Optical Multi-Band Networks use several optical bands for the signal transmission by wavelength division multiplex in standard singlemode fibers. Thus, it enables them to achieve an optical bandwidth up to 10 times higher than conventional systems, only using the optical C-band.
The use of several wavelength bands for the data transmission in standard singlemode fibers is a promising strategy for increasing the transmission capacity in fiber optical communication networks. By using all available bands from the O-band to the L-band, the optical bandwidth can be increased by a factor of 10, compared to conventional C-band systems. The challenges for the realization of such multiband networks lie both in the development of key components - such as coherent transceivers, configurable optical switches (ROADMs) and optical amplifiers - as well as in the modelling of the physical layer and its abstraction for network planning and control. In this context, Fraunhofer HHI is developing new algorithms for monitoring and correcting of the nonlinear impairments of the transmission line and transceiver components. Moreover, strategies for upgrading existing C-band networks to multi-band networks are being developed and tested. This includes the optimization of multi-band transmission systems, for example to maximize the capacity times distance product, as well as the experimental validation in the lab and in field trials.