Ntt Technical Review, Vol. 19, No. 4, Apr. 2021

Browse technical resources about fiber optic cables, 400G optical transceivers, data center interconnect, FTTH, WDM, OTN, and BESS for communication sites.

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Technical Review 2021
  • AI Server Ranking in China in 2021

    AI Server Ranking in China in 2021

    The roots of the development of in the started in the late 1970s following 's emphasizing as the country's primary productive force. The initial stages of China's AI development were slow and encountered significant challenges due to lack of resources and talent. At the beginning China was behind most i.


  • Huawei optical modules for 2021 and later

    Huawei optical modules for 2021 and later

    In the AI era, Huawei provides a full range of GE to 800GE optical modules, featuring three major capabilities: Spanning (ultra-long transmission), Stable (ultra-high reliability), and Secure (ultra-solid security). Optical modules are important devices in fiber optic communication systems. Together, they ensure resilient data center interconnectivity and empower. In 2021, InnoLight will be tied for first place with II-VI (acquired optical module leader Finisar) (ranked second in 2020), Huawei (HiSilicon) will be ranked third (ranked third in 2020), and Hisense Broadband will be ranked 5th (4th in 2020), Eoptolink 7th (9th in 2020), and Accelink 8th (8th in. In the AI era, data center network interconnection presents new challenges for optical modules, requiring significant improvements in transmission distance, O&M efficiency, and interconnection security. To address these demands, Huawei has launched the StarryLink optical module brand.

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  • Technical Requirements for Outdoor Aerial Optical Cables

    Technical Requirements for Outdoor Aerial Optical Cables

    163 describes criteria for the installation of optical fibre cables defined in Recommendation ITU-T L. When selecting an optical fiber cable design, a number of factors must be considered to ensure that the best-fit cable design is selected for a. Deploying fiber above ground on poles or towers removes the need for underground digging and is particularly useful when the ground is uneven, rocky or both. Whether you're linking buildings, running broadband in rural areas, or building 5G infrastructure, the right cable matters. It affects performance, maintenance, cost, and reliability. Recommendations for Fiber Optic Cable Installation Where reels are supplied with protective material fitted over the cable, the protection should remain in place until the cable will be installed. The cable should be bent as little as possible.


  • Technical Requirements for Coarse Wavelength Division Multiplexers

    Technical Requirements for Coarse Wavelength Division Multiplexers

    CWDM was standardized by the ITU-T G. 2 based on a grid or wavelength separation of 20 nm in the range of 1270-1610 nm. Corning coarse wavelength division multiplexing (CWDM) solutions utilize advanced thin-film-filter technology. CWDM solutions are available in industry-standard 20 nm spacing with options for a 1310 nm RF overlay bypass as well as single or bidirectional test ports. Dense WDM (DWDM) uses the C-Band (1530 nm-1565 nm) transmission window but with denser channel spacing. This capability enhances system design flexibility and efficiency, making CWDM a valuable technology in modern broadcast and production environments. This proven technology offers wide channel bandwidth, flexible channel configuration, low insertion loss, and high isolation.


  • Can power system relay protection technology be upgraded to a technical level

    Can power system relay protection technology be upgraded to a technical level

    Recognizing the dire need for advanced relay protection, this report presents a comprehensive analysis of the evolving landscape. It outlines technical challenges, potential innovative solutions, equipment development trends, emerging market opportunities and new business. The global energy transition is ushering in a new era of power electronic-dominated grids (PEDGs), to complement the increase in the widespread integration of renewable sources like wind and solar. As technology advances and grids become smarter, the tools used to test and maintain these systems, such as the relay test set, are evolving to meet new challenges. This article explores the. Protective relays and devices have been developed over 100 years ago to provide “lastline”of defense for the electrical systems. Long term cost reduction (TCO) for trainings and maintenance by reduce variety of relays A fast and selective arc fault mitigation for air-insulated LV & MV switchgear and Relion protection and control relays and sensor. able sources such as wind and solar.

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