VCSEL Mode Matching with Integrated Lenses
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Solution Overview
Problem
Current wavelength division multiplexing (WDM) systems are costly and face challenges in efficiently mode matching light beams from multiple optical sources to a single optical waveguide, leading to variations in transmission capacity and power loss due to manufacturing tolerances and wavelength-dependent imaging.
Innovation Solution
A low-cost WDM system is developed using optical sources with integrated lenses to image light beams to a beam waist on an optical slab, coupled with wavelength-selective filters and reflective focusers, which redirect and re-image beams to create a multi-wavelength light beam for transmission, allowing for efficient multiplexing and demultiplexing with minimal power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional WDM systems use multiple optical sources without integrated lenses, then device complexity is reduced, but manufacturing precision deteriorates due to alignment tolerances and wavelength-dependent imaging variations
Solution Approach 1:
The patent combines the optical source and lens into a single integrated unit. Each optical source has its own dedicated lens that is optically coupled to it, eliminating the need for separate alignment of lenses and sources. This integration directly resolves the alignment tolerance issues while maintaining manageable device complexity through modular design.
Solution Approach 2:
The input optical body acts as an intermediary element that receives mode-matched beams from multiple integrated source-lens units. It provides a common interface that accommodates the output from each integrated unit, enabling multiplexing while maintaining manufacturing precision through the mode-matching capability of the optical body.
2Ease of manufacture
If optical sources without integrated lenses are used, then ease of manufacture is improved, but power loss increases due to mode mismatching variations
Solution Approach 1:
By integrating the lens with each optical source during the manufacturing process, the patent ensures consistent optical coupling and mode matching. This integration reduces power loss from mode mismatching while the modular integrated units can still be manufactured using standard processes, balancing ease of manufacture with performance.
Solution Approach 2:
The patent optimizes the lens parameters (focal length, aperture, curvature) for each integrated source-lens unit to achieve optimal mode matching to the optical body. By carefully selecting and adjusting these optical parameters during design and manufacturing, power loss is minimized while maintaining manufacturability through standardized optical components.
3Productivity
If optical sources with integrated lenses are used to image light beams to a beam waist, then transmission capacity is improved, but device complexity increases
Solution Approach 1:
The integration of lenses with optical sources creates compact source-lens units that maintain high transmission capacity through proper beam waist imaging. The modular nature of these integrated units allows them to be combined in arrays, scaling transmission capacity while managing complexity through repetition of standardized modules.
Solution Approach 2:
The patent uses the optical body to redirect beams in multiple dimensions, with reflective focusers and wavelength-selective filters operating in different spatial planes. This multi-dimensional beam manipulation enables high transmission capacity through efficient use of optical space while keeping individual component designs relatively simple.
4Manufacturing precision
If wavelength-selective filters and reflective focusers are used to redirect beams, then manufacturing precision is improved through consistent beam waist dimensions, but device complexity increases
Solution Approach 1:
The patent divides the optical system into distinct functional segments: integrated source-lens units for beam generation, wavelength-selective filters for wavelength separation, and reflective focusers for beam redirection. Each segment is optimized for its specific function, achieving consistent beam waist dimensions through modular design while managing overall complexity through functional decomposition.
Solution Approach 2:
The optical body serves multiple functions: it acts as a beam interface for mode matching, provides wavelength-selective filtering, and enables beam redirection through reflective focusers. This multi-functionality reduces the need for separate dedicated components, achieving manufacturing precision through a unified optical platform rather than multiple specialized elements.
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 system effectively increases transmission capacity by ensuring consistent beam waist dimensions and reduced power loss across different wavelengths, enabling efficient multiplexing and demultiplexing with improved alignment tolerances and cost-effectiveness.
Implementation Method 1
each with a lens designed to mode match light beams generated by an optical source to an optical body by imaging the generated light beam to a beam waist at a first surface of the optical body
Implementation Method 2
lens designed to mode match light beams generated by an optical source to an optical body
Implementation Method 3
wavelength-selective filters coupled to the first surface... The wavelength-selective filters reflect light at a first set of wavelengths and transmit light at a second set of wavelengths
Implementation Method 4
reflective focusers coupled to the opposing surface... The reflective focusers reflect and focus an incoming light beam
Implementation Method 5
The reflective focusers reflect and focus an incoming light beam to re-image the beam waist at a different wavelength-selective filter
Data Source
AI summary
An apparatus includes a first and second VCSEL, each with an integrated lens. The VCSELs emit a first light beam having first optical modes at first wavelengths and a second light beam having second optical modes at second wavelengths. The apparatus also has an optical block with a first and second surface, a mirror coupled to the second surface, and a wavelength-selective filter coupled to the first surface. The first integrated lens mode matches the first beam to the optical block, and the second integrated lens mode matches the second beam to the optical block such that the first beam and second beam each have substantially a beam waist with a beam waist dimension at the first and second input region, respectively. An exit beam that includes light from the first beam and the second beam is output from the second surface of the optical block.