Optical Fiber Switching With Side-Polished Couplers

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Solution Overview

Problem

Existing optical fiber switching methods in optical communication networks require communication stoppages due to cutting and splicing, leading to significant downtime.

Innovation Solution

An optical fiber switching method that forms an optical coupler by polishing the side surfaces of optical fibers to couple them without cutting, allowing seamless transition between communication devices using an optical coupler.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If optical fiber switching is performed by cutting and fusion splicing, then reliable connection is achieved, but communication stop time increases

Engineering Contradiction:

Improveconnection reliabilityVSAvoidcommunication stop time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The optical coupler is constructed in advance by polishing side surfaces and coupling optical fibers before the actual switching operation. This preliminary preparation allows the switching to be completed simply by changing connection paths, eliminating the need for cutting and splicing during the switching moment itself, thus reducing communication stop time while maintaining reliable connection through the pre-established optical coupler.

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If optical fiber is cut and spliced for switching, then device replacement is achieved, but service continuity deteriorates

Engineering Contradiction:

Improvedevice replacement capabilityVSAvoidservice continuity

Core Design Contradiction:

Adaptability or versatilityVSDuration of action of stationary object

Solution Approach 1:

The optical coupler serves as an intermediary device that enables switching between different optical communication devices without requiring direct cutting and splicing of the main optical fiber line. By introducing this intermediate coupling structure, device replacement can be performed by simply changing connection paths through the optical coupler, thereby maintaining service continuity while achieving the required adaptability for device replacement.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If optical coupler is constructed by polishing side surfaces, then connection reliability is improved, but manufacturing complexity increases

Engineering Contradiction:

Improveoptical coupler connection reliabilityVSAvoidoptical coupler manufacturing ease

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The optical coupler construction process is segmented into distinct steps: side surface polishing, positioning alignment, and coupling fixation. By dividing the manufacturing process into these manageable segments, each step can be optimized independently - the polishing step ensures reliable optical contact, while the positioning and fixation steps ensure proper alignment. This segmentation makes the overall manufacturing process more controllable and easier to standardize, reducing the practical manufacturing complexity despite the precision requirements.

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

Reduces communication downtime by enabling optical fiber switching without interrupting service, maintaining continuous communication through the optical coupler.

Implementation Method 1

bringing polishing surfaces of the first optical fiber and the second optical fiber close to each other to form an optical coupler that couples the first optical fiber and the second optical fiber

Methodology Applied

Scientific EffectTotal internal reflection: Total Internal Reflection

Data Source

PatentUS20250306288A1Optical fiber switching method

Publication Date: 2025.10.02 NIPPON TELEGRAPH & TELEPHONE CORP

AI summary

An object of the present disclosure is to reduce a communication stop time that occurs with optical fiber switching.The present disclosure is an optical fiber switching method for switching a communication partner of a first optical communication device connected to a first optical fiber from a second optical communication device connected to the first optical fiber to a third optical communication device connected to a second optical fiber, the method including: polishing each of side surfaces of the first optical fiber and the second optical fiber to a vicinity of a core; bringing polishing surfaces of the first optical fiber and the second optical fiber close to each other to form an optical coupler that couples the first optical fiber and the second optical fiber; and switching from the first optical fiber to the second optical fiber, using the optical coupler.