IEC 60728-6:2011

Overview

IEC 60728-6:2011 - "Cable networks for television signals, sound signals and interactive services - Part 6: Optical equipment" - is the third edition of the IEC international standard that specifies measurement methods, performance requirements and data‑publication requirements for optical equipment used in cable networks. It replaces the 2003 edition and incorporates technical updates such as revised normative references, new measurement parameters and updated classification and data‑sheet requirements for optical transmitters, receivers and amplifiers.

Key topics and technical requirements

This standard focuses on practical, reproducible test and specification practices for optical components in TV/sound/interactive cable systems. Important technical topics include:

• Measurement methods: procedures for optical power, loss, isolation, directivity, coupling ratio, saturation output power, centroidal wavelength, spectral width, linewidth and chirping of laser transmitters, optical modulation index, slope and flatness.
• Distortion and interference metrics: methods for CSO/CTB of transmitters, composite cross‑modulation, receiver intermodulation and a newly added method for carrier‑to‑crosstalk ratio (CCR).
• Optical amplifier parameters: introduction of microscopic gain tilt measurement (replacing earlier CSO/CTB approaches) and Annex B calculation method for estimating second‑order distortion from microscopic gain tilt.
• Noise and dynamic performance: relative intensity noise (RIN), equivalent input noise current, noise figure of amplifiers, SBS threshold and other noise parameters.
• Classification and data publication: defined classes for optical transmitters and receivers, required published data (data sheets/product specification worksheets - Annex A for amplifiers), plus recommendations for safety, EMC and environmental handling.
• Changes vs. previous edition: updated normative references, substitution of some measurement methods by references to other standards, deletion of polarization dependent loss measurement, and addition of CCR and microscopic gain tilt metrics.

Practical applications

IEC 60728-6:2011 is directly applicable to:

• Design and engineering of cable-TV optical links (HFC and fiber-fed headend/distribution).
• Manufacturing and factory acceptance testing (optical transmitters, receivers, EDFAs/amplifiers).
• Test labs and certification bodies performing standardized measurements for product compliance.
• Network operators and system integrators specifying supplier data sheets and verifying installed equipment performance.
• Procurement teams using the standard’s data‑publication requirements to compare products consistently.

Who should use this standard

• Optical component and equipment manufacturers
• Test laboratories and QA engineers
• Cable network designers and operators
• Procurement/specification engineers and standards/compatibility teams

Related standards

IEC 60728‑6:2011 references other normative documents for certain measurement techniques; users should consult associated IEC/ITU‑T optical measurement standards and industry test standards for complementary procedures and traceability.

Keywords: IEC 60728-6:2011, optical equipment, cable networks, optical amplifiers, optical transmitters, optical receivers, CCR, microscopic gain tilt, measurements, CSO, CTB, RIN, data publication.