In Frequency Shift Keying the transmitted signal shifts between two different frequencies to represent binary data, like two different notes from a piano. This would technically be 2-FSK modulation.

This tutorial explains the fundamentals of time-, frequency-, and modulation-domain analysis from the perspective of several examples.

NTT Corporation and Tokyo Denki University have succeeded in further stabilizing the graduated frequency of an optical frequency ruler generated by modulating the intensity and phase of laser ...

Polygonal optical vortices uniquely enable numerous applications due to the new degrees of freedom and their customizable ...

NTT stabilized the frequency of an electro-optic modulation-based optical frequency comb for high-speed and large-capacity optical comms applications.