IEC 61300-3-31-2003 PDF

Full title and description

Fibre optic interconnecting devices and passive components — Basic test and measurement procedures — Part 3‑31: Examinations and measurements — Coupled power ratio measurement for fibre optic sources. This IEC publication defines the method to measure the coupled power ratio (CPR) coefficient for multimode fibre sources (commonly at 850 nm and 1 300 nm) and provides the procedure, apparatus and specification details needed to characterise sources and to standardize launch conditions for multimode attenuation and insertion‑loss testing.

Abstract

This part of IEC 61300 specifies a standardized procedure for determining the coupled power ratio (CPR) of fibre‑optic light sources. The CPR result can be used to characterise source launch behaviour and to set repeatable launch conditions for attenuation and insertion‑loss measurements (for example, in conjunction with IEC 61300‑3‑4). The standard covers the measurement wavelengths, required test launch arrangements, apparatus/terminations and information to be recorded.

General information

• Status: Withdrawn (withdrawal recorded by IEC in December 2008).
• Publication date: 6 February 2003 (edition 1.0).
• Publisher: International Electrotechnical Commission (IEC); adopted as EN 61300‑3‑31 and published by CENELEC/ national bodies.
• ICS / categories: 33.180.20 (Fibre optic interconnecting devices and passive components).
• Edition / version: Edition 1.0 (2003).
• Number of pages: 15 pages (IEC published file/paginated document).

Scope

Specifies the method to measure the coupled power ratio (CPR) coefficient of multimode fibre‑optic light sources at the primary test wavelengths (850 nm and 1 300 nm). The procedure defines required apparatus (source, reference/detector arrangements, temporary joints), launch and termination arrangements, measurement sequence and the essential details to be recorded so that CPR values can be used to define and reproduce launch conditions for subsequent attenuation and insertion‑loss tests (for example those described in IEC 61300‑3‑4).

Key topics and requirements

• Definition and purpose of the coupled power ratio (CPR) coefficient for multimode sources.
• Measurement wavelengths commonly specified: 850 nm and 1 300 nm.
• Apparatus and test configuration: reference launch/power meter arrangement, temporary joints/launch fibres, terminations and detector requirements.
• Detailed procedure and sequence to obtain reproducible CPR values and how to report results and uncertainties.
• Requirements for specifying launch conditions (to be used as input for attenuation/insertion‑loss measurements defined in IEC 61300‑3‑4 and related parts of the 61300 series).

Typical use and users

Used by test laboratories, manufacturers of multimode fibre‑optic sources and components, quality assurance teams and standards bodies to characterise source launch behavior and to set reproducible launch conditions for multimode attenuation and insertion‑loss testing. National standards institutes and product certification bodies referencing EN/IEC methods may also adopt or refer to this test in product or qualification protocols.

Related standards

Part of the IEC 61300 series (Basic test and measurement procedures). Closely related documents include IEC 61300‑3‑4 (attenuation/insertion‑loss measurement methods), IEC 61300‑1 (general guidance and definitions for the 61300 series) and other Part 3‑xx test methods that define launch, detector and source requirements. The published EN version is EN 61300‑3‑31:2003 (CENELEC adoption).

Keywords

Coupled power ratio; CPR; multimode source; launch conditions; 850 nm; 1300 nm; fibre optic sources; IEC 61300; attenuation; insertion loss; test procedure; CENELEC/EN adoption.

FAQ

Q: What is this standard?

A: IEC 61300‑3‑31:2003 is an IEC test method that defines how to measure the coupled power ratio (CPR) of multimode fibre‑optic sources to characterise launch behaviour and standardize launch conditions for other attenuation tests.

Q: What does it cover?

A: It covers the definition of CPR, the measurement wavelengths (typically 850 nm and 1 300 nm), the required test apparatus and launch/termination arrangements, the measurement procedure and reporting details necessary to obtain reproducible CPR values.

Q: Who typically uses it?

A: Test houses, fibre‑optic source and component manufacturers, QA and R&D teams, and standards/ conformity assessment bodies that need a repeatable way to characterise multimode source launch conditions.

Q: Is it current or superseded?

A: IEC 61300‑3‑31:2003 was withdrawn (IEC withdrawal recorded in December 2008). Users should consult the current parts of the IEC 61300 series (for example the latest IEC 61300‑3‑4 and IEC 61300‑1 editions) and national/adopted EN versions for up‑to‑date measurement guidance and any redistributed CPR requirements.

Q: Is it part of a series?

A: Yes — it is one part (3‑31) of the IEC 61300 series, “Fibre optic interconnecting devices and passive components — Basic test and measurement procedures,” which contains many Part 3‑xx documents covering examinations and measurements for fibres, connectors and components.

Q: What are the key keywords?

A: Coupled power ratio (CPR), multimode source, launch conditions, 850 nm, 1300 nm, IEC 61300, attenuation, insertion loss, measurement procedure.