Tunable opto-electronic oscillator (OEO) based on injection phase-locking

An optoelectronic oscillator and injection phase locking technology, applied in the field of microwave photonics, can solve the problem of not being able to take into account the side mode suppression and ultra-low phase noise output frequency at the same time, and achieve the effect of long-term stability improvement

Inactive Publication Date: 2018-03-02
NANCHANG INST OF TECH
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Problems solved by technology

[0004] The embodiment of the present invention provides a tunable optoelectronic oscillator based on injection phase locking, which can solve the problems existing in the prior art that side mode suppression, ultra-low phase noise and output frequency can be tuned at the same time.

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  • Tunable opto-electronic oscillator (OEO) based on injection phase-locking

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Embodiment Construction

[0010] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0011] refer to figure 1 , the embodiment of the present invention provides a tunable optoelectronic oscillator based on injection phase locking, the laser light emitted by the laser enters the electro-optic modulator for modulation, the modulated laser light is transmitted to the photodetector through the optical fiber, and the output terminal of the photodetector It is connected to the input end of the low noise amplifier, the output end of the low noise amp...

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Abstract

The invention discloses a tunable opto-electronic oscillator (OEO) based on injection phase-locking and relates to the technical field of microwave photonics. The structure of a filter bank is rapidlyswitched by a microwave switch, a frequency tunable OEO with ultra-low phase noise is realized by adopting injection phase-locking technology, a tunable microwave source adopts a highly stable crystal frequency doubling source, the output of one path is used for injection into a single-loop OEO, and a phase shifter in the OEO loop is adjusted so that a certain mode is aligned with an injection frequency point, so that main mode and side mode oscillations are suppressed. The other path is to perform phase discrimination with an output electrical signal of the OEO, a phase difference signal output by the phase discrimination is converted into a voltage signal, that is, the phase drift, and the feedback control is performed on the OEO loop through the control of a pressure-controlled phase shifter. Under the condition of ensuring ultra-low phase noise, the long-term stability of an output microwave signal of the OEO is also greatly improved.

Description

technical field [0001] The invention relates to the technical field of microwave photonics, in particular to a tunable photoelectric oscillator based on injection phase locking. Background technique [0002] Opto-Electronic Oscillator (OEO) is a new type of oscillator combining traditional microwave technology and photonic technology, which can generate microwave signals with ultra-low phase noise. At present, in the structure of OEO, thousands of meters of long optical fiber are generally used as energy storage elements to obtain high-Q resonant cavities. Long optical fibers are susceptible to changes in the external environment, which will affect the OEO output frequency drift; it will also lead to a very narrow OEO free spectrum range (below 1MHz). It is impossible to use the existing optical and electrical filters to filter out the multimode in the resonant cavity and realize the problem of OEO outputting tunable microwave signals. [0003] The electric microwave filte...

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Application Information

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IPC IPC(8): H01S1/02
CPCH01S1/02
Inventor 周正华杨小品
Owner NANCHANG INST OF TECH
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