Optical Transceiver Visible Light Source for Safe Fiber Connection

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Solution Overview

Problem

In optical transceivers, operators face challenges in confirming whether light reaches the end of optical fibers during connection detection without exposing themselves to laser light, which can be hazardous.

Innovation Solution

Incorporating a visible light source, such as a light-emitting diode (LED), that emits diffused visible light when the laser light source is stopped due to detected optical input interruption, allowing operators to visually confirm fiber connectivity while protecting their eyes from laser exposure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If laser light source is used for connection detection, then detection precision is improved, but harmful factors increase due to eye safety risks

Engineering Contradiction:
Improveconnection detection precisionVSAvoideye safety risk
Core Design Contradiction:
Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

A visible light source (LED) is introduced as an intermediary device to enable safe visual inspection of fiber optic connections. The LED emits visible light that travels through the optical fiber, allowing operators to see light at the far end without exposing themselves to hazardous laser radiation. This intermediary visible light source bridges the gap between needing precise connection detection and maintaining operator safety.

Inventive Principle:
Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent uses visible light as a safe copy or substitute for laser light in the context of connection verification. Instead of directly observing laser light which is invisible and dangerous, the system uses visible light that behaves similarly in terms of propagation through the fiber but is safe for human observation. This copying approach allows operators to verify connection integrity without direct laser exposure.

Inventive Principle:
Principle #26Copying

2Object-affected harmful factors

If visible light source is added for safety, then eye safety is improved, but device complexity increases

Engineering Contradiction:
Improveeye safetyVSAvoidtransceiver structure
Core Design Contradiction:
Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The visible light source is designed to serve multiple functions: it enables safe visual inspection of fiber connections, provides connection verification capability, and can potentially assist in fault localization. By making the safety feature multi-functional, the patent justifies the added device complexity through multiple benefits rather than a single safety function.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system enables operators to perform self-inspection and self-verification of fiber connections using the visible light source. Operators can independently check connection integrity and identify issues without requiring specialized equipment or expert intervention, making the system self-servicing in terms of connection verification and safety monitoring.

Inventive Principle:
Principle #25Self-service

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

Enables safe and efficient detection of optical fiber connectivity issues by allowing operators to visually verify light presence at fiber ends without direct exposure to hazardous laser light, facilitating rapid maintenance and reducing the risk of eye damage.

Implementation Method 1

a photodetector configured to receive a second optical signal via the optical transmission member

Methodology Applied
Scientific EffectPhotoelectric effect: Photoelectric Effect

Implementation Method 2

a visible light source configured to emit visible light which is incident to the optical transmission member

Methodology Applied
Scientific EffectLight emitting diode effect: Light Emitting Diode

Data Source

PatentUS10326528B2Optical transceiver and control method for optical transceiver
Publication Date: 2019.06.18 FUJITSU LTD
  • US10326528B2 patent drawing
  • US10326528B2 patent drawing
  • US10326528B2 patent drawing

AI summary

There is provided an optical transceiver including a laser light source configured to transmit a first optical signal via an optical transmission member having optical fibers, a photodetector configured to receive a second optical signal via the optical transmission member, a visible light source configured to emit visible light which is incident to the optical transmission member, and a control circuit configured to, when the photodetector detects not to receive the second optical signal, control the laser light source to stop transmitting the first optical signal and the visible light source to start emitting the visible light.