Waveguide Interferometer Light Intensity Compensation

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Solution Overview

Problem

Conventional waveguide type optical interferometer circuits, such as Mach-Zehnder interferometers and arrayed waveguide gratings, face instability and deterioration due to high optical signal intensity, leading to variations in optical characteristics and transmission losses, especially in high-intensity light applications like optical communication and spectroscopy.

Innovation Solution

Incorporating a light intensity compensating region with a material having a different light intensity coefficient into the optical branching or coupling units of the waveguide type optical interferometer circuit, which balances the optical distance changes caused by high light intensity, using materials like polysiloxane for effective refractive index compensation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If high optical signal intensity is used in waveguide type optical interferometer circuits, then the optical communication capacity and detection sensitivity are improved, but the optical characteristics become unstable and transmission losses increase

Engineering Contradiction:

Improveoptical signal intensityVSAvoidoptical characteristic stability

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The patent introduces a light intensity compensating region with a material having a different light intensity coefficient (different dn/dI value) to change the optical parameter distribution. This compensates for the nonlinear refractive index changes caused by high optical signal intensity, thereby maintaining stable optical characteristics while allowing high power operation.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The light intensity compensating region acts as an intermediary element between the input waveguide and the interferometer components. It mediates the effect of high optical signal intensity by introducing opposite nonlinear phase changes that cancel out the harmful effects in the main optical path.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If high optical signal intensity is input to the waveguide, then the communication capacity is enhanced, but the optical distance changes causing characteristic variations

Engineering Contradiction:

Improvecommunication capacityVSAvoidoptical path length stability

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The compensating region changes the optical parameter (refractive index) in response to optical signal intensity changes. By selecting a material with a different light intensity coefficient, the patent creates a compensating effect that counteracts the optical distance changes in the main waveguide path, maintaining precise optical path length stability even under high power conditions.

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If conventional waveguide materials are used, then the device structure is simple, but the optical characteristics deteriorate under high light intensity

Engineering Contradiction:

Improvewaveguide structure complexityVSAvoidoptical characteristic stability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent employs a composite structure combining conventional waveguide materials with a light intensity compensating material having different optical properties. This composite approach maintains the simplicity of conventional waveguides while adding the functionality of nonlinear phase compensation to maintain reliability under high power conditions.

Inventive Principle:

Principle #40Composite materials

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 configuration reduces the dependency of optical circuit characteristics on signal intensity, enhancing stability and maintaining optimal optical phase differences, thereby improving the performance and reliability of the interferometer circuits under high-intensity light conditions.

Implementation Method 1

a light intensity compensating region with a material having a different light intensity coefficient into the optical branching or coupling units of the waveguide type optical interferometer circuit, which balances the optical distance changes caused by high light intensity

Methodology Applied

Scientific EffectLight intensity coefficient compensation: Kerr Effect

Data Source

PatentEP3757633B1Waveguide type optical interferometer circuit

Publication Date: 2024.04.03 NIPPON TELEGRAPH & TELEPHONE CORP

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AI summary

A dependency of a characteristic of an optical circuit on an optical signal intensity occurring due to input of a high intensity optical signal is reduced in a waveguide type optical interferometer circuit. The waveguide type optical interferometer circuit is a waveguide type optical interferometer circuit formed in one plane, and includes an input waveguide, an optical branching unit, an optical coupling unit, an output waveguide, and optical waveguides having different lengths from each other and being interposed between the optical branching unit and the optical coupling unit. A light intensity compensating region is formed on an optical path extending from the optical branching unit to the optical coupling unit, and the light intensity compensating region is formed by using a light intensity compensating material having a light intensity coefficient different from a light intensity coefficient of an optical distance relative to an incident light intensity in the optical path.