CN106953699B - The method of photonics wide-band microwave single sideband modulation - Google Patents
The method of photonics wide-band microwave single sideband modulation Download PDFInfo
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- CN106953699B CN106953699B CN201611010634.0A CN201611010634A CN106953699B CN 106953699 B CN106953699 B CN 106953699B CN 201611010634 A CN201611010634 A CN 201611010634A CN 106953699 B CN106953699 B CN 106953699B
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- 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
Abstract
The invention discloses a kind of method of photonics wide-band microwave single sideband modulation, this method is related to microwave technical field and technical field of photo communication.The method is as shown in the picture, including laser LD, palarization multiplexing double parallel horse once modulator PDM-DPMZM, optical band pass filter OBPF, photoelectric detector PD, microwave orthocoupler Hybrid, microwave power distributor.This method constructs a pair of orthogonal upconverter using PDM-DPMZM and OBPF, by orthogonal intermediate-frequency IF signal by obtaining the radio frequency rf signal of only upper side band or lower sideband after PD beat frequency after local oscillator LO signal up-conversion.The configuration of the present invention is simple with roomy, while having higher inhibition ratio to sideband and carrier wave.
Description
Technical field
The present invention relates to microwave technical fields and technical field of photo communication, relate generally to photonics wide-band microwave single-side belt tune
Technology processed.
Background technique
Single sideband modulation has many advantages, such as to save band resource, small power consumption, have in the electronic systems such as radar, wireless communication
There is wide application.
The core devices of traditional microwave signal single side-band modulator are microwave mixer and phase shifter, there are bandwidth by
Limit, the problems such as electromagnetic interference is serious, can cause carrier wave leakage, side additionally, due to microwave mixer asymmetry, phase shifter error etc.
Band inhibit than it is poor the problems such as.
Optic communication at present and optical signal processing technology development are swift and violent, microwave signal mixing and phase shift technology based on photonics
Have many advantages, such as that instant bandwidth is big, frequency tuning is good, without electromagnetic interference, has obtained extensive research.But photonics broadband is micro-
The rare people's research of wave single sideband modulation technique.
Summary of the invention
A kind of method that the present invention proposes photonics wide-band microwave single sideband modulation.This method utilizes palarization multiplexing double parallel
Once modulator PDM-DPMZM constructs a pair of orthogonal upconverter to horse, in conjunction with medium-frequency IF orthocoupler, can be obtained with up-conversion
The only radio frequency rf signal of upper side band or lower sideband.In the invention, the frequency of IF and local oscillator LO signal can be in a wide range of interior tune
Superiority bandwidth that is humorous, being unable to reach with traditional microwave single side-band modulator.The phase difference of two up-conversion signals can be accurate
Ground is adjusted to 90 degree, inhibits ratio to improve sideband.In addition IF and LO is modulated using suppressed carrier in the invention, and carrier wave can be improved
Inhibit ratio.
The technical scheme adopted by the invention is that: described device includes laser LD, PDM-DPMZM, optical band pass filter
OBPF, photoelectric detector PD, microwave orthocoupler Hybrid, microwave power distributor.The delivery outlet connection PDM-DPMZM's of LD
Optical signal input；The input terminal of the light signal output end connection OBPF of PDM-DPMZM；The output end of OBPF connects PD.
The PDM-DPMZM was once modulated by a beam splitter, two double parallel horses for being denoted as X, Y respectively in parallel up and down
Device DPMZM and polarization beam combiner PBC is constituted, there are two horse in parallel once modulator MZM inside first DPMZM, point
It is not denoted as Xa, Xb, two MZM inside second DPMZM are denoted as Ya, Yb, and the main offset angle of two DPMZM is denoted as θxAnd θy。
The present invention at work the following steps are included:
(1) it is injected into PDM-DPMZM from the continuous light carrier that LD is exported；
(2) IF signal is divided into two quadrature components by orthocoupler, the radio-frequency head of 0 degree of component connection Xa, and 90 degree points
The radio band of amount connection Ya, LO signal function divide two-way, and two-way is separately connected the radio-frequency head of Xb and Yb；
(3) Dc bias is provided to four MZM, four MZM is made to work in smallest point；
(4) the modulated optical signal of upper and lower two-way is complex as palarization multiplexing light by the PBC inside PDM-DPMZM, and output is adjusted
Device processed；
(5) palarization multiplexing optical signal enters OBPF, filters out lower sideband or upper side band that a LO modulation generates, leaves behind one
The lower sideband of a LO sideband and IF signal modulation；
(6) filtered optical signal enters PD, and a RF signal is exported after palarization multiplexing optical signal photodetection；
(7) the main offset angle for adjusting two DPMZM makes θxCompare θy90 degree big, then PD beat frequency exports upper side band usb signal, under
Sideband LSB and carrier wave Carrier is suppressed；
(8) the main offset angle for adjusting two DPMZM makes θxCompare θy90 degree small, then PD beat frequency exports lsb signal, USB and carrier wave
It is suppressed.
The invention proposes a kind of method of photonics wide-band microwave single sideband modulation, the program is real using PDM-DPMZM
The Electro-optical Modulation of existing IF and LO signal, OBPF filter out a LO sideband, and by adjusting the main offset angle of two DPMZM, photoelectricity is visited
The RF vector signal of only LSB or only USB are obtained after survey.The configuration of the present invention is simple has very strong operability.
IF and LO signal uses suppressed carrier modulation system in this programme, and obtained RF vector signal carrier wave is suppressed.
Since the phase difference of IQ two-way upconverter in the program can continuously be appointed by two main offset angles of modulator
Meaning is adjusted, and it is hereby ensured that two upconverter phase strict orthogonals, and orthogonal phase does not become with IF and LO frequency
Change, the RF vector signal sideband obtained from inhibits relatively good.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram of the method for photonics wide-band microwave single sideband modulation of the present invention；
Fig. 2 is the spectrogram of OBPF filtering front and back and the passband curve of OBPF；
Fig. 3 (a) is the lsb signal frequency spectrum generated under LO frequency 40GHz, IF frequency 2GHz；
Fig. 3 (b) is the usb signal frequency spectrum generated under LO frequency 40GHz, IF frequency 2GHz.
Specific embodiment
Elaborate with reference to the accompanying drawing to the embodiment of the present invention: the present embodiment before being with technical solution of the present invention
It puts and is implemented, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to down
The embodiment stated:
Fig. 1 is the schematic diagram of a kind of method of photonics wide-band microwave single sideband modulation.In this example, device includes:
LD, PDM-DPMZM, OBPF, PD, two microwave signal sources, microwave orthocoupler, microwave power distributor.The delivery outlet of LD passes through
Polarization maintaining optical fibre is connected with the optical input of PDM-DPMZM, and first microwave signal source exports IF signal, after orthocoupler
The rf inputs of Xa and Ya are separately connected, microwave signal source output LO signal is connected with microwave power distributor common end, microwave function
It is divided to two delivery outlets of device to be connected respectively with the rf input port of Xb and Yb, PDM-DPMZM output end and image intensifer input terminal phase
Even, image intensifer output end is connected with OBPF input terminal, and OBPF output end is connected with PD input terminal.
In this example, the specific implementation step of method is:
Step 1: the continuous light wave operation wavelength that LD is generated is 1552nm, mean power 15dBm；IF signal frequency
2GHz, power 9dBm；LO signal frequency is 40GHz, power 15dBm；Four MZM bands of PDM-DPMZM are wider than 40GHz,
Half-wave voltage is about 3.5V, and extinction ratio is all larger than 30dB；The central wavelength 1552.2nm of OBPF, three dB bandwidth 0.4nm；The band of PD
It is wider than 40GHz, responsiveness 0.6A/W；
Step 2: upper Dc bias is supplied to modulator by DC voltage source, so that four MZM work in smallest point；
Step 3: two main offset angles are adjusted by DC voltage source, make θxCompare θyIt is 90 degree small；
Step 4: optical signal spectrum before and after measurement OBPF, as shown in Figure 2, it can be seen that and after OBPF, LO signal tune
The lower sideband of system is suppressed 25dB or more, and no matter before and after OBPF, the carrier wave of optical signal is suppressed；
Step 5: the RF signal that PD is obtained enters frequency spectrograph, and shown in experimental result such as Fig. 3 (a), obtaining frequency is 38GHz
Lsb signal, wherein the carrier wave of frequency 40GHz is suppressed 27.4dB, and the USB of frequency 42GHz is suppressed 23.3dB；
Step 6: two main offset angles are adjusted by DC voltage source, make θxCompare θy90 degree small, other to remain unchanged, PD is obtained
Shown in the RF signal spectrum such as Fig. 3 (b) arrived, the usb signal that frequency is 42GHz is obtained, wherein the carrier wave of frequency 40GHz is suppressed
The LSB of 29.2dB, frequency 38GHz are suppressed 26.9dB.
In this example, the phase balance of quad upconverter can be calibrated by adjusting two main offset angles, from
And inhibit sideband to the greatest extent.
To sum up, a kind of method of photonics wide-band microwave single sideband modulation of the present invention, structure are simply easily achieved, sideband and
Suppressed carrier system is high, has big superiority bandwidth, not by electromagnetic interference.
In short, embodiments described above is only the embodiment of the present invention, not it is only used for limiting guarantor of the invention
Protect range, it is noted that for those skilled in the art, can be in present disclosure
Several equivalent variations and replacement are made, LO frequency, IF frequency are all changeable.These equivalent variations and replacement and frequency range
Adjustment also should be regarded as the scope of protection of the invention.
Claims (2)
1. a kind of method of photonics wide-band microwave single sideband modulation, including laser LD, palarization multiplexing double parallel horse were once modulated
Device PDM-DPMZM, optical band pass filter OBPF, photoelectric detector PD, microwave orthocoupler Hybrid, microwave power distributor；Its
Be characterized in that, the input terminal of the output end of LD connection PDM-DPMZM, the output end connection OBPF of PDM-DPMZM input terminal,
The output end of OBPF connects PD, the PDM-DPMZM by a beam splitter, two double parallel horses in parallel once modulator up and down
DPMZM and polarization beam combiner PBC is constituted；There are two horse in parallel once modulator MZM inside first DPMZM, it is denoted as
Xa, Xb, two MZM inside second DPMZM are denoted as Ya, Yb, and four MZM work in smallest point；Intermediate-freuqncy signal passes through micro-
Wave orthocoupler is divided into two quadrature components, and 0 degree of component is loaded into the radio frequency mouth of Xa, and 90 degree of components are loaded into the radio frequency of Ya
Mouthful, local oscillator LO signal is divided into two-way by microwave power distributor, is loaded into the radio frequency mouth of Xb and Yb respectively；OBPF is for filtering out LO tune
One sideband of system；The main offset angle for adjusting first DPMZM keeps its than second main offset angle of DPMZM 90 degree small, claps through PD
Lower sideband signal is generated after frequency, upper side band and carrier wave are suppressed, adjust the main offset angle of first DPMZM, make it than second
The main offset angle of DPMZM is 90 degree big, and upper side band signal is generated after PD beat frequency, and lower sideband and carrier wave are suppressed.
2. a kind of method of photonics wide-band microwave single sideband modulation according to claim 1, which is characterized in that Ke Yitong
The main offset angle for overregulating two DPMZM makes two upconverter strict orthogonals, and then improves sideband and inhibit ratio.
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| CN107528638B (en) * | 2017-07-27 | 2019-12-10 | 西安电子科技大学 | Broadband microwave signal arrival angle estimation method based on microwave photon filtering |
| CN109842451B (en) * | 2017-11-25 | 2021-10-15 | 西安电子科技大学 | Method for realizing microwave signal photonics frequency conversion and multi-channel phase shift by using dual-polarization quadrature phase shift keying modulator |
| CN108282229B (en) * | 2017-12-20 | 2019-10-18 | 西安空间无线电技术研究所 | A kind of high-order optical carrier suppression single sideband singal generation unit and implementation method |
| CN108616307A (en) * | 2018-03-01 | 2018-10-02 | 上海卫星工程研究所 | The frequency converter based on microwave photon technology applied to geostationary orbit satellite |
| CN108761437B (en) * | 2018-04-08 | 2020-07-03 | 南京航空航天大学 | Microwave photon full polarization radar detection method and microwave photon full polarization radar |
| CN109861645B (en) * | 2019-01-04 | 2024-02-13 | 武汉邮电科学研究院有限公司 | Frequency multiplier for microwave broadband communication |
| CN111786742B (en) * | 2019-04-03 | 2021-08-20 | 西安电子科技大学 | Method for generating microwave photon broadband vector signal |
| CN110220540A (en) * | 2019-05-10 | 2019-09-10 | 中国船舶重工集团公司第七一五研究所 | A kind of detection light generation system applied to distributive fiber optic strain demodulation |
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| CN105099558A (en) * | 2015-07-29 | 2015-11-25 | 西安电子科技大学 | Frequency octupling millimeter wave generation device by means of DP-QPSK modulator and method thereof |
| CN105162523A (en) * | 2014-06-14 | 2015-12-16 | 西安电子科技大学 | Apparatus of generating microwave phase coding signals in an optical manner |
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| CN105162523A (en) * | 2014-06-14 | 2015-12-16 | 西安电子科技大学 | Apparatus of generating microwave phase coding signals in an optical manner |
| CN105099558A (en) * | 2015-07-29 | 2015-11-25 | 西安电子科技大学 | Frequency octupling millimeter wave generation device by means of DP-QPSK modulator and method thereof |
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