Fig. 7.16 The structural diagram of ОEO DM (а) with the direct modulation of the laser diode with
suppression by the optical filter OF1 of the one from optical carriers ν 1 ¼ ν 0 À f 0 , ν 2 ¼ ν 0 ,
ν 3 ¼ ν 0 À f 0 . (b) The structure of ОEO DM with realization of suppression of the one from optical
frequencies by the optical filter OF-OA (б). ОУ is the laser optical amplifier, OF1, OF2 are optical
filters with different own frequencies, which are equal relatively to the laser generation frequency
ν 2 ¼ ν 0 and the frequency ν 3 ¼ ν 0 À f 0 , FOS is the fiber-optical system, PD is the photodetector, NA
is the RF nonlinear amplifier, F is the RF filter, OC is the optical coupler, OIso is the optical isolator,
OCir is the optical circulator. In (b) the spectra of optical emission in FOIS are presented and spectra
of RF generation in the output of PD and in the input of LD1. The optical filter OF-OA (b) is
implemented on the base of commercial laser diode. The structural diagram of QWLD (c) and
equivalent circuit of external parametric circuits (d). In the circuit (d) the laser diode with the
complex impedance Z g is shown
7.3 OEO DM Analysis on the Base of Abbreviated Differential Equations
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