CN106411408B - A kind of device generating millimeter wave based on PDM-DPMZM modulator - Google Patents
A kind of device generating millimeter wave based on PDM-DPMZM modulator Download PDFInfo
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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
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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
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Abstract
The invention discloses a kind of devices that millimeter wave is generated based on PDM-DPMZM modulator, are provided with PDM-DPMZM modulator, the DPMZM1 including top set, the DPMZM2 of inferior division；DPMZM1 includes MZM1-a and MZM1-b；DPMZM2 includes MZM2-a and MZM2-b.The present invention utilizes the nonlinear characteristic and palarization multiplexing characteristic of PDM-DPMZM modulator, and generating frequency is the octuple optical millimeter wave signal of local oscillation signal frequency, reduces the frequency of RF local oscillator signal and the response frequency requirement of modulator, thereby reduces system cost.The present invention does not need specific modulation index, flexible modulation radiofrequency signal, reduce the requirement to radio-frequency power, it is cancelled out each other unwanted frequency using palarization multiplexing, purer octonary and higher radio frequency spur suppression ratio are obtained, radio frequency spur suppression ratio can achieve 58dB or more in scheme, when modulation index is between 3.35~4.71, obtained octonary radio frequency spur suppression ratio is kept approximately constant, and solves the problems, such as the amplitude shift of radio-frequency signal source.The present invention does not need direct current biasing, solves the problems, such as dc shift.
Description
Technical field
The invention belongs to the communication technologys and microwave technical field, more particularly to a kind of PDM-DPMZM modulator that is based on to generate
The device of millimeter wave.
Background technique
Currently, when human society being advanced to information with the information technology achievement that computer and communication network are mark
Generation.In recent years, Internet service diversification of forms and portfolio rapid development, people are to including sound, data, image and video display
The demand of equal multimedia communications is higher and higher, more more and more urgent, requires in terms of the bandwidth and mobility to network also higher and higher.
High bandwidth, low-loss, low cost, Fibre Optical Communication Technology easy to maintain are increasingly becoming the first choice of high-speed broadband network, it is high flexibly
Property, high mobility wireless communication technique make it possible communication at any time, any place.Therefore broadband optical fiber
Communication is mutually merged with the wireless communication of high mobility, will be the developing direction of future wireless.In this background,
Large capacity, high bandwidth, low-loss, electromagnetism interference, fiber optic communication network easy to maintain become very attractive solution height
The scheme of fast broadband access network, on the other hand, high flexibility, high mobility wireless communication technique to communicate it is in office when
It waits, any place is possibly realized.Therefore the wireless communication of broadband fiber optic communication and high mobility is combined, i.e. light carries radio frequency
(ROF) system of communication, will be the developing direction of future wireless.Currently, due to GSM, CDMA, Wi-Fi, satellite communication
Etc. common wireless access technology service band all integrated distributions at 800MHz, 2GHz, 2.5GHz and 6GHz, lead to 10GHz
Following frequency range frequency spectrum resource is very limited, this has become the bottleneck of mobile communication future development, wirelessly connects along with existing
The message transmission rate highest for entering technology also only has 20Mbps or so, the demand of high-speed link access is unable to reach, so wirelessly
Communication system can only select higher frequency range to be communicated.It is closed very much however, the generation of ROF system medium-high frequency millimeter wave is one
The problem of key, traditional electrical domain method are difficult even almost to be unable to complete the generation of extremely complex extremely high frequency millimeter-wave signal,
It is primarily due to generally use crystal oscillator to generate high frequency millimeter wave signal by frequency multiplication locking phase in electrical domain, due to electronic device
Rate limit and technique limitation be difficult generate high-frequency, high quality signal.In addition, generating high frequency using electrical domain method
Millimeter-wave signal has very high requirement to device, and complicated processing technology thereof may will be greatly reduced the performance of device.It is existing
Some millimeter waves, which generate scheme, light heterodyne method, and transferring preparation method based on nonlinear effect four-wave mixing effect method and is excited in cloth
Deep scattering method.In all these research methods, the external modulation scheme based on lithium niobate MZ Mach-Zehnder is usually recognized
To be the most reliable and effective method.Because of microwave devices such as the local vibration source used in external modulation frequency-doubling method and modulators
The frequency response of part all substantially reduces, and two light waves of progress beat frequency are all from same laser source tool in photodetector
There is extraordinary phase coherence.Therefore, external modulation technology becomes the one preferred technique for generating millimeter-wave signal.
Summary of the invention
The purpose of the present invention is to provide a kind of devices that millimeter wave is generated based on PDM-DPMZM modulator, it is intended to solve
Device frequency index required for generating high frequency/extremely high frequency signal is reduced, system cost is thereby reduced and generates octonary
Radio-frequency signal source amplitude shift and the problem of dc shift in the process.
The invention is realized in this way a kind of PDM-DPMZM modulator, the PDM-DPMZM modulator is provided with point
The DPMZM1, the DPMZM2 of inferior division of branch；
The DPMZM1 includes MZM1-a and MZM1-b；
The DPMZM2 includes MZM2-a and MZM2-b；
The MZM1-a of top set double parallel Mach-Zehnder modulators DPMZM1, top set's double parallel Mach-Zehnder tune
The MZM1-b of device DPMZM1 processed, the MZM2-a of inferior division double parallel Mach-Zehnder modulators DPMZM2, inferior division double parallel horse
The MZM2-b of conspicuous-Zeng Deer modulator DPMZM2.
Another object of the present invention is to provide a kind of dresses of generation millimeter wave using the PDM-DPMZM modulator
It sets, the device for generating millimeter wave is provided with light source, radio-frequency signal source, Polarization Controller, PDM-DPMZM modulator, electricity point
Road device, the first phase shifter, the second phase shifter, third phase shifter, photodetector；
The output port of light source is incident on PDM-DPMZM modulator after Polarization Controller rotates 45 degree, and light wave passes through
It is divided into mutually perpendicular x, y two-way after PBS, the road x light wave is incident on the DPMZM1 of top set, and the road y light wave is incident on inferior division
DPMZM2；
Radio-frequency signal source is divided into identical four tunnel of power by electric shunt, and the first via drives double parallel Mach-Zehnder
The MZM1-a of modulator DPMZM1, the second tunnel drive double parallel Mach-Zehnder modulators after the first phase shifter phase shift
The MZM1-b of DPMZM1；Third road drives double parallel Mach-Zehnder modulators DPMZM2's after the second phase shifter phase shift
MZM2-a, the 4th tunnel drive the MZM2-b of double parallel Mach-Zehnder modulators DPMZM2 after third phase shifter phase shift；
After PBC is coupled, optical signal is incident on photodetector for the output of DPMZM1 and DPMZM2, defeated after photodetector beat frequency
Octonary out.
Another object of the present invention is to provide a kind of method of the generation millimeter wave of device for generating millimeter wave, institutes
State generate millimeter wave method the following steps are included:
Step 1: tunable light source generates the continuous light wave that operation wavelength λ is 1552.5nm, continuous light wave is revolved by the polarizer
PDM-DPMZM modulator is incident on after turning π/4；The local oscillation signal of radio-frequency signal source output 10GHz is divided into function after electric shunt
Four equal tunnels of rate, the first via is for driving MZM1-b after driving MZM1-a, the second tunnel to pass through the first phase shifter phase shift pi/2；The
Three tunnels drive MZM2-a after passing through the second phase shifter phase shift π/4, and the 4th tunnel is by driving MZM2- behind third phase shifter phase shift-π/4
b；
Step 2: two sub- modulator MZM1-a and MZM1-b of DPMZM1 are biased in maximum transmitted point, MAIN MUX
Also it is biased in maximum transmitted point；The sub- modulator MZM2-a and MZM2-b of two of DPMZM2 is biased in maximum transmitted point, homophony
Device processed is also biased in maximum transmitted point, and when modulation index is between 3.35~4.71, the output of DPMZM1 mainly includes that light carries
Wave, positive and negative quadravalence and positive and negative eight ranks sideband；Light of the output of DPMZM2 mainly comprising the output vertical light with DPMZM1 carries
Wave, positive and negative quadravalence and positive and negative eight ranks sideband；
Step 3: the output light wave of DPMZM1 and DPMZM2 exports the light carrier that light wave is palarization multiplexing after PBC is coupled,
Positive and negative quadravalence and positive and negative eight ranks sideband, after optical signal is incident on photodetector, export octonary after beat frequency；
If Ein(t)=E0exp(jωct)
The output of DPMZM1 are as follows:
The output of DPMZM2 are as follows:
Wherein, m=π VRF/ V π, E0, ωcFor the amplitude and angular frequency of light wave, vRF、ωmFor radio-frequency signal source amplitude and
Angular frequency, VπFor the half-wave voltage of PDM-DPMZM modulator.
The output light wave of DPMZM1 and DPMZM2 can indicate after PBC is coupled are as follows:
Optical signal after PBC is coupled can indicate after PD beat frequency are as follows:
By Bessel function, we are available:
It will be available after (5) formula substitution (4) formula abbreviation:
(6) formula shows that output is octonary signal.As seen from Figure 2 when modulation index is when for 3.35, generation
The radio frequency spur suppression ratio of millimeter-wave signal can reach 58dB；As seen from Figure 3 when modulation index is 3.98, the milli of generation
The radio frequency spur suppression ratio of metric wave signal can reach 59dB.As seen from Figure 4 when modulation index is between 3.35~4.71,
Radio frequency spur suppression ratio is kept approximately constant.
Another object of the present invention is to provide a kind of 80GHz millimeter wave generations using the PDM-DPMZM modulator
Device.
Another object of the present invention is to provide a kind of 120GHz millimeter wave generations using the PDM-DPMZM modulator
Device.
The device provided by the invention that millimeter wave is generated based on PDM-DPMZM modulator, utilizes PDM-DPMZM modulator
Nonlinear characteristic and palarization multiplexing characteristic, producing frequency is the octuple optical millimeter wave signal of local oscillation signal frequency, is substantially reduced
The frequency of RF local oscillator signal and the response frequency requirement of modulator, thereby reduce system cost；The present invention only needs one
A frequency is the RF local oscillator signal of 10GHz, so that it may generate the millimeter-wave signal of 80GHz.The present invention does not need specifically to adjust
Index processed can be reduced the requirement to radio-frequency power, be cancelled out each other and do not needed using palarization multiplexing with flexible modulation radiofrequency signal
Frequency, purer octonary and higher radio frequency spur suppression ratio, radio frequency spurious reduction in this programme can be obtained
Than can achieve 58dB or more, when modulation index is between 3.35~4.71, obtained octonary radio frequency spur suppression ratio
It is kept approximately constant, thus the very good solution amplitude shift problem of radio-frequency signal source.The present invention does not need direct current biasing, very
Good solves the problems, such as dc shift.The structure is not needed using any filter simultaneously, therefore can be applied to wdm system
In.By emulation, the millimeter-wave signal that 80GHz is generated by the RF local oscillator signal of 10GHz, the millimeter-wave signal of acquisition are realized
Radio frequency spur suppression ratio it is very high.When modulation index is between 3.35~4.71, the millimeter radio frequency spur suppression ratio of generation can
Reach 58dB or more.
Detailed description of the invention
Fig. 1 is the schematic device provided in an embodiment of the present invention that millimeter wave is generated based on PDM-DPMZM modulator；
In figure: 1, light source；2, radio-frequency signal source；3, Polarization Controller；4, PDM-DPMZM modulator；5, electric shunt；6,
First phase shifter；7, the second phase shifter；8, third phase shifter；9, photodetector.
Fig. 2 is present example offer when modulation index is 3.35, and optical millimeter wave signal passes through high speed in the present invention
After photodetector, the frequent spectrogram of 80G local oscillation signal that beat frequency obtains.
Fig. 3 is present example offer when modulation index is 3.98, and optical millimeter wave signal passes through high speed in the present invention
After photodetector, the frequent spectrogram of 80G local oscillation signal that beat frequency obtains.
Fig. 4 is situation of change of the radio frequency spur suppression ratio (RFSSR) with modulation index m.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that specific example described herein is only used to explain the present invention, it is not used to limit
The fixed present invention.
Application principle of the invention is explained in detail with reference to the accompanying drawing.
As shown in Figure 1, the device based on PDM-DPMZM modulator generation millimeter wave that present example provides includes: light
Source 1, radio-frequency signal source 2, Polarization Controller 3, PDM-DPMZM modulator 4, electric shunt 5, the first phase shifter 6, the second phase shifter
7, third phase shifter 8, photodetector 9.
The output port of light source 1 rotates after angle is 45 degree by Polarization Controller 3 is incident on PDM-DPMZM modulator 4.
Light wave is divided into mutually perpendicular x, y two-way after passing through PBS, and the road x light wave is incident on the DPMZM1 of top set, and the road y light wave is incident on
The DPMZM2 of inferior division.Radio-frequency signal source 2 is divided into identical four tunnel of power by electric shunt 5, and the first via drives top set double
The MZM1-a of parallel Mach-Zehnder modulators DPMZM1, the second tunnel drives top set's double flat after 6 phase shift of the first phase shifter
The MZM1-b of row Mach-Zehnder modulators DPMZM1, third road drive double parallel Mach-after 7 phase shift of the second phase shifter
The MZM2-a of Zeng Deer modulator DPMZM2, third road drive double parallel Mach-Zehnder tune after 8 phase shift of third phase shifter
The MZM2-b of device DPMZM2 processed.Two sub- MZM of DPMZM1 and DPMZM2 are biased in maximum transmitted point, and MAIN MUX also biases
In maximum transmitted point.When modulation index is between 3.35~4.71, the output of DPMZM1 mainly includes light carrier, positive and negative quadravalence
And positive and negative eight ranks sideband；Light carrier of the output of DPMZM2 mainly comprising the output vertical light with DPMZM1, positive and negative quadravalence
And positive and negative eight ranks sideband；The output of DPMZM1 and DPMZM2 exports the light carrier that light wave is palarization multiplexing after PBC is coupled, just
Negative quadravalence and positive and negative eight ranks sideband, after optical signal is incident on photodetector, obtain octonary by beat frequency；Work as modulation index
When between 3.35~4.71, obtained octonary radio frequency spur suppression ratio is kept approximately constant, thus very good solution
The amplitude shift problem of radio-frequency signal source.
Present example provide based on PDM-DPMZM modulator generate millimeter wave method the following steps are included:
Step 1: tunable light source generates the continuous light wave that operation wavelength λ is 1552.5nm, continuous light wave is revolved by the polarizer
It is input to dual-polarization DPMZM modulator after turning π/4, the local oscillation signal of radio-frequency signal source output 10GHz is divided into after electric shunt
Four equal tunnels of power, the first via is for driving MZM1-b after driving MZM1-a, the second tunnel to pass through the first phase shifter phase shift pi/2；
Third road drives MZM2-a after passing through the second phase shifter phase shift π/4, and the 4th tunnel behind third phase shifter phase shift-π/4 by driving
MZM2-b。
Step 2: two sub- modulator MZM1-a and MZM1-b of DPMZM1 are biased in maximum transmitted point, MAIN MUX
Also it is biased in maximum transmitted point；The sub- modulator MZM2-a and MZM2-b of two of DPMZM2 is biased in maximum transmitted point, homophony
Device processed is also biased in maximum transmitted point, and when modulation index is between 3.35~4.71, the output of DPMZM1 mainly includes that light carries
Wave, positive and negative quadravalence and positive and negative eight ranks sideband；Light of the output of DPMZM2 mainly comprising the output vertical light with DPMZM1 carries
Wave, positive and negative quadravalence and positive and negative eight ranks sideband；
Step 3: the output of DPMZM1 and DPMZM2 exports the light carrier that light wave is palarization multiplexing after PBC is coupled, it is positive and negative
Quadravalence and positive and negative eight ranks sideband after optical signal is incident on photodetector, obtains the millimeter wave that frequency is 80GHz through beat frequency and believe
Number.
If Ein(t)=E0exp(jωct)
DPMZM1's is defeated are as follows:
The output of DPMZM2 are as follows:
Wherein, m=π VRF/Vπ, E0, ωcFor the amplitude and angular frequency of light wave, vRF、ωmAmplitude and angle for radio-frequency signal source
Frequency, VπFor the half-wave voltage of PDM-DPMZM modulator.
The output light wave of DPMZM1 and DPMZM2 can indicate after PBC is coupled are as follows:
Optical signal after PBC is coupled can indicate after PD beat frequency are as follows:
By Bessel function, we are available:
It will be available after (5) formula substitution (4) formula abbreviation:
(6) formula display output is octonary signal.As seen from Figure 2 when modulation index position 3.35, the millimeter of generation
The radio frequency spur suppression ratio of wave signal can reach 58dB；As seen from Figure 3 when modulation index is 3.98, the millimeter wave of generation
The radio frequency spur suppression ratio of signal can reach 59dB.As seen from Figure 4 when modulation index is between 3.35~4.71, radio frequency
Spur suppression ratio (RFSSR) is kept approximately constant.The present invention is due to being utilized PDM-DPMZM modulator nonlinear characteristic and polarization
Multiplexing characteristics realize the generation of millimeter wave octonary signal, reduce in millimeter-wave systems to electrooptic modulator and radio frequency sheet
The frequency requirement of vibration, and the millimeter-wave signal frequency degree of purity generated is high.The invention is so that high frequency, extremely high frequency millimeter-wave signal
There is more actual operability.In present disclosure, several equivalent variations and replacement, millimeter can also be made
The frequency range of wave is not limited to 80GHz, if the system can produce the millimeter wave of 120GHz using the RF local oscillator of 15GHz
Signal, these equivalent variations and replacement and the adjustment of frequency range also should be regarded as the scope of protection of the invention.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (3)
1. a kind of PDM-DPMZM modulator, which is characterized in that the PDM-DPMZM modulator is provided with the DPMZM1 of top set,
The DPMZM2 of inferior division；
The DPMZM1 includes MZM1-a and MZM1-b；
The DPMZM2 includes MZM2-a and MZM2-b；
The MZM1-a of top set double parallel Mach-Zehnder modulators DPMZM1, top set's double parallel Mach-Zehnder modulators
The MZM1-b of DPMZM1, the MZM2-a of inferior division double parallel Mach-Zehnder modulators DPMZM2, inferior division double parallel Mach-
The MZM2-b of Zeng Deer modulator DPMZM2；
The device of the generation millimeter wave of the PDM-DPMZM modulator be provided with light source, radio-frequency signal source, Polarization Controller,
PDM-DPMZM modulator, electric shunt, the first phase shifter, the second phase shifter, third phase shifter, photodetector；
The output port of light source is incident on PDM-DPMZM modulator after Polarization Controller rotates 45 degree, after light wave passes through PBS
It is divided into mutually perpendicular x, y two-way, the road x light wave is incident on the DPMZM1 of top set, and the road y light wave is incident on inferior division
DPMZM2；
Radio-frequency signal source is divided into identical four tunnel of power by electric shunt, and the first via drives the modulation of double parallel Mach-Zehnder
The MZM1-a of device DPMZM1, the second tunnel drive double parallel Mach-Zehnder modulators DPMZM1 after the first phase shifter phase shift
MZM1-b；Third road drives the MZM2-a of double parallel Mach-Zehnder modulators DPMZM2 after the second phase shifter phase shift,
Third road drives the MZM2-b of double parallel Mach-Zehnder modulators DPMZM2 after third phase shifter phase shift；DPMZM1 and
The output of DPMZM2 exports 8 frequencys multiplication after PBC is coupled after PD beat frequency；
It is described generate millimeter wave device generation millimeter wave method the following steps are included:
Step 1: tunable light source generates the continuous light wave that operation wavelength λ is 1552.5nm, continuous light wave is revolved by Polarization Controller
The PDM-DPMZM modulator that half-wave voltage is 3V is input to after turning π/4；Radio-frequency signal source exports the local oscillation signal of 10GHz through electricity
It is divided into four equal tunnels of power after splitter, after the first via is for driving MZM1-a, the second tunnel to pass through the first phase shifter phase shift pi/2
Drive MZM1-b；Third road drives MZM2-a after passing through the second phase shifter phase shift π/4, and the 4th tunnel passes through third phase shifter phase shift-
MZM2-b is driven behind π/4；
Step 2: two sub- MZM1-a and MZM1-b of DPMZM1 are biased in maximum transmitted point, MAIN MUX is also biased in most
Big transfer point；Two sub- MZM2-a and MZM2-b of DPMZM2 are biased in maximum transmitted point, and MAIN MUX is also biased in maximum
Transfer point, when modulation index is 3.35 to 4.5, the output of DPMZM1 includes light carrier, positive and negative quadravalence and positive and negative eight rank side
Band；Light carrier of the output of DPMZM2 comprising the output vertical light with DPMZM1, positive and negative quadravalence and positive and negative eight ranks sideband；
Step 3: the output of DPMZM1 and DPMZM2 exports the light carrier that light wave is palarization multiplexing, positive and negative quadravalence after PBC is coupled
And positive and negative eight ranks sideband, octonary is obtained after PD beat frequency.
2. a kind of 80GHz millimeter wave generating device using PDM-DPMZM modulator described in claim 1.
3. a kind of 120GHz millimeter wave generating device using PDM-DPMZM modulator described in claim 1.
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