Multi-Laser Package Shared Optics Sub-Micron Alignment
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Solution Overview
Problem
The increasing demand for multiple wavelengths in optical communications transmitters and transceivers necessitates a reduction in the size and cost of optical devices with multiple laser emitters, while maintaining accurate alignment to prevent performance issues due to misalignment.
Innovation Solution
An optical device with a compact form factor that includes multiple semiconductor laser chips to generate multiple laser beams at different wavelengths, utilizing lenses and optical isolators to achieve sub-micron level alignment tolerance, allowing for simultaneous alignment of multiple laser beams in a single step.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple laser emitters are used to provide multiple wavelengths, then the information capacity and performance of optical communications systems is enhanced, but the size of the optical device increases
Solution Approach 1:
Multiple laser emitters are integrated onto a single semiconductor chip substrate, merging what would traditionally be separate discrete components into one unified device. This integration maintains the ability to provide multiple wavelengths for enhanced information capacity while reducing the overall device size by eliminating the need for separate housings and alignment mechanisms for each individual laser emitter.
Solution Approach 2:
The semiconductor chip serves as a universal platform that hosts multiple laser emitters with different wavelengths, allowing a single device to perform multiple functions (providing multiple wavelengths) rather than requiring separate devices for each wavelength. This multi-functionality approach enables the chip to replace multiple discrete laser components.
2Adaptability or versatility
If multiple laser emitters are used to provide multiple wavelengths, then the information capacity of optical communications systems is enhanced, but the cost of the optical device increases
Solution Approach 1:
Multiple laser emitters are fabricated simultaneously on a single semiconductor chip using integrated circuit manufacturing processes, merging multiple components into one unit. This approach reduces the total number of discrete parts, assembly steps, and alignment procedures required, thereby lowering manufacturing costs despite providing multiple wavelengths for enhanced information capacity.
Solution Approach 2:
The semiconductor chip manufacturing process uses photolithography and other replication techniques to create multiple laser emitter structures simultaneously on the chip substrate. This copying approach during fabrication allows multiple functional elements to be produced in parallel, reducing per-unit costs compared to assembling multiple individually manufactured laser components.
3Adaptability or versatility
If multiple laser emitters are used to provide multiple wavelengths, then the information capacity of optical communications systems is enhanced, but the alignment complexity increases
Solution Approach 1:
Multiple laser emitters are positioned on a common semiconductor chip substrate with fixed relative positions, merging multiple alignment references into a single integrated platform. This eliminates the need for separate alignment procedures for each laser emitter, as their positions are predetermined by the chip fabrication process, thereby reducing alignment complexity while providing multiple wavelengths.
Solution Approach 2:
The relative positions of multiple laser emitters are pre-determined during the semiconductor chip fabrication process, performing the alignment function in advance during manufacturing rather than requiring complex alignment procedures during device assembly or installation. This preliminary positioning action simplifies the final device integration process.
4Volume of moving object
If the size of optical device is reduced to accommodate decreasing transceiver sizes, then the device fits better in modern transceivers, but the manufacturing precision requirements increase
Solution Approach 1:
Multiple laser emitters are integrated on a single semiconductor chip with their relative positions determined by the chip's internal structure, merging multiple components into one rigid unit. This integration maintains compact device size while reducing the cumulative alignment tolerances that would arise from assembling multiple separate components, as the chip's internal geometry provides inherent positional stability.
Solution Approach 2:
The mechanical alignment process traditionally required for positioning multiple discrete laser components is replaced by the semiconductor fabrication process, which uses photolithography and other precision manufacturing techniques to define component positions directly during chip creation. This substitution of mechanical assembly with semiconductor manufacturing processes achieves the required precision at a smaller scale.
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
The solution reduces the size and cost of optical devices while ensuring accurate alignment of multiple laser beams, enhancing the information capacity and performance of optical communications systems.
Implementation Method 1
The lens may be positioned to direct each laser beam, of the four laser beams, toward the respective optical output of the optical device
Implementation Method 2
The one or more lenses and the optical isolator may collectively introduce less than one micron of relative deflection to each of the first optical beam, the second optical beam, the third optical beam, and the fourth optical beam
Data Source
AI summary
An optical device may include a semiconductor laser chip to independently generate four laser beams at different wavelengths. Each laser beam, of the four laser beams, may be directed to a respective optical output of the optical device with a sub-micron level of tolerance of each laser beam relative to the respective optical outputs of the optical device, and each laser beam, of the four laser beams, may be associated with a different optical path from the semiconductor laser chip to the respective optical output of the optical device. The optical device may include a lens to receive each of the four laser beams. The lens may be positioned to direct each laser beam, of the four laser beams, toward the respective optical output of the optical device. The optical device may include an optical isolator to receive each of the four laser beams.