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NEC breaks spectral efficiency record close to Shannon's limit
A few days ago, NEC announced that it has achieved a single optical fiber transmission capacity of 34.
9Tbit/s
over a distance of more than 6300 kilometers.
This achievement broke the record for spectral efficiency of transoceanic transmission, using the C-band spectrum to achieve 8.
3 bit/s/Hz, an increase of 16.
9%
over the previous record.
These results are very close to the Shannon limit
, which limits the fundamental efficiency of optical communications.
Maximizing spectral efficiency is one of the main goals in designing submarine cable networks to achieve the highest possible capacity of a single fiber group while reducing end-equipment costs, space reduction, and energy consumption
.
NEC's technology demonstration is within the theoretical maximum range
of 0.
5 dB.
"We are delighted that this achievement is so close to the Shannon limit
.
" Toru Kawauchi, General Manager of NEC Marine Network, said, "NEC's R&D team will continue to explore the limits
of greater subsea capacity, resilience and cost-effectiveness.
”
These results were recently presented
at the 2016 Fiber Optic Communications Exhibition in Anaheim, California, USA.
According to NEC research, the previous transoceanic transmission spectrum efficiency record was 7.
1bit/s/Hz
.
(Note: Shannon's theorem gives the upper limit of the channel information transmission rate (bits per second) and the relationship between the channel signal-to-noise ratio and bandwidth
.
) Shannon's theorem is used to find the maximum transmission rate of the channel, that is, the channel capacity, when the signal rate through the channel exceeds the channel capacity of Shannon's theorem, the bit error rate is significantly increased and the information quality is seriously reduced
.
）
，
NEC breaks spectral efficiency record close to Shannon's limit
NEC breaks spectral efficiency record close to Shannon's limitA few days ago, NEC announced that it has achieved a single optical fiber transmission capacity of 34.
9Tbit/s
over a distance of more than 6300 kilometers.
This achievement broke the record for spectral efficiency of transoceanic transmission, using the C-band spectrum to achieve 8.
3 bit/s/Hz, an increase of 16.
9%
over the previous record.
These results are very close to the Shannon limit
, which limits the fundamental efficiency of optical communications.
Maximizing spectral efficiency is one of the main goals in designing submarine cable networks to achieve the highest possible capacity of a single fiber group while reducing end-equipment costs, space reduction, and energy consumption
.
NEC's technology demonstration is within the theoretical maximum range
of 0.
5 dB.
"We are delighted that this achievement is so close to the Shannon limit
.
" Toru Kawauchi, General Manager of NEC Marine Network, said, "NEC's R&D team will continue to explore the limits
of greater subsea capacity, resilience and cost-effectiveness.
”
These results were recently presented
at the 2016 Fiber Optic Communications Exhibition in Anaheim, California, USA.
According to NEC research, the previous transoceanic transmission spectrum efficiency record was 7.
1bit/s/Hz
.
(Note: Shannon's theorem gives the upper limit of the channel information transmission rate (bits per second) and the relationship between the channel signal-to-noise ratio and bandwidth
.
) Shannon's theorem is used to find the maximum transmission rate of the channel, that is, the channel capacity, when the signal rate through the channel exceeds the channel capacity of Shannon's theorem, the bit error rate is significantly increased and the information quality is seriously reduced
.
）
，
