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The optoelectronic fiber delay line microwave oscillator offers attractiveand large potential for numerous applications in high speed fiber opticscommunication, space, and radar systems. Its relevant features are very lowphase noise and wide-range tunability, while operating at frequencies of tensof GHz. We consider the contribution of the DFB laser to the oscillator phasenoise. Low frequency spectra of wavelength fluctuation and RIN are measured andanalyzed. As a conclusion, the oscillator phase noise can be improved by properchoice of optic and optoelectronic components.

DFB laser contribution to phase noise in an optoelectronic microwave oscillator