CN106656335A - Microwave signal photonic frequency conversion and multichannel fiber transmission device and method - Google Patents
Microwave signal photonic frequency conversion and multichannel fiber transmission device and method Download PDFInfo
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- CN106656335A CN106656335A CN201610880057.4A CN201610880057A CN106656335A CN 106656335 A CN106656335 A CN 106656335A CN 201610880057 A CN201610880057 A CN 201610880057A CN 106656335 A CN106656335 A CN 106656335A
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
- H04B10/25758—Optical arrangements for wireless networks between a central unit and a single remote unit by means of an optical fibre
-
- 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
-
- 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
- H04B10/2587—Arrangements specific to fibre transmission using a single light source for multiple stations
-
- 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
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
-
- 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
-
- 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
- H04B10/564—Power control
Abstract
The invention discloses a microwave signal photonic frequency conversion and multichannel fiber transmission device and method realized by a polarization multiplexing modulator. The device, as shown by a figure, comprises a laser diode (LD), a polarization multiplexing Mach-Zehnder modulator (PDM-MZM), an erbium doped fiber amplifier (EDFA), a 1:N light splitter (Splitter), a polarizer (Pol), a polarization controller (PC), and a standard single-mode fiber (SMF) and a photoelectric detector (PD). The PDM-MZM is used to carry out carrier suppressed double side band modulation on radio frequency (RF) and local oscillation (LO) signals and then implement frequency mixing, and the RF and LO isolation degree of frequency conversion gain and frequency conversion signals is improved. Optical signals output by the modulator can be divided into multiple paths to implement fiber transmission, each path is adjusted via an independent polarization state, and power attenuation caused by dispersion can be compensated.
Description
Technical field
The present invention relates to microwave signal light in technical field of photo communication and microwave technical field, more particularly to optical communication technique
Son learns frequency conversion and multichannel optical fiber transmission.
Background technology
Internet era quantity of information rapidly increasing, the demand of media data flow is also continuously increased, and in addition smart mobile phone is general
And so that people are to the requirement in terms of the bandwidth and mobility of network also more and more higher.Under this background, light carries radio frequency
(Radio-over-Fiber, RoF) communication system have very big development prospect because it only have the big bandwidth of fiber optic communication,
Two-forty, the advantage of electromagnetism interference, are also equipped with radio communication access, the characteristics of mobility is strong, so RoF communications are not
Carry out the developing direction of broadband wireless communications.
In RoF communication systems, frequency transformation is wherein critically important part, due to the restriction of equipment, high-frequency microwave letter
Number only by being converted in suitable frequency range the signal processing that can just carry out follow-up area of light or electrical domain.Due to electronics
There is Bandwidth-Constrained, isolation are poor, electromagnetic interference is serious etc. based on the microwave frequency conversion of electronic technology in the restriction of device, tradition itself
Problem.Based on the microwave converter technique of photonic propulsion, using the big bandwidth of photonic propulsion, low-loss, high-isolation, the spy without electromagnetic interference
Point, can significantly improve the frequency conversion performance of microwave signal.
However, in conventional photonic propulsion frequency conversion system, the Electro-optical Modulation of radio frequency (RF) and local oscillator (LO) signal is bilateral
Band modulation, the photomixing signal after RF and LO modulation after fiber-optic transfer, due to fibre-optical dispersion, up-conversion after mixing or under
Frequency variation signal is it may happen that serious power fading, affects very big to communication quality.And, power fading is believed by before and after frequency conversion
Number frequency, fiber lengths, optical carrier wavelength affect.
Power fading can be solved the problems, such as using single-side belt Electro-optical Modulation technology, but current single-side belt Electro-optical Modulation skill
Art is generally required uses electric phase shifter or optical filter, realizes that difficulty is larger, and frequency tunability is poor.
The content of the invention
Technical problem in the presence of in order to solve background technology, the present invention proposes a kind of based on palarization multiplexing manipulator
Microwave signal converter plant.The device has three big features：One is that RF and LO signals adopt suppressed-carrier double side band modulation methods
Formula, improves the isolation of conversion gain and frequency variation signal to RF and LO；Two is can to compensate frequency variation signal by Polarization Control
Power fading after fiber-optic transfer；Three is that the device is extended to multichannel application, makes the signal after frequency conversion can be while passing through
The transmission of multiple different length optical fiber, and the power fading of each passage is while be compensated.
The present invention technical solution be：Described device includes that laser diode (LD), palarization multiplexing horse increase manipulator
(PDM-MZM), erbium-doped fiber amplifier (EDFA), 1 point of N roads optical branching device (1：N Spiltter), the polarizer (Pol), polarization
Controller (PC), standard single-mode fiber (SMF) and photoelectric detector (PD)；The input phase of the output port of LD and PDM-MZM
Even, RF signal loadings increase on manipulator (X-MZM) in the upper branch road horse of PDM-MZM, lower branch road of the LO signal loadings in PDM-MZM
Horse increases on manipulator (Y-MZM), and the outfan of manipulator is connected with EDFA, and EDFA output optical signals are divided into N through optical branching device
Road, in each branch road optical signal PC, Pol, SMF and PD are sequentially passed through, and wherein each branch road SMF length can be with difference.
Above-mentioned PDM-MZM is integrated by Y type beam splitters, parallel up and down X-MZM, Y-MZM, and polarization multiplexer (PBS).
Above-mentioned X-MZM and Y-MZM have identical structure and performance, are respectively provided with independent prevention at radio-frequency port and direct current biasing end
Mouthful.
Apparatus of the present invention are operationally comprised the following steps：
1) send continuous light carrier from LD and enter PDM-MZM, Y types shunt is divided into two equal light of power and carries light carrier
Ripple, respectively enters X-MZM and Y-MZM；
2) RF signals drive X-MZM, and controlling the direct current biasing of X-MZM makes it be operated in smallest point, and output carries the suppression of RF signals
Carrier wave double-side band optical signal processed；
3) LO signals drive Y-MZM, control the direct current biasing of Y-MZM make 1 its be operated in smallest point, output carries the suppression of LO signals
Carrier wave double-side band optical signal processed；
4) optical signal of X-MZM and Y-MZM outputs exports PDM-MZM Jing after PBS palarization multiplexings, amplifies through EDFA, Ran Houjing
Cross optical branching device and be divided into N roads；
5) PC is first passed around per road optical signal, then through Pol, modulating PC makes to enter the main shaft of two polarized light with Pol of Pol
Angle is 45 °, after SMF is transmitted, using PD the signal of telecommunication is detected；
6) can adjust PC to change the phase contrast (θ) of two polarized light according to operating frequency and fiber lengths per road, so as to get
Up-conversion or down-conversion signal power are maximum, that is, compensate for power fading.
The present invention proposes a kind of microwave signal photonic propulsion converter plant and method that can be used for multichannel optical fiber transmission, should
Device will carry out palarization multiplexing using PDM-MZM after RF and LO signal modulations, using PC to two before fiber-optic transfer is carried out
Polarized light introduces phase contrast, offsets the phase shift that fibre-optical dispersion is introduced to optical sideband, prevents the signal after frequency conversion from power fading occurring.
Because two sub- manipulators of PDM-MZM are operated in smallest point, RF and LO signals are bilateral using suppressed carrier
Band modulation technique, light carrier is inhibited, RF the and LO signals after photodetection are less, and the signal after frequency conversion accounts for the master of the signal of telecommunication
Lead, and then improve conversion gain, and isolation of the frequency variation signal to RF and LO.
In the device, optical signal can be divided into multichannel, and the fiber-optic transfer of different length, and the power fading per road are carried out per road
Can independently be compensated by Polarization Control, be independent of each other.The equipment that the program is adopted is simple, low cost, easy to adjust flexible, tool
There is passage expansion.
Description of the drawings
Fig. 1 is the schematic diagram of apparatus of the present invention；
Fig. 2 is that in the experiment test to apparatus of the present invention, when manipulator is operated in respectively orthogonal points and smallest point, the light of output is believed
Number frequency spectrum；
Fig. 3 is in the experiment test to apparatus of the present invention, when manipulator is operated in respectively orthogonal points and smallest point, without optical fiber
Transmission, the signal of telecommunication frequency spectrum obtained after PD；
Fig. 4 is that in the experiment test to apparatus of the present invention, under the fiber-optic transfer of different length, error is sweared before and after power fading compensation
The curve that discharge amplitude (EVM) changes with received optical power.
Specific embodiment
Embodiments of the invention are elaborated below in conjunction with the accompanying drawings：The present embodiment is with technical solution of the present invention as front
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：
As shown in figure 1, in the present embodiment, device includes：LD, RF signal source, LO signal sources, PDM-MZM (including Y type shunts,
X-MZM、Y-MZM、PBC)、EDFA、1：4 optical branching devices, PC, Pol, SMF, PD.LD is sequentially connected PDM-MZM, EDFA, after EDFA
Connect 1：4 optical branching devices.1：4 optical branching device outfans connect 4 structure identical optical fiber links, and i-th (i=1,2,3, it is 4) individual
Link is sequentially connected PCi, Poli and SMFi.SMFi output termination PDi, in PDi outfans frequency variation signal is obtained.
In this example, the specific implementation step of method is：
Step one：LD produces operation wavelength 1552.5nm, the continuous light carrier of luminous power 15dBm, and being input to half-wave voltage is
The PDM-MZM of 3.5V.The simple signal of RF signal source output frequency 5GHz, for driving X-MZM.LO signal source output frequencies
The simple signal of 33GHz, for driving Y-MZM.Optical signal after RF and LO modulation exports PDM- after PBC palarization multiplexings
MZM.Typically manipulator is operated in into orthogonal points, PDM- when X-MZM and Y-MZM is operated in orthogonal points in traditional Electro-optical Modulation
The optical signal spectrum of MZM outputs is as shown by the dash line in figure 2, it can be seen that have significant light carrier.In apparatus of the present invention by X-MZM and
Y-MZM is operated in smallest point, and optical signal spectrum such as Fig. 2 of PDM-MZM outputs is shown in solid, it can be seen that light carrier is obtained significantly
Suppress.
Step 2：It is 8dBm to arrange LO signal powers, and RF signal powers are 2dBm, and EDFA outputs are 8.5dBm.PD is responded
Spend for 0.6A/W.
Step 3：Without fiber-optic transfer, the optical signal of Pol outputs is directly entered PD.Adjusting the PC before Pol makes two polarized light
Phase difference θ=0, makes the 38GHz signals after PD after up-conversion reach maximum.Fig. 3 (b) is the signal of telecommunication frequency spectrum for finally giving, can
As -13.4dBm, conversion gain reaches -15.4dB to 38GHz signal powers after to see up-conversion.In addition, up-conversion signal is to LO
The isolation of signal is up to 31.6dB.In order to show that the present invention suppresses the performance advantage of light carrier, to the equal works of X-MZM and Y-MZM
Make the signal of telecommunication in orthogonal points and be also carried out test, shown in such as Fig. 3 (a).Now conversion gain only -43dB, and up-conversion
Isolation poor (- 23.7dB) of the signal to LO signals.By contrast as can be seen that manipulator is biased in into minimum according to the present invention
After point, conversion gain improves 27.6dB, and frequency variation signal improves 55.3dB to LO Signal segregation degrees.
Step 4：By in the 16QAM signal modulations of 100MSym/s to RF signals, then upconverted to by apparatus of the present invention
38GHz.The photomixing signal of PDM-MZM outputs is through 1：Carry out respectively after 4 optical branching devices length for 0km (non-fiber transmit,
BTB), the optical fiber of 4km, 25km and 50km.Per road respectively through PD is entered after PC and Pol, the microwave vector letter of 38GHz is obtained
Number.
Step 5：Change the luminous power into PD successively, test upconverts to the EVM of the vector signal of 38GHz per road, as a result such as
Shown in Fig. 4.For the ease of comparing, test first every road when θ=0 EVM with luminous power change curve, it can be seen that BTB
When EVM curves preferably, and after 4km, 25km and 50km fiber-optic transfer, there is more or less work(in the 38GHz signals after up-conversion
Rate declines, and then EVM curves are poor.Then the optical signal per road is controlled respectively through PC, the two of optical signal in Shi Mei roads
Individual polarized light phase contrast reaches optimal θOpt, now often the EVM curves on road are significantly improved, and basically reach and phase under BTB patterns
When performance.
To sum up, the present invention realizes the photonic propulsion frequency conversion of microwave signal using PDM-MZM, and realizes that multichannel optical fiber is transmitted.
By suppressing light carrier double sideband modulation, conversion efficiency is improve, improve isolation of the signal after frequency conversion to RF and LO, together
When after Polarization Control is to multichannel optical fiber transmission the power fading of frequency variation signal carried out effective compensation.The invention device
Can be preferable, and simple structure, polarization state can be controlled flexibly, and then have very strong operability in actual applications.
In a word, embodiments described above is only one embodiment of the present of invention, is not only used for limiting the present invention
Protection domain, it is noted that for those skilled in the art, in present disclosure, also
Some equivalent variations and replacement, luminous power, the carrier frequency of RF and LO signals, RF format modulation signals, port number, optical fiber can be made
Length, isoparametric adjustment also should be regarded as the scope of protection of the invention.
Claims (4)
1. the device and method that a kind of frequency conversion of achievable microwave signal photonic propulsion and multichannel optical fiber are transmitted, laser diode (LD)
Output light carrier enters electrooptic modulator, and by radio frequency (RF) and local oscillator (LO) signal modulation, optical signal is through standard single-mode fiber
(SMF) into photoelectric detector (PD) signal after frequency conversion is detected afterwards, it is characterised in that：The electrooptic modulator is multiple for polarization
Increase manipulator (PDM-MZM) with horse, radio frequency (RF) and local oscillator (LO) signal drive respectively two sub- manipulators of PDM-MZM,
Have Polarization Controller (PC) and the polarizer (Po1) after PDM-MZM successively, by adjust manipulator bias point with improve system every
From degree and conversion efficiency, the polarization state for adjusting optical signal by PC is declined with the power for compensating frequency variation signal after multichannel optical fiber is transmitted
Fall.
2. microwave signal photonic propulsion according to claim 1 frequency conversion and multichannel optical fiber transmitting device, it is characterised in that：
Two sub- manipulators of PDM-MZM manipulators are operated in smallest point, improve isolation of the converted signals to RF and LO, improve
Conversion efficiency.
3. microwave signal photonic propulsion according to claim 1 and 2 frequency conversion and multichannel optical fiber transmitting device, its feature exists
In：Adjusting PC can change the watt level of up-conversion or down-conversion signal after PD.
4. microwave signal photonic propulsion according to claim 3 frequency conversion and multichannel optical fiber transmitting device, it is characterised in that：Adjust
Optical signal after system can be divided into multiple passages by optical branching device, and each passage is transmitted through the SMF of identical or different length, solely
The vertical PC for adjusting each passage, can make the up-conversion after every passage PD or the power of down-conversion signal reach maximum, it is to avoid power
Decline.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107682087A (en) * | 2017-09-22 | 2018-02-09 | 西南交通大学 | A kind of steady phase transmission method of microwave optical fiber for eliminating local oscillator leakage in passive phase correction |
| CN107846254A (en) * | 2017-10-12 | 2018-03-27 | 北京工业大学 | The photonic methodologies and system of microwave down coversion and phase shift are realized using integrated device |
| CN107919914A (en) * | 2017-12-20 | 2018-04-17 | 西安电子科技大学 | Quadruple signal is generated based on double-parallel modulator and realizes the device and method of microwave photon phase shift |
| CN109150314A (en) * | 2018-10-25 | 2019-01-04 | 中国科学院电子学研究所 | Frequency conversion phase shift integration photon microwave mixer device |
| CN109714107A (en) * | 2019-03-07 | 2019-05-03 | 西安电子科技大学 | Microwave light dispersion compensation method based on PDM-DPMZM chain-circuit system |
| CN109842451A (en) * | 2017-11-25 | 2019-06-04 | 西安电子科技大学 | The method for realizing the frequency conversion of microwave signal photonics and multichannel phase shift using dual-polarization quadrature phase shift keyed modulators |
| CN109981181A (en) * | 2019-02-19 | 2019-07-05 | 西北工业大学 | Microwave photon converter plant and adjusting method can be switched in a kind of binary channels |
| CN110098873A (en) * | 2018-01-27 | 2019-08-06 | 西安电子科技大学 | A kind of device and method for realizing the linear optimization of multichannel analog optical link and power cycle fading compensation using light polarization modulator |
| CN110336611A (en) * | 2019-07-23 | 2019-10-15 | 中国科学院半导体研究所 | Image interference based on fiber dispersion effects inhibits frequency mixer |
| CN110429986A (en) * | 2019-07-03 | 2019-11-08 | 复旦大学 | A kind of generation of multichannel millimeter wave and wireless transmitting system based on single sideband modulation |
| CN110798268A (en) * | 2018-08-03 | 2020-02-14 | 西安电子科技大学 | Microwave signal optical fiber transmission method with high spectral efficiency and optimized power fading |
| CN113219828A (en) * | 2021-04-22 | 2021-08-06 | 中国电子科技集团公司第二十九研究所 | Control method for gain consistency of multi-channel analog optical module |
| CN113726444A (en) * | 2021-08-30 | 2021-11-30 | 中国电子科技集团公司第四十四研究所 | Array microwave signal optical domain down-conversion method and device |
| CN114024616A (en) * | 2021-10-22 | 2022-02-08 | 北京邮电大学 | Multi-path frequency conversion structure realized by polarization state independent modulation |
| CN114826391A (en) * | 2022-03-11 | 2022-07-29 | 中国电子科技集团公司第二十九研究所 | Method and device for controlling phase difference between channels of multi-channel radio frequency optical transmission product |
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| CN107682087B (en) * | 2017-09-22 | 2019-05-07 | 西南交通大学 | A kind of steady phase transmission method of microwave optical fiber for eliminating local oscillator leakage in passive phase correction |
| CN107682087A (en) * | 2017-09-22 | 2018-02-09 | 西南交通大学 | A kind of steady phase transmission method of microwave optical fiber for eliminating local oscillator leakage in passive phase correction |
| CN107846254A (en) * | 2017-10-12 | 2018-03-27 | 北京工业大学 | The photonic methodologies and system of microwave down coversion and phase shift are realized using integrated device |
| CN107846254B (en) * | 2017-10-12 | 2020-04-17 | 北京工业大学 | Photonic method and system for realizing microwave down-conversion and phase shift by utilizing integrated device |
| CN109842451A (en) * | 2017-11-25 | 2019-06-04 | 西安电子科技大学 | The method for realizing the frequency conversion of microwave signal photonics and multichannel phase shift using dual-polarization quadrature phase shift keyed modulators |
| 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 |
| CN107919914A (en) * | 2017-12-20 | 2018-04-17 | 西安电子科技大学 | Quadruple signal is generated based on double-parallel modulator and realizes the device and method of microwave photon phase shift |
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| CN110798268B (en) * | 2018-08-03 | 2022-04-22 | 西安电子科技大学 | Microwave signal optical fiber transmission method with high spectral efficiency and optimized power fading |
| CN109150314B (en) * | 2018-10-25 | 2020-06-09 | 中国科学院电子学研究所 | Frequency conversion phase shift integrated photon microwave frequency mixing device |
| CN109150314A (en) * | 2018-10-25 | 2019-01-04 | 中国科学院电子学研究所 | Frequency conversion phase shift integration photon microwave mixer device |
| CN109981181B (en) * | 2019-02-19 | 2021-07-09 | 西北工业大学 | Dual-channel switchable microwave photon frequency conversion device and adjusting method |
| CN109981181A (en) * | 2019-02-19 | 2019-07-05 | 西北工业大学 | Microwave photon converter plant and adjusting method can be switched in a kind of binary channels |
| CN109714107A (en) * | 2019-03-07 | 2019-05-03 | 西安电子科技大学 | Microwave light dispersion compensation method based on PDM-DPMZM chain-circuit system |
| CN110429986B (en) * | 2019-07-03 | 2022-03-18 | 复旦大学 | Multichannel millimeter wave generation and wireless transmission system based on single-side band modulation |
| CN110429986A (en) * | 2019-07-03 | 2019-11-08 | 复旦大学 | A kind of generation of multichannel millimeter wave and wireless transmitting system based on single sideband modulation |
| CN110336611B (en) * | 2019-07-23 | 2021-01-29 | 中国科学院半导体研究所 | Image interference rejection mixer based on optical fiber dispersion effect |
| CN110336611A (en) * | 2019-07-23 | 2019-10-15 | 中国科学院半导体研究所 | Image interference based on fiber dispersion effects inhibits frequency mixer |
| CN113219828A (en) * | 2021-04-22 | 2021-08-06 | 中国电子科技集团公司第二十九研究所 | Control method for gain consistency of multi-channel analog optical module |
| CN113219828B (en) * | 2021-04-22 | 2022-07-05 | 中国电子科技集团公司第二十九研究所 | Control method for gain consistency of multi-channel analog optical module |
| CN113726444A (en) * | 2021-08-30 | 2021-11-30 | 中国电子科技集团公司第四十四研究所 | Array microwave signal optical domain down-conversion method and device |
| CN114024616A (en) * | 2021-10-22 | 2022-02-08 | 北京邮电大学 | Multi-path frequency conversion structure realized by polarization state independent modulation |
| CN114826391A (en) * | 2022-03-11 | 2022-07-29 | 中国电子科技集团公司第二十九研究所 | Method and device for controlling phase difference between channels of multi-channel radio frequency optical transmission product |
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