Chirped Bragg Grating Waveguides for Anomalous Dispersion Comb Generation

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Solution Overview

Problem

Existing optical frequency comb generation systems face challenges in achieving anomalous dispersion, particularly in integrated photonics platforms, which limits the ease of implementing optical frequency combs in various applications.

Innovation Solution

An optical frequency comb generation system utilizing a uniform optical waveguide with first and second chirped Bragg gratings, each with distinct periodic variations and refractive indices, to create cavities with wavelength-dependent cavity lengths, inducing anomalous dispersion and generating optical frequency combs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional optical waveguide platforms are used to generate optical frequency combs, then the system requires anomalous dispersion condition, but this creates strict constraints on waveguide platform selection and reduces ease of implementation

Engineering Contradiction:

Improveoptical frequency comb generationVSAvoidease of implementation

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent changes the dispersion parameter by introducing chirped Bragg gratings with specific chirp rates into the waveguide platform. This allows the system to achieve anomalous dispersion through the grating structure parameters rather than relying on inherent waveguide dispersion properties, thereby enabling optical frequency comb generation in platforms that would otherwise not satisfy the anomalous dispersion condition.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The chirped Bragg gratings act as an intermediary element that mediates between the waveguide platform and the optical frequency comb generation requirement. Instead of requiring the waveguide itself to provide anomalous dispersion, the gratings serve as an intermediate structure that creates the necessary dispersion conditions through their wavelength-dependent reflection characteristics.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If chirped Bragg gratings are used to create cavities with wavelength-dependent cavity lengths, then anomalous dispersion is induced for optical frequency comb generation, but the device structure becomes more complex

Engineering Contradiction:

Improveanomalous dispersion generationVSAvoidwaveguide structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments the waveguide structure by introducing discrete chirped Bragg grating regions at specific locations within the waveguide. Rather than requiring the entire waveguide to have complex dispersion-engineered geometry, the dispersion functionality is segmented into specific grating sections that can be independently designed and fabricated, reducing overall structural complexity.

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 system effectively generates optical frequency combs by maintaining significant energy in the comb and minimizing energy losses, enabling their formation in diverse platforms with low propagation loss.

Implementation Method 1

a first chirped Bragg grating disposed at a first end of the uniform optical waveguide portion, and a second chirped Bragg grating disposed at a second end of the uniform optical waveguide portion

Methodology Applied

Scientific EffectBragg reflection: Bragg Diffraction

Implementation Method 2

An optical frequency comb generation system is typically configured to exhibit an anomalous dispersion to generate optical frequency combs. An anomalous dispersion occurs when the second derivative index of refraction with respect to a wavelength of a light beam has a negative value

Methodology Applied

Scientific EffectAnomalous dispersion: Dispersion (of waves)

Implementation Method 3

A first cavity associated with a first resonant frequency extends between the first periodic variation of the first chirped Bragg grating and the first periodic variation of the second chirped Bragg grating

Methodology Applied

Scientific EffectOptical resonance: Resonance

Data Source

PatentEP4354218B1System and method for generating optical frequency combs using an optical waveguide including chirped bragg gratings

Publication Date: 2026.03.18 HONEYWELL INTERNATIONAL INC

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AI summary

An optical frequency comb generation system includes an optical waveguide portion having a uniform width, a first chirped Bragg grating disposed at one end of the optical waveguide portion and a second chirped Bragg grating disposed at the other end of the optical waveguide portion. The first chirped Bragg grating includes at least a first periodic variation having a first refractive index and a second periodic variation having a second refractive index. The second chirped Bragg grating includes the at least first and second periodic variations. A first cavity associated with a first resonant frequency extends between the first periodic variation of the first chirped Bragg grating and the first periodic variation of the second chirped Bragg grating. A second cavity associated with a second resonant frequency extends between the second periodic variation of the first chirped Bragg grating and the second periodic variation of the second chirped Bragg grating.