Optical Transmitter TEC Current Suppression via Activation Sequence
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Solution Overview
Problem
Optical transceivers face challenges in reducing rush current and accelerating thermal stabilization of thermo-electric coolers (TECs) due to heat generated by drivers and temperature differences, especially in compact designs where drivers are closely mounted with TECs, leading to increased peak TEC current.
Innovation Solution
The optical transmitter module incorporates a micro-control-unit (MCU) that controls a TEC controller and LD driver, activating the TEC controller before the LD driver when the ambient temperature is higher than the target temperature and vice versa, to manage thermal stabilization and reduce peak TEC current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the driver is mounted close to or directly on the TEC to increase assembly density, then the compactness and integration of the optical transmitter is improved, but the heat generated by the driver increases the rush current of the TEC and prolongs thermal stabilization time
Solution Approach 1:
The patent applies preliminary action by detecting the ambient temperature before activating the driver and, when necessary, pre-activating the TEC to reach thermal stabilization before the driver generates heat. This advance preparation prevents the driver's heat from causing excessive rush current when the TEC is already stable.
2Use of energy by stationary object
If the TEC is activated first to stabilize temperature before driver activation, then the rush current is reduced, but the thermal stabilization time is prolonged when ambient temperature is low
Solution Approach 1:
The patent implements dynamics by making the activation sequence flexible rather than fixed. The control unit dynamically adjusts whether to activate the TEC first or the driver first based on real-time ambient temperature detection. When ambient temperature is high, TEC activates first to prevent rush current; when ambient temperature is low, driver activates first to reduce stabilization time.
3Speed
If the driver is activated first to reduce thermal stabilization time, then the response speed is improved, but the peak TEC current increases due to heat generated by the driver
Solution Approach 1:
The patent uses feedback by continuously monitoring ambient temperature and using this information to control the activation sequence. The temperature detection provides feedback to the control unit, which then decides the optimal activation order to balance response speed and peak current, preventing excessive TEC current while maintaining fast response.
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 effectively suppresses the peak TEC current by controlling the activation sequence based on ambient temperature, reducing the rush current and enhancing thermal stabilization efficiency.
Implementation Method 1
a thermo-electric cooler (TEC) that mounts the LDs and the driver thereon
Data Source
AI summary
An algorithm to reduce a peak current for a transmitter module with multiple laser diodes (LDs) is disclosed. When the current temperature of the LDs is higher than the target temperature, the thermo-electric cooler (TEC) controller is first activated then the LD driver to drive the LDs is subsequently activated with a substantial delay. When the ambient temperature of the LDs is lower than the target temperature, the LD driver is first driven; then, the TEC controller is subsequently activated.