Focusing on the hardcore issue of multi-wavelength regeneration how to reduce nonlinear crosstalk
for spectrally efficient advanced modulation signals , the Fellow proposes pioneering concepts including novel nonlinear devices (nonlinear multi-core fibres and phase-sensitive parametric oscillator units), new crosstalk suppression methods (spatial-division-multiplexing and bidirectional oscillation methods).
Nonlinear methods are related to high input power, which results in additional nonlinear crosstalk
and reduced energy efficiency of overall transmission system .
This was specially done to take into account linear and nonlinear crosstalk
effects in the optical signal transmission to which the central group's channels (from the first to the third system's channel) are exposed from the channels of adjacent groups (4th-6th and 7th-9th).