IEC 61280-1-4:2023 PDF

Fibre optic communication subsystem test procedures - Part 1-4: General communication subsystems - Light source encircled flux measurement method

First page of standard IEC 61280-1-4:2023

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Title (English):

IEC 61280-1-4:2023

Fibre optic communication subsystem test procedures - Part 1-4: General communication subsystems - Light source encircled flux measurement method

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 96
Publication date:: January 19, 2023
Edition:: IEC IS 61280 edition 3 version 1
ICS:: 33.180.01

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Description (English):

IEC 61280-1-4:2023 establishes the characterization process of the encircled flux measurement method of light sources intended to be used with multimode fibre. This document sets forth a procedure for the collection of two-dimensional fibre optic nearfield greyscale data and subsequent reduction to one-dimensional data expressed as a set of three sampled parametric functions of radius from the fibre’s optical centre. Estimation of the fibre core diameter is not an objective of this document. This third edition cancels and replaces the second edition published in 2009. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: - improvement of calibration procedure and calibration traceability; - improvement of fibre shaker description and requirements; - addition of pulsed light sources; - removal of a poorly traceable calibration process using a micro positioner.

Technical details

Technical committee: SC 86C - Fibre optic systems, sensing and active devices
SKU: IEC 61280-1-4:2023

Abstract

Overview

IEC 61280-1-4:2023 specifies the encircled flux measurement method for light sources used with multimode fibre. The standard defines a traceable procedure to collect two‑dimensional near‑field greyscale images of a fibre output and to reduce them to one‑dimensional radial functions describing the source launch: intensity, incremental flux, and encircled flux as functions of radius from the optical centre. Estimating fibre core diameter is explicitly not an objective. This third edition (2023) updates calibration, measurement hardware and computation methods to improve precision and traceability.

Key Topics

Measurement principle: capture calibrated 2D near‑field images and convert to three sampled radial functions (intensity, incremental flux, encircled flux).
Data reduction: specifies numerical processing (e.g., trapezoidal or higher‑order integration), ring width parameter, integration limit, and baseline subtraction to reduce DC drift and improve repeatability.
Apparatus and components: requirements for camera/detector, image digitizer, magnifying optics, attenuator, input port, calibration light source, fibre shaker, and test jumper assemblies.
Calibration and traceability: improved calibration procedures and traceability requirements to ensure reproducible encircled flux results; the 2023 edition removes poorly traceable micro‑positioner calibration processes and aligns geometric calibration with established methodologies (see references such as IEC 61745).
Pulsed sources: explicit inclusion of pulsed light sources in measurement scope and procedures.
Measurement workflow: raw and dark image acquisition, corrected images, optical‑centre (centroid) determination, and computation of encircled flux.

Applications

IEC 61280-1-4:2023 is used where controlled multimode launch characterization is required:

Manufacturers of multimode lasers, LEDs and transceivers for qualifying source launch conditions.
Test laboratories and calibration houses performing standardized encircled flux measurements and reporting.
System integrators and installers verifying launch conditions for consistent multimode link insertion‑loss measurements.
Standards bodies and R&D groups modeling multimode link performance (minimum guaranteed length) and validating simulation inputs.
Quality and acceptance testing of multimode components and links to ensure measurement reproducibility across instruments and sites.

Related Standards

IEC 61745 (geometric calibration methodology reference)
Other parts of the IEC 61280 series (fibre optic communication subsystem test procedures) for complementary test methods.

Keywords: IEC 61280-1-4:2023, encircled flux, multimode fibre, light source measurement, nearfield greyscale data, calibration traceability, fibre shaker, pulsed light sources, geometric calibration.

Related standards

Mentioned in the description and other IEC standards

Abstract

Overview

Key Topics

Measurement principle: capture calibrated 2D near‑field images and convert to three sampled radial functions (intensity, incremental flux, encircled flux).
Data reduction: specifies numerical processing (e.g., trapezoidal or higher‑order integration), ring width parameter, integration limit, and baseline subtraction to reduce DC drift and improve repeatability.
Apparatus and components: requirements for camera/detector, image digitizer, magnifying optics, attenuator, input port, calibration light source, fibre shaker, and test jumper assemblies.
Calibration and traceability: improved calibration procedures and traceability requirements to ensure reproducible encircled flux results; the 2023 edition removes poorly traceable micro‑positioner calibration processes and aligns geometric calibration with established methodologies (see references such as IEC 61745).
Pulsed sources: explicit inclusion of pulsed light sources in measurement scope and procedures.
Measurement workflow: raw and dark image acquisition, corrected images, optical‑centre (centroid) determination, and computation of encircled flux.

Applications

IEC 61280-1-4:2023 is used where controlled multimode launch characterization is required:

Manufacturers of multimode lasers, LEDs and transceivers for qualifying source launch conditions.
Test laboratories and calibration houses performing standardized encircled flux measurements and reporting.
System integrators and installers verifying launch conditions for consistent multimode link insertion‑loss measurements.
Standards bodies and R&D groups modeling multimode link performance (minimum guaranteed length) and validating simulation inputs.
Quality and acceptance testing of multimode components and links to ensure measurement reproducibility across instruments and sites.

Related Standards

IEC 61745 (geometric calibration methodology reference)
Other parts of the IEC 61280 series (fibre optic communication subsystem test procedures) for complementary test methods.

Keywords: IEC 61280-1-4:2023, encircled flux, multimode fibre, light source measurement, nearfield greyscale data, calibration traceability, fibre shaker, pulsed light sources, geometric calibration.

IEC 61280-1-4:2023 PDF

Technical details

Abstract

Overview

Key Topics

Applications

Related Standards

Related standards

Abstract

Overview

Key Topics

Applications

Related Standards

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