Actively Mode-Locked Optical Oscillators

Abstract

The invention belongs to the technical field of microwave photonics, and specifically relates to an active mode-locked photoelectric oscillator, including: a laser, a feedback modulator module, an active modulator module, a microwave source, an optical fiber, an optical delay line, a photoelectric detector, and a filter The photoelectric oscillation loop formed by the combination of the module, the electric amplifier and the electric coupler; the active modulation of the optical signal by the active modulator module can lock the phase of the adjacent longitudinal mode, and the spectrum shape of the generated microwave signal is an equidistant comb shape. The center frequency of the filter module can adjust the center frequency of the output spectrum, and the microwave signal with high stability and low phase noise can be generated by using the characteristics of the photoelectric oscillator. The invention utilizes the principle of active mode locking to generate ultra-short microwave pulse sequences with low phase noise, balanced power, tunable frequency and comb-shaped frequency spectrum.

Description

Technical field [0001] The present invention belongs to the field of microwave photomics, and more particularly to a active locking modulo oscillator. Background technique [0002] Microwave photonography is a new cross-discipline combined with microwave technology and photon technology. It is used in microwave systems to use the high-bandwidth of optical systems to solve some of the bottlenecks in the microwave system, mainly including microwave signals. Light generation, processing, and conversion, allocation and transmission of microwave signals in the light link, and the like. It produces new technologies, such as light-load frequency (ROF) communication, cable television (CATV) subcarrier multiplexing and optical fiber transmission, phased-controlled beamforming network and microwave frequency domain measurement technology Wait. [0003] The photoelectric oscillator acts as a reliable microwave source in the field of microwave photon technology, using long fibers to use the ...

AI Technical Summary

Problems solved by technology

In the light-based method, the fast nonlinear response of the tunnel junction of the scanning tunneling microscope (STM) is used, and the ultrafast optical pulse output by the mode-locked laser is used to excite the tunnel junction of the STM, so that the tunnel junction exhibits the nonlinear multi-dimensionality of the optical pulse. Mode mixing effect, and then generate multi-frequency microwave signals, but this method has the problems of large single-sideband noise and inflexible adjustment of comb distance

The method of generating MFC based on the nonlinear dynamic state of the semiconductor laser uses external conditions such as optical injection, optical feedback, and photoelectric feedback to disturb the semiconductor laser, so that the laser is in a nonlinear state, and then generates an MFC signal. This scheme is easily affected by external conditions. Influenced by conditions, the generated microwave frequency comb cannot remain stable for a long time

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