energy
Solution Approach 1:
The patent replaces copper electrical data channels with optical communication channels. Instead of transmitting electrical signals through copper conductors that suffer from electromagnetic radiation, attenuation, and crosstalk, the system uses optical signals transmitted through optical waveguides or fibers, eliminating the electromagnetic interference problems inherent in copper-based systems.
Solution Approach 2:
The patent changes the fundamental transmission medium parameter from electrical conductors (copper) to optical waveguides. This parameter change transitions the system from electrical signal transmission to optical signal transmission, fundamentally altering how data is carried and eliminating the electromagnetic radiation issues that plague copper channels.
2Reliability
If equalization, coding, and shielding techniques are applied to copper channels, then signal quality is improved, but power consumption and system complexity increase significantly
Solution Approach 1:
Instead of applying complex electrical signal processing techniques (equalization, coding, shielding) to mitigate copper channel defects, the patent substitutes the entire copper electrical channel with an optical channel. This eliminates the need for these complex mitigation techniques because optical channels inherently avoid electromagnetic radiation and associated interference problems.
3Ease of operation
If conventional p-n junction phase shifters are used, then optical phase modulation is achieved, but modal overlap and phase shift efficiency are limited
Solution Approach 1:
The patent transitions from conventional planar (2D) p-n junction phase shifters to a three-dimensional (3D) vertically coupled waveguide structure. By stacking waveguides vertically and using evanescent field coupling between them, the design achieves superior modal overlap and phase shift efficiency compared to traditional planar configurations, effectively adding a vertical dimension to the phase modulation mechanism.
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 system achieves improved optical modulation amplitude and bit error rate performance by enhancing modal overlap and phase shift efficiency, overcoming the limitations of conventional copper data channels.
Implementation Method 1
A phase of at least one optical signal in the first and second waveguides may be modulated utilizing the optical phase shifters
Data Source
AI summary
Methods and systems for a low-voltage integrated silicon high-speed modulator may include an optical modulator comprising first and second optical waveguides and two optical phase shifters, where each of the two optical phase shifters may comprise a p-n junction with a horizontal section and a vertical section and an optical signal is communicated to the first optical waveguide. A portion of the optical signal may then be coupled to the second optical waveguide. A phase of at least one optical signal in the waveguides may be modulated utilizing the optical phase shifters. A portion of the phase modulated optical signals may be coupled between the two waveguides, thereby generating two output signals from the modulator. A modulating signal may be applied to the phase shifters which may include a reverse bias.