Optical Module Bias Control for Modulator Working-Point Stability
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Solution Overview
Problem
The challenge in optical communication technology is to maintain high-speed, long-distance, and low-cost information transmission while ensuring stable optical signal conversion between optical and electrical signals, particularly in optical modules, due to fluctuations in the optimal working point of optical modulators caused by external conditions.
Innovation Solution
An optical module design incorporating a light source, optical modulation chip with a phase converter, first and second optical power detection assemblies, a comparison circuit, and an MCU to adjust the bias voltage for the phase converter, maintaining a preset difference in detection voltages to stabilize the optical modulator's working point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the optical modulator operates at high data transmission rates, then the productivity is improved, but the stability of the working point deteriorates due to external condition fluctuations
Solution Approach 1:
The patent implements a feedback control mechanism where the first optical power detection assembly continuously monitors the optical power at the input of the optical modulator, and the second optical power detection assembly monitors the optical power at the output. The comparison circuit compares these two detection voltages, and the MCU adjusts the bias voltage of the phase converter based on the comparison result to maintain the optical modulator at its optimal working point, thereby stabilizing performance during high-speed operation
Solution Approach 2:
The optical module performs self-adjustment through the automatic working point stabilization mechanism. The system uses its own detection assemblies and comparison circuit to monitor its performance and automatically correct deviations by adjusting the bias voltage, without requiring external intervention, ensuring continuous stable operation at high data transmission rates
2Ease of manufacture
If the optical module structure is simplified to reduce cost, then the ease of manufacture is improved, but the precision of working point control deteriorates
Solution Approach 1:
The patent introduces a phase converter as an intermediary component between the light source and the optical modulator. The phase converter, controlled by bias voltage adjustment, serves as a mediator to fine-tune the optical signal characteristics and compensate for working point drift, enabling precise control without significantly complicating the overall module structure
Solution Approach 2:
The system achieves precise working point control by dynamically changing the bias voltage parameter of the phase converter. The MCU adjusts this voltage parameter based on real-time comparison between input and output optical power detection voltages, allowing precise compensation for environmental variations and manufacturing tolerances without requiring complex structural modifications
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
Stabilizes the optical modulator's working point, reducing bit error rates and ensuring consistent signal quality by dynamically adjusting the bias voltage to compensate for drifts, thereby enhancing the performance of optical signal conversion.
Implementation Method 1
an optical modulation chip which includes an optical modulator, the optical modulator being configured to modulate the direct current light that does not carry data into an optical signal, and the optical modulator including a phase converter
Implementation Method 2
a first optical power detection assembly arranged at a light input side of the optical modulator, a detection voltage of the first optical power detection assembly being a first detection voltage; a second optical power detection assembly arranged at a light output side of the optical modulator, a detection voltage of the second optical power detection assembly being a second detection voltage
Data Source
AI summary
An optical module includes: an optical modulation chip having an optical modulator, the optical modulator including a phase converter, a first optical power detection assembly and a second optical power detection assembly arranged at light input and light output sides of the optical modulator, a comparison circuit configured to receive a second detection voltage and a first detection voltage from the second and first optical power detection assemblies and output a comparison voltage; and an MCU configured to monitor the comparison voltage and output a bias voltage to the phase converter, adjust the bias voltage to the phase converter in case of monitoring the comparison voltage not equal to a preset voltage while the optical module is in a preset state, such that a difference between the first detection voltage and the second detection voltage is a preset difference, thereby adjusting the comparison voltage to a preset voltage.