Optical Fiber-to-Chip Interconnection Using Circular Polarization
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Solution Overview
Problem
The increasing input/output capacities of electronic processing chips require more efficient interconnection methods beyond electrical signals, as traditional electrical connections are limited by the size of the chip package, necessitating the use of optical signals for higher capacity per unit area.
Innovation Solution
An optical system utilizing circular-polarization-maintaining fibers and quarter-wave plates to convert linearly polarized light into circularly polarized light, which is then propagated through polarization-maintaining fibers and split for optical modulation, enabling efficient optical coupling between devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electrical signals are used for interconnection, then the chip package size can be kept compact, but the I/O capacity is insufficient for increasing processing demands
Solution Approach 1:
The patent replaces electrical signal transmission with optical signal transmission using optical fibers. This substitution enables significantly higher I/O capacity per unit area by using light instead of electrical signals, directly resolving the contradiction between limited electrical I/O capacity and the need for increased productivity in chip interconnections
2Productivity
If optical signals are used to increase I/O capacity, then higher capacity per unit area is achieved, but the system complexity increases due to polarization management requirements
Solution Approach 1:
The patent applies preliminary action by pre-converting linearly polarized light from lasers into circularly polarized light using quarter-wave plates before the light enters the optical fiber. This preliminary conversion simplifies subsequent polarization management in the system, as circularly polarized light maintains its polarization state more reliably through the fiber, reducing the complexity of polarization control mechanisms needed elsewhere in the system
Solution Approach 2:
The patent introduces circularly polarized light as an intermediary state between the linearly polarized light source and the optical fiber transmission medium. This intermediary polarization state acts as a buffer that simplifies the interaction between the light source and the fiber, reducing the overall system complexity by eliminating the need for complex polarization-maintaining fibers or active polarization control mechanisms
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
This solution enhances the interconnection capacity and efficiency by leveraging the higher capacity of optical signals, addressing the limitations of electrical connections and supporting advanced data processing requirements.
Implementation Method 1
a quarter-wave plate to convert the linearly polarized optical power supply light to circularly polarized optical power supply light
Implementation Method 2
a circular-polarization-maintaining fiber configured to propagate the circularly polarized optical power supply light
Implementation Method 3
a polarization beam splitter configured to split the circularly polarized optical power supply light to generate first power supply light having a first polarization and second power supply light having a second polarization
Implementation Method 4
a first linear-polarization-maintaining fiber optically coupled to a first port of the polarization beam splitter to receive the first power supply light
Data Source
AI summary
An apparatus includes a fiber-optic connector configured to be connected between one or more optical fibers having fiber cores and a photonic integrated circuit (PIC) including vertical-coupling elements. The fiber-optic connector includes a polarization beam splitter and a patterned birefringent plate. The polarization beam splitter splits an incident light beam from a fiber core into first and second beams having first and second polarizations, respectively. The patterned birefringent plate includes a first region (having a first optical birefringence) and a second region (having a second optical birefringence). The difference in the first and second optical birefringence is caused by (i) applying localized heating to the first region without applying localized heating to the second region to cause the first region to have a lower birefringence as compared to the second region, or (ii) applying different amounts of localized heating to the first and second regions to produce different birefringence.