Optical Module Temperature Compensation With Mechanical Switching
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Solution Overview
Problem
Optical communication modules face challenges in maintaining proper modulation performance and optical power across a wide range of temperatures due to temperature-dependent output characteristics of optical devices, particularly in low-temperature and high-temperature environments.
Innovation Solution
Incorporating a temperature compensation element that includes heating and cooling mechanisms, such as a thermoelectric element or bi-metal switch, to adjust the optical device's temperature, ensuring optimal operation by maintaining a constant temperature difference from ambient temperature, thereby extending the operational range from -50°C to 110°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If optical devices are used without temperature compensation, then the device structure remains simple, but the modulation performance and optical power cannot be maintained across wide temperature ranges
Solution Approach 1:
The temperature compensation function is segmented into distinct heating and cooling circuits that can operate independently. The heating circuit includes a heating element and heating switch, while the cooling circuit includes a heat absorbing element and cooling switch. This segmentation allows the system to maintain simplicity while achieving wide temperature range adaptability by activating only the necessary circuit based on ambient conditions.
Solution Approach 2:
The mechanical switches automatically detect ambient temperature and self-regulate the activation of heating or cooling circuits without requiring external control systems. The heating switch turns on the heating element when ambient temperature is low, and the cooling switch turns on the heat absorbing element when ambient temperature is high, enabling the system to maintain optimal performance across wide temperature ranges through self-service operation.
2Reliability
If complex feedback structures and real-time temperature measurement are implemented, then temperature control precision is improved, but the device complexity and cost increase
Solution Approach 1:
The mechanical switches serve as self-service temperature sensing elements that automatically activate the appropriate temperature compensation circuit based on ambient temperature conditions. This eliminates the need for separate temperature sensors, microcontrollers, and complex feedback control systems, maintaining reliability through automatic operation while keeping the control system simple.
Solution Approach 2:
The patent replaces electronic temperature sensing and control systems with a mechanical switch-based control system. The mechanical switches directly respond to ambient temperature changes and mechanically open or close circuits to activate heating or cooling elements, substituting complex electronic feedback mechanisms with a simpler mechanical-relay system that achieves reliable temperature control.
3Temperature
If heating and cooling elements are continuously activated, then temperature stability is improved, but energy consumption increases
Solution Approach 1:
The temperature compensation system dynamically adjusts its operation based on ambient temperature conditions. The mechanical switches automatically activate heating or cooling circuits only when needed, and the system continuously monitors temperature to adjust the compensation level. This dynamic operation maintains optimal optical device temperature stability while minimizing energy consumption by avoiding continuous activation of heating and cooling elements.
Solution Approach 2:
The temperature compensation operates in periodic cycles rather than continuously. The mechanical switches periodically activate the heating or cooling circuits based on temperature threshold detection, allowing the system to maintain temperature stability through intermittent action. This periodic operation significantly reduces energy consumption compared to continuous activation while maintaining effective temperature control.
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 effectively maintains proper modulation performance and optical power across a wide temperature range, ensuring reliable operation of optical communication modules in varying environmental conditions without the need for complex feedback structures or real-time temperature measurement.
Implementation Method 1
the bi-metal comprises different types of metal plates which are bonded together and have different thermal expansion coefficients
Implementation Method 2
the temperature compensation element may include a heating element configured to generate heat at a low temperature
Implementation Method 3
a heat absorbing element configured to absorb heat at a high temperature
Implementation Method 4
a thermoelectric element including a first surface facing the optical device and a second surface opposite the first surface, one of the first and second surfaces functioning as a heating surface having a relatively high temperature, the other of the first and second surfaces functioning as a heat absorbing surface having a relatively low temperature
Data Source
Figure 1
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AI summary
Provided is an optical communication module. The optical communication module includes: an optical device configured to provide an optical output from an electrical input; a circuit board on which the optical device is mounted and which is configured to provide the electrical input to the optical device; a temperature compensation element mounted on a side of the circuit board; and a mechanical switch connected to the temperature compensation element and configured to turn on/off according to ambient temperature for supplying or interrupting power to the temperature compensation element. The optical communication module includes the temperature compensation element configured to heat or cool the optical device according to ambient temperature, thereby maintaining proper modulation performance and optical power over a wide range of temperature in low-temperature and high-temperature environments.