Optical-Electrical ATE Calibration With Closed-Loop Airflow Heating
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Solution Overview
Problem
Modern automatic test equipment (ATE) systems are not configured to rapidly test and calibrate hybrid high-speed devices like optical transceivers, which require precise temperature control across a range to ensure reliability, and existing methods can damage fragile components or waste power and design space.
Innovation Solution
A hybrid optical-electrical ATE system using airflow cooling and collateral heat from non-active components to maintain the device under test (DUT) at calibration temperatures, with a closed-loop control system adjusting airflow based on temperature sensors to prevent physical contact and optimize energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional ATE systems are used for testing optical transceivers, then electronic device testing capability is maintained, but rapid testing and calibration of hybrid optical-electrical devices cannot be achieved
Solution Approach 1:
The test system is designed to handle both traditional electronic devices and hybrid optical-electrical devices through a unified architecture. The system incorporates both electrical interfaces for conventional ATE operations and optical interfaces (laser source, photodetectors, optical switches) to test optical transceivers, enabling multi-functionality without requiring separate testing systems.
Solution Approach 2:
The system separates electrical testing functions and optical testing functions into distinct modules that can operate independently or in coordination. This segmentation allows the system to rapidly switch between different device types and testing modes, improving both productivity and adaptability.
2Stability of the object's composition
If metal blocks are used for temperature control during calibration, then temperature stability is achieved, but physical contact may damage fragile optical components
Solution Approach 1:
The system introduces an intermediary thermal field through controlled airflow and radiant heating instead of direct physical contact. heated air serves as a mediator to transfer thermal energy to the device under test without requiring physical contact, thus maintaining temperature stability while eliminating mechanical damage risk to fragile optical components.
Solution Approach 2:
The patent replaces the mechanical contact-based temperature control system (metal blocks) with a non-contact thermal control system using heated airflow and radiant heating elements. This substitution eliminates mechanical stress on components while achieving the required temperature stability for calibration.
3Temperature
If external cooling structures are integrated into the device, then temperature control capability is improved, but power consumption increases and design space is wasted
Solution Approach 1:
The system utilizes the device's own operational characteristics to achieve temperature control. During calibration, the device's laser source and photodetectors are activated, and their byproduct heat is harnessed to maintain the required calibration temperature. This self-service approach eliminates the need for external cooling structures and reduces power consumption.
Solution Approach 2:
The patent converts the harmful byproduct heat generated by active optical components into a beneficial resource for temperature control during calibration. The heat that would normally be wasted is instead utilized to maintain the precise temperatures required for calibration, eliminating the need for additional power-consuming cooling systems.
4Reliability
If multiple temperature points are used for calibration, then device reliability is improved, but calibration time increases
Solution Approach 1:
The system pre-heats or pre-cools the calibration environment and components before actual calibration begins. Temperature control is established in advance, so when calibration at multiple temperature points is required, the transitions are faster and more efficient, reducing overall calibration time while maintaining reliability.
Solution Approach 2:
The temperature control system dynamically adjusts heating and cooling rates based on the current temperature and target temperature. During transitions between calibration temperature points, the system optimizes the rate of change to achieve rapid yet controlled temperature shifts, minimizing calibration time while ensuring temperature stability at each calibration point.
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
Enables rapid, precise, and non-destructive calibration of optical-electrical devices across various temperatures, improving reliability and reducing power consumption and design constraints.
Implementation Method 1
direct a high pressure airflow towards the PIC such that the temperature of the PIC is adjusted closer to the initial temperature
Implementation Method 2
an integrated temperature sensor that is integrated in the optical-electrical circuit structure, the integrated temperature sensor being positioned proximate to the active optical components such that the integrated temperature sensor receives heat generated by the active optical components
Data Source
AI summary
An optical-electrical device can implement a feedback-based control loop for temperature of the device during component calibration. The optical-electrical device can implement compressed air to vary the device temperature during calibration. Additionally, non-active components of the device can be provided current to vary the temperature of the device in concert with the provided compressed air. Additional calibration temperatures can be implemented by activating and deactivating additional non-active components in the device, such as light sources, optical amplifiers, and modulators.