NEC and NTT efficiently conduct first-of-its-kind long-distance transmission experiment over 7,000km utilizing 12-core optical fiber

NEC and NTT efficiently conduct first-of-its-kind long-distance transmission experiment over 7,000km utilizing 12-core optical fiber
NEC and NTT efficiently conduct first-of-its-kind long-distance transmission experiment over 7,000km utilizing 12-core optical fiber
~ Progress towards rising capability of transoceanic optical submarine cables ~

TOKYO, Mar 22, 2024 – (JCN Newswire) – NEC Corporation (TSE: 6701) and NTT Company (NTT) at present introduced that they’ve efficiently performed a first-of-its-kind transoceanic-class 7,280km transmission experiment utilizing a coupled 12-core multicore fiber(1), which consists of 12 optical sign transmission paths in a typical outer diameter optical fiber (0.125 mm). This achievement is anticipated to be a next-generation transmission infrastructure know-how that may contribute to the conclusion of large-capacity optical networks, together with future optical submarine cables.

Determine 1: Cross sections of a single-core fiber (left) and a coupled 12-core multicore fiber (proper)


With the unfold of 5G globally and elevated communications between knowledge facilities, worldwide Web visitors elevated at a median annual fee of 30% from 2018 to 2022 (*2), and this development is anticipated to proceed. With the intention to meet the robust communication demand, there’s a rising want to extend transmission capability per optical submarine cable system along with rising the variety of optical submarine cables.Current optical submarine cables use single-core fiber, which has a single optical transmission path referred to as a core inside a single fiber. In distinction, analysis and improvement is being performed all over the world to extend cable capability through the use of multicore fiber, which has a number of cores to extend transmission capability with out altering the usual outer diameter of the fiber. NEC is at the moment engaged in a challenge to put in a long-haul optical submarine cable system utilizing two-core multicore fiber with two optical transmission paths.

Analysis Outcomes

As extra cores are added to an optical fiber with a typical outer diameter, crosstalk happens when optical alerts leaking from a core intrude with optical alerts in adjoining cores, leading to interference, which deteriorates the standard of mutual communications. Particularly in long-distance transmission, along with the seriousness of crosstalk, it turns into tough to obtain transmitted alerts precisely as a result of non-uniformity of delay and loss between optical alerts.NEC and NTT have developed the next applied sciences to deal with these points.

Determine 2: Schematic diagram of the applied sciences developed

1. Growth of an algorithm by NEC for demodulation of acquired alerts utilizing A number of Enter A number of Output (MIMO) know-how

Though MIMO know-how is usually used to separate a number of interfering radio alerts, the dimensions of MIMO sign processing that has been put into sensible use in current optical communications is proscribed to two-polarization multiplexed alerts. As well as, multicore fiber with many cores requires extra in depth sign processing as a result of the optical alerts are additional multiplexed. As well as, the random prevalence of crosstalk in long-distance transmission is a matter that should be addressed. NEC has now developed an algorithm for long-distance transmission and utilized it to 24 x 24 MIMO (12 cores x 2 polarizations), enabling correct separation and demodulation of high-speed acquired alerts.

2. Growth of a coupled 12-core multicore fiber optical transmission line by NTT

In long-haul optical communications utilizing multicore fiber, when non-uniform delays and losses happen within the propagation between multiplexed optical alerts, the circuit sources required for MIMO sign processing throughout reception enhance, making implementation and realization tough. As well as, non-uniformity in propagation loss vastly limits the space that may be transmitted. On this research, NTT has developed design applied sciences for coupled multicore fiber and optical enter/output units (connecting fan-in/fan-out) that may cut back the consequences of non-uniformity amongst sign delay and loss, in addition to optical transmission line design analysis applied sciences for long-haul purposes.Combining these applied sciences, NEC and NTT performed long-distance transmission experiments over 7,280km, assuming a transoceanic-class optical submarine cable, and succeeded for the primary time on this planet in precisely demodulating 12-spatially multiplexed optical alerts offline.

Determine 3: Tendencies in long-haul optical transmission utilizing space-division multiplexed fibers of normal outer diameters and the positioning of those analysis outcomes

Future Developments

The 2 firms will additional advance the analysis and improvement of those applied sciences with the goal of commercializing them as a long-haul, high-capacity optical submarine cable system and terrestrial core community system that may contribute to the conclusion of a high-capacity optical transmission infrastructure within the IOWN® (*3) idea and Past 5G/6G period within the 2030s.NEC and NTT will current the outcomes as a extremely scored paper on the Technical Convention of OFC 2024, the world’s largest occasion on optical communications (March 24 to March 28, 2024, on the San Diego Conference Middle in California, USA).

(1) Coupled multicore fiber: An optical fiber through which alerts transmitted in every core are separated and demodulated by post-processing on the premise that optical alerts leaking from a number of optical transmission paths (cores) within the fiber intrude with and affect one another.
(2) Supply: TeleGeography (
(3) Modern Optical and Wi-fi Community (IOWN) is a complicated communications infrastructure incorporating cutting-edge photonics, computing and different applied sciences to comprehend a better world promoted by IOWN World Discussion board (

Press launch: NTT, Intel and Sony Set up New World Discussion board Devoted to Realizing the Communications of the Future

About NEC CompanyNEC Company has established itself as a pacesetter within the integration of IT and community applied sciences whereas selling the model assertion of “Orchestrating a brighter world.” NEC permits companies and communities to adapt to speedy modifications going down in each society and the market because it supplies for the social values of security, safety, equity and effectivity to advertise a extra sustainable world the place everybody has the prospect to achieve their full potential. For extra data, go to NEC at

Matter: Press launch abstract

Supply: NEC Corporation

Sectors: Telecoms, 5G, Wi-fi, Apps

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