69.1-Tbit/s Optical Transmission Technology Using Digital Coherent Multilevel QAM Format
- Technological fields
- Telecommunications Network Technologies
- Keyword
- Post 100 G transmission
- Digital coherent
- Fusion of light and wireless
- Laboratory organization
- NTT Network Innovation Laboratories
Overview
NTT has successfully demonstrated ultra-high-capacity (69.1 Tbit/s) optical transmission to meet the expected rapid increase in data traffic. This capacity is the highest reported in the optical communication field. A 69.1-Tbit/s signal generated by wavelength division multiplexing (WDM) of 432 wavelengths each with a capacity of 171 Gbit/s was transmitted over a single fiber over 240 km. The 16 QAM* format used led to an increase in spectral efficiency and demodulation was achieved by a newly developed digital coherent signal processing technique. This technology is useful for future optical core networks. (Tbit/s: terabits per second, tera = 1012.)
Features
- Ultra-high-capacity optical signal transmission of 69.1 Tbit/s (world record)
- Sufficient capacity to handle future increases in data traffic
- Increased spectral efficiency by using 16 QAM format
- Demodulation algorithm using novel digital coherent signal processing
- Ultra-wide band and low-noise optical amplifier
Application scenarios
- Backbone optical core network of NTT Communications
- Metro optical network of NTT East Corporation and NTT West Corporation
- * QAM: Quadrature Amplitude Modulation
