Optoelectrical Assembly Bias Voltage Control for Stable Optical Power
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Solution Overview
Problem
Current optoelectrical assemblies adjust optical power output using adjustable current sources, resulting in low efficiency due to unnecessary voltage drops and complex control logic, making it difficult to maintain optical power within a preset range for stable operation.
Innovation Solution
The optoelectrical assembly incorporates a voltage conversion circuit to provide a bias voltage to the optoelectrical semiconductor device, with an optoelectrical detection circuit and controller adjusting the bias voltage based on detected optical power, eliminating the need for current sampling and simplifying control logic, thereby improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If an adjustable current source is used to adjust optical power output, then optical power control is achieved, but conversion efficiency decreases due to unnecessary voltage drops
Solution Approach 1:
Instead of using a current source to control optical power (conventional approach), the patent inverts the approach by using a voltage source to directly control the optical power output. This inversion eliminates the need for current sampling circuits and complex feedback loops, thereby improving conversion efficiency and simplifying control logic.
Solution Approach 2:
The patent extracts and removes the unnecessary current sampling circuit and complex feedback control logic from the system. By directly using voltage control, the components responsible for current measurement and complex control algorithms are eliminated, reducing system complexity and energy loss.
2Reliability
If current sampling is implemented to control optical power, then power stabilization is achieved, but hardware costs increase
Solution Approach 1:
The patent removes the current sampling circuit hardware from the system. By adopting direct voltage control, the components needed for current measurement (such as current sensing resistors and sampling circuits) are eliminated, reducing hardware costs while maintaining optical power stabilization through simplified voltage-based feedback.
3Measurement precision
If complex feedback loops are used to maintain optical power, then power control precision is improved, but system complexity increases
Solution Approach 1:
The patent simplifies the feedback loop by inverting the control variable from current to voltage. Instead of measuring current and computing complex control algorithms, the system directly measures voltage and applies simple voltage control, achieving power control precision with minimal feedback complexity.
Solution Approach 2:
The patent implements a simplified feedback mechanism where the optical power detection circuit directly feeds back voltage information to the control circuit. This feedback loop, combined with voltage control, achieves precise power control without requiring complex control logic or multiple feedback stages.
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 solution enhances the conversion efficiency of the optoelectrical assembly to 90% or higher, reduces hardware costs, and facilitates miniaturization by eliminating the need for additional voltage drops and complex feedback loops.
Implementation Method 1
an optoelectrical semiconductor device, an output terminal coupled to a second input terminal of the voltage conversion circuit
Implementation Method 2
an optoelectrical detection circuit configured to receive the light output by the optoelectrical semiconductor device, detect the output optical power
Data Source
AI summary
An optoelectrical assembly includes a voltage conversion circuit, an optoelectrical semiconductor device, an optoelectrical detection circuit, and a controller. The voltage conversion circuit provides a bias voltage to the optoelectrical semiconductor device, and adjusts, by changing the bias voltage, an output optical power. A differential resistance value (Rdiff) of the optoelectrical semiconductor device within a range of a target optical power satisfies 0.1 ohm (Ω)≤Rdiff≤50Ω, and the differential resistance value is a ratio of a voltage variation to a current variation corresponding to the voltage variation. The optoelectrical detection circuit detects the output optical power, and outputs a detection signal to the controller. The controller determines a control signal based on the detection signal, and outputs the control signal to the voltage conversion circuit, where the control signal is used to adjust the bias voltage.