Temperature Sensor Patterning on Electro-Optic Transducer Die
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Solution Overview
Problem
The temperature control of electro-optic transducer junctions in optical transmission systems is hindered by thermal resistance between the temperature sensor and the transducer, leading to inaccuracies in temperature measurement and control, which affects the frequency of optical emissions and increases the risk of inter-signal interference.
Innovation Solution
Patterning a temperature sensor directly on the surface of the electro-optic transducer die reduces thermal resistance, allowing for more accurate temperature measurement and tight control of the transducer junction temperature, thereby controlling the frequency of optical emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor is placed in proximity to the electro-optic transducer junction for temperature control, then temperature control capability is improved, but thermal resistance between the sensor and junction increases leading to measurement inaccuracy
Solution Approach 1:
The temperature sensor is integrated directly onto the transducer die surface, merging the sensing function with the transducer structure. This eliminates the need for separate mounting and reduces the distance between sensor and junction to minimal levels, thereby minimizing thermal resistance and improving measurement accuracy
Solution Approach 2:
The temperature sensor is patterned on the surface of the transducer die in a two-dimensional plane, allowing the sensor to be positioned in close proximity to the junction without adding vertical height or interfering with the junction's three-dimensional structure. This surface-level integration enables optimal thermal coupling while maintaining spatial separation of functions
2Reliability
If the temperature sensor is placed closer to the electro-optic transducer junction, then thermal resistance is reduced improving temperature tracking, but the complexity of integrating the sensor increases
Solution Approach 1:
The transducer die itself serves as the mounting substrate for the temperature sensor, eliminating the need for separate mounting structures, thermal interfaces, and alignment mechanisms. The die provides both the functional transducer element and the thermal coupling pathway, simplifying the overall integration while improving reliability
Solution Approach 2:
The transducer die is designed to serve multiple functions: it acts as the electro-optic transducer element, provides structural support, and serves as the thermal coupling medium for the temperature sensor. This multi-functionality reduces the number of separate components and interfaces needed, thereby reducing integration complexity while improving thermal coupling reliability
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 temperature control of the electro-optic transducer junction, reducing inter-signal interference and potentially allowing for a narrower frequency span in DWDM systems, thus increasing optical data rates.
Implementation Method 1
a temperature sensor is provided in proximity to the electro-optic transducer junction... there will be some finite amount of thermal resistance between the temperature sensor and the electro-optic transducer junction
Implementation Method 2
The electro-optic transducer emits light when current is passed through it, the intensity of the emitted light being a function of the current magnitude
Implementation Method 3
The temperature of the electro-optic transducer junction may vary significantly as the electro-optic transducer itself generates heat
Data Source
AI summary
An optical transmit assembly having a temperature sensor patterned on an electro-optic transducer die. Due to the close proximity of the electro-optic transducer junction and the temperature sensor, the temperature sensor more accurately measures the temperature of the electro-optic transducer junction. This permits for more refined control of the frequency characteristics of optical light emitted by the electro-optic transducer junction since the emitted optical frequencies of most electro-optic transducers are heavily temperature dependent.