PIC Waveguide Structure With Absorber Ridge for Stray Light Noise

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Solution Overview

Problem

Unguided light in Photonic Integrated Circuits (PICs) acts as a source of noise for other components, leading to undesirable detection and influence on light amplification within the waveguide structure.

Innovation Solution

The waveguide structure incorporates a semiconductor optical amplifier (SOA) design with an absorber ridge that absorbs unguided light, preventing it from escaping and causing noise in other components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional waveguide structure is used to guide light between PIC components, then light transmission is achieved, but unguided light escapes and creates noise in other components

Engineering Contradiction:

Improvenoise reductionVSAvoidunguided light noise

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful unguided light into a beneficial effect by introducing an absorber ridge that specifically absorbs escaped light. The absorber ridge transforms the harmful noise-causing unguided light into absorbed energy, preventing it from interfering with other PIC components while maintaining the core waveguide's light transmission function

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The absorber ridge acts as an intermediary element between the waveguide core and surrounding PIC components. It intercepts and absorbs unguided light before it can reach other components, serving as a mediator that eliminates noise without affecting the primary light transmission function of the waveguide

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the waveguide structure is expanded to include noise reduction features, then noise from unguided light is reduced, but the device complexity increases

Engineering Contradiction:

Improvenoise reductionVSAvoidwaveguide structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The absorber ridge is merged with the waveguide structure itself, forming an integrated noise reduction feature rather than a separate component. This combining approach reduces device complexity by eliminating the need for additional separate noise reduction elements while still achieving the desired noise filtration effect

Inventive Principle:

Principle #5Merging (Combining)

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 solution effectively reduces noise in PICs by absorbing unguided light, thereby improving the operational reliability and accuracy of the photonic devices.

Implementation Method 1

The waveguide structure incorporates a semiconductor optical amplifier (SOA) design with an absorber ridge that absorbs unguided light

Methodology Applied

Scientific EffectAbsorption (EM radiation): Absorption (EM radiation)

Data Source

PatentEP4066029B1Waveguide structure for a photonic integrated circuit

Publication Date: 2025.02.19 SMART PHOTONICS HLDG BV

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Figure 1b
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AI summary

A waveguide structure (100) for a photonic integrated circuit, comprising: a substrate; an active region (102) comprising a diode junction, the active region comprising: a light emission portion (102a) to emit light in a first direction and a second direction perpendicular the first direction; and a light absorption portion (102b) to absorb light emitted from the light emission portion (102a) in the second direction; a first contact corresponding to the light emission portion (102a); and a second contact corresponding to the light absorption portion (102b).