Free manipulation of ultra-high-speed signals using bandwidth-doubler device technologyUltra-high-speed modulation through cooperation of ultra-high-speed analog electronic devices and digital signal processing
High-Speed Analog Circuit Research Group
Background / Issues
Advanced modulation technology is applied to ultra-large-capacity optical transmission. To deal with the complexity of the modulation/demodulation processing, current optical transmission systems require LSI that implement the most advanced CMOS technology. On the other hand, achieving large capacity also requires high-speed modulation, and although CMOS technology that is capable of implementing circuits for producing complex signals is being applied, a breakthrough is required for driving an optical element at signal speeds exceeding 1 Tb/s.
Overview
The NTT Device Technology Laboratories are working on creating new technologies that fuse device technology for implementing digital signal processing, analog signal processing, and optical signal processing to further advance ultra-high-capacity transmission systems. The new technology combines parallelized digital signals with ultra-high-speed analog signal processing techniques to achieve twice the bandwidth conventionally possible.
Features
- Ultra-high-speed modulation is achieved by cooperative operation of digital signal processing and analog signal processing.
- With CMOS, it is difficult to achieve signal synthesis at modulation speeds above 60 GHz, but we achieved such speeds using compound semiconductor technology.
- Transmission experiments using the world's fastest 250 Gbit/s intensity modulation signal were successful.
- Transmission at speeds above 1 Tbit/s can be achieved by application to digital coherent technology.
Application scenarios
- Transmission at speeds above 1 Tbit/s can be achieved by application to digital coherent technology.
- Eliminate the bottleneck of long-haul optical transmission from datacenters by achieving ultra-high speed through optoelectronic fusion, reducing power consumption and the time required for signal processing
