PIC Waveguide Structure With Absorber Ridge for Unguided 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 waveguide structure is used to guide light between components, then light transmission is achieved, but unguided light escapes and causes noise in other components

Engineering Contradiction:

Improvenoise reductionVSAvoidunguided light noise

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent extracts and removes the harmful unguided light from the system by introducing an absorber ridge that specifically targets and absorbs light escaping from the waveguide, preventing it from reaching other components and causing noise

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent converts the harmful unguided light into a beneficial effect by using the absorber ridge to absorb the escaped light, transforming it from a noise source into a controlled energy dissipation mechanism that actually improves overall system performance

Inventive Principle:

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

2Ease of manufacture

If the waveguide structure is simplified, then manufacturing is easier, but noise from unguided light increases

Engineering Contradiction:

Improvewaveguide fabricationVSAvoidnoise detection

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent merges the waveguide structure with an absorber ridge in a single integrated component, combining the light guiding function with the light absorption function to simultaneously achieve easy manufacturing and effective noise reduction

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 reliability and performance of the photonic integrated circuits.

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

PatentUS12292595B2Waveguide structure for a photonic integrated circuit

Publication Date: 2025.05.06 SMART PHOTONICS HLDG BV

AI summary

A waveguide structure (IOO) 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).