Two ways of creating an optical comb in an optoelectronic oscillator are proposed and investigated. The first is based on using a multimode regime of operation in an optoelectronic oscillator; the second, on a modulation expansion of the laser line using high indices of modulation. Characteristics of the two schemes are investigated by means of numerical modeling.

We proposed and studied a new method which allows producing an optical frequency comb in an optoelectronic oscillator. In this method, comb parameters can be adjusted by controlling CW laser and microwave filter frequencies and amplitudes of modulating signals supplied to the arms of Mach-Zehnder modulator having two separate microwave inputs. Characteristics of the system were studied with numerical modeling for delay line and mictoresonator in the optoelectronic oscillator loop.

A method for generating an optical frequency comb in an optoelectronic oscillator is proposed and investigated. It is based on the modulation expansion of a laser line using large modulation indices. In the proposed scheme, a double-microwave-input amplitude modulator is used in a single-loop optoelectronic oscillator instead of a usual amplitude modulator, and an optical output is arranged after it. The circuit characteristics and parameters of the formed optical frequency comb and microwave oscillation are investigated using numerical simulation, which allows us to study highly nonlinear and multimode regimes. The advantage of the scheme is an easy control of all parameters of the optical frequency comb by changing the frequency of the CW laser, the average frequency of the microwave bandpass filter, and the amplitudes of the modulating signals applied to the modulator arms.

Characteristics of a reference optical frequency spectrum formed in a circuit with a continuous laser and an amplitude modulator with a high modulation index are investigated via numerical modeling. The possibility of forming microwave oscillations of a desired frequency is demonstrated, and the generation of a broadband microwave oscillation at the modulation of two or more lines selected from the optical frequency spectrum is studied.

Comparative study of different architectures for microwave photonics frequency converters of microwave signals is presented. Characteristics of the receivers with different architectures are obtained with the help of numerical simulation. Experimental parameters for the prototypes of receivers show good agreement with the results of numerical simulation. It is shown that the signal-to-noise ratio can reach 60-70 for a carrier frequency of tens of gigahertz and a receiving bandwidth of several hundreds of megahertz

Main characteristics of a model of the microwave photonic receiving channel with optical heterodyning have been numerically simulated and experimentally investigated. The transducer is based on a twoarm (signal and reference) balanced circuit with a continuous wave laser, amplitude modulators, narrow-band optical filters, and a photodetector. The possibility of implementation of the receiving channel with a signal-to-noise ratio of up to 60–70 dB, a carrier frequency of up to 40 GHz and more, and a detection bandwidth of up to 1 GHz is demonstrated. It is shown that semiconductor lasers without outer stabilizing cavities can be used in an optical pumping source by means of compensation of the laser frequency noise. It has been found, that if the modulator working point corresponds to the optical carrier frequency suppression mode, the noise characteristics of the detector can be maintained without application of narrow-band optical filters.