High-speed method and device thereof for modulating multi-system light with minimum-frequency by shift keying
A technology of frequency shift keying and modulation method, applied in the direction of frequency modulation carrier system, etc., can solve the problems of output signal spectrum broadening, difficult high-speed modulation, response speed limitation, etc., and achieve the effect of constant envelope and continuous phase.
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[0016] Optical 4MSK modulation principle such as figure 1 As shown, it is divided into two levels of modulation, the first level of modulation produces a frequency difference of 1 / T s FSK signal, the frequency difference generated by the second modulation is 1 / 2T s The QMSK signal. The FSK signal obtained by the modulation of the first stage is
[0017] E FSK ( t ) = E in 2 e j ( 2 π f 0 t + c k ( t ) πt / T ...
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