Conflict of interest:Any actual or potential conflicts of interest do not exist for all 25
authors.The manuscript has not been published previously nor concurrently submitted for publication elsewhere.
400-Gbit/s multi-carrier optical transmissionThere are several ways to enhance capacity. One is to increase the number of wavelengths for multiplexing, and the other is to increase the signal speed of the optical channel per wavelength. In addition, there are mainly three ways to increase the signal speed of an optical channel [1]:1. Increase the rate of modulation
NTT Network Innovation Center is developing technologies and systems for the practical implementation of an optical transmission network, the key element for implementing the All-Photonics Network (APN), which in turn will support IOWN (the Innovative Optical and Wireless Network). With our nextgeneration optical transmission network, which is an advance release of the APN, we are working to increase speed and capacity to handle growing communication traffic as well as provide open optical interfaces for connecting various systems and devices without photoelectric conversion to enhance the added value provided by optical networks and develop operations and maintenance technologies for these networks.
NTT Network Innovation Center has developed a compact/power-saving optical open line system that can provide optical transmission of 100 Gbit/s per wavelength in an economical, space-saving, and power-saving manner. The goal with this system is to achieve large-capacity transmission up to edge buildings in the metro network to deal with the rapid increase in traffic accompanying the introduction of the 5th-generation mobile back haul. This article presents an overview of this system and its features.
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