Optical Module Laser Switching for Thermal Protection
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Solution Overview
Problem
Current photonic technologies for radio base stations face challenges with low energy efficiency, high frequency-dependent channel loss, and complex equalization circuits due to the integration of internal lasers in optical transceivers, which also pose issues with thermal management and serviceability.
Innovation Solution
The proposed solution involves an optical module with internal lasers and an external laser source, where a controller monitors the temperature of internal lasers and switches to an external optical signal when thermal stress is detected, reducing the operating power of internal lasers and maintaining optical power consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If internal lasers are integrated into the optical transceiver, then device integration and cost are improved, but thermal management becomes difficult and laser lifetime decreases
Solution Approach 1:
The system segments the laser function into internal lasers for normal operation and external lasers for thermal protection, allowing the internal lasers to be integrated for cost efficiency while external lasers handle thermal management challenges
Solution Approach 2:
External lasers are prepared in advance as backup sources that can be activated when thermal stress is detected, cushioning against potential damage to internal lasers from thermal runaway
2Ease of manufacture
If internal lasers are integrated into the optical transceiver, then device integration is improved, but laser serviceability and reliability worsen
Solution Approach 1:
The laser system is segmented into replaceable external laser modules and fixed internal lasers, allowing the external modules to be serviced independently while maintaining the integrated design benefits
Solution Approach 2:
External laser modules can be discarded and replaced when failed, while internal lasers are protected from failure through thermal management, recovering system functionality without replacing the entire integrated transceiver
3Power
If internal lasers operate at high power, then optical signal quality is improved, but thermal stress increases and may cause laser failure
Solution Approach 1:
The system dynamically switches between internal and external lasers based on thermal conditions, allowing internal lasers to operate at high power when cool and transitioning to external lasers when thermal stress becomes critical
Solution Approach 2:
Temperature sensors provide feedback on internal laser thermal conditions, triggering activation of external lasers when thermal thresholds are exceeded, creating a closed-loop thermal management system
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 mitigates thermal stress and extends the operating lifetime of internal lasers, while maintaining performance and reducing costs by utilizing cost-effective internal lasers for most operations and external lasers only when needed.
Implementation Method 1
a temperature sensor arranged to sense a temperature of the internal lasers and to generate a temperature reporting signal
Implementation Method 2
optical modulators arranged to modulate optical signals
Data Source
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AI summary
Communications network optical apparatus (100) comprising an optical module (120) and a controller (140). The optical module (120) comprises optical modulators (122), internal lasers (124) to generate internal optical signals, an input port (126) to receive an external optical signal from an external laser, optical routing devices (128) to route internal optical signals from internal lasers to optical modulators and to route an external optical signal from the input port to at least one of the optical modulators. and a temperature sensor (130) to sense a temperature of the internal lasers and to generate a temperature reporting signal. The controller (140) comprises processing circuitry (142) and memory (144) containing instructions which when executed by the processing circuitry cause the controller to perform operations including receiving the temperature reporting signal, determining that a thermal protection condition exists based on the temperature of the internal lasers, and in response to the determining, generating control signals configured to cause the external optical signal to be provided to at least one optical modulator and to cause an operating power of at least one respective internal laser to be reduced.