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Work item:
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G.697
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Subject/title:
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Optical monitoring for dense wavelength division multiplexing systems
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Status:
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Approved on 2026-08-29
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Approval process:
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AAP
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Type of work item:
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Recommendation
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Version:
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Rev.
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Equivalent number:
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-
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Timing:
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-
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Liaison:
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-
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Supporting members:
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-
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Summary:
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Recommendation ITU‑T G.697 defines optical monitoring (OM) that can help in dense wavelength division multiplexing (DWDM) systems to perform the following activities:
– configuration management for system and channel activation, addition of new channels, etc.;
– fault management to detect and to isolate faults;
– degradation management in order to keep the system running and to detect degradations before a fault occurs.
DWDM technology is improving at a rapid pace, continuously stretching the channel count, channel speeds and reach limits. Long‑haul multi-span DWDM systems are capable of taking optical signals thousands of kilometres without electrical terminations or regeneration.
This continuing trend is driving the increasing importance of OM, which is the subject of this Recommendation.
This edition of this Recommendation provides additional information on new OSNR calculation method.
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Comment:
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-
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Reference(s):
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Historic references:
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Contact(s):
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| ITU-T A.5 justification(s): |
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First registration in the WP:
2026-01-13 16:25:08
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Last update:
2026-07-20 13:39:58
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