Optical Modulator Temperature Control via OMA Calibration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for temperature control of ring-type optical modulators require external references for maximum optical modulation amplitude (OMA) detection, leading to high power consumption, especially as transmission speeds increase, making it difficult to design low-power circuits.
Innovation Solution
A temperature control method and apparatus that calibrate and lock the heater control voltage to achieve maximum OMA without continuous monitoring, using a heater controller, measured temperature converter, optical modulation amplitude detector, and temperature controller to store reference temperature codes and adjust heater control voltages for optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuous OMA monitoring is performed to control temperature, then temperature control precision is improved, but power consumption increases severely
Solution Approach 1:
The system performs preliminary calibration during a calibration mode to store reference temperature measurement codes corresponding to maximum OMA conditions. This preliminary action allows the system to operate in lock mode afterward without continuous OMA monitoring, significantly reducing power consumption while maintaining temperature control precision through the stored reference values.
Solution Approach 2:
The system alternates between calibration mode and lock mode operation. During lock mode, continuous OMA monitoring is stopped, and temperature control is maintained using periodic temperature sensor readings and the pre-stored reference temperature measurement codes, reducing the frequency of high-power monitoring operations.
2Measurement precision
If external reference for maximum OMA is obtained, then temperature control accuracy is improved, but device complexity increases
Solution Approach 1:
The system performs self-calibration by automatically detecting maximum OMA conditions and storing the corresponding temperature measurement codes internally. This eliminates the need for external reference sources or manual calibration procedures, reducing device complexity while maintaining temperature control accuracy through self-generated reference values.
Solution Approach 2:
The system creates internal copies of reference temperature measurement codes by storing calibrated temperature values in memory during calibration mode. These stored reference codes are then used during lock mode to control temperature, eliminating the need for continuous external references and reducing system complexity.
3Reliability
If OMA detection operation continues, then temperature control reliability is improved, but power consumption increases proportionally with transmission speed
Solution Approach 1:
The system performs preliminary calibration to store reference temperature measurement codes before normal operation begins. During lock mode, the system maintains temperature control reliability by using these pre-stored references combined with periodic temperature sensor readings, eliminating the need for continuous high-power OMA detection while maintaining reliable temperature control throughout operation.
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 allows for low-power temperature control of optical modulators without continuous OMA monitoring, reducing power consumption and maintaining optimal performance regardless of data transmission speed.
Implementation Method 1
a heater controller which is applied with a heater control code and outputs a heater control voltage generated based on the heater control code to control an operation of the heater
Implementation Method 2
a measured temperature value converter which acquires a measured temperature value from the sensor and outputs a temperature measurement code obtained by converting the measured temperature value into a digital signal
Implementation Method 3
an optical modulation amplitude detector which is applied with an electrical signal (current) for an optical signal modulated by the optical modulator, detects an optical modulation amplitude (OMA) based on the electrical signal, and outputs a detection signal corresponding to a detection result of the optical modulator amplitude (OMA)
Implementation Method 4
a temperature controller which generates a heater control code based on the temperature measurement code and the detection signal and transmits the heater control code to the heater controller to control the temperature of the optical modulator
Data Source
AI summary
Disclosed are a temperature control method of an optical modulator and an apparatus therefore. The temperature control apparatus of an optical modulator according to an exemplary embodiment of the present disclosure is to provide a temperature control method of an optical modulator which performs a calibration mode to select a heater control voltage with a maximum optical modulation amplitude (OMA) while adjusting a heater control voltage which drives a heater of the optical modulator, stores a reference temperature measurement code based on a measured temperature value of the optical modulator while driving the heater at a selected heater control voltage, and performs a lock mode which controls a temperature of the optical modulator by changing the heater control voltage using the reference temperature measurement code after stopping the optical modulation amplitude detecting operation and an apparatus therefor.