Automated Optical Fiber Characterization System

A system for automated characterization of optical fibers, measuring attenuation, dispersion, refractive index, and geometric parameters through integrated hardware control and Image analysis.

Table of Contents

1. System Architecture
2. Key Features
3. Class Diagram
4. Data Flow
5. Installation
6. Configuration
7. Usage
8. Results

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Demo & Screenshots

Screencast.From.2025-01-31.00-00-17.mp4

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System Architecture

graph TD
    A[Hardware] --> B(Laser Controller)
    A --> C(Photodetector)
    A --> D(Alignment Stage)
    B --> E[Core System]
    C --> E
    D --> E
    E --> F[Data Acquisition]
    E --> G[Signal Processing]
    E --> H[Image Analysis]
    F --> I[(Database)]
    G --> I
    H --> I
    I --> J[Dashboard]
    J --> K[Real-time Visualization]
    J --> L[Reports]

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Key Features

• Multi-parameter Measurement
• Automated Fiber Alignment
• Real-time Spectral Analysis
• AI-powered Defect Detection
• Professional Reporting

Class Diagram

classDiagram
    class FiberCharacterizationSystem{
        -LaserController laser
        -Photodetector detector
        -AlignmentSystem alignment
        +run_full_characterization()
        +analyze_fiber_image()
        +shutdown()
    }

    class LaserController{
        -visa_address: str
        -current_wavelength: float
        +set_wavelength()
        +get_power()
    }

    class FiberAnalyzer{
        -original_image: ndarray
        -processed_image: ndarray
        +detect_core_cladding()
        +calculate_mfd()
        +refractive_index_profile()
    }

    class SignalProcessor{
        +calculate_attenuation()
        +analyze_dispersion()
        +noise_analysis()
    }

    FiberCharacterizationSystem --> LaserController
    FiberCharacterizationSystem --> Photodetector
    FiberCharacterizationSystem --> FiberAnalyzer
    FiberCharacterizationSystem --> SignalProcessor

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Data Flow

sequenceDiagram
    participant User
    participant Dashboard
    participant CoreSystem
    participant Hardware

    User->>Dashboard: Start Characterization
    Dashboard->>CoreSystem: Initialize Parameters
    CoreSystem->>Hardware: Align Fiber
    Hardware-->>CoreSystem: Alignment Status
    CoreSystem->>Hardware: Spectral Sweep
    Hardware-->>CoreSystem: Power Measurements
    CoreSystem->>SignalProcessor: Analyze Data
    SignalProcessor-->>CoreSystem: Attenuation/Dispersion
    CoreSystem->>Database: Store Results
    Database-->>Dashboard: Update Visualization

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Installation

Requirements

• Python 3.9+
• NI-VISA Drivers
• OpenCV with Contrib Modules

git clone https://github.com/FakeCoder01/fiber-characterization-system.git
cd fiber-characterization-system
pip install -r requirements.txt

Configuration

Edit src/config/config.yaml:

hardware:
  laser:
    visa_address: GPIB0::12::INSTR
    min_wavelength: 1500
    max_wavelength: 1600
  detector:
    visa_address: GPIB0::15::INSTR

acquisition:
  interval: 0.1  # seconds
  sampling_rate: 1000  # Hz

analysis:
  core_threshold: 0.7
  cladding_threshold: 0.3

Usage

Dashboard

cd src/
python app.py

Serer started at : http://localhost:8050

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Results

Typical Outputs

Spectral Response

graph LR
    A[1550 nm] --> B(Peak Power)
    C[1565 nm] --> D(3dB Roll-off)

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MFD Measurement

pie title Mode Field Diameter
    "Core" : 8.2
    "Cladding" : 125

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Attenuation Curve

graph TD
    A[0 km] -->|0.2 dB/km| B[5 km]
    B -->|0.22 dB/km| C[10 km]
    C -->|0.25 dB/km| D[15 km]

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Troubleshooting

Issue	Solution
Hardware Connection Failed	Check VISA addresses and cables
Image Analysis Failure	Verify fiber is centered in image
Signal Noise Too High	Clean connectors, check laser stability