Optical Receiver Shielding for Noise Resistance
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Solution Overview
Problem
Conventional optical receivers are susceptible to electromagnetic noise due to direct exposure of signal lines and terminals, leading to deterioration of reception sensitivity and amplification noise resistance, especially when integrated with optical transmitters in the same enclosure.
Innovation Solution
The optical receiver design incorporates a conductor pattern or ground pattern surrounding the signal lines to shield electromagnetic waves, with power sources integrated into the TIA chip, reducing external electromagnetic interference by grounding or using capacitors for stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If signal lines and terminals are directly exposed for easy connection, then ease of operation is improved, but electromagnetic noise susceptibility increases
Solution Approach 1:
A conductor pattern or ground pattern is introduced as an intermediary shielding structure between external electromagnetic sources and the signal lines/terminals. This conductor pattern acts as a mediator that intercepts electromagnetic waves before they reach the sensitive signal lines, thereby reducing noise susceptibility while maintaining direct exposure connections for ease of operation
2Device complexity
If photodiodes and transimpedance amplifiers are integrated on the same chip, then device complexity is reduced, but electromagnetic interference increases
Solution Approach 1:
The integrated chip is segmented into distinct functional regions: a photodiode array region and a transimpedance amplifier region. The conductor pattern creates electromagnetic shielding partitions between these regions, allowing high-level integration while reducing internal electromagnetic interference through spatial segmentation and localized shielding
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 electromagnetic interference, enhancing the optical receiver's noise resistance and sensitivity, even in environments with high electrical noise from adjacent transmitters.
Implementation Method 1
The optical receiver design incorporates a conductor pattern or ground pattern surrounding the signal lines to shield electromagnetic waves
Implementation Method 2
an optical receiver 2 and an optical transmitter 3. An input optical signal inputted to the optical receiver 2 is converted into electric signals by four channels of dual photodiodes (PDs) 5
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An optical receiver is configured so as to be as less susceptible to noise as possible even in the case where high noise occurs inside an optical transceiver. The optical receiver includes a connection part that connects two photodiodes (PDs) constituting a dual photodiode and a transimpedance amplifier (TIA), wherein signal lines from the dual photodiode are surrounded by a conductor pattern that is not connected to each of the signal lines for each channel, and the conductor pattern is connected to a ground pattern on the transimpedance amplifier or a power source pattern for the PDs.