Polymer Modulator Layout With Passive Core Adiabatic Coupling

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Solution Overview

Problem

Prior art polymer ridge waveguides with active regions have inefficient optical coupling and require tight tolerances, leading to increased costs and reduced efficiency due to direct input and output coupling with optical fibers and free space light, and the active material is exposed to the atmosphere, affecting reliability.

Innovation Solution

An active region-less polymer modulator design featuring a passive core region with shaped electro-optic polymer active components confined within the chip, utilizing adiabatic transitions for efficient optical coupling and protected from external environmental factors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the active region layer transverses the complete modulator structure for direct light input and output, then the modulator structure is simple, but the optical coupling efficiency is poor and requires tight tolerances

Engineering Contradiction:

Improvemodulator structureVSAvoidoptical coupling efficiency

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The modulator structure is segmented into three distinct regions: input coupling region with passive core, modulation region with active electro-optic polymer, and output coupling region with passive core. This segmentation allows each region to be optimized for its specific function, achieving efficient optical coupling at interfaces while maintaining modulation capability in the active region.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Passive core regions are introduced as intermediary elements between the external optical fibers and the active electro-optic polymer region. These passive cores serve as transition zones that facilitate efficient light coupling into and out of the active region without requiring the active material to be exposed at the chip edges.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If the active region layer transverses the complete modulator structure, then the manufacturing process is simple, but the active material is exposed to the atmosphere affecting reliability

Engineering Contradiction:

Improveactive region fabricationVSAvoidactive material stability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The active electro-optic polymer is extracted from the edge-exposed configuration and relocated to a central modulation region completely surrounded by passive core and cladding layers. This extraction protects the active material from atmospheric exposure while maintaining its modulation function.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The active electro-optic polymer region is nested within the passive core structure, which itself is enclosed by cladding layers. This nested configuration creates multiple protective barriers that shield the active material from environmental factors while allowing light to pass through the passive core to reach the active region.

Inventive Principle:

Principle #7Nested doll (Nesting)

3Device complexity

If the active region layer transverses the complete modulator structure, then the structure is straightforward, but optical reflections and surface effects affect light transmission

Engineering Contradiction:

Improvewaveguide structureVSAvoidoptical reflections

Core Design Contradiction:

Device complexityVSObject-generated harmful factors

Solution Approach 1:

Passive core regions serve as intermediary transition zones between the external optical environment and the active electro-optic polymer. These passive cores provide smooth optical transitions that reduce reflections and minimize surface effects on light transmission to and from the active region.

Inventive Principle:

Principle #24Intermediary (Mediator)

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

Enhances optical coupling efficiency and reliability by preventing exposure to external factors, reducing optical reflections, and allowing for larger tolerances in alignment with optical fibers.

Implementation Method 1

the shaped electro-optic polymer active component being polled to align dipoles and promote modulation of light

Methodology Applied

Scientific EffectElectro-optic effect: Electro-Optic Effects

Implementation Method 2

designed to produce adiabatic transition of light waves traveling in the passive core region into the shaped electro-optic polymer active component

Methodology Applied

Scientific EffectAdiabatic transition: Adiabatic Heating

Data Source

PatentUS12535700B2Active region-less modulator and method

Publication Date: 2026.01.27 LIGHTWAVE LOGIC INC

AI summary

A polymer modulator includes a first cladding layer, a passive core region with a surface abutting a surface of the first cladding layer, the passive core region extending to define an optical input and an optical output for the modulator, a shaped electro-optic polymer active component with a surface abutting a surface of a central portion of the passive core region, the shaped electro-optic polymer active component being polled to align dipoles and promote modulation of light, the shaped electro-optic polymer active component having a length that extends only within a modulation area defined by modulation electrodes, and a second cladding layer enclosing the shaped electro-optic polymer active component and designed to produce adiabatic transition of light waves traveling in the passive core region into the shaped electro-optic polymer active component to travel the length of the shaped electro-optic polymer active component and return to the passive core region.