Optical oscillator and control method based on nonlinear modulation

Abstract

The embodiment of the application provides a photoelectric oscillator based on nonlinear modulation. The photoelectric oscillator includes a modulation unit that modulates a received laser beam basedon a feedback signal in a nonlinear operating state to obtain a modulated optical signal. A photoelectric conversion unit that divides the modulated optical signal into two signals, photoelectric converts one signal, outputs the photoelectric signal, and transmits the other signal to a nonlinear modulation unit; A control unit generates a non-linear modulation voltage for adjusting an operating state of the modulation unit to a non-linear operating state based on the modulated optical signal; An output unit processes the photoelectric signal and outputs a feedback signal and an output signal of the photoelectric oscillator. This scheme can optimize the phase noise in the near carrier frequency range of 10Hz-1kHz, and the near carrier frequency phase noise can be optimized more than 15dB. The structure of the scheme is simple, the phase noise characteristic of the photoelectric oscillator is kept, but also the phase noise does not deteriorate with the increase of the frequency.

Description

technical field [0001] The present application relates to the field of oscillator devices, in particular to a photoelectric oscillator based on nonlinear modulation and a control method. Background technique [0002] Since the optical cavity is far superior to the quality factor of the traditional microwave cavity, the phase noise of the optoelectronic oscillator is very superior, and its most significant advantage is that the phase noise of the output signal does not deteriorate with the increase of frequency. Although the phase noise of the optoelectronic oscillator is very superior, its biggest disadvantage is that the phase noise near the carrier frequency is poor, especially the phase noise index within the frequency deviation of 10Hz ~ 1kHz is poor. At present, there are mainly three structures of optoelectronic oscillators at home and abroad, namely single-ring structure, double-ring structure and multi-ring structure, including lasers, electro-optic modulators, optic...

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Problems solved by technology

[0003] The purpose of these different structures is to improve the side-mode suppression of the optoelectronic oscillator, but it cannot optimize the phase noise near the carrier frequency. Usually, in order to improve the phase noise near the carrier frequency of the optoelectronic oscillator, a high-stable crystal oscillator or atomic frequency is locked. It is carried out in a standard way, but the disadvantages of using this traditional microwave phase-locking mode are very obvious: 1. Using the traditional microwave phase-locking mode, the circuit structure is complicated, and the simple structure of the photoelectric oscillator is lost; 2. Using the traditional microwave phase-locking mode The photoelectric oscillator composed of the microwave phase-locked mode, the near-carrier frequency phase noise deteriorates proportionally with the increase of frequency, completely losing the original phase noise of the photoelectric oscillator does not deteriorate with the increase of frequency.

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