Optical Receiver Wiring Layout for Crosstalk Noise Isolation
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Solution Overview
Problem
In optical receiver modules, electric crosstalk between adjacent light-receiving elements and wires leads to deteriorated high-frequency characteristics due to the use of materials with higher dielectric constants, causing noise interference.
Innovation Solution
The optical receiver module incorporates a wiring pattern with high resistance portions overlying light-receiving elements and low resistance portions elsewhere, effectively absorbing crosstalk noise by strategically placing high resistance materials like Ni-Cr compounds near the light-receiving elements and using lower resistance materials like Au for other connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If light-receiving elements are adjacently arranged to downsize the optical receiver module, then the module size is reduced, but electric crosstalk between adjacent elements and wires increases
Solution Approach 1:
The patent applies local quality by making the second wiring line have different resistance characteristics at different locations: high resistance in portions overlapping with light-receiving elements to reduce crosstalk, and low resistance in other portions to maintain signal transmission quality. This localized variation in electrical properties resolves the contradiction between compact arrangement and crosstalk reduction.
Solution Approach 2:
The patent changes the electrical resistance parameter of the second wiring line along its length, transitioning from high resistance near the light-receiving elements to low resistance in other sections. This parameter variation allows the wiring to simultaneously reduce crosstalk interference while maintaining effective signal transmission to the integrated circuit.
2Reliability
If light-receiving elements are made electrically independent, then signal quality is maintained, but the wiring structure becomes more complex
Solution Approach 1:
The patent achieves electrical independence for each light-receiving element through the carrier's wiring pattern, where each element has its own dedicated first and second wiring lines. The second wiring line's differentiated resistance structure provides isolation while maintaining simplicity in the overall wiring architecture.
3Object-affected harmful factors
If high resistance material is used in the second wiring line over light-receiving elements, then crosstalk noise is reduced, but signal transmission efficiency decreases
Solution Approach 1:
The patent applies local quality by restricting high resistance material usage only to specific portions of the second wiring line that overlap with light-receiving elements, while other portions use low resistance material for efficient signal transmission. This localized approach reduces crosstalk without significantly impacting overall signal transmission efficiency.
Solution Approach 2:
The patent changes the resistance parameter of the second wiring line along its length, using high resistance only where needed for crosstalk reduction and low resistance where signal transmission efficiency is critical. This spatial variation in resistance parameters optimizes both noise reduction and signal transmission.
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 configuration significantly reduces crosstalk noise, maintaining the quality of electric signals and improving high-frequency characteristics by isolating noise sources near the light-receiving elements.
Implementation Method 1
the second wiring line has a high resistance portion having a higher resistance value than the other portions at least in a position overlapping with the light-receiving element to be connected
Data Source
AI summary
An optical receiver module includes light-receiving elements each having a first electrode and a second electrode to which a bias is applied, and converting input optical signals into electric signals and outputting the electric signals from the first electrodes, and a carrier having wiring patterns respectively electrically connecting to the light-receiving elements and supporting the light-receiving elements. The wiring pattern includes a first wiring line electrically connecting to the first electrode and a second wiring line electrically connecting to the second electrode. The second wiring line has a high resistance portion having a higher resistance value than the other portions at least in a position overlapping with the light-receiving element to be connected and a low resistance portion having a lower resistance value than the high resistance portion at least in a position not overlapping with any of the light-receiving elements.