Overview
IEC 61300-3-7:2009 specifies standardized methods to measure the wavelength dependence of attenuation A(λ) and return loss RL(λ) for single‑mode passive optical components (POC) used in fibre‑optic telecommunications. This second edition (2009) replaces the 2000 edition and updates procedures to align with IEC 61300-1, covering both unidirectional and bi‑directional measurement approaches. The standard is not applicable to DWDM devices (see IEC 61300-3-29 for DWDM measurement techniques).
Key topics and technical requirements
- Measurement objectives
- Measurement of A(λ) only, RL(λ) only, or A(λ) and RL(λ) simultaneously.
- Results expressed in decibels (dB) as wavelength‑dependent functions.
- Defined test methods (selection depending on required resolution and equipment):
- Method A – Broadband light source (BBS)
- Method B – Tuneable narrowband light source (TLS)
- Method C – Set of multiple fixed narrowband light sources (NLS)
- Method D – Tuneable OTDR (TN‑OTDR)
- A reference method is also provided for calibration/verification.
- Apparatus and detection
- Sources: broadband sources, tuneable lasers, discrete narrowband sources, tuneable OTDRs.
- Detectors: optical power meters (OPM), optical spectrum analysers (OSA), tuneable‑narrowband detection systems.
- Supporting items: depolarizers, branching devices, terminations, and reference branching devices.
- Test configurations and procedures
- Detailed setups for attenuation‑only, return‑loss‑only, and combined measurements.
- Guidance on unidirectional vs bi‑directional testing, equipment resolution bandwidth, and how to report wavelength‑dependent traces.
Applications and who uses this standard
IEC 61300-3-7 is intended for professionals involved in the design, manufacture, testing and qualification of single‑mode passive optical components:
- Component manufacturers performing production and qualification testing for connectors, splitters, filters and other POC.
- Test laboratories and QA teams validating insertion loss and reflectance across wavelength ranges.
- Network operators and system integrators verifying component behaviour across planned operating wavelengths (e.g., PON, CWDM applications).
- R&D teams characterizing spectral performance of new single‑mode passive designs.
Using this standard helps ensure repeatable, comparable measurement data for attenuation, return loss, and wavelength‑dependent performance, supporting quality control, procurement specifications and interoperability.
Related standards
- IEC 61300-3-29 – Measurement methods for DWDM components (amplitude spectral characterisation).
- IEC 62074-1 – Generic specification and definitions for WDM device types.
- IEC 61300-1 – General test and measurement procedures referenced by this part.