Optical Communications Laboratory

To contribute to the development of a connected society, we are pushing ahead with continuous innovation in optical fiber technologies fundamental to broadband communication networks and their expansion into data centers and households. We are also working on the application of optical technologies to new fields.

Z-PLUS Fiber 150
Z-plus Fiber™150

Optical Fiber

Pure silica core optical fiber with world record low transmission loss

Since the early 1970s, we have developed a vapor-phase axial deposition (VAD) method, a Japanese original technology, to produce optical fibers efficiently. Based on this technology, we have been making innovations in advanced optical fibers and related technologies.


Ultra-low loss optical fiber with pure silica core
Our ultra-low loss optical fibers based on pure-silica core technology are best for long-haul high-capacity communications, such as submarine optical cables. By our continuous innovation in glass and coating technologies, we achieved a transmission loss of 0.1419 dB/km at 1560 nm wavelength in 2017, which is a present record for lowest loss.

Next Generation Optical Fibers/ Connection Technology

Innovative multi-core optical fibers and connection technology

We are conducting R&D in innovative multi-core optical fibers (MCF) and related connection technology that overcomes the limitations of conventional standard single-core fiber and paves the way for petabit optical transmission.

Next generation optical fibers

*1 https://global-sei.com/company/press/2016/03/prs023.html
*2 http://www.ntt.co.jp/news2017/1708/170808b.html
*3 https://www.sei.co.jp/company/press/2015/03/prs022.html
*4 http://www.kddi-research.jp/newsrelease/2017/092201.html

Connection technology

High-Capacity Interconnection Technologies

High-capacity interconnection technologies for data centers

We are developing high-capacity interconnections using our metal and optical cable technologies for rapidly expanding data centers, where high speed as well as low power consumption are required.
For more infromation, please visit our "Fiber Optic Interconnect" site.

We are also working on the development of new high speed cables for appliances.

High-capacity interconnection technologies