CN114447737A - Single-frequency microwave signal source based on active phase shift grating and signal generation method - Google Patents
Single-frequency microwave signal source based on active phase shift grating and signal generation method Download PDFInfo
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- 229910052691 Erbium Inorganic materials 0.000 claims 1
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- H01S1/00—Masers, i.e. devices using stimulated emission of electromagnetic radiation in the microwave range
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S1/00—Masers, i.e. devices using stimulated emission of electromagnetic radiation in the microwave range
- H01S1/02—Masers, i.e. devices using stimulated emission of electromagnetic radiation in the microwave range solid
Abstract
The invention belongs to the technical field of microwave photonics, and particularly relates to a single-frequency microwave signal source based on an active phase shift grating and a signal generating method, wherein the signal source comprises a pumping source, a wavelength division multiplexer, a dual-wavelength active phase shift grating, an optical isolator and a high-speed photoelectric detector; the pumping light output by the pumping source is connected to the input end A of the wavelength division multiplexer through a single-mode optical fiber; the output end of the dual-wavelength active phase shift grating is connected to a common end C of the wavelength division multiplexer through a single mode fiber; the output end B of the wavelength division multiplexer is connected to the input end of the optical isolator through a single mode fiber; compared with the prior art, the invention has the advantages and positive effects that: (1) the single-frequency microwave signal source based on the active phase-shift grating has the advantages of simple structure, compact volume and convenient integration; (2) the output signal is stable, the coherence is good, the line width is narrow, and the phase noise is low; (3) the laser generated by the dual-wavelength active phase shift grating has extremely short dual-wavelength interval, and can realize single-frequency decimetric wave microwave signal output.
Description
Technical Field
The invention belongs to the technical field of microwave photonics, and particularly relates to a single-frequency microwave signal source based on an active phase shift grating and a signal generation method.
Background
The high-performance microwave signal source has wide application in the fields of electronic countermeasure, wireless communication, satellite communication, atomic physics and the like. The traditional electronic signal generator represented by a frequency synthesizer and an analog-to-digital converter has narrow working bandwidth at high frequency, high transmission loss and poor noise characteristic, and limits the upper limit of the performance improvement of a microwave signal source from the source.
In recent years, emerging microwave photonics utilizes a photon technology to realize generation and processing of microwave signals, has the advantages of high precision, low noise, radio frequency optical fiber carrier, electromagnetic interference resistance and the like, can directly realize high-stability local oscillation and random waveform generation, avoids signal quality reduction caused by frequency doubling and up-conversion operation, and can well make up for the defects of a traditional electronic microwave signal source.
At present, a single-frequency microwave signal is generated by utilizing a photonics method, mainly by performing beat frequency on two or more laser signals with a certain phase relationship, the two beat frequency optical signals need to meet the conditions of constant phase difference, stable frequency and consistent polarization state, and after the two beat frequency optical signals pass through a photoelectric detector, a heterodyne signal is generated, wherein the frequency of the heterodyne signal is equal to the frequency difference of the wavelengths of the two optical signals.
Specific implementation methods include using a photon filter (CN 112865876A), a photoelectric oscillator (CN 102931568A), a multi-wavelength laser (CN 101572375 a), and the like. In order to achieve stable microwave signal output, both photonic filters and optoelectronic oscillator schemes typically use complex optical paths including polarization controllers and mach-zehnder interferometer architectures, and their filters and oscillator systems are expensive, low in overall reliability and low in ease of integration. On the other hand, a signal source needs to directly output single longitudinal mode multi-wavelength laser, and a common architecture includes a ring cavity laser using a rare earth doped fiber as a saturable absorber and a distributed feedback laser using a chirped bragg grating and a sampling grating to build a resonant cavity, but the fusion loss is large, the mode hopping is easy, and the phase noise is high. The last method is to use the short cavity active phase shift grating to match with the semiconductor laser diode pump to generate single longitudinal mode multi-wavelength laser, and the main difficulty of the method is to realize multi-wavelength output, the grating intensity and the phase shift position need to be accurately controlled, and the preparation and processing difficulty of the active phase shift grating is large.
Disclosure of Invention
Aiming at the problems, the invention provides a single-frequency microwave signal source based on an active phase shift grating and a signal generating method.
In order to achieve the purpose, the invention adopts the technical scheme that: a single-frequency microwave signal source based on an active phase shift grating comprises a pumping source, a wavelength division multiplexer, a dual-wavelength active phase shift grating, an optical isolator and a high-speed photoelectric detector;
the wavelength division multiplexer is provided with an input end A, an output end B and a common end C; the pumping light output by the pumping source is connected to the input end A of the wavelength division multiplexer through a single-mode optical fiber; the output end of the dual-wavelength active phase shift grating is connected to a common end C of the wavelength division multiplexer through a single mode fiber; the output end B of the wavelength division multiplexer is connected to the input end of the optical isolator through a single mode fiber;
the output end of the optical isolator is connected to the input end of the high-speed photoelectric detector through a single-mode optical fiber, and the output end of the high-speed photoelectric detector outputs a single-frequency microwave signal.
Preferably, the dual-wavelength active phase shift grating is a pi phase shift erbium-doped dual-wavelength active phase shift grating, the gate region of the dual-wavelength active phase shift grating is of an asymmetric structure, and the pi phase shift is close to the input end of the dual-wavelength active phase shift grating.
Preferably, the dual-wavelength active phase shift grating is prepared by 244nm ultraviolet laser on an erbium-doped photosensitive fiber by a scanning jitter phase mask method; in the ultraviolet laser scanning process, the jitter of the phase mask is accurately controlled, and pi phase shift of a quarter of the grating period is manufactured on the dual-wavelength active phase shift grating.
Preferably, the pump source is a 980nm semiconductor laser, and the pump source outputs 200mw of pump light.
Preferably, the wavelength division multiplexer is an 980/1550nm wavelength division multiplexer, and the optical isolator is a 1550nm optical isolator.
Preferably, the frequency range of the high-speed photoelectric detector is matched with the frequency of the received dual-wavelength narrow linewidth laser emitted by the dual-wavelength active phase-shift grating, and the response frequency of the high-speed photoelectric detector is not less than 1 GHz.
A single-frequency microwave signal generation method based on active phase shift grating comprises the following steps:
firstly, by utilizing the single-frequency microwave signal source based on the active phase shift grating, 200mw of pumping light output by a 980nm semiconductor laser of a pumping source is transmitted to a 980nm input end A of an 980/1550nm wavelength division multiplexer through a standard 980nm single-mode optical fiber;
outputting dual-wavelength narrow linewidth laser by the dual-wavelength active phase shift grating, and outputting the laser to a common end C of the wavelength division multiplexer through a 980nm single-mode fiber; the wavelength division multiplexer couples the pump light and the dual-wavelength narrow linewidth laser which are respectively input from the input end A and the common end C;
and transmitting the laser signal after the coupling in the third step to the input end of a 1550nm optical isolator by a 1550nm output end B of the wavelength division multiplexer, transmitting the laser signal to a high-speed photoelectric detector by the output end of the optical isolator through a 1550nm single-mode optical fiber, and generating a microwave electric signal with a frequency equal to the frequency difference value of the wavelengths of the two optical signals through beat frequency after the high-speed photoelectric detector receives a single-longitudinal-mode dual-wavelength laser signal generated by the dual-wavelength active phase-shift grating.
Compared with the prior art, the invention has the advantages and positive effects that:
(1) the single-frequency microwave signal source based on the active phase shift grating has the advantages of simple structure, compact volume, convenient integration and relatively low overall manufacturing cost, and avoids the use of a complex optical path comprising a polarization controller and a Mach-Zehnder interferometer framework and the use of an expensive filter and an expensive oscillator system;
(2) the single-frequency microwave signal source based on the active phase shift grating has stable output signals, good coherence, narrow line width and low phase noise;
(3) the single-longitudinal mode dual-wavelength laser generated by the dual-wavelength active phase shift grating in the single-frequency microwave signal source based on the active phase shift grating has extremely short dual-wavelength interval, and can realize the output of a single-frequency decimetric wave microwave signal;
(4) the dual-wavelength active phase shift grating is prepared by 244nm ultraviolet laser on an erbium-doped photosensitive fiber by a scanning jitter phase mask method; in the ultraviolet laser scanning process, the jitter of the phase mask is accurately controlled, and pi phase shift of a quarter of the grating period is manufactured on the dual-wavelength active phase shift grating; the preparation method of the dual-wavelength active phase shift grating reduces the difficulty of the preparation of the active phase shift grating.
Drawings
In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings used in the description of the embodiment will be briefly introduced below, fig. 1 is a schematic diagram of a single-frequency microwave signal source based on an active phase-shift grating,
FIG. 2 is a diagram of a single longitudinal mode dual wavelength laser spectrum generated by a dual wavelength active phase shift grating.
Description of reference numerals:
1-pumping source, 2-wavelength division multiplexer, 3-dual wavelength active phase shift grating, 4-optical isolator,
5-high speed photodetector.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be further described with reference to the accompanying drawings and examples.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and thus the present invention is not limited to the specific embodiments of the present disclosure.
Example 1
Referring to fig. 1 to 2, a single-frequency microwave signal source based on an active phase shift grating is specifically described, as shown in fig. 1, the single-frequency microwave signal source based on the active phase shift grating includes a pump source 1, a wavelength division multiplexer 2, a dual-wavelength active phase shift grating 3, an optical isolator 4, and a high-speed photodetector 5.
As shown in fig. 1, the wavelength division multiplexer 2 is provided with an input terminal a, an output terminal B, and a common terminal C; the pumping light output by the pumping source 1 is connected to the input end A of the wavelength division multiplexer 2 through a single mode fiber; the output end of the dual-wavelength active phase shift grating 3 is connected to the common end C of the wavelength division multiplexer 2 through a single mode fiber; the output end B of the wavelength division multiplexer 2 is connected to the input end of the optical isolator 4 through a single mode fiber.
As shown in fig. 1, the output end of the optical isolator 4 is connected to the input end of the high-speed photodetector 5 through a single-mode fiber, and the output end of the high-speed photodetector 5 outputs a single-frequency microwave signal.
The dual-wavelength active phase shift grating 3 is a pi phase shift erbium-doped dual-wavelength active phase shift grating, the gate region of the dual-wavelength active phase shift grating 3 is of an asymmetric structure, and the pi phase shift is close to the input end of the dual-wavelength active phase shift grating 3.
The dual-wavelength active phase shift grating 3 is prepared by 244nm ultraviolet laser on an erbium-doped photosensitive fiber by a scanning jitter phase mask method; in the ultraviolet laser scanning process, the jitter of the phase mask is accurately controlled, and pi phase shift of a quarter of the grating period is manufactured on the dual-wavelength active phase shift grating 3.
The difference between the two wavelengths of the single longitudinal mode dual-wavelength laser signal generated by the dual-wavelength active phase shift grating 3 is between 5pm and 15pm (the difference between the two wavelengths in fig. 1 is 12.05pm), and after frequency conversion, the signal is about 624-1871MHz, and belongs to the decimeter wave band in microwave. The single longitudinal mode and double wavelength laser signals generated by the double-wavelength active phase shift grating 3 have good coherence, narrow line width, low phase noise and stable mode, and can be directly subjected to beat frequency without any additional processing to generate single-frequency microwave signals. From the perspective of a system, the optical fiber grating has the advantages of simple structure, light volume, convenience in integration, easiness in modulation of optical carriers, adaptation to long-distance transmission, electromagnetic interference resistance and capability of serving as an ideal signal source in the field of radio frequency microwave photonics.
The pump source 1 is a 980nm semiconductor laser, and the pump source 1 outputs 200mw of pump light.
The wavelength division multiplexer 2 is an 980/1550nm wavelength division multiplexer, and the optical isolator 4 is a 1550nm optical isolator.
The frequency range of the high-speed photoelectric detector 5 is matched with the frequency of the received dual-wavelength narrow linewidth laser emitted by the dual-wavelength active phase-shift grating 3, and the response frequency of the high-speed photoelectric detector 5 is not less than 1 GHz.
A single-frequency microwave signal generating method based on active phase-shift grating, as shown in fig. 1, includes the following steps:
firstly, by using the single-frequency microwave signal source based on the active phase shift grating, 200mw pump light output by a 1980nm semiconductor laser pump source is transmitted to a 980nm input end A of an 980/1550nm wavelength division multiplexer 2 through a standard 980nm single-mode optical fiber; the pumping light is input from the input end A of the wavelength division multiplexer 2, passes through the common end C to the dual-wavelength active phase shift grating 3, and pumps the dual-wavelength active phase shift grating 3;
secondly, the pumped dual-wavelength active phase shift grating 3 outputs dual-wavelength narrow-linewidth laser, a single-longitudinal-mode dual-wavelength laser spectrogram is shown in figure 2, and the laser is output to a common end C of the wavelength division multiplexer 2 through a 980nm single-mode optical fiber; the wavelength division multiplexer 2 couples the pump light and the dual-wavelength narrow linewidth laser which are respectively input from the input end A and the common end C;
and transmitting the laser signal after coupling in the third step to the input end of a 1550nm optical isolator 4 through a 1550nm output end B of the wavelength division multiplexer 2, finally transmitting the laser signal to a high-speed photoelectric detector 5 through a 1550nm single-mode optical fiber from the output end of the optical isolator 4, and generating a microwave electric signal output with the frequency equal to the frequency difference value of the two optical signal wavelengths through beat frequency after the high-speed photoelectric detector 5 receives the single-longitudinal-mode dual-wavelength laser signal generated by the dual-wavelength active phase-shift grating 3.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and any person skilled in the art may apply the above-mentioned technical details to other fields by using the equivalent embodiments with equivalent changes or modifications, but any simple modification and equivalent changes made to the above embodiments according to the technical spirit of the present invention may still fall within the protection scope of the technical solution of the present invention.
Claims (7)
1. A single-frequency microwave signal source based on an active phase shift grating is characterized by comprising a pumping source (1), a wavelength division multiplexer (2), a dual-wavelength active phase shift grating (3), an optical isolator (4) and a high-speed photoelectric detector (5);
the wavelength division multiplexer (2) is provided with an input end A, an output end B and a common end C; the pumping light output by the pumping source (1) is connected to the input end A of the wavelength division multiplexer (2) through a single-mode optical fiber; the output end of the dual-wavelength active phase shift grating (3) is connected to the common end C of the wavelength division multiplexer (2) through a single mode fiber; the output end B of the wavelength division multiplexer (2) is connected to the input end of the optical isolator (4) through a single-mode optical fiber;
the output end of the optical isolator (4) is connected to the input end of the high-speed photoelectric detector (5) through a single-mode optical fiber, and the output end of the high-speed photoelectric detector (5) outputs a single-frequency microwave signal.
2. Single frequency microwave signal source based on an active phase shift grating according to claim 1, characterized in that the dual wavelength active phase shift grating (3) is a pi phase shift erbium doped dual wavelength active phase shift grating, the gate area of the dual wavelength active phase shift grating (3) is an asymmetric structure, and the pi phase shift is close to the input of the dual wavelength active phase shift grating (3).
3. The single-frequency microwave signal source based on the active phase shift grating of claim 2, characterized in that the dual-wavelength active phase shift grating (3) is prepared by a scanning dither phase mask method from 244nm ultraviolet laser on an erbium-doped photosensitive fiber; in the ultraviolet laser scanning process, the jitter of the phase mask is accurately controlled, and pi phase shift of a quarter of the grating period is manufactured on the dual-wavelength active phase shift grating (3).
4. The active phase-shift grating-based single-frequency microwave signal source of claim 3, wherein the pump source (1) is a 980nm semiconductor laser, and the pump source (1) outputs 200mw of pump light.
5. Active phase shift grating based single frequency microwave signal source according to claim 4, characterized in that the wavelength division multiplexer (2) is an 980/1550nm wavelength division multiplexer and the optical isolator (4) is a 1550nm optical isolator.
6. The single frequency microwave signal source based on active phase shift grating according to claim 5, characterized in that the frequency range of the high speed photodetector (5) should match the frequency of the received dual wavelength narrow linewidth laser emitted by the dual wavelength active phase shift grating (3), and the response frequency of the high speed photodetector (5) is not less than 1 GHz.
7. A single-frequency microwave signal generation method based on an active phase shift grating is characterized by comprising the following steps:
firstly, by using the single-frequency microwave signal source based on the active phase shift grating as claimed in claim 6, 200mw of pumping light output by a 980nm semiconductor laser of a pumping source (1) is transmitted to a 980nm input end A of an 980/1550nm wavelength division multiplexer (2) through a standard 980nm single-mode optical fiber;
outputting dual-wavelength narrow linewidth laser by the dual-wavelength active phase shift grating (3), and outputting the laser to a common end C of the wavelength division multiplexer (2) through a 980nm single-mode optical fiber; the wavelength division multiplexer (2) couples the pump light and the dual-wavelength narrow linewidth laser which are respectively input from the input end A and the common end C;
and step three, the coupled laser signal is transmitted to the input end of a 1550nm optical isolator (4) through a 1550nm output end B of the wavelength division multiplexer (2), finally, the laser signal is transmitted to a high-speed photoelectric detector (5) through a 1550nm single-mode optical fiber from the output end of the optical isolator (4), and after the high-speed photoelectric detector (5) receives a single-longitudinal-mode dual-wavelength laser signal generated by the dual-wavelength active phase-shift grating (3), a microwave electric signal with the frequency equal to the frequency difference value of the two optical signal wavelengths is generated through beat frequency and output.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101915949A (en) * | 2010-08-06 | 2010-12-15 | 上海交通大学 | Designing and manufacturing method of cosine luminous intensity distribution physical structure grating for optical measurement |
| CN103188019A (en) * | 2013-03-08 | 2013-07-03 | 华南理工大学 | Microwave signal source based on dual-wavelength single-frequency optical fiber laser |
| CN110160573A (en) * | 2019-07-08 | 2019-08-23 | 山东省科学院激光研究所 | Ai Hezi ultrafast modulation pulse scan laser and distributed optical fiber sensing system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101915949A (en) * | 2010-08-06 | 2010-12-15 | 上海交通大学 | Designing and manufacturing method of cosine luminous intensity distribution physical structure grating for optical measurement |
| CN103188019A (en) * | 2013-03-08 | 2013-07-03 | 华南理工大学 | Microwave signal source based on dual-wavelength single-frequency optical fiber laser |
| CN110160573A (en) * | 2019-07-08 | 2019-08-23 | 山东省科学院激光研究所 | Ai Hezi ultrafast modulation pulse scan laser and distributed optical fiber sensing system |
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