Optical Receiver Sensitivity Control via PWM Boost Converter
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In fiber optical network applications, insufficient or unstable light sensitivity of photodiodes leads to a high signal-to-noise ratio and increased bit error rates due to inadequate digital to analog conversion and gain control in optical receiver devices.
Innovation Solution
An optical receiver device incorporating a boost converter circuit, optical receiver circuit, and pulse width modulation controller circuitry that converts supply voltage using pulse width modulation signals to adjust output voltage, perform digital to analog conversion, and control gain for stable sensitivity, thereby preventing overshoot and undershoot voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional voltage conversion methods are used in optical receiver devices, then the device complexity is reduced, but the sensitivity stability deteriorates due to voltage overshoot and undershoot
Solution Approach 1:
The patent implements a feedback mechanism where the PWM controller circuitry continuously monitors the output voltage from the boost converter circuit and adjusts the PWM signal accordingly. This closed-loop feedback system ensures that the output voltage remains stable and prevents overshoot or undershoot, thereby maintaining consistent sensitivity of the optical receiver circuit without requiring overly complex external control systems.
Solution Approach 2:
The patent introduces PWM controller circuitry as an intermediary component between the boost converter circuit and the optical receiver circuit. This intermediary performs digital-to-analog conversion and generates precise PWM signals that gradually adjust the output voltage, preventing direct voltage fluctuations from affecting the optical receiver and thus stabilizing sensitivity while managing system complexity.
2Speed
If rapid voltage adjustment is implemented, then the response speed is improved, but voltage overshoot or undershoot occurs leading to sensitivity instability
Solution Approach 1:
The patent employs periodic pulse width modulation signals to adjust the output voltage. Instead of continuous or rapid single-step adjustment, the PWM controller applies periodic pulses with varying widths that gradually adjust the voltage level. This periodic action allows the voltage to change in controlled increments, preventing overshoot and undershoot while maintaining acceptable response speed for sensitivity stabilization.
Solution Approach 2:
The PWM controller circuitry performs preliminary digital-to-analog conversion before generating the PWM signal, preparing the voltage adjustment in advance in a controlled manner. This preliminary action ensures that the voltage changes are pre-calculated and applied gradually through the PWM duty cycle, preventing sudden jumps that would cause overshoot or undershoot and maintain sensitivity stability.
3Reliability
If simple gain control is used, then the device complexity is reduced, but the signal to noise ratio deteriorates due to insufficient sensitivity control
Solution Approach 1:
The PWM controller circuitry serves multiple functions simultaneously: it performs digital-to-analog conversion, generates PWM signals for voltage control, and stabilizes the output voltage to the boost converter. This multi-functionality allows the system to achieve precise sensitivity control and improved signal-to-noise ratio without adding separate dedicated circuits for each function, thereby managing device complexity while enhancing performance.
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
The solution ensures stable sensitivity of the optical receiver circuit by gradually adjusting the output voltage through digital to analog conversion, preventing voltage overshoot or undershoot and maintaining a stable gain, thus reducing bit error rates and improving signal quality.
Implementation Method 1
a boost converter circuit configured to convert a supply voltage according to a pulse width modulation signal, in order to generate an output voltage
Implementation Method 2
a photodiode is utilized to convert an optical signal to an electrical signal for subsequent data processing
Data Source
AI summary
An optical receiver device includes a boost converter circuit, an optical receiver circuit, and a pulse width modulation controller circuitry. The boost converter circuit is configured to convert a supply voltage according to a pulse width modulation signal, in order to generate an output voltage. The optical receiver circuit is configured to set a gain according to the output voltage, in order to convert an optical signal to a data signal according to the gain. The pulse width modulation controller circuitry is configured to perform a digital to analog conversion according to a control code to gradually adjust a current associated with the output voltage, and to compare the output voltage with a reference voltage to generate the pulse width modulation signal.