Transceiver Laser Power Calibration via Temperature and Voltage Compensation
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Solution Overview
Problem
Conventional methods for measuring laser power in optoelectronic devices, such as optical transceivers, fail to accurately compensate for temperature and voltage variations, leading to inaccurate measurements of laser power and other monitored parameters.
Innovation Solution
Incorporating a processor, system memory, and persistent memory with microcode that defines a formulaic relationship between laser power and parameters like temperature, voltage, and thermoelectric cooler current, allowing for accurate calculation of laser power by executing this relationship during device operation and sensing necessary data with sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional single-calibration methods are used for measuring laser power, then the device complexity is low, but the measurement precision deteriorates due to inability to compensate for temperature and voltage variations
Solution Approach 1:
The patent applies parameter changes by introducing multiple calibration parameters (temperature coefficients, voltage coefficients) to compensate for environmental variations. The system measures temperature and voltage parameters and uses these to dynamically adjust the laser power calculation, transforming a static single-calibration system into a dynamic multi-parameter compensation system that maintains measurement accuracy under varying conditions.
Solution Approach 2:
The patent implements feedback mechanisms by continuously monitoring temperature and voltage parameters and using this information to correct laser power measurements. The system establishes feedback loops where measured environmental parameters are fed back into the calculation algorithm to compensate for their effects, ensuring accurate laser power determination despite external condition changes.
2Reliability
If multiple parameters are monitored and compensated for, then the reliability of laser power determination improves, but the device complexity increases due to additional sensors and processing requirements
Solution Approach 1:
The patent applies universality by designing a controller that performs multiple functions: it manages laser operation, monitors temperature, measures voltage, and executes compensation calculations. By integrating these diverse functions into a single controller unit, the system achieves high reliability through multi-parameter monitoring without proportionally increasing overall device complexity, as the controller serves as a multi-functional hub.
Solution Approach 2:
The patent merges temperature sensing, voltage measurement, and laser power calculation functions into a unified compensation system. The controller combines multiple measurement inputs (temperature from temperature sensor, voltage from voltage sensor) and processes them together through a single compensation algorithm, reducing the need for separate independent systems and thereby limiting complexity growth while improving reliability.
3Measurement precision
If environmental parameters are compensated for in real-time, then the accuracy of laser power measurements is improved, but the processing time and computational requirements increase
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing compensation coefficients and calibration data in memory before actual laser power measurements are needed. The system stores temperature coefficients, voltage coefficients, and calibration constants that are determined in advance, allowing the controller to perform real-time compensation using pre-prepared data rather than performing complex calculations from scratch during measurement, thus reducing processing time.
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 approach enables precise measurement of laser power, improving accuracy and ensuring proper coupling efficiency and eye safety by accounting for multiple operational and environmental factors in real-time.
Implementation Method 1
laser power is often calculated indirectly by placing a photodiode near a laser and measuring the amount of residual light being transmitted from the laser. The photodiode produces a current that corresponds with the amount of light emitted
Implementation Method 2
The formulaic relationship between laser power and various parameters such as, but not limited to, temperature, voltage, laser bias current, and thermoelectric cooler ('TEC') current
Data Source
AI summary
A method for calibrating the calculation of a laser power measurement with respect to specified operational and/or environmental parameters in an optoelectronic device, such as an optical transceiver module having a laser diode, is disclosed. In particular, the method includes sensing analog data that relates to light emission from the laser diode using a monitor photodiode disposed in the optical transceiver module. Additional sensors are then used to sense analog data that relates to the temperature and voltage of the monitor photodiode. The analog data is converted into digital data, then a formulaic relationship that relates the light emission data to the temperature and voltage data is used to calculate the laser power of the laser diode. Calibration by this method accounts for unintended effects caused by temperature and voltage fluctuations in the optical transceiver module.