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Standards Development
This part of IEC 61290 specifies requirements for accurate and reliable measurements of four-wave mixing (FWM) crosstalk in optical amplifiers using the two wavelengths method. It applies to all commercially available optical amplifiers (OAs) using active fibres and waveguides containing rare-earth dopants.
Annex A specifies an alternative method for evaluating four-wave mixing (FWM) crosstalk with a large number of DWDM inputs to assess its impact on the DWDM transmission system.
Specific aims and reasons for the standardization activity
If approved, the proposed standard specifies methods for the accurate and reliable measurement of four- wave mixing (FWM) crosstalk in optical amplifiers. It establishes the definition of FWM crosstalk, measurement configurations, requirements for test equipment, measurement procedures, calculation methods, and reporting requirements.
FWM crosstalk measurement methods have previously been described in a technical report, but a measurement method has not been established as an International Standard. Consequently, optical amplifier manufacturers and users may apply their own evaluation methods. This standardization activity is intended to establish common measurement conditions and procedures for consistent evaluation of FWM crosstalk.
Main interests
The main interested parties are manufacturers and users of optical amplifiers and optical amplifier subsystems used in DWDM optical transmission systems, where FWM crosstalk is a relevant limiting factor.
Feasibility of the activity
The activity is technically feasible because a complete draft has already been prepared based on OITDA AM 02:2025 (Japan). The draft defines the measurement apparatus, equipment characteristics, test conditions, measurement procedures, calculation methods and reporting requirements. It includes a basic two-wavelength measurement method and an alternative method using a large number of DWDM inputs.
Timeliness of the standard
The standard is timely because increasing optical amplifier output power, wider transmission bandwidth and higher DWDM channel counts make the impact of FWM crosstalk more significant. A standardized measurement method is therefore needed to support consistent evaluation of optical amplifiers under operating conditions relevant to DWDM transmission systems.
Urgency of the activity
Timely initiation is desirable so that an International Standard becomes available while manufacturers and users are actively evaluating FWM crosstalk. Establishing the standard now will provide a common measurement method and avoid the continued use of divergent, non-comparable evaluation methods.
Benefits
The proposed standard will provide accurate and reliable methods for measuring FWM crosstalk in optical amplifiers. It will establish common measurement conditions, procedures, calculation methods and reporting requirements. The standard is expected to facilitate commercial transactions involving optical amplifiers and optical amplifier subsystems.
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