Laser Polishing of Optical Fiber End Faces for Shape Control

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Solution Overview

Problem

The costly and time-consuming process of mechanically polishing optical fiber end faces for connectorization in telecommunications systems, which often leaves debris and requires multiple steps to achieve sufficient quality and low mating loss.

Innovation Solution

A laser polishing apparatus that adjusts parameters such as laser fluence, duty cycle, and exposure time to shape the optical fiber end face, eliminating the need for mechanical polishing and reducing processing time and cost by using a laser beam with a focused diameter ratio between 1:1 and 10:1, and emitting bursts at frequencies between 1 Hz and 200 kHz.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If mechanical polishing is used to polish the optical fiber end face, then the end face quality can be improved, but the processing time and cost increase significantly

Engineering Contradiction:

Improveend face qualityVSAvoidprocessing time

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The patent replaces the mechanical polishing system with a laser-based system. The laser beam is focused to a spot size of 1-10 micrometers and scanned across the optical fiber end face to achieve polishing without mechanical contact, thereby eliminating the time-consuming mechanical polishing steps while maintaining end face quality

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the processing parameter from mechanical force to laser energy parameters (wavelength, power, pulse duration, scanning speed). By optimizing these laser parameters, the system achieves effective end face treatment with reduced processing time and without the debris generation associated with mechanical polishing

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If mechanical polishing is used to achieve low mating loss, then the connection quality can be improved, but multiple polishing steps and cleaning steps are required

Engineering Contradiction:

Improvemating lossVSAvoidnumber of processing steps

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent combines multiple separate processing steps (polishing, cleaning, inspection) into a single integrated laser treatment process. The laser system performs all necessary end face modifications in one operation, eliminating the need for separate mechanical polishing steps and final cleaning steps, thereby reducing process complexity while achieving low mating loss

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The laser-based approach replaces the multi-step mechanical polishing and cleaning process with a single non-contact laser treatment that simultaneously achieves the desired end face geometry and cleanliness, eliminating the need for ferrule insertion and bonding before polishing

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Productivity

If laser polishing is used to reduce processing time, then the productivity can be improved, but the control of end face shape becomes challenging

Engineering Contradiction:

Improveprocessing timeVSAvoidend face shape control

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent employs dynamic control of the laser system, including adjustable scanning speeds, variable power levels, and real-time parameter modification during the polishing process. This dynamic capability allows precise control of material removal rates and heat distribution, enabling accurate end face shape control while maintaining high processing speeds

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system incorporates feedback mechanisms to monitor and control the laser polishing process, ensuring precise end face shape control. By monitoring process parameters and adjusting laser settings in real-time, the system achieves consistent geometric outcomes without sacrificing productivity

Inventive Principle:

Principle #23Feedback

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 laser polishing apparatus effectively shapes the optical fiber end face with controlled radius of curvature between 100 microns and 10 mm, reducing processing time and cost while ensuring cleanliness and minimizing the risk of core diffusion or sagging, thus improving the efficiency of optical connectivity.

Implementation Method 1

a laser emitting a laser beam... the laser beam provides a laser treatment of the end face of the optical fiber

Methodology Applied

Scientific EffectLaser heating: Laser

Implementation Method 2

the laser beam has a beam diameter... wherein the laser beam provides a laser treatment of the end face of the optical fiber

Methodology Applied

Scientific EffectMelting: Melting

Data Source

PatentUS20230117462A1Laser polishing of an optical fiber with control of end face shape of optical fiber

Publication Date: 2023.04.20 CORNING RES & DEV CORP

AI summary

The present disclosure relates to a laser polishing apparatus where the laser beam emitted by the laser polishing apparatus can be configured to control the shape of the optical fiber end face. Stated another way, the laser polishing apparatus parameters can be adjusted such that the laser beam emitted can polish the optical fiber end face into a particular shape.