Polymer Waveguide Connector Assembly with Partially Exposed Cores
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Solution Overview
Problem
Existing methods for connecting polymer waveguides to silicon photonic circuits face challenges in achieving low-loss coupling and precise alignment, particularly in single-mode applications, due to issues with contamination and modal dispersion.
Innovation Solution
The method involves preparing a polymer waveguide sheet with partially exposed cores and cladding, using ultraviolet cut dicing tapes to prevent contamination, and aligning the polymer waveguide array with a silicon waveguide array to achieve adiabatic coupling, which allows for efficient light transmission with high-precision positioning and reduced loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the polymer waveguide sheet is exposed to air during fabrication, then the fabrication process is simpler, but the surface becomes contaminated with atmospheric particles
Solution Approach 1:
A controllable atmosphere environment (nitrogen or vacuum) is introduced as an intermediary between the polymer waveguide sheet and atmospheric contaminants. This allows the waveguide surface to remain clean during fabrication without requiring complex cleanroom facilities, as the harmful atmospheric factors are excluded through pressure differential and gas flow control
2Ease of operation
If the waveguide core is fully exposed for connection, then alignment with silicon photonic circuits is easier, but contamination risk increases
Solution Approach 1:
The atmosphere control is applied locally only to the region where the polymer waveguide sheet contacts the silicon photonic circuit substrate. This localized atmosphere barrier allows the waveguide core to be partially exposed for alignment while preventing contamination in the critical connection region through selective atmosphere application
3Device complexity
If conventional coupling methods are used, then the connection process is simpler, but transmission loss is higher
Solution Approach 1:
An atmosphere barrier is established in advance before the polymer waveguide sheet contacts the silicon photonic circuit substrate. This preliminary protective action prevents contamination that would cause modal dispersion and transmission loss, enabling the use of simple conventional coupling methods while achieving low-loss transmission through contamination prevention
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 highly efficient adiabatic coupling between polymer waveguides and silicon photonic circuits, reducing loss and preventing contamination during the fabrication process, thereby enhancing the reliability and fidelity of optical connections.
Implementation Method 1
placing the partially exposed cores of the PWG sheet on the first dicing tape to prevent the surface of the PWG sheet from atmospheric contaminations, the first dicing tape being an ultraviolet (UV) cut type dicing tape
Implementation Method 2
aligning the polymer waveguide array with a silicon waveguide array to achieve adiabatic coupling, which allows for efficient light transmission with high-precision positioning and reduced loss
Implementation Method 3
When an optical signal in the inner core layer hits a boundary between core and clad, it is internally reflected instead of escaping from the core layer
Data Source
AI summary
A method of fabricating a polymer waveguide (PWG) is presented. The method includes preparing a polymer waveguide (PWG) sheet having a surface with partially exposed cores and partially exposed cladding, the cladding covering the cores and preparing a first dicing tape, the first dicing tape being an ultraviolet (UV) cut type dicing tape defining separation lines on a back side thereof. The method further includes placing the partially exposed cores of the PWG sheet on the first dicing tape to prevent the surface of the PWG sheet from atmospheric contaminations and placing a tape side of the first dicing tape attached to the PWG sheet on a second dicing tape.