CN106961252A - Microwave photon mirror image suppresses down-conversion device and method - Google Patents
Microwave photon mirror image suppresses down-conversion device and method Download PDFInfo
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- CN106961252A CN106961252A CN201710126336.6A CN201710126336A CN106961252A CN 106961252 A CN106961252 A CN 106961252A CN 201710126336 A CN201710126336 A CN 201710126336A CN 106961252 A CN106961252 A CN 106961252A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/16—Multiple-frequency-changing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
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Abstract
Suppress down-conversion device and method the invention discloses a kind of microwave photon mirror image, this method is related to microwave technical field and technical field of photo communication.Methods described as shown in drawings, including laser diode (LD), double parallel horse once modulator (DPMZM), wavelength division multiplexer (WDM), photodetector (PD), orthocoupler (Hybrid).This method utilizes DPMZM modulated RFs (RF) and local oscillator (LO) signal, MAIN MUX offset angle is set to 45 degree, optical sideband it will be separated up and down by WDM, intermediate frequency (IF) signal for the image frequency component that is inhibited after photodetection, Hybrid couplings.The present invention is simple in construction, and working band is wide, and image rejection ratio is high.
Description
Technical field
The present invention relates to microwave technical field and technical field of photo communication, relate generally to microwave photon mirror image and suppress down coversion
Technology.
Background technology
The electronic systems such as broadband wireless communications, radar, electronic warfare just develop towards big bandwidth, wide-band direction.Microwave light
Sub- technology handles microwave signal by photonic propulsion means, a series of with big instant bandwidth, wide working band, electromagnetism interference etc.
Advantage, has huge applications potentiality in future electronic systems.
In radio-frequency transmitter, image frequency component is interfered after down coversion to desired signal, it is therefore necessary to entered
Row suppresses.Traditional image rejection techniques include suppressing low-converter using image-reject filter or mirror image, and latter of which is kept away
Exempt from the use of high q-factor wave filter, it is simple in construction, be easily integrated.But traditional microwave mirror suppresses low-converter one side band
Width is limited, electromagnetic interference is serious, and on the other hand due to width phase mismatch problems, image rejection ratio is not high.
The advantage such as small is relied on using the big bandwidth of microwave photon technology, frequency, construction microwave photon mirror image suppresses down coversion system
System, it is contemplated that improve the width degree of balancing each other in broadband, improves image rejection ratio.Have at present under a small amount of microwave photon mirror image suppression
Variable-frequency solutions report, but mostly as a result of frequency dependence devices such as micro-wave coupler, electric phase shifter, Dispersive Devices, its
Working frequency range, image rejection ratio are still limited.
The content of the invention
The problem of in order to solve in the presence of background technology, the present invention proposes a kind of based on double parallel horse once modulator
(DPMZM) microwave photon mirror image suppresses down-conversion device and method.The device optically constructs double down coversions and led to
Road, can be set to orthogonal by modulator bias point by the phase of two passages, so that quadrature frequency conversion is realized, with reference to orthogonal coupling
Device (Hybrid), you can realize that mirror image suppresses down coversion.The Hybrid for handling intermediate-freuqncy signal is gone out, the device passes through full light
Method is realized, therefore the working frequency with ultra-wide.Realize binary channels down coversion by way of common modulation device, and passage
Phase difference can be by biasing continuous tuning, therefore image rejection ratio is high.
The technical solution adopted in the present invention is：Described device includes laser diode (LD), DPMZM, wavelength division multiplexer
(WDM), two photodetectors (PD).LD delivery outlet connects DPMZM optical signal input；DPMZM light signal output ends
Connect WDM public input；WDM two output ends connect two PD, PD output electric signals and coupled by Hybrid respectively,
Mono- output end output of Hybrid suppresses intermediate frequency (IF) signal of image frequency component.
The DPMZM by a Y types beam splitter, up and down in parallel two horses once modulator (being designated as X-MZM, Y-MZM),
One Y types optical combiner composition.X-MZM, Y-MZM and MAIN MUX have a bias voltage port respectively.
The present invention operationally comprises the following steps：
(1) from the LD continuous light carriers exported are injected into DPMZM；
(2) radio frequency (RF) signal connects X-MZM prevention at radio-frequency port, and local oscillator (LO) signal connects Y-MZM prevention at radio-frequency port；
(3) X-MZM and Y-MZM are biased in smallest point, and the offset angle of MAIN MUX is 45 degree；
(4) optical signal of modulator output enters WDM, and WDM constructs the bandpass filter of two adjacent pass-bands, and output RF and LO are adjusted
The upper side band and lower sideband being made；
(5) two ways of optical signals respectively enters PD, photodetection output I/Q two-way IF signals；
(6) two-way IF signals are coupled by Hybrid, and output suppresses the IF signals of image frequency component.
The present invention proposes a microwave photon mirror image and suppresses down-conversion device and method, and the device is realized using DPMZM
Optical sideband above and below the Electro-optical Modulation of RF and LO signals, WDM separation, by adjusting DPMZM main offset angle, is obtained after photodetection
Orthogonal IF signals, realize that image frequency component suppresses after being coupled by Hybrid.The present invention is simple in construction, with it is very strong can
Operability.
X-MZM and Y-MZM are operated in smallest point in the present invention, to improve the purity of frequency spectrum of IF signals.
The conversion gain of two passages can be by optical attenuator flexible modulation in the present invention, and the phase differences of two passages can be with
Continuously adjusted by the main offset angle of modulator, therefore the degree of balance of two-way amplitude and phase can be improved, improve image rejection ratio.
Brief description of the drawings
Fig. 1 is that microwave photon mirror image of the present invention suppresses down-conversion device and the schematic diagram of method；
The frequency spectrum of two passband responses that Fig. 2 (a) is WDM in embodiment and the optical signal into WDM；
Fig. 2 (b) is the two ways of optical signals frequency spectrum of WDM outputs in embodiment；
The experimental results that Fig. 3 (a) changes for image rejection ratio in embodiment with LO frequencies；
The experimental results that Fig. 3 (b) changes for image rejection ratio in embodiment with IF frequencies.
Embodiment
Embodiments of the invention are elaborated below in conjunction with the accompanying drawings：The present embodiment using technical solution of the present invention before
Put and implemented, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to down
The embodiment stated：
In this example, device includes：LD, DPMZM, WDM, two PD, Hybrid, two microwave signal sources, dc sources.LD's
Delivery outlet is connected by polarization maintaining optical fibre with DPMZM optical input, the output ends of two microwave signal sources connect respectively X-MZM and
Y-MZM rf inputs, modulator output end is connected with the public inputs of WDM, and two output ends of WDM connect two respectively
The electric signal of PD, PD output is coupled by Hybrid.
In this example, the specific implementation step of method is：
Step one：The continuous light carrier mean power that LD is produced is 16dBm, wavelength about 1552nm；The RF that microwave signal source is produced
Signal frequency is 40GHz, and power is 0dBm, and the LO signal frequencies of generation are 39.5GHz, and power is 10dBm；DPMZM half-wave
Voltage is about 3.5V, and band is wider than 30GHz, and extinction ratio is all higher than 30dB；WDM channel spacings are 50GHz, 3dB pass band widths
31GHz；PD bandwidth is about 1GHz, responsiveness 0.9A/W；Hybrid working frequencies 0.5-1GHz.
Step 2：The passband response of two adjacent pass-bands of WDM (CH1 and CH2) is tested first, such as two dotted line institutes in Fig. 2 (a)
Show, then adjust LD wavelength and place it in the two bandpass centers；
Step 3：Three biass of modulator are adjusted by direct voltage source, X-MZM and Y-MZM is operated in smallest point, main modulation
Device offset angle is 45 degree, shown in solid into WDM optical signal such as Fig. 2 (a), two ways of optical signals such as Fig. 2 (b) of WDM outputs
It is shown, it can be seen that lower sideband is separated；
Step 4：LO frequencies change to 39.5GHz with 1GHz steppings from 2.5GHz, and being corresponding in turn to adjustment RF frequency consolidates IF frequencies
It is set to 0.5GHz, by setting RF frequency 0.5GHz more high or low than LO, the IF of the 0.5GHz carrier frequency of Hybrid outputs is measured respectively
Signal power, that is, correspond to signal and image frequency component power, image rejection ratio is with LO frequency variation curves such as Fig. 3 (a) institutes
Show, it can be seen that image rejection ratio is higher than 50dB in 4.5-39.5GHz frequency ranges；
Step 5：Fixed LO frequencies are 39.5GHz, and RF frequency is changed with 0.1GHz steppings from 39.6 to 40GHz, measures IF signals
Power, is corresponding desired signal power；Then RF frequency is changed with 0.1GHz steppings from 39.4 to 39GHz, measures IF signals
Power, is that corresponding mirror image suppresses component power；Image rejection ratio can be seen with shown in change curve such as Fig. 3 (b) of IF frequencies
To when IF frequencies change from 0.5GHz to 1GHz, image rejection ratio is maintained at more than 50dB.
In this example, image rejection ratio can be calibrated by the luminous power of MAIN MUX offset angle and two-way.
To sum up, microwave photon mirror image of the present invention suppresses down-conversion device and method, is simply easily achieved, with obvious band
Wide advantage, image rejection ratio is high.
In a word, embodiments described above is only embodiments of the invention, is not only used for limiting the guarantor of the present invention
Protect scope, it is noted that for those skilled in the art, can be with present disclosure
Some equivalent variations and replacement are made, RF, LO and IF frequency, optical carrier wavelength, WDM pass band widths etc. can all change.These etc.
The scope of protection of the invention is also should be regarded as with deformation and replacement and the adjustment of frequency range.
Claims (2)
1. microwave photon mirror image suppresses down-conversion device and method, it is characterised in that：The output end connection double flat of laser (LD)
Once the input of modulator (DPMZM), radio frequency (RF) signal and local oscillator (LO) signal connect DPMZM two radio frequencies to row horse respectively
Port, the public input of DPMZM output end connection wavelength division multiplexer (WDM), WDM two output ends connect two respectively
Photoelectric detector (PD), two photodetectors connect two input ports of orthocoupler (Hybrid)；
The WDM separates the lower sideband of optical signal as two adjacent bandpass filters of passband；
The main offset angle for adjusting DPMZM is 45 degree, then orthocoupler output port output suppresses image frequency component
Intermediate frequency (IF) signal.
2. microwave photon mirror image according to claim 1 suppresses down-conversion device and method, it is characterised in that：Mirror image suppresses
Than can the main offset angle by DPMZM, the luminous power into two PD be adjusted.
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Cited By (9)
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| 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 |
| 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 |
| CN111478734A (en) * | 2019-01-24 | 2020-07-31 | 西安电子科技大学 | Low intermediate frequency photon broadband radio frequency receiving method based on K-K detection |
| CN111641461A (en) * | 2019-03-01 | 2020-09-08 | 西安电子科技大学 | Filtering-free image rejection down-conversion method based on cascade modulator |
| CN111752064A (en) * | 2019-03-26 | 2020-10-09 | 中国科学院半导体研究所 | Phase-adjustable imaginary part down-conversion suppression device and method |
| CN112311469A (en) * | 2019-07-30 | 2021-02-02 | 华为技术有限公司 | Microwave photon down converter and microwave receiving system based on DPMZM |
| CN112564811A (en) * | 2020-12-13 | 2021-03-26 | 西北工业大学 | Microwave photon I/Q down-conversion device with large dynamic range and adjusting method |
| CN112929087A (en) * | 2021-01-28 | 2021-06-08 | 中国科学院半导体研究所 | Image frequency suppression mixing transmission method and device |
| CN114826428A (en) * | 2022-03-03 | 2022-07-29 | 北京邮电大学 | Linear microwave photon link for image rejection down-conversion |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN111478734B (en) * | 2019-01-24 | 2021-08-20 | 西安电子科技大学 | Low intermediate frequency photon broadband radio frequency receiving method based on K-K detection |
| CN111478734A (en) * | 2019-01-24 | 2020-07-31 | 西安电子科技大学 | Low intermediate frequency photon broadband radio frequency receiving method based on K-K detection |
| CN111641461B (en) * | 2019-03-01 | 2021-10-15 | 西安电子科技大学 | Filtering-free image rejection down-conversion method based on cascade modulator |
| CN111641461A (en) * | 2019-03-01 | 2020-09-08 | 西安电子科技大学 | Filtering-free image rejection down-conversion method based on cascade modulator |
| CN111752064A (en) * | 2019-03-26 | 2020-10-09 | 中国科学院半导体研究所 | Phase-adjustable imaginary part down-conversion suppression device and method |
| CN112311469A (en) * | 2019-07-30 | 2021-02-02 | 华为技术有限公司 | Microwave photon down converter and microwave receiving system based on DPMZM |
| CN112311469B (en) * | 2019-07-30 | 2021-12-31 | 华为技术有限公司 | Microwave photon down converter and microwave receiving system based on DPMZM |
| CN112564811A (en) * | 2020-12-13 | 2021-03-26 | 西北工业大学 | Microwave photon I/Q down-conversion device with large dynamic range and adjusting method |
| CN112564811B (en) * | 2020-12-13 | 2023-11-10 | 西北工业大学 | Large dynamic range microwave photon I/Q down-conversion device and adjusting method |
| CN112929087A (en) * | 2021-01-28 | 2021-06-08 | 中国科学院半导体研究所 | Image frequency suppression mixing transmission method and device |
| CN114826428A (en) * | 2022-03-03 | 2022-07-29 | 北京邮电大学 | Linear microwave photon link for image rejection down-conversion |
| CN114826428B (en) * | 2022-03-03 | 2023-11-21 | 北京邮电大学 | Image-suppressed down-conversion linearization microwave photon link system |
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