Multi-band reconfigurable signal generating method based on multi-frequency optical local oscillator

A technology of local oscillator signal and reconstructed signal, applied in the field of microwave photonics, can solve the problems that restrict the multi-function, reconfigurability and productization of the radio frequency integrated system, and affect the rapid response ability of the system, so as to overcome the large time-bandwidth product. Effect

Active Publication Date: 2018-11-06
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This severely restricts the multi-functionalization, reconfigurability and productization of integrated radar, satellite and other radio frequency integrated systems, and affects the rapid response capability of the system

Method used

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  • Multi-band reconfigurable signal generating method based on multi-frequency optical local oscillator
  • Multi-band reconfigurable signal generating method based on multi-frequency optical local oscillator
  • Multi-band reconfigurable signal generating method based on multi-frequency optical local oscillator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Such as Figure 5 As shown, the device in this embodiment includes: laser source one, laser source two...laser source N+1, electro-optic modulator, optical filter, programmable optical processor based on microring, photodetector array, multi-channel Electrical delay, programmable electrical coupler.

[0063] First, laser source 1 produces a frequency f c The optical carrier is used as a single-frequency light source to modulate the reference signal. The frequencies of the multi-frequency light sources generated by laser sources 2 to N+1 are respectively: f 1 , f 2 … f N , which is regarded as a multi-frequency optical local oscillator. Then the light field generated by these two light sources can be expressed as:

[0064]

[0065] where a 1 , b n (n=1,2...N) is the magnitude of each frequency component.

[0066] When the optical carrier output by the laser source 1 is modulated by the electro-optical modulator, a time width is τ, bandwidth is B, and center f...

Embodiment 2

[0076] Such as Image 6 As shown, the device in this embodiment includes: a mode-locked laser, a laser, a dual-parallel Mach-Zehnder modulator, a programmable optical filter, an optical switch delay, a photodetector array, and a programmable electrical coupler.

[0077] First, the mode-locked laser generates an initial frequency f c1 , the frequency interval is f 1 The optical frequency comb is used as a multi-frequency optical local oscillator. The laser produces a frequency f c2 single-frequency optical local oscillator. The light field generated by these two light sources can be expressed as:

[0078]

[0079] where a n , b 1 (n=1,2...N) is the magnitude of each frequency component.

[0080] Then a reference signal is modulated to one side of the optical frequency comb by the carrier-suppressed single-sideband of the dual-parallel Mach-Zehnder modulator. Taking the reference signal as a chirp signal as an example, when inputting a time width of τ, bandwidth of B,...

Embodiment 3

[0092] Such as Figure 7 As shown, the device in this embodiment includes: a laser source, a beam splitter, a first electro-optic modulator, a frequency shifter, a second electro-optic modulator, a dual-parallel Mach-Zehnder modulator, a programmable optical filter, based on a single Optically tunable delayer, photodetection array and programmable electrical coupler for mode fiber.

[0093] First the laser source generates a frequency f c The optical carrier is divided into upper and lower parts by an optical beam splitter. The upper part modulates a frequency f by the first electro-optic modulator 1 A single-frequency signal to generate a frequency interval of f 1 The optical frequency comb one, as a multi-frequency optical carrier; the lower part first shifts the frequency of the optical carrier by a frequency shifter f s , may wish to set the frequency shift direction as the positive direction, that is, the optical carrier f c The frequency after frequency shift is f ...

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Abstract

The invention discloses a multi-band reconfigurable signal generating method based on a multi-frequency optical local oscillator. Two paths of optical local oscillator signals are generated, wherein at least one of the paths is a multi-frequency optical local oscillator signal; one optical local oscillator signal therein is used as an optical carrier to electro-optically modulate a low-frequency reference signal to the optical carrier, so as to generate a carrier-suppressed single sideband signal; the carrier-suppressed single sideband signal is coupled and frequency mixed with the other optical local oscillator signal, and each of the frequency components is divided as an independent channel; each channel signal is subjected to photoelectric conversion and delay processing respectively, thereby generating multiple radio frequency sub-band signals in different bands and at different times; and splicing and combining the radio frequency sub-band signals to obtain a reconfigurable signalwith randomly adjusted bandwidth, time width and center frequency. The invention also discloses a multi-band reconfigurable signal generating device based on the multi-frequency optical local oscillator. The signal bandwidth, the time width, and the center frequency of the present invention are flexible and variable; and the bandwidth and time width of the signal can be further extended.

Description

technical field [0001] The invention relates to a microwave signal generation method, in particular to a multi-band reconfigurable signal generation method, which belongs to the field of microwave photon technology. Background technique [0002] Multi-band reconfigurable signal generation, as an indispensable key module of multi-functional integrated radio frequency system, has been widely used in radio frequency integrated systems such as avionics, radar, and satellite. For example, in an electronic warfare system, the switching speed of reconfigurable signals will directly determine the response capabilities of fighters in detection, interference, and identification, thereby affecting the survival rate of fighters; radar systems require that the transmitted signals have both a large duration and a large Bandwidth, so that it can see far and clearly; In the satellite system, in order to realize functions such as communication, navigation, and weather forecast at the same ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/50H04B10/524H04B10/2525
CPCH04B10/2525H04B10/50H04B10/503H04B10/524
Inventor 朱丹陈文娟潘时龙谢晨旭唐震宙陈之文
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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