Laser Array Assembly With Spare Lasers for Failure-Tolerant Power
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Solution Overview
Problem
High-density laser arrays in optoelectronic modules face challenges in maintaining reliability and yield due to manufacturing tolerances and the need for compact designs, where multiple lasers integrated on a chip can lead to failure if one laser fails, affecting the entire array.
Innovation Solution
Incorporating a primary laser and a spare laser on a single optoelectronic chip with a multimode interference coupler or directional coupler, which includes a quantum well intermixing region to maintain signal integrity and power, and using amplifier arrays to enhance signal strength, while ensuring the spare laser can activate if the primary fails, thus improving reliability and yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple lasers are integrated on a single chip to achieve high-density laser arrays, then the compactness and power of the optoelectronic module are improved, but the reliability deteriorates because failure of one laser affects the entire array
Solution Approach 1:
The laser array is segmented into multiple independent laser elements (primary lasers and spare lasers) that can operate independently. Each laser is isolated optically through the use of directional couplers and optical isolation mechanisms, allowing individual failure without affecting the entire array. This segmentation enables the system to maintain operation with partial laser failure.
Solution Approach 2:
Spare lasers are pre-integrated into the chip alongside primary lasers, providing a backup mechanism before failure occurs. The spare lasers remain dormant during normal operation but can be activated when a primary laser fails, cushioning against the reliability impact of laser failure and ensuring continuous operation.
2Area of stationary object
If multiple lasers are integrated on a single chip to achieve high-density laser arrays, then the compactness of the optoelectronic module is improved, but the manufacturing yield deteriorates due to manufacturing tolerances
Solution Approach 1:
The chip is designed with segmented laser elements and optical paths that are relatively independent of each other. This segmentation reduces the cumulative impact of manufacturing tolerances, as errors in one segment do not propagate to affect the entire array. Each laser element can be optimized and tested independently, improving overall manufacturing yield.
Solution Approach 2:
The design incorporates parameter variations in the optical coupling mechanisms and laser spacing to accommodate manufacturing tolerances. By designing the optical system to be tolerant of parameter variations within a range, the system maintains performance despite variations in manufacturing precision, thereby improving yield.
3Reliability
If quantum well intermixing regions are used in the multimode interference coupler, then the signal integrity and power maintenance are improved, but the device complexity increases
Solution Approach 1:
The quantum well intermixing region is merged with the multimode interference coupler structure, combining the optical coupling function with the wavelength-selective filtering function in a single integrated component. This merging reduces the need for separate components and minimizes the overall device complexity while maintaining signal integrity.
Solution Approach 2:
The coupler utilizes composite material structures combining different semiconductor layers with distinct optical properties. The quantum well intermixing region creates a composite material system that provides both the coupling and wavelength-selective functions, achieving complex functionality through material composition rather than structural complexity.
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 configuration enhances the reliability and yield of high-density laser arrays by ensuring continuous operation even if a primary laser fails, maintaining high power and low cost, and reducing absorption losses through passive optical components, thereby achieving compact and efficient optoelectronic modules.
Implementation Method 1
The quantum well intermixing region may include a first region and a second region. The first region may be transparent to wavelengths of light generated by the laser array.
Implementation Method 2
annealing to diffuse vacancies in the quantum well and barrier layer
Implementation Method 3
ion implanting the buffer layer
Data Source
AI summary
In one example, an optoelectronic assembly may include a laser array, an amplifier array, and a multimode interference coupler optically coupling the laser array and the amplifier array. The laser array may include at least one primary laser and at least one spare laser configured to be activated if the primary laser fails. The amplifier array may include at least two amplifiers configured to amplify optical signals received from the laser array.