Deflector-Edge Coupler Structure for Broadband Optical Coupling
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Solution Overview
Problem
In system-on-a-chip (SoC) designs with a chiplet architecture, the optical coupling between photonic chiplets and optical transmitters/receivers is limited due to the wavelength sensitivity and polarization specificity of grating couplers, leading to reduced efficiency in optical signal transmission.
Innovation Solution
Incorporating a deflector structure adjacent to an edge coupler on the photonic chip, which redirects optical signals from a peripheral region to the edge coupler, enhancing coupling efficiency by being polarization independent and capable of receiving a wide range of wavelengths, thereby improving the optical coupling between the photonic chip and the optical transmitter/receiver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If grating couplers are used for optical coupling, then optical coupling is achieved, but wavelength sensitivity and polarization specificity reduce coupling efficiency
Solution Approach 1:
The patent introduces a deflector structure as an intermediary component between the optical fiber and the grating coupler. This deflector redirects optical signals that would otherwise be lost, directing them toward the grating coupler's effective coupling region. The deflector acts as a mediator that compensates for the grating coupler's wavelength and polarization sensitivity limitations by capturing and redirecting stray light across a broader range of conditions.
Solution Approach 2:
The patent adds a spatial dimension to the optical coupling system by introducing the deflector structure positioned at a specific location relative to the grating coupler. This deflector operates in a different spatial zone, capturing light from angles and positions that the grating coupler alone cannot effectively utilize, thereby expanding the system's operational versatility without changing the grating coupler's inherent properties.
2Reliability
If a deflector structure is added to increase optical coupling, then coupling efficiency improves, but device complexity increases
Solution Approach 1:
The patent divides the optical coupling function into two distinct segments: the grating coupler for primary coupling and the deflector structure for capturing and redirecting stray light. This segmentation allows each component to be optimized independently - the grating coupler for its wavelength-selective coupling and the deflector for broad-angle light redirection - while working together to overcome the limitations of either component alone.
Solution Approach 2:
The patent merges the grating coupler and deflector structure into an integrated optical coupling system. The deflector is positioned and configured to work in conjunction with the grating coupler, combining their functions to achieve superior overall coupling efficiency. This merging creates a synergistic system where the deflector compensates for the grating coupler's limitations without requiring a complete redesign of the coupling mechanism.
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 deflector structure and edge coupler configuration significantly increase optical coupling efficiency, reducing signal loss and enhancing the overall performance of the electronic system by ensuring effective transmission of optical signals across the SoC.
Implementation Method 1
the deflector structure is configured to redirect an optical signal traveling along a first direction to a second direction towards the edge coupler
Implementation Method 2
edge coupler is laterally adjacent to the deflector structure... the edge coupler comprises a plurality of optical core segments
Data Source
AI summary
Various embodiments of the present disclosure are directed towards a semiconductor device including a dielectric structure disposed on a first substrate. An edge coupler is disposed within the dielectric structure and comprises a plurality of optical core segments. A deflector structure is disposed within the dielectric structure and is laterally adjacent to the edge coupler. The deflector structure is configured to redirect an optical signal traveling along a first direction to a second direction towards the edge coupler.