Tuning photoelectric oscillator and feedback control method thereof

Abstract

The invention discloses a tuning photoelectric oscillator which comprises a positive feedback oscillation system and a negative feedback oscillation system, the positive feedback oscillation system comprises a laser, an electro-optical modulator, a long optical fiber, a photoelectric detector, an adjustable filter, a low phase noise amplifier, a voltage-controlled phase shifter and a power divider which are connected in sequence, the first output end of the power divider is connected with a coupler, the coupler is connected with the radio frequency driving end of the electro-optical modulator, a second output end of the power divider is connected with the feedback control system; the feedback control system is connected with the laser and the electro-optical modulator respectively; the frequency modulation circuit comprises a coarse tuning circuit and a fine tuning circuit, the feedback control system is connected with the adjustable filter to form the coarse tuning circuit, the fine tuning circuit comprises a constant temperature crystal oscillator, a high phase discrimination frequency phase lock frequency synthesis circuit and an adjustable attenuator which are connected in sequence, and the adjustable attenuator is connected with the coupler; and the bandwidth locking circuit is formed by connecting a constant-temperature crystal oscillator with a feedback control system and connecting the feedback control system with a voltage-controlled phase shifter. According to the invention, rapid high-precision frequency modulation of the photoelectric oscillator can be realized.

Description

Technical field [0001] The present invention relates to a tuning photoelectric oscillator and a feedback control method thereof, belonging to the field of photoelectric oscillator in microwave photons. Background technique [0002] The microwave oscillator is the heart of the microwave radio system, playing a very important role in electronic systems such as communication systems, radar, test instruments, and electronic counterfeit systems. The phase noise, frequency stability, frequency tunability, etc. of the microwave oscillator are important indicators that determine the comprehensive performance of the system. Photoelectric oscillator (OEO) is a frequency source of a photovoltaic mixing structure that produces high frequency, high Q value, high spectrum purity RF signal, which compares other microwave oscillators with absolute advantages in terms of phase noise performance. However, there are currently many optical oscillators in China without the frequency modulation functi...

AI Technical Summary

Problems solved by technology

However, many optoelectronic oscillators in China do not have frequency modulation function at present, and they are all solving problems such as single-mode oscillation, noise suppression, and frequency stability.

Even with FM function, high-precision tuning cannot be achieved

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