Optical Receiver Noise Isolation via Reference Potential Segmentation
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Solution Overview
Problem
Optical receivers in optical transmission systems face significant noise interference from the reference potential terminal, leading to a deterioration of the signal-to-noise ratio (SNR), especially as the number of channels increases, due to parasitic capacitance and noise propagation through interconnects and transmission lines.
Innovation Solution
The optical receiver design isolates the capacitive passive element's second electrode to the reference potential terminal of the current-voltage conversion circuit, preventing noise coupling from other components and ensuring the reference potential is only connected to the current-voltage conversion circuit, thereby reducing noise impact on the input terminal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the second electrode of the capacitive passive element is connected to the reference potential terminal of the current-voltage conversion circuit, then noise coupling from other components is prevented and SNR is improved, but device complexity increases due to isolated connection requirements
Solution Approach 1:
The patent segments the connection path of the capacitive passive element's second electrode, isolating it to connect only to the reference potential terminal of the current-voltage conversion circuit. This segmentation prevents noise coupling from other components while maintaining a manageable connection configuration through clear, dedicated pathways.
Solution Approach 2:
The patent extracts the second electrode connection from common reference potential networks and dedicat It solely to the current-voltage conversion circuit's reference potential terminal. This extraction eliminates noise coupling from other components connected to shared reference potentials while simplifying the overall connection logic through specialized dedicated connections.
2Measurement precision
If the reference potential is isolated to only the current-voltage conversion circuit, then noise propagation from other components is reduced, but manufacturing complexity increases due to specialized connection requirements
Solution Approach 1:
The patent segments the reference potential network into isolated connection paths, with the capacitive passive element's second electrode connecting exclusively to the current-voltage conversion circuit's reference potential terminal. This segmentation reduces noise propagation while maintaining manufacturing feasibility through clear, dedicated connection pathways that simplify assembly procedures.
Solution Approach 2:
The patent introduces the current-voltage conversion circuit's reference potential terminal as an intermediary connection point. This intermediary provides a dedicated noise-free reference potential connection for the capacitive passive element, reducing noise propagation while simplifying manufacturing through standardized intermediate connection interfaces.
3Measurement precision
If parasitic capacitance and noise propagation through interconnects are reduced, then SNR accuracy is improved, but the number of isolated connection paths increases circuit complexity
Solution Approach 1:
The patent extracts the critical reference potential connection from noisy interconnect networks and dedicates it solely to the current-voltage conversion circuit. This extraction reduces parasitic capacitance and noise propagation effects while maintaining circuit simplicity through a single, dedicated connection path that eliminates the need for multiple complex isolation pathways.
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 decreases noise superimposed on the signal, enhancing the accuracy of the signal-to-noise ratio (SNR) by isolating noise sources and ensuring clean reference potential transmission, applicable to both single and multiple channel systems.
Implementation Method 1
A photodiode (PD) converts the optical data sent from the optical transmitter (TX) to a current
Data Source
AI summary
Disclosed herein is an optical receiver including: a light receiving element configured to have an anode and a cathode and generate a photocurrent dependent on received signal light; a current-voltage conversion circuit configured to be connected to the anode of the light receiving element and convert the photocurrent to a voltage signal; and a capacitive passive element configured to have a first electrode and a second electrode. The cathode of the light receiving element is connected to the first electrode of the capacitive passive element, and the second electrode of the capacitive passive element is connected to a reference potential of the current-voltage conversion circuit and the second electrode is not coupled to objects other than a reference potential terminal of the current-voltage conversion circuit.