Optical Module Cross-Talk Reduction via Vertical Terminal Separation
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Solution Overview
Problem
Optical modules with integrated transmission and reception functions experience significant cross-talk noise due to the close arrangement of high-speed signal wiring, which affects the reception of electrical signals, especially when the power of transmission electrical signals is much higher than that of reception signals.
Innovation Solution
The optical module design includes a flexible substrate with signal and ground electrodes that separate the input and output terminals at different heights, reducing cross-talk by spatially separating the wiring for transmission and reception signals, and using a package configuration that positions the transmitting chip closer to the input leads and the receiving chip closer to the output leads to minimize signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If terminals and wiring for transmission electrical signals are arranged close to those for reception electrical signals to downsize the optical module, then the optical module achieves compact size, but cross talk noise increases significantly affecting reception signal quality
Solution Approach 1:
The patent applies three-dimensional spatial separation by arranging transmission and reception terminals at different heights (different Z-axis positions) on the substrate. Transmission terminals are positioned at a first height while reception terminals are positioned at a second height, creating vertical separation that reduces electromagnetic coupling and cross talk noise while maintaining compact horizontal footprint.
Solution Approach 2:
The patent segments the terminal arrangement into distinct transmission and reception zones positioned at different heights. This segmentation separates the high-power transmission signals from sensitive reception signals into different spatial layers, reducing interference while allowing both functions to coexist in a compact integrated module.
2Productivity
If high-speed signal wiring is arranged closely to integrate transmission and reception functions, then integration density increases, but cross talk between wiring increases causing signal interference
Solution Approach 1:
The patent utilizes vertical stacking to separate transmission and reception wiring paths into different height layers. This three-dimensional arrangement allows high-density integration of both functions while maintaining sufficient spatial separation to minimize electromagnetic coupling and cross talk between the wiring.
Solution Approach 2:
The patent implements a nested structure where transmission and reception components are arranged in vertical layers, with one set of wiring positioned above the other. This nested arrangement maximizes space utilization for high integration density while the vertical separation acts as a natural shield against cross talk interference.
3Power
If transmission electrical signals with high power are transmitted through wiring close to reception wiring, then signal transmission capability is maintained, but noise from transmission signals becomes negligible for reception signals
Solution Approach 1:
The patent positions transmission terminals at a different height than reception terminals, creating vertical separation that reduces electromagnetic coupling. This allows high-power transmission signals to be transmitted without their electromagnetic fields significantly interfering with the sensitive reception signals, thereby maintaining both transmission capability and reception quality.
Solution Approach 2:
The substrate structure acts as an intermediary barrier between transmission and reception terminals. By positioning terminals at different heights on the substrate, the substrate material provides natural electromagnetic shielding that attenuates the high-power transmission signals before they can interfere with the reception signals.
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 effectively reduces cross-talk noise in reception electrical signals, even with high-power transmission signals, by spatially separating the wiring and using a flexible substrate to shield signal electrodes, thereby improving signal integrity and reducing noise.
Implementation Method 1
a flexible substrate having flexibility and including a signal electrode that connects a first terminal of the output terminal and the input terminal to the electrode arranged on the substrate
Data Source
AI summary
An optical module includes a substrate, a package, and a flexible substrate. The substrate is provided with an electrode. The package includes a housing fixed to the substrate, a receiving unit that optically demodulates a received optical signal to convert the optical signal into a reception electrical signal, an output terminal that is provided on a surface of the housing and outputs the reception electrical signal, an input terminal that is provided at a height from the substrate different from a height of the output terminal and receives a transmission electrical signal, and a transmitting unit that optically modulates the transmission electrical signal received from the input terminal and transmits an optical signal resulting from optical modulation. A flexible substrate has flexibility and includes a signal electrode that connects one of the output terminal and the input terminal to the electrode arranged on the substrate.