Overview
IEC 61300-2-43:2022 is the third edition of an IEC test method for screen testing return loss of single‑mode PC optical fibre connectors. The standard defines a screening procedure for cylindrical‑ferrule physical‑contact (PC) connector plugs on patch cords and pigtails to ensure a designed minimum return loss when connectors are randomly mated in the field. This 2022 edition is a technical revision and adds Clause 3 with terms, definitions and abbreviated terms.
Key topics and technical requirements
- Purpose: screen connector plugs to guarantee minimum return loss performance when randomly mated (patch cords that pass will meet the designed minimum return loss in >99% of cases, Annex A).
- Scope: single‑mode, PC optical fibre connectors with cylindrical ferrules (domed, non‑angled end faces).
- Test concept: use a pair of reflection standard cords (RSCs) with a reflection standard plug (RSP) to screen DUTs so that the mated RSCs present return loss several dB better than the design threshold.
- Measurement methods: example procedure uses an optical continuous wave reflectometer (OCWR); the method can be adapted to other return‑loss measurement techniques in accordance with IEC 61300‑3‑6.
- Required apparatus (Clause 5): Source (S), Detector (D), Temporary Joint (TJ), Termination (T), Branching Device (BD), RSC/RSP.
- Critical performance limits and guidance:
- TJ return loss at least 10 dB better than the maximum return loss to be measured; fusion splice recommended for >50 dB measurements.
- Termination return loss at least 20 dB better than the maximum to be measured; suggested terminations include angled ends (minimum 12°), index‑matching material, or attenuation (e.g., mandrel wrap).
- BD should have stable split ratio, low PDL (recommended <0.1 dB), and adequate directivity.
Practical applications and users
Who uses IEC 61300-2-43:
- Fibre‑optic component and patch‑cord manufacturers for incoming/outgoing quality control and production screening.
- Independent test laboratories certifying connector return loss.
- Network operators and system integrators specifying acceptance tests for patch cords and pigtails in telecom/datacom deployments.
- R&D and quality engineers developing connector polishing and assembly processes.
Why it matters:
- Provides a reproducible screening method to reduce field return‑loss failures.
- Helps ensure interoperability and predictable optical performance when connectors are randomly mated.
Related standards
- IEC 61300 series - Basic test and measurement procedures for fibre‑optic interconnecting devices.
- IEC 61300‑3‑6 - Test methods for measuring return loss (normative reference).
- IEC 61755‑2‑1 - Background on how PC polishing affects end‑face reflection and return loss.
Keywords: IEC 61300‑2‑43, return loss screening, single‑mode PC optical fibre connectors, reflection standard cord (RSC), reflection standard plug (RSP), patch cord testing, pigtail testing, OCWR, IEC fibre optic tests.