Optical Receiver High Frequency Signal Path Design
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Solution Overview
Problem
There is a growing need for improved high frequency characteristics in optical receiver devices, as existing technologies struggle to effectively handle increasing frequency demands without compromising optical coupling or introducing parasitic capacitance.
Innovation Solution
The optical receiver device incorporates a light-receiving element with a first electrode acting as an outputting electrode and a second electrode coupled to a potential different from ground, connected to the amplifier device via conductors and capacitors, which applies reverse bias and improves transmission characteristics by referencing the power supply potential as a reference potential for high frequency waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the light-receiving element is coupled to a power supply potential different from ground for reverse bias, then the detection precision and signal quality are improved, but the high frequency transmission characteristics deteriorate due to reference potential mismatch
Solution Approach 1:
A capacitor is introduced as an intermediary element between the power supply terminal and ground. This capacitor serves as a high-frequency reference potential path, allowing the light-receiving element to maintain its reverse bias connection to the power supply while providing a ground reference for high frequency signals. The capacitor blocks DC while passing AC, effectively decoupling the DC bias requirement from the AC signal reference requirement.
Solution Approach 2:
The invention changes the electrical parameter configuration by introducing a capacitive coupling instead of a direct resistive or conductive coupling. This parameter change allows the system to simultaneously satisfy two conflicting requirements: maintaining a fixed DC voltage potential for reverse bias while providing a dynamic AC ground reference for high frequency operation.
2Device complexity
If conventional wiring is used to connect the light-receiving element to the amplifier, then the device complexity is low, but the transmission characteristics at high frequencies are poor due to parasitic inductance
Solution Approach 1:
The capacitor acts as an intermediary that provides a dedicated high-frequency reference path, separating the DC bias function from the AC signal function. This intermediary element improves transmission characteristics by providing a low-inductance path for high frequency signals while maintaining the simplicity of the overall wiring structure.
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 enhances the high frequency characteristics of the optical receiver device by improving transmission characteristics and reducing unnecessary inductance, resulting in improved signal path performance and frequency response.
Implementation Method 1
The light-receiving element 10 converts a light signal into an electrical signal
Implementation Method 2
the electrode (the second electrode) coupled to the power supply applying the reverse bias is coupled to the ground electrode structuring a connection terminal of the amplifier device via a capacitor from the upper face of the amplifier device
Data Source
AI summary
An optical receiver device including: a light-receiving element having a first electrode acting as an outputting electrode and a second electrode coupled to a potential that is different from a ground potential; an amplifier device having an amplifier element, a connection terminal including a signal electrode and a ground electrode on an upper face thereof; a first conductor coupling a potential of the first electrode of the light-receiving element to the signal electrode, the first conductor being introduced from the upper face side of the amplifier device; and a second conductor coupling a potential of the second electrode of the light-receiving element to the ground electrode, the second conductor introduced from the upper face side of the amplifier device.