In a first of its kind experiment in China, a consortium of researchers from CICT (China Information and Communication Technology), FiberHome and Accelink have successfully developed a system capable to transmit at petabit rates.
The National Information Optoelectronics Innovation Center and the National Key Laboratory of Optical Fiber Communication Technology and Network China working as the subsidiary of CICT Group were involved in the experiment. FiberHome and Accelink also joined hands with the Innovation Center to develop an ultra-large-capacity wavelength and space division multiplexing optical transmission system that transmits 1.06 Petabits per seconds.
The acheived transmission capacity is 10 times the maximum capacity of the existing single-mode optical fiber transmission systems in use. To understand the importance of the experiment, you can refer to the below comparison
1 Terabit per second optical transmission can transmit 2,300 numbers of 4k movies (Blu-Ray 50G) in one second.
The experiment used the items manufactured in China to achieve the ultra-high-speed transmission rate. Over a period of time, China has developed a strong network of research laboratories for conducting trials and to train young aspirants in technology.
The experimental result achieved, by using domestic optical transmission system technology, optical device, and optical chip technology, and the most advanced achievements in fiber optic cable technology mark China’s new progress in the field of “ultra-large capacity, ultra-long-haul, ultra-high-rate” optical communication systems.
FiberHome in a statement issued in their website said that the optical system equipment generates 375 optical carriers in the C+L band. The transceiver used was a Silicon Optical Coherent transceiver, which made the transmission of 178.18 Gbps FTs-PDM-16QAM signals and reception in the 25 GHz channel.
The researchers used a single mode fiber with 19 cores in one cladding, that is a Multicore FIber (MCF). Multicore fibers can carry the signal through all the cores at the same time. Note that, a Multicore fiber is different from a Multimode fiber. Multicore fibers will have multiple numbers of core regions physically present inside the cladding.
The total transmission capacity of the experiment reached 1.06Pbit/s, and the spectral efficiency recorded was 113bit/s/Hz. An independent verification agency witnessed teh whole testing and confirmed that a 19-core single mode fiber can transmit 1.06Pbps
The core optical chip and optical fiber used in this experiment are independently developed and have completely independent intellectual property rights within China.
The silicon optical coherent transceiver chip is jointly developed by the National Information Optoelectronics Innovation Center, the National Key Laboratory of Optical Fiber Communication Technology and Network, Accelink and FiberHome.
The transceiver chip integrates nearly 60 active and passive optical components on a silicon chip of less than 30 square mm, including optical transmission, modulation, reception, etc., which can support C + L band (1530nm to 1625nm) simultaneous operation. This transceiver chip is the most advanced integrated commercial photonic integrated chip in China.
Researchers could solve the cross-channel crosstalk problem of single-mode 19-core fiber through a series of trials and fine-tuning of the optoelectronic devices. The isolation of adjacent cores is better than -40dB, which minimizes the interference and influence between “lane” and “lane”.
In comparison to the experimental results from China, it is worth to note that the Japanese companies Sumitomo Electric in collaboration with NICT and Yokohama National University had demonstrated 10 Petabits per seconds at a research laboratory of KDDI Japan. This experiment used a 6-mode 19-core fiber in the C+L bands. This type multicore fibers are called few mode multicore fibers (FM MCF).
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