Integrated Optical Coupler for PIC Alignment and Reflection Control
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Solution Overview
Problem
Existing optical coupling methods between waveguides and photonic integrated circuits (PICs) face challenges in accurate alignment and high optical reflection, leading to inefficiencies and noise interference.
Innovation Solution
The use of an integrated optical coupler with an optical diffraction grating mechanism, including a transparent or induced diffraction grating, an optical lens, and a Faraday rotator, to align and separate light wavelengths efficiently, reducing optical loss and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If direct optical coupling is used between waveguide and PIC, then coupling simplicity is maintained, but alignment accuracy deteriorates and optical reflection increases
Solution Approach 1:
An optical coupler is introduced as an intermediary component between the waveguide and PIC. This coupler includes a diffraction grating that separates incoming light into different wavelengths and directs them to specific connectors on the PIC, thereby improving alignment accuracy while managing optical reflection through structured light separation.
Solution Approach 2:
The optical coupling function is segmented into distinct components: the diffraction grating for wavelength separation, the optical lens for focusing, and the Faraday rotator for reflection management. This segmentation allows each component to optimize its specific function, improving overall alignment accuracy.
2Loss of energy
If direct optical coupling is used, then device simplicity is maintained, but optical loss increases due to reflection and misalignment
Solution Approach 1:
The optical coupler acts as a mediator that reduces optical loss by properly directing light wavelengths to their intended destinations. The diffraction grating separates wavelengths to prevent interference and misalignment losses, while the Faraday rotator specifically addresses reflection losses by rotating polarization.
Solution Approach 2:
The Faraday rotator changes the polarization parameter of the light by 45 degrees, transforming the light's state to minimize reflection at the interface. This parameter change directly reduces optical loss from reflection without requiring complex mechanical adjustments.
3Object-affected harmful factors
If direct optical coupling is used, then system simplicity is maintained, but noise interference increases from optical reflection
Solution Approach 1:
The Faraday rotator serves as a specialized intermediary that addresses reflection-induced noise. By rotating the polarization of reflected light by 45 degrees, it causes reflected light to be directed away from the optical path, thereby eliminating noise interference from reflections.
Solution Approach 2:
The Faraday rotator converts the harmful reflected light into a beneficial effect by rotating its polarization. The reflected light, which would normally cause noise, is instead redirected at an angle that removes it from the optical path, transforming a harmful factor into a solution.
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
Improves alignment and reduces optical loss by separating and focusing light beams onto specific connectors on the PIC, minimizing reflection and enhancing optical coupling efficiency.
Implementation Method 1
an optical diffraction grating mechanism... to align and separate light wavelengths efficiently
Implementation Method 2
a Faraday rotator... to align and separate light wavelengths efficiently, reducing optical loss and noise
Data Source
AI summary
Embodiments herein relate to systems, apparatuses, or processes directed to an integrated optical coupler that may be used to optically couple a waveguide and a PIC. In embodiments, the integrated optical coupler may include an optical diffraction grating mechanism, an optical lens, and a Faraday rotator. In embodiments, the integrated optical coupler may at least partially within a housing. Other embodiments may be described and/or claimed.