CN113922878B - Photon generating device capable of resisting dispersion power weakening and switching multi-format chirp waveforms - Google Patents
Photon generating device capable of resisting dispersion power weakening and switching multi-format chirp waveforms Download PDFInfo
- Publication number
- CN113922878B CN113922878B CN202111120571.5A CN202111120571A CN113922878B CN 113922878 B CN113922878 B CN 113922878B CN 202111120571 A CN202111120571 A CN 202111120571A CN 113922878 B CN113922878 B CN 113922878B
- Authority
- CN
- China
- Prior art keywords
- modulator
- chirp
- bias
- sub
- double
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000006185 dispersion Substances 0.000 title claims abstract description 18
- 230000003313 weakening effect Effects 0.000 title description 3
- 239000000835 fiber Substances 0.000 claims abstract description 10
- 230000010363 phase shift Effects 0.000 claims description 16
- 230000009977 dual effect Effects 0.000 claims description 6
- 239000013307 optical fiber Substances 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 description 14
- 238000010586 diagram Methods 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010291 electrical method Methods 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
- H04B10/25137—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion using pulse shaping at the transmitter, e.g. pre-chirping or dispersion supported transmission [DST]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/5165—Carrier suppressed; Single sideband; Double sideband or vestigial
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention relates to a photon generating device capable of resisting dispersion power attenuation and switching multi-format chirp waveforms, which comprises a laser, a double-drive double-parallel Mach-Zehnder modulator (comprising a first sub-modulator and a second sub-modulator), a first 90-degree bridge, a second 90-degree bridge, a single-mode fiber, a band-pass filter, a photoelectric detector and a power supply control unit, wherein the first sub-modulator is a first sub-modulator; the laser output by the laser is input into a main modulator, a radio frequency signal is divided into two paths of radio frequency input ports respectively loaded on a first sub-modulator through a first 90-degree bridge, a single chirp signal is divided into two paths of radio frequency input ports respectively loaded on a second sub-modulator through a second 90-degree bridge, and the main modulator is connected with a band-pass filter through a single-mode fiber and a photoelectric detector; the power supply control unit controls the DC bias points of the second double-parallel sub-modulator to work in a single-sideband modulation mode, and the generation of down-chirp, double-chirp and up-chirp waveforms is switched by adjusting the DC bias points of the first sub-modulator and the main modulator.
Description
Technical Field
The invention belongs to the technical field of microwave photonics, and particularly relates to a photon generating device capable of resisting dispersion power attenuation and switching multi-format chirp waveforms.
Background
Linearly chirped microwave waveforms are widely used in radars to improve detection range and range resolution. In the conventional art, a linearly chirped microwave waveform is electrically generated by a voltage controlled oscillator. Linear ramp control voltage or direct digital synthesizer. However, the center frequency and bandwidth of the resulting signal are limited by electronic bottlenecks. Compared with an electrical method, the method for generating the microwave chirp signal in the optical domain has the advantages of high instantaneous ultra-wideband, large spectrum tuning range, strong anti-interference capability and the like. To date, a number of linearly chirped microwave waveform schemes based on microwave photonics have emerged. Such as frequency-time mapping and optical heterodyning.
To further increase the time-bandwidth product of chirped radio frequency signals, a method of frequency bandwidth multiplication using an external modulator based on a swept-frequency opto-electronic oscillator has been proposed by those skilled in the art. This is important in modern radar systems. However, linearly chirped microwave waveforms have a wide range of doppler-coupled knife edge-blurred coupling. To overcome this drawback, a person skilled in the art proposes a double-chirped microwave waveform consisting of two linearly chirped complementary microwave waveforms. In some cases, transmitting a double chirped microwave waveform is a better solution. However, in some scenarios, such as a multi-function radar system, switchable multi-format chirp waveforms are required to respond to different demands, and existing methods are complex in structure and limited in transmission by periodic power attenuation of the fiber.
The invention improves the technical problems.
Disclosure of Invention
Based on the above-mentioned shortcomings in the prior art, the present invention provides a photon generating device with reduced anti-dispersion power and switchable multi-format chirp waveforms.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
a photon generating device capable of resisting dispersion power weakness and switching multi-format chirp waveforms comprises a laser, a dual-drive dual-parallel Mach-Zehnder modulator (comprising a first sub-modulator and a second sub-modulator), a first 90-degree bridge, a second 90-degree bridge, a single-mode optical fiber, a band-pass filter, a photoelectric detector and a power supply control unit; the laser output by the laser is input into a dual-drive dual-parallel Mach-Zehnder modulator, a radio frequency signal is divided into two paths with 90 degrees phase difference by a first 90-degree bridge and is respectively loaded into two radio frequency input ports of a first sub-modulator, a single chirp signal is divided into two paths with 90 degrees phase difference by a second 90-degree bridge and is respectively loaded into two radio frequency input ports of a second sub-modulator, the dual-drive dual-parallel Mach-Zehnder modulator is connected with a single-mode fiber, and the single-mode fiber is connected with a band-pass filter by a photoelectric detector; the power supply control unit controls the DC bias points of the sub-modulator II to work in a single sideband modulation mode, and the generation of down-chirp, double-chirp and up-chirp waveforms is switched by adjusting the DC bias points of the sub-modulator I and the main modulator, and the generated waveforms have the function of resisting dispersion power attenuation. The invention can realize the generation of the multi-format chirp waveform which can resist the weakening of the dispersion power and can be switched, and is applied to the fields of multifunctional radars and the like.
Preferably, the dual drive dual parallel Mach-Zehnder modulator has three DC bias inputs, wherein the input voltage under bias 2 ideal conditions is equal toV π In order to adjust the half-wave voltage of the modulator, namely the sub-modulator II works at the orthogonal bias point, the bias 1 and the bias 3 are adjusted according to the required up-chirp, double-chirp or up-chirp waveforms in an ideal state, and the input is controlled by a power supply control unit.
Preferably, if the down-chirp waveform is to be generated, the phase shifts caused by the bias 1 and the bias 3 are respectivelyAnd pi; if a double chirp waveform is to be generated, the phase shifts caused by bias 1 and bias 3 are +.>And->m 1 Is the modulation factor of the radio frequency signal, J n () Representing a first class of Bessel functions; if up-chirp waveform is to be generated, the phase shift caused by bias 1 and bias 3 is +.>
Preferably, the 90 ° bridge actually plays a role of branching and phase shifting, and can be replaced by other branching and phase shifting devices.
Preferably, the power supply control unit is an automatic bias point control circuit, and the power supply control unit can be composed of different adjustable direct current voltage sources.
Compared with the prior art, the invention has the beneficial effects that:
(1) The direct-current bias point of the modulator is adjusted to finish the switching among the down chirp, the double chirp and the up chirp, and the device has no polarization and simple structure.
(2) The signal power attenuation caused by dispersion is eliminated by single sideband modulation of the chirp signal.
Drawings
FIG. 1 is a schematic diagram of the basic structure of a photon generating device capable of switching multi-format chirp waveforms in response to a decrease in dispersion-resistant power in accordance with the present invention;
fig. 2 is a time domain waveform diagram, time-frequency diagram and electric spectrum diagram of down-chirp, double-chirp, up-chirp waveforms generated by the implementation of the present invention;
fig. 3 is a time-frequency diagram and an electric diagram of an up-chirp waveform transmitted by an optical fiber after down-chirp and double-chirp generated by the implementation of the present invention;
fig. 4 is a time-frequency diagram and an electric spectrum diagram of an up-chirp waveform after passing through an attenuator having the same transmission loss as an optical fiber, wherein the down-chirp and the double-chirp are generated by the implementation of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention, specific embodiments of the present invention will be described below with reference to the accompanying drawings.
As shown in fig. 1, the embodiment of the invention provides a photon generating device capable of switching multi-format chirp waveforms and resisting dispersion power attenuation, which comprises a laser 1, a dual-drive dual-parallel mach-zehnder modulator 2 (including a sub-modulator 2a and a sub-modulator 2 b), a first 90 ° bridge 6, a second 90 ° bridge 7, a single-mode fiber 3, a photodetector 4, a band-pass filter 5 and a power control unit 8. The laser output by the laser 1 is input into the double-drive double-parallel Mach-Zehnder modulator 2, the radio frequency signal is divided into two paths with 90-degree phase difference by the first 90-degree bridge 6 and is respectively loaded into the upper and lower radio frequency input ports of the sub-modulator 2a, and the single chirp signal is divided into two paths with 90-degree phase difference by the second 90-degree bridge 7 and is respectively loaded into the upper and lower radio frequency input ports of the sub-modulator 2 b; the double-drive double-parallel Mach-Zehnder modulator is connected with a single-mode fiber 3, and the single-mode fiber 3 is connected with a band-pass filter 5 through a photoelectric detector 4; the power control unit 8 controls the dc bias points of the sub-modulator 2b to operate in the single sideband modulation mode, and switches the generation of the down-chirp, double-chirp, up-chirp waveforms by adjusting the dc bias points of the sub-modulator 2a and the main modulator 2, and the generated waveforms have the function of resisting dispersion power attenuation.
In this embodiment, the 90 bridge acts as a shunt and phase shift, which may be replaced by other shunt and phase shift devices. The power supply control unit is an automatic bias point control circuit and can be composed of different adjustable direct current voltage sources.
The dual drive dual parallel mach-zehnder modulator 2 has three dc bias inputs, where the input voltage for the bias 2 ideal state is equal toV π For the half-wave voltage of the modulator, i.e. sub-modulator 2a to operate at the quadrature bias point, bias 1, bias 3 are ideally adjusted according to the required up-chirp, double-chirp or up-chirp waveform, the input is controlled by the power control unit 8.
If the down-chirp waveform is to be generated, the phase shifts caused by the bias 1 and the bias 3 are respectivelyAnd pi; if a double chirp waveform is to be generated, the phase shifts caused by bias 1 and bias 3 are +.>And->m 1 Is the modulation factor of the radio frequency signal, J n () Representing a first class of Bessel functions; if up-chirp waveform is to be generated, the phase shift caused by bias 1 and bias 3 is +.>
The specific principle is described as follows: assume that the optical field of the input optical signal isE 0 And omega 0 The amplitude and the angular frequency of the laser signal are respectively, and the radio frequency signal is V 1 cos(ω 1 t),V 1 And omega 1 The amplitude and the angular frequency of the radio frequency signal are respectively, and the single chirp signal is V 2 cos(ω 2 t+kt 2 ),V 2 、ω 2 And k are the amplitude, angular frequency, and chirp rate of the single chirp signal, respectively.
The sub-modulator 2a outputs the optical signal field expression:
wherein,for the phase shift caused by bias 1, m 1 ＝πV 1 /V π Is the modulation factor of the radio frequency signal, J n () Representing a first type of bessel function.
The sub-modulator 2b outputs the optical signal field expression:
wherein m is 2 ＝πV 2 /V π Is the modulation factor of the radio frequency signal.
The optical field expression of the optical signal output by the dual-drive dual-parallel mach-zehnder modulator is:
wherein,for the phase shift caused by bias 3. If m is 1 ＝m 2 ，ω 1 ＝2ω 2 The optical field of the optical signal output by the dual-drive dual-parallel mach-zehnder modulator can be expressed as:
after transmission over long distances of optical fiber, the optical field of the output optical signal can be expressed as
Wherein θ 0 And theta -1 The phase shift, gamma, caused by the optical carrier signal, the-1 order Shan Zhaojiu signal, modulating the optical sideband dispersion, respectively 1 And gamma -1 The phase shift caused by the band dispersion of the 1-order and-1-order radio frequency modulation light is respectively obtained by applying a Taylor formula according to a propagation constant beta:
θ 0 ＝Lβ 0 (ω 0 )
after passing through the photodetector, the signal can be filtered to contain only the center frequency at ω by using a bandpass filter 2 The photocurrent can be expressed as
Wherein,and->
When (when)The output photocurrent can be expressed as
i(t)∝J 1 (m 1 ) 2 cos(ω 2 t+kt 2 +a 1 +θ 0 -θ -1 )
+J 1 (m 1 ) 2 cos(ω 2 t-kt 2 +a 3 +θ -1 -γ -1 )
When (when) The output photocurrent can be expressed as
i(t)∝J 1 (m 1 ) 2 cos(ω 2 t-kt 2 +π+θ -1 -γ -1 )
When (when)The output photocurrent can be expressed as
It can be seen that whenA down-chirp waveform may be generated; when-> A double chirp waveform may be generated; when->When an up-chirp waveform is generated. It can be seen that the phase shift caused by dispersion only affects the phase of the generated signal and not the amplitude. In other words, the power attenuation caused by the down-chirp, the double-chirp and the up-chirp transmission is eliminated.
The invention can realize the generation of the switchable multi-format chirp waveform with weak anti-dispersion power.
The above description is merely of preferred embodiments of the present invention, and the scope of the present invention is not limited to the above embodiments, but all equivalent modifications or variations according to the present disclosure will be within the scope of the claims.
Claims (3)
1. The photon generating device capable of resisting dispersion power weakness and switching multi-format chirp waveforms is characterized by comprising a laser (1), a dual-drive dual-parallel Mach-Zehnder modulator (2), a single-mode optical fiber (3), a photoelectric detector (4), a band-pass filter (5), a first 90-degree bridge (6), a second 90-degree bridge (7) and a power supply control unit (8); the dual-drive dual-parallel Mach-Zehnder modulator (2) comprises a first sub-modulator (2 a) and a second sub-modulator (2 b); the laser output by the laser (1) is input into a dual-drive dual-parallel Mach-Zehnder modulator (2); the radio frequency signal is divided into two paths of radio frequency input ports with 90 degrees phase difference respectively loaded to a first sub-modulator (2 a) through a first 90-degree electric bridge (6), and the single chirp signal is divided into two paths with 90 degrees phase difference respectively loaded to two radio frequency input ports of a second sub-modulator (2 b) through a second 90-degree electric bridge (7); the dual-drive dual-parallel Mach-Zehnder modulator (2) is connected with a single-mode fiber (3), and the single-mode fiber (3) is connected with a band-pass filter (5) through a photoelectric detector (4); the power supply control unit (8) controls the direct current bias point of the sub-modulator II (2 b) to work in a single sideband modulation mode, and the generation of down-chirp, double-chirp and up-chirp waveforms is switched by adjusting the direct current bias points of the sub-modulator I (2 a) and the double-drive double-parallel Mach-Zehnder modulator (2);
the dual drive dual parallel Mach-Zehnder modulator (2) has three DC bias inputs, wherein the input voltage of the bias 2 under ideal conditions is equal toV π For half-wave voltage of the modulator, namely, the second sub-modulator (2 b) works at an orthogonal bias point, the bias 1 and the bias 3 are adjusted according to the required up-chirp, double-chirp or up-chirp waveforms in an ideal state, and the input is controlled by a power supply control unit (8);
the phase shifts caused by bias 1 and bias 3 are respectivelyAnd pi, generating a down-chirp waveform; the phase shift caused by bias 1 and bias 3 is +.>And->m 1 Is the modulation factor of the radio frequency signal, J n () Representing a Bessel function of a first type, and generating a double-chirp waveform; the phase shift caused by bias 1, bias 3 is +.>An up-chirp waveform is generated.
2. A photon generating device for resisting dispersion power attenuation and switching multi-format chirp waveforms as claimed in claim 1, characterized in that said power supply control unit (8) is a bias point automatic control circuit.
3. A photon generating device as claimed in claim 2, wherein said power control unit (8) is constituted by different adjustable dc voltage sources.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111120571.5A CN113922878B (en) | 2021-09-24 | 2021-09-24 | Photon generating device capable of resisting dispersion power weakening and switching multi-format chirp waveforms |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111120571.5A CN113922878B (en) | 2021-09-24 | 2021-09-24 | Photon generating device capable of resisting dispersion power weakening and switching multi-format chirp waveforms |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113922878A CN113922878A (en) | 2022-01-11 |
| CN113922878B true CN113922878B (en) | 2024-02-02 |
Family
ID=79235993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111120571.5A Active CN113922878B (en) | 2021-09-24 | 2021-09-24 | Photon generating device capable of resisting dispersion power weakening and switching multi-format chirp waveforms |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113922878B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109581301A (en) * | 2018-12-03 | 2019-04-05 | 杭州电子科技大学 | Double chirp frequency doubling signal generating devices and its method based on double-parallel modulator |
| CN110017967A (en) * | 2019-03-04 | 2019-07-16 | 电子科技大学 | A kind of electro-optic intensity modulator chirp parameter test method based on phase bit comparison |
| CN112152720A (en) * | 2020-09-25 | 2020-12-29 | 中国科学院半导体研究所 | Multi-band double-chirp microwave signal generation and anti-fiber dispersion transmission system and method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4547552B2 (en) * | 2005-08-31 | 2010-09-22 | 独立行政法人情報通信研究機構 | DSB-SC modulation system capable of erasing carriers and secondary components |
-
2021
- 2021-09-24 CN CN202111120571.5A patent/CN113922878B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109581301A (en) * | 2018-12-03 | 2019-04-05 | 杭州电子科技大学 | Double chirp frequency doubling signal generating devices and its method based on double-parallel modulator |
| CN110017967A (en) * | 2019-03-04 | 2019-07-16 | 电子科技大学 | A kind of electro-optic intensity modulator chirp parameter test method based on phase bit comparison |
| CN112152720A (en) * | 2020-09-25 | 2020-12-29 | 中国科学院半导体研究所 | Multi-band double-chirp microwave signal generation and anti-fiber dispersion transmission system and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113922878A (en) | 2022-01-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110031832B (en) | Microwave photon Doppler frequency shift measurement system and adjusting method thereof | |
| CN103095378B (en) | Based on DE-MZM automatic bias control device and the control method of PID | |
| CN109387833B (en) | MIMO radar detection method and device based on microwave photon orthogonal difference frequency multiplexing | |
| CN112152720B (en) | Multi-frequency-band double-chirp microwave signal generation and optical fiber dispersion resistant transmission system and method | |
| CN106027153B (en) | A method for generating 60GHz millimeter waves based on a novel double-sideband Mach-Zehnder modulator | |
| CN107094052A (en) | Optics produces the device of radar pulse compression signal | |
| CN113098618A (en) | Optical generation method of dual-band phase coding signal | |
| CN111130643B (en) | Microwave photonic phase shifting device and method with no optical filtering and adjustable frequency doubling factor | |
| CN108418638A (en) | Triangular Wave Generation Method Based on Dual Polarization Quadrature Phase Shift Keying Modulator | |
| CN114879218A (en) | Laser and radio frequency composite radar detection method and device | |
| CN109302251A (en) | A satellite spectrum sensing method and system based on equal-amplitude and equal-spaced multi-wavelength light sources | |
| CN113972953B (en) | Triangular waveform generator based on two single-drive Mach-Zehnder modulators | |
| CN113922878B (en) | Photon generating device capable of resisting dispersion power weakening and switching multi-format chirp waveforms | |
| US7526209B2 (en) | Optical frequency shift keying modulator | |
| CN112285732B (en) | Photon-assisted Doppler radar detection method and device | |
| CN112242872B (en) | Method for generating double-frequency triangular wave and square wave of polarization shunt multiplexing Mach-Zehnder modulator | |
| CN109639364A (en) | A kind of multichannel arbitrary carry system phase-coded signal optics generation device and production method | |
| CN114142889B (en) | Reconfigurable broadband high-frequency hopping signal generation method | |
| CN112816963B (en) | A microwave photon dual-phase coded signal generator | |
| CN115412172A (en) | A method for integrating functions of microwave photonic radar transceiver terminals based on polarization multiplexing | |
| CN113949459A (en) | An optoelectronic hybrid FSK signal generation system and method based on intensity modulator and MZI cascade | |
| Zhu et al. | A background-free phase-coded microwave pulse generator by optoelectronic oscillation | |
| CN110830122B (en) | Radio frequency phase coding signal generation device and method based on microwave photon technology | |
| Qu et al. | Photonic-Assisted Generation of Flexible and Switchable Multi-Band Linearly Frequency Modulated Microwave Waveforms | |
| CN115469329B (en) | Modularized high-resolution situation awareness radar based on microwave photon technology |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |