NTT's new 12-core single-mode fiber achieves the highest core density

Recently, a new 12-core single-mode optical fiber passed acceptance inspection. This new optical fiber design can better meet the future big data needs. The result came from a research team at Japan's NTT Access Network Services Systems Laboratory, who successfully designed a multicore optical fiber (MCF) with 12-core channels. These cores are randomly coupled in the channel to transmit data over a standard diameter of 125 μm. The NTT team will showcase their achievements at OFC.

Taiji Sakamoto, research and development engineer at NTT, said: "With 12-core channels and a standard fiber diameter of 125 μm covering optical fibers, a new achievement in optical network transmission technology, we invested heavily in new technologies that can be applied to transmission systems and data centers. We need to evaluate Network to predict future bandwidth needs. "Sakamoto said there are many challenges that MCF faces in its development. First, the fiber needs to be used in a particular environment, so standard diameters are a top priority for system integrators and manufacturers.

To maintain their size, the research team tried to reduce the core pitch to save space and maximize the number of cores. NTT researchers aligned their cores in 125 μm diameter fibers through coupling. Up to 12 cores can now be aligned by the team. They are randomly coupled in the MCF by special warping methods. The researchers also used three geometries to align the cores: 19-core hexagonal array, 10-core ring array, and 12-core grid. By comparison, they considered the 12-cell grid layout to be randomly coupled in space density The most promising.

However, other problems need to be solved. For example, spatial mode dispersion is a thorny problem of MCF when signals propagate in the time domain. This makes real-time DSP difficult to implement, and DSP is an indispensable part of SDM. Because simply adding a fiber channel to a single-mode fiber amplifies these shortcomings, the Sakamoto team believes that MCF's use of a random-coupled core arrangement is the preferred way to reduce spatial mode dispersion.

Sakamoto added: "The complexity of signal processing caused by excessive SMD is a serious problem. We will do a research report on OFC and introduce our method of reducing SMD in MCF with more than 10 cores."

According to Sakamoto, the team's next step is to study the scalability of MCF's random coupling. If the research is successful, he expects the new technology will bring huge help to the development of the market in the next ten years. NTT will continue to explore the maximum number of MCF cores, maintain spatial mode dispersion and reduce signal processing complexity. Finally, he said: "We saw the promise of a stochastic MCF, so the next step was to explore ways in which we could achieve more cores, while at the same time guaranteeing random coupling to create higher performance fibers."

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