Photonic Chip Delay-Line Structure for Optical Return Loss

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Solution Overview

Problem

Existing photonic chips lack efficient structures for photonic components and delay lines that optimize light manipulation and signal conversion, leading to suboptimal performance in data communication and computation systems.

Innovation Solution

A photonic chip structure featuring waveguide cores with varying lengths and tapered sections, coupled with a photodetector, to achieve controlled light splitting, reflection, and phase difference for destructive interference, enhancing signal processing efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If waveguide cores with varying lengths are used to create delay lines, then phase difference and destructive interference are optimized for signal processing, but device complexity increases

Engineering Contradiction:

Improvesignal processing efficiencyVSAvoidwaveguide core structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The waveguide core is divided into multiple sections with different lengths (first section with first length, second section with second length greater than first length). This segmentation creates distinct delay lines that generate controlled phase differences, enabling destructive interference to minimize optical return loss while maintaining manageable structural complexity through modular design

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different sections of the waveguide core are designed with locally optimized properties - the first section has length L1 and the second section has length L2 > L1. This local differentiation creates the necessary phase differences for signal processing while each section can be manufactured using standardized processes, balancing performance requirements with manufacturing feasibility

Inventive Principle:

Principle #3Local quality

2Reliability

If photonic components are integrated with delay lines, then light manipulation performance is improved, but manufacturing precision requirements increase

Engineering Contradiction:

Improvelight manipulation performanceVSAvoidwaveguide core fabrication

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The design focuses on changing the length parameter of waveguide core sections (L1 and L2 where L2 > L1) rather than requiring complex geometric variations. This parameter-based approach simplifies manufacturing precision requirements while achieving the necessary phase differences for improved light manipulation and destructive interference to reduce optical return loss

Inventive Principle:

Principle #35Parameter changes

3Loss of energy

If tapered sections are added to waveguide cores, then optical return loss is minimized through destructive interference, but device complexity increases

Engineering Contradiction:

Improveoptical return lossVSAvoidwaveguide core structure

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The waveguide core is segmented into multiple sections with specific length relationships (first section length L1, second section length L2 > L1). This segmentation creates the necessary path length differences for destructive interference of reflected light, minimizing optical return loss while maintaining relatively simple structural elements that can be manufactured with standard precision

Inventive Principle:

Principle #1Segmentation

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 structure improves light manipulation and signal conversion by minimizing optical return loss and optimizing phase differences, resulting in enhanced performance in data communication and computation systems.

Implementation Method 1

The section of the first waveguide core has a first length, and the section of the second waveguide core has a second length that is greater than the first length

Methodology Applied

Scientific EffectPhase difference:

Implementation Method 2

achieve controlled light splitting, reflection, and phase difference for destructive interference, enhancing signal processing efficiency

Methodology Applied

Scientific EffectDestructive interference: Interference

Implementation Method 3

A photodetector may be employed in the photonic integrated circuit to convert light, which may be modulated as an optical signal, into an electrical signal

Methodology Applied

Scientific EffectPhotoelectric conversion: Photoelectric Effect

Data Source

PatentUS20260016631A1Photonic chips including a photonic component and delay lines

Publication Date: 2026.01.15 GLOBALFOUNDRIES US INC

AI summary

Structures for a photonic chip that include a photonic component and delay lines and methods of forming such structures. The structure comprises a photonic component, a first waveguide core including a section coupled to the photonic component, and a second waveguide core including a section coupled to the photonic component. The section of the first waveguide core has a first length, and the section of the second waveguide core having a second length that is greater than the first length.