Silicon Photonic Chip Phase and Power Stabilization
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Solution Overview
Problem
Silicon photonic chips in transmitter optical subassemblies experience temperature-induced changes in optical signal phase and power, requiring time-consuming testing of each unit under different temperatures to stabilize optical characteristics, which is inefficient and increases power consumption.
Innovation Solution
An adjustment device and method that includes a first control component to adjust the phase setting parameter of the silicon photonic chip and a second control component to adjust the bias current, both connected to a control unit that transmits target values to stabilize the optical signal phase and power without additional temperature control components, using PID control and sensing modules to achieve phase and power target values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature control components (TEC) are added to stabilize optical signals, then optical signal stability is improved, but power consumption and device complexity increase
Solution Approach 1:
The patent extracts and removes the TEC (temperature control component) from the system. Instead of controlling temperature to stabilize optical signals, the invention directly controls the optical signal characteristics through phase and power adjustment mechanisms, eliminating the need for power-consuming temperature control hardware while achieving the same stability goal
Solution Approach 2:
The patent replaces the mechanical/thermal control system (TEC) with an optical/electrical control system. By using phase modulators and power adjusters that directly manipulate optical signal parameters rather than controlling physical temperature, the system achieves signal stability without the power consumption and complexity of thermal management components
2Manufacturing precision
If comprehensive testing under different temperatures is performed to stabilize optical characteristics, then optical parameter stability is improved, but testing time and productivity are reduced
Solution Approach 1:
The patent implements preliminary adjustment mechanisms that pre-compensate for temperature-induced optical signal variations. By establishing phase and power adjustment capabilities before actual operation, the system can directly correct optical parameters without requiring time-consuming post-manufacturing temperature cycling tests, thereby improving both precision and productivity
Solution Approach 2:
The patent changes the approach from physical parameter control (temperature) to optical parameter control (phase and power). By adjusting optical signal characteristics directly rather than controlling environmental temperature, the system achieves stable optical output without requiring extensive temperature-based characterization testing, thus improving manufacturing efficiency while maintaining precision
3Reliability
If phase and bias current adjustments are made to compensate for temperature effects, then optical signal stability is improved, but device complexity and control difficulty increase
Solution Approach 1:
The patent merges the phase control and power control functions into a unified adjustment system. By coordinating phase modulator and power adjuster operations under a single control framework, the system achieves temperature compensation through integrated control rather than separate complex control loops, reducing overall control complexity while maintaining signal stability
Solution Approach 2:
The patent implements feedback mechanisms that monitor optical signal characteristics and automatically adjust phase and power parameters. This closed-loop control system continuously compensates for temperature effects without requiring complex manual calibration or multiple independent control systems, achieving stability through automated feedback while keeping the control architecture manageable
Data Source
AI summary
An adjusting method for stabilizing optical characteristic parameters applicable to transmitter optical subassemblies with silicon photonic chips is provided. The adjusting method might include: sensing an initial optical signal emitted by the transmitter optical subassembly with first control component, controlling phase setting parameter of the silicon photonic chip with the first control component to change the transmitter optical subassembly from emitting the initial optical signal to emitting a first modified optical signal, transmitting a power target value to second control component when the first modified optical signal conforms to the phase target value and sensing the first modified optical signal with the second control component, and controlling a bias current of the transmitter optical subassembly according to the first modified optical signal and the power target value to change the transmitter optical subassembly from emitting the first modified optical signal to emitting a second modified optical signal.