Monitoring of optical WDM signals

Monitoring of optical WDM signals

The invention relates to monitoring of optical signals 60 at a node 12, 14, 16 in a WDM telecommunications system 10 using a photodiode 54, 56, 58. The photodiode 54, 56, 58 has a short response time to permit measurement of the optical power thereof. Such a photodiode 54, 56, 58 can be used to moni...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: ROBERT RICHARD PACKHAM, ANDREW STRAW, STEVEN IAN PEGG, MARC FRANCIS CHARLES STEPHENS
Format: Patent
Sprache:eng
Schlagworte:
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
MULTIPLEX COMMUNICATION
TRANSMISSION
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Beschreibung
Zusammenfassung:The invention relates to monitoring of optical signals 60 at a node 12, 14, 16 in a WDM telecommunications system 10 using a photodiode 54, 56, 58. The photodiode 54, 56, 58 has a short response time to permit measurement of the optical power thereof. Such a photodiode 54, 56, 58 can be used to monitor many nodes within the system 10 and facilitates monitoring of optical signals in nodes which are far apart. The photodiode 54, 56, 58 also permits the Optical Signal to Noise Ratio (OSNR) of the optical signal 60 to be calculated by obtaining values for a maximum optical power P1 and a minimum optical power P0 for a particular optical signal 60.