Nested Resonator Stabilizes Optical Signals Against Temperature Fluctuations

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Solution Overview

Problem

Photonic devices, particularly those using external continuous wave (CW) laser sources, face instability due to temperature fluctuations and electrical power variations, leading to unstable optical signals, which are exacerbated by the non-locality of the CW source and sensitivity to environmental changes.

Innovation Solution

The use of nested resonators with external and nested loops, each supporting a single resonant wavelength, coupled via internal interfaces, stabilizes optical signals by smoothing fluctuations and acting as directional couplers to maintain a stable input signal, functioning similarly to Coupled Resonator Optical Waveguides (CROW) with enhanced spectral filtering capabilities.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If external CW laser sources are used in photonic devices, then optical signals can be generated, but the signals become unstable due to temperature fluctuations and electrical power variations

Engineering Contradiction:

Improveoptical signal stabilityVSAvoidtemperature fluctuations and electrical power variations

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The nested resonator acts as an intermediary component between the external CW laser source and the output waveguide. It couples energy from the input waveguide through multiple loops (external and nested) that are sensitive to wavelength, thereby filtering out fluctuations and stabilizing the optical signal before it reaches the output.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The nested resonator structure provides feedback mechanisms where the nested loops couple energy back to the external loop. This feedback path allows the system to self-adjust and compensate for temperature fluctuations and electrical power variations, maintaining stable optical output.

Inventive Principle:

Principle #23Feedback

2Measurement precision

If nested resonators with multiple loops are used, then spectral filtering capabilities are enhanced, but device complexity increases

Engineering Contradiction:

Improvespectral filtering capabilityVSAvoidresonator structure complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent implements a nested resonator structure where smaller loops are positioned inside larger loops. The nested loops are coupled to the external loop through internal interfaces, creating a compact multi-loop system that achieves enhanced spectral filtering without proportionally increasing the overall device footprint or complexity.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The resonator is divided into multiple independent loops (external loop and nested loops), each supporting specific resonant wavelengths. This segmentation allows the system to achieve complex spectral filtering functionality by combining the effects of individual loops, while maintaining modular design that simplifies manufacturing.

Inventive Principle:

Principle #1Segmentation

3Use of energy by moving object

If nested loops with internal interfaces are used, then energy coupling between loops is enabled, but manufacturing precision requirements increase

Engineering Contradiction:

Improveenergy coupling efficiencyVSAvoidloop interface alignment precision

Core Design Contradiction:

Use of energy by moving objectVSManufacturing precision

Solution Approach 1:

The internal interfaces are strategically positioned at specific locations where the external and nested loops are closest to each other. By concentrating the coupling mechanism at these local points rather than requiring precise alignment along the entire loop structure, the design reduces overall manufacturing precision requirements while maintaining effective energy coupling.

Inventive Principle:

Principle #3Local quality

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 effectively decouples fluctuations in the input optical signal, producing a relatively stable output by self-adjusting energy transfer, offering improved stability and spectral filtering with reduced spatial requirements, suitable for high-volume, low-cost photonic devices.

Implementation Method 1

an input interface configured to couple energy between the input waveguide and the nested resonator, an output interface configured to couple energy between the nested resonator structure and the output waveguide

Methodology Applied

Scientific EffectEvanescent coupling:

Implementation Method 2

each loop independently having a length that supports a single resonant wavelength

Methodology Applied

Scientific EffectResonance: Resonance

Data Source

PatentUS9529153B2Optical apparatus including nested resonator

Publication Date: 2016.12.27 XYRATEX TECH LTD

AI summary

Apparatuses that include an input and output waveguide; and a nested resonator including at least an external loop and a nested loop positioned entirely inside the external loop, each loop independently having a length that supports a single resonant wavelength, the external loop further including: an input interface configured to couple energy between the input waveguide and the nested resonator, an output interface configured to couple energy between the nested resonator structure and the output waveguide, and an internal interface, the external loop and the nested loop configured to couple energy there between via the internal interface.