Hello everyone!
This post will share with you the WDM/OTN network latency composition.
The following figure shows a typical WDM/OTN network. The network latency lies in physical links and device components.
The latency of physical links is mainly introduced by line fibers and dispersion compensation fibers (DCFs).
1. The latency introduced by line fibers refers to the time it takes for optical signals to transmit over the line fibers.
2. The latency introduced by DCFs refers to the time it takes for optical signals to transmit over the DCFs.
The latency of devices is mainly introduced by electrical- and optical-layer units.
1. The latency introduced by optical-layer units refers to the latency generated when they process optical signals.
2. The latency introduced by electrical-layer units refers to the latency generated when electrical signals converted from optical signals at the receiving end undergo a series of operations on the board, such as mapping and forward error correction (FEC) encoding and decoding.
Magnitudes of latencies introduced by different parts of WDM/OTN networks:
Assume that an optical network circuit is 2000 km long (5 μs/km) and passes through 4 electrical regeneration sites (100 μs/site) and 30 optical amplifier sites (100 ns/site), and that DCF is used for dispersion compensation (0.625 μs/km), the total length of the pigtail and fiber patch cord that the entire system passes through is 5 km.
Example link:
Quantitative latency of non-coherent WDM/OTN networks:
If the fully coherent communication technology is used, no DCF is required on the line. Compared with the system using DCF, the latency of this system can be reduced by about 10% under the same fiber routing conditions.
Quantitative latency of coherent WDM/OTN networks:
That's all. What else do you want to know about WDM OTN latency? Welcome everyone to leave a message and exchange in the comment area!
Thank you！
