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CAPACITY LIMITS  - The capacity of an optical communication system is limited by a combination of noise (generated by optical amplifiers & transceiver modules), distortion caused by optical fibre nonlinearity and overall optical bandwidth. Advances in digital signal processing (DSP), modulation formats [1], high speed electronics, single-mode fibres and broadband optical amplification, have resulted in recent landmark transmission results, with demonstrations of capacities exceeding 70 Tbit/s over transatlantic distances [2] and an overall capacity record of 115.9 Tbit/s over 100 km [3]. They are summarised in the following figure.components which add loss and also create a small gap in the transmission bandwidth, which is limited to around 75 nm. While the SOA offers continuous amplification, it has relatively high noise figure, so system performance decreases rapidly with distance. The hybrid EDFA / Distributed Raman Amplifier, pumps the transmission fibre, creating Raman gain in what would otherwise be a lossy fibre and extending the bandwidth beyond that of an EDFA.
 

 

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  • Posted on : February 03rd, 2020
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