CN110445542A - The 20 times frequency optical millimeter waves device and method based on nested Mach-Zehnder modulators - Google Patents
The 20 times frequency optical millimeter waves device and method based on nested Mach-Zehnder modulators Download PDFInfo
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- CN110445542A CN110445542A CN201910652800.4A CN201910652800A CN110445542A CN 110445542 A CN110445542 A CN 110445542A CN 201910652800 A CN201910652800 A CN 201910652800A CN 110445542 A CN110445542 A CN 110445542A
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Abstract
The invention discloses a kind of device and method of 20 times frequency optical millimeter waves based on nested Mach-Zehnder modulators, the light wave that laser issues is by nested modulator by rf-signal modulation, nested modulator upper and lower arms are made of two cascade MZM modulators respectively, the phase difference for cascading the RF driving signal between MZM modulator is all pi/2, and the phase difference of every sub- modulator is all π；Two-arm difference output signal generates 4k+2 rank sideband to nested modulator up and down, and modulation index makes amplitude proportional in 2 rank sidebands zero of 2 rank Bessel functions, and upper and lower two paths of signals, which is added, generates (± 6, ± 10 ...) rank sideband；The RF driving signal phase difference that nested modulator or more two-arm is arranged is π/6, makes 6 rank sidebands of output because opposite in phase adds up to zero, exports 10 rank sidebands, generates 20 frequency doubling millimetre wave signals in photodetector beat frequency.The present invention can produce 20 times frequency optical millimeter waves without optical filter.
Description
Technical field
The present invention relates to Photoelectric Signal Processing method more particularly to it is a kind of generate 20 times frequency optical millimeter waves method and
Its device.
Background technique
With the fast development of information-intensive society, user proposes higher want to the bandwidth and rate of wireless communication access
It asks.Millimetre-wave attenuator becomes the contenders of broadband wireless communications because of its high bandwidth and high-speed.60GHz and frequencies above wave
Section will become the preferred frequency range of WLAN.Optical fiber radio communication RoF technology combine fiber optic communication high band is roomy and nothing
The advantages that line communication access is flexible can improve the transmission range of millimetre-wave attenuator.However, being limited to lithium niobate Mach-Zehnder
Millimeter-wave signal, is directly modulated in optical frequency and has difficulties, while high-frequency radio frequency device by modulator (MZM) lower frequency response
The higher cost of part, these require to generate high frequency light load millimeter wave using multiple frequence technology.Therefore how high quality is generated
Multiple frequence light, which carries millimeter wave, just becomes the breach of problem.
Scheme phase is generated with multiple frequences millimeter-wave signals such as quadruple, six frequencys multiplication, octonary, ten frequencys multiplication or twelvefold frequencies
Than 20 frequency multiplication schemes can produce the millimeter-wave signal of higher frequency or further decrease the needs to modulator bandwidth.
The method that generation multiple frequence light through reporting carries millimeter wave have integrated modulator method generate octonary [Acta Optica, 2014,4
(3): 0306004-1-8], modulator+stimulated Brillouin scattering method generate ten frequencys multiplication [optoelectronic laser, 2015,35 (4):
695-699], cascaded modulator+fibre grating method generate twelvefold frequency [Optics&Laser Technology, 2011,43
(7):1167-1171]。
However, the method that above-mentioned generation multiple frequence light carries millimeter wave comes with some shortcomings.Octonary integrated modulator method energy
The millimeter-wave frequency of generation is limited.Ten frequencys multiplication and twelvefold frequency method use stimulated Brillouin scattering effect or fiber grating, essence
On require to inhibit unwanted optical sideband using the filter function of additional optical device, but so again these methods can be interfered to exist
Application in wave division multiplexing WDM-RoF system and up-converter system also increases the complexity of system and limits it whole
The tunability of a millimere-wave band.
Summary of the invention
1, goal of the invention.
The present invention provides a kind of method and apparatus that can generate 20 times frequency optical millimeter waves without optical filter.
2, the technical solution adopted in the present invention.
The invention discloses a kind of 20 times frequency optical millimeter waves devices based on nested Mach-Zehnder modulators, packet
Include laser, radio-frequency signal generator, nested modulator, phase shifter, photodetector；
The light wave that laser issues by nested modulator by rf-signal modulation, distinguish by the two-arm up and down of nested modulator
It is made of two cascade MZM modulators, this four sub- modulators are all biased in minimum output point；Two above and below nested modulator
The phase difference that arm cascades the RF driving signal between MZM modulator is all pi/2, every sub- modulator two-arm RF driving signal
Between phase difference be all π, realized by phase shifter；The two paths of signals up and down that the upper and lower arms of nested modulator export respectively is all
4k+2 (k=0, ± 1, ± 2 ...) rank sideband can be generated, by the way that modulation index m is arranged, makes amplitude proportional in 2 rank Bessel functions2 rank sidebands be zero, then up and down two paths of signals be added generate (± 6, ± 10 ...) rank sideband；Nested modulator is set
Phase difference between the RF driving signal of upper and lower two-arm is π/6, makes 6 rank sidebands of output because opposite in phase adds up to zero, then
Output is mainly 10 rank sidebands, and other 4k+2 rank sideband amplitude very littles for being higher than 10 ranks are negligible；After optical fiber transmits just
10 rank sidebands and minus 10 rank sideband are in photoelectric detector PD beat frequency 20 frequency doubling millimetre wave signals of generation.
Further, nested modulator is parallel cascade Mach-Zehnder modulators.
Further, the modulation index by setting, even ifThat is m=5.953.
The invention discloses a kind of 20 times frequency optical millimeter waves generation sides based on nested Mach-Zehnder modulators
Method, the light wave that laser issues is by nested modulator by rf-signal modulation, and the two-arm up and down of nested modulator is respectively by two
A cascade MZM modulator is constituted, this four MZM modulators are all biased in minimum output point；Two above and below nested modulator
The phase difference that arm cascades the RF driving signal between MZM modulator is all pi/2, every sub- modulator two-arm RF driving signal
Between phase difference be all π, realized by phase shifter；The addition of two paths of signals up and down of the output of two-arm up and down of nested modulator can give birth to
At 4k+2 (k=0, ± 1, ± 2 ...) rank sideband, main includes ± 2, ± 6 and ± 10 rank sidebands, and other 4k+2 for being higher than 10 ranks
Order component amplitude very little is negligible；
The amplitude proportional of 2 rank sidebands is in 2 rank Bessel functionsM is modulation index, by the way that suitable adjust is arranged
Index processed, makesThe phase difference being arranged between the RF driving signal of nested modulator or more two-arm is π/6, is made
The 6 rank side band phases that 6 rank sidebands and the lower arm of arm output export when the two is added on the contrary, offseting each other and being zero；When 2 rank sidebands
It is zero and the 6 rank sidebands addition of two paths of signals is when offseting each other up and down, positive 10 rank sideband and minus 10 rank after optical fiber transmits
Sideband generates 20 frequency doubling millimetre wave signals in photoelectric detector PD beat frequency.
Further, light wave is inputtedBy nested modulator by frequency be ωmRf-signal modulation, nesting adjust
The two paths of signals up and down of device two-arm output processed can respectively indicate are as follows:
In formula, m=π Vm/VπIt is the modulation index of MZM modulator, VmIt is the amplitude of radiofrequency signal, VπIt is MZM modulation
The half-wave voltage of device,It is the phase difference above and below nested modulator between two-arm RF driving signal；
Upper and lower two paths of signals is added the output that can obtain nested modulator are as follows:
Output is 4k+2 (k=0, ± 1, ± 2 ...) rank sideband, and adjusting modulation index m makes2 rank sides can be eliminated
Band, wherein m=5.953, because of the phase difference above and below nested modulator between two-arm RF driving signalAnd make
Upper and lower 6 rank side band phase of two-way adds up to zero (1+e on the contraryj(4k+2)π/6=0,4k+2=± 6), and other 4k+2 for being higher than 10 ranks
Order component amplitude very little is negligible, therefore the output of nested modulator can simplify are as follows:
Output frequency is 10 ω respectivelymWith -10 ωm± 10 rank sidebands, due to photoelectric detector PD using square-law visit
It surveys, positive 10 rank sideband and minus 10 rank side can beat frequency 20 frequency doubling millimetre wave signals of generation.
3, technical effect caused by the present invention.
(1) light that the present invention can generate 20 frequencys multiplication carries millimeter wave, can reduce to radio-frequency devices and modulator bandwidth
It is required that can produce the millimeter wave of 100GHz if only needing the modulator of radio-frequency signal generator and the bandwidth of 5GHz for 5GHz.
(2) present invention can also generate high-quality light without optical filter and carry millimeter wave, and optical sideband inhibits than OSSR and penetrates
Frequency sideband inhibits than being respectively 33dB and 28dB, entire millimere-wave band that there is tunability and system to stablize is easy to accomplish,
It also can apply to WDM-RoF wavelength-division multiplex optical fiber wireless communication system and up-converter system.
Detailed description of the invention
Fig. 1 is the principle of the present invention structure chart.
Specific embodiment
Embodiment
A kind of method generating 20 times frequency optical millimeter waves proposed by the present invention, including laser 1, radiofrequency signal occur
Device 2, phase shifter 3, nested modulator 4, photodetector 5.Letter can be measured using spectroanalysis instrument and spectrum analyzer respectively
Number optical sideband inhibit than and radio frequency sideband inhibit than to test caused by 20 times frequency optical millimeter waves performance.
The specific method and steps are as follows that 20 times frequency optical millimeter waves generate:
The light wave that laser diode LD issues by nested modulator by rf-signal modulation, up and down the two of nested modulator
Arm is made of two cascade MZM modulators respectively, this four sub- modulators are all biased in minimum output point；Nested modulator
The phase difference of RF driving signal between upper and lower two-arm cascade MZM modulator is all pi/2, and every sub- modulator two-arm radio frequency drives
Phase difference between dynamic signal is all π, and the phase difference above and below nested modulator between two-arm RF driving signal is π/6, by moving
Phase device is realized；
The nested modulator two paths of signals up and down that two-arm exports respectively up and down can all generate 4k+2 (k=0, ± 1, ± 2 ...)
Rank sideband makes amplitude proportional in 2 rank Bessel functions by the way that suitable modulation index m is arranged2 rank sidebands be zero,
Then two paths of signals is added and generates (± 6, ± 10 ...) rank sideband up and down；Be arranged nested modulator up and down two-arm RF driving signal it
Between phase difference be π/6, the 6 rank side band phases that 6 rank sidebands and the lower arm for exporting upper arm export are on the contrary, mutual when the two is added
It offsets and is zero；Output at this time is mainly 10 rank sidebands, and other 4k+2 rank sideband amplitude very littles for being higher than 10 ranks are negligible, produce
The optical sideband that raw light carries millimeter wave inhibits than being 33dB.Positive 10 rank sideband and minus 10 rank sideband are in photoelectricity after optical fiber transmits
Detector PD beat frequency generates 20 frequency doubling millimetre wave signals, and the radio frequency sideband of the millimeter-wave signal inhibits than being 28dB.
Principle:
Input light waveBy nested modulator by frequency be ωmRf-signal modulation, nested modulator two-arm is defeated
Two paths of signals up and down out can respectively indicate are as follows:
In formula, m=π Vm/VπIt is the modulation index of MZM modulator, VmIt is the amplitude of radiofrequency signal, VπIt is MZM modulation
The half-wave voltage of device,It is the phase difference above and below nested modulator between two-arm RF driving signal；
Upper and lower two paths of signals is added the output that can obtain nested modulator are as follows:
Output is 4k+2 (k=0, ± 1, ± 2 ...) rank sideband, and adjusting modulation index m makes2 ranks can be eliminated
Sideband, wherein m=5.953, because of the phase difference above and below nested modulator between two-arm RF driving signalAnd make
Upper and lower 6 rank side band phase of two-way adds up to zero (1+e on the contraryj(4k+2)π/6=0,4k+2=± 6), and other 4k+2 for being higher than 10 ranks
Order component amplitude very little is negligible, therefore the output of nested modulator can simplify are as follows:
Output frequency is 10 ω respectivelymWith -10 ωm± 10 rank sidebands, due to photoelectric detector PD using square-law visit
It surveys, positive 10 rank sideband and minus 10 rank side can beat frequency 20 frequency doubling millimetre wave signals of generation.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (5)
1. a kind of 20 times frequency optical millimeter waves devices based on nested Mach-Zehnder modulators, it is characterised in that: including swashing
Light device, radio-frequency signal generator, nested modulator, phase shifter, photodetector；
The light wave that laser issues is by nested modulator by rf-signal modulation, and the two-arm up and down of nested modulator is respectively by two
A cascade MZM modulator is constituted, this four sub- modulators are all biased in minimum output point；Two-arm grade above and below nested modulator
The phase difference of RF driving signal joined between MZM modulator is all pi/2, every sub- modulator two-arm RF driving signal it
Between phase difference be all π, realized by phase shifter；The two paths of signals up and down that the upper and lower arms of nested modulator export respectively all can
4k+2 (k=0, ± 1, ± 2 ...) rank sideband is generated, by the way that modulation index m is arranged, makes amplitude proportional in 2 rank Bessel functions2 rank sidebands be zero, then up and down two paths of signals be added generate (± 6, ± 10 ...) rank sideband；Nested modulator is set
Phase difference between the RF driving signal of upper and lower two-arm is π/6, makes 6 rank sidebands of output because opposite in phase adds up to zero, then
Output is mainly 10 rank sidebands, and other 4k+2 rank sideband amplitude very littles for being higher than 10 ranks are negligible；After optical fiber transmits just
10 rank sidebands and minus 10 rank sideband are in photoelectric detector PD beat frequency 20 frequency doubling millimetre wave signals of generation.
2. the generation of 20 times frequency optical millimeter waves according to claim 1 based on nested Mach-Zehnder modulators
Device, it is characterised in that: nested modulator is parallel cascade Mach-Zehnder modulators.
3. the generation device of 20 times frequency optical millimeter waves according to claim 1 based on Mach-Zehnder modulators,
It is characterized by: the modulation index by setting, even ifThat is m=5.953.
4. a kind of 20 times frequency optical millimeter waves production methods based on nested Mach-Zehnder modulators, it is characterised in that: swash
By nested modulator by rf-signal modulation, the two-arm up and down of nested modulator is cascaded by two the light wave that light device issues respectively
MZM modulator constitute, this four MZM modulators are all biased in minimum output point；The two-arm cascade up and down of nested modulator
The phase difference of RF driving signal between MZM modulator is all pi/2, between every sub- modulator two-arm RF driving signal
Phase difference be all π, realized by phase shifter；The addition of two paths of signals up and down of the output of two-arm up and down of nested modulator can generate 4k
+ 2 (k=0, ± 1, ± 2 ...) rank sidebands, main includes ± 2, ± 6 and ± 10 rank sidebands, and other 4k+2 ranks for being higher than 10 ranks are divided
Discharge amplitude very little is negligible；
The amplitude proportional of 2 rank sidebands is in 2 rank Bessel functionsM is modulation index, is referred to by the way that suitable modulation is arranged
Number, makesThe phase difference being arranged between the RF driving signal of nested modulator or more two-arm is π/6, makes upper arm
The 6 rank side band phases that 6 rank sidebands and the lower arm of output export when the two is added on the contrary, offseting each other and being zero；When 2 rank sidebands are
Zero and the 6 rank sidebands addition of two paths of signals is when offseting each other up and down, positive 10 rank sideband and minus 10 rank side after optical fiber transmits
Band generates 20 frequency doubling millimetre wave signals in photoelectric detector PD beat frequency.
5. the 20 times frequency optical millimeter waves generation sides according to claim 4 based on nested Mach-Zehnder modulators
Method, it is characterised in that: input light waveBy nested modulator by frequency be ωmRf-signal modulation, nesting modulation
The two paths of signals up and down of device two-arm output can respectively indicate are as follows:
In formula, m=π Vm/VπIt is the modulation index of MZM modulator, VmIt is the amplitude of radiofrequency signal, VπIt is MZM modulator
Half-wave voltage,It is the phase difference above and below nested modulator between two-arm RF driving signal；
Upper and lower two paths of signals is added the output that can obtain nested modulator are as follows:
Output is 4k+2 (k=0, ± 1, ± 2 ...) rank sideband, and adjusting modulation index m makes2 rank sidebands can be eliminated,
Middle m=5.953, because of the phase difference above and below nested modulator between two-arm RF driving signalAnd two above and below making
6 rank side band phase of road adds up to zero (1+e on the contraryj(4k+2)π/6=0,4k+2=± 6), and other 4k+2 order components for being higher than 10 ranks
Amplitude very little is negligible, therefore the output of nested modulator can simplify are as follows:
Output frequency is 10 ω respectivelymWith -10 ωm± 10 rank sidebands, due to photoelectric detector PD using square-law detect, just
10 rank sidebands and minus 10 rank side can beat frequency 20 frequency doubling millimetre wave signals of generation.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110958053A (en) * | 2019-11-29 | 2020-04-03 | 江苏南方通信科技有限公司 | Device and method for generating quad-frequency optical millimeter wave BPSK vector signal |
| CN111130643A (en) * | 2019-12-06 | 2020-05-08 | 广东工业大学 | Microwave photon phase shifting device with no light filtering and adjustable frequency multiplication factor and method |
| CN114050841A (en) * | 2021-11-24 | 2022-02-15 | 江苏南方通信科技有限公司 | Photo-generated six-frequency-multiplication phase coding microwave signal generation device and method |
| WO2024110927A1 (en) * | 2022-11-25 | 2024-05-30 | Universita' Degli Studi Di Padova | Method and device for photonic pulse modulation |
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2019
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110958053A (en) * | 2019-11-29 | 2020-04-03 | 江苏南方通信科技有限公司 | Device and method for generating quad-frequency optical millimeter wave BPSK vector signal |
| CN111130643A (en) * | 2019-12-06 | 2020-05-08 | 广东工业大学 | Microwave photon phase shifting device with no light filtering and adjustable frequency multiplication factor and method |
| CN111130643B (en) * | 2019-12-06 | 2022-08-12 | 广东工业大学 | Microwave photon phase shifting device with no light filtering and adjustable frequency multiplication factor and method |
| CN114050841A (en) * | 2021-11-24 | 2022-02-15 | 江苏南方通信科技有限公司 | Photo-generated six-frequency-multiplication phase coding microwave signal generation device and method |
| WO2024110927A1 (en) * | 2022-11-25 | 2024-05-30 | Universita' Degli Studi Di Padova | Method and device for photonic pulse modulation |
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