CN106019641B - A kind of polarized orthogonal dual wavelength light signal generation device with frequency interval - Google Patents
A kind of polarized orthogonal dual wavelength light signal generation device with frequency interval Download PDFInfo
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/03—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect
- G02F1/0305—Constructional arrangements
- G02F1/0311—Structural association of optical elements, e.g. lenses, polarizers, phase plates, with the crystal
Abstract
A kind of frequency interval has the polarized orthogonal dual wavelength light signal generating method and its device of big tuning range, the integrated modulator being made of two double parallel MZ Mach-Zehnders in parallel and the Sagnac-ring embedded with narrow band fiber Bragg grating, under signal modulation mode, one double parallel MZ Mach-Zehnder generates the nonlinear optical sideband of carrier wave and high-order, another double parallel MZ Mach-Zehnder is modulated without microwave local oscillation, two output optical signal polarized orthogonal couplings, the two ways of optical signals that polarized orthogonal couples is projected into same direction, inhibit light carrier, obtain high-order dual wavelength light sideband, input is embedded with the Sagnac-ring of fiber bragg grating and polarizing coupler, utilize fiber grating narrowband reflection and broadband transmissison characteristic, realize wavelength separated, selection characteristic is polarized using polarizing coupler, realize dual wavelength light letter The coupling of number polarized orthogonal, in Sagnac-ring output end, obtains the dual wavelength light signal of polarized orthogonal, has the advantages that Clock Multiplier Factor height, tuning range are big.
Description
Technical field
The invention belongs to microwave photon signal generation technology fields, and in particular to a kind of polarized orthogonal with frequency interval
Dual wavelength light signal generation device.
Background technique
Polarized orthogonal dual wavelength light signal refers to that frequency is different, phase is strictly concerned with, orthogonal two lines in polarization direction
Polarized light signal.The optical signal of this form combines wavelength-division multiplex and palarization multiplexing, and the parallel processing of signal may be implemented, mention
High spectrum utilization, the integrated level for reducing interchannel interference and optimization system, therefore in microwave photon filtering, antenna beam shape
Have at, microwave pulse shaping and lossless detection imaging etc. widely due to prospect.In the microwave based on Polarization Modulation
In photonic signal processing system, polarized orthogonal dual wavelength light signal is determined as light carrier input polarization modulator, frequency interval
The final frequency for generating microwave signal is determined.For the tuning performance with final output microwave signal, it is desirable that polarized orthogonal
Dual wavelength light signal frequency interval has big tuning range.
Using microwave photon technology, the polarized orthogonal dual wavelength light with certain frequency interval is generated based on outer Electro-optical Modulation
Signal receives the extensive research of domestic and international scientific research institution.1)L.Campillo,"Orthogonally polarized
Single sideband modulator, " Opt.Lett., vol.32, one is devised in no.21, pp.3152-3154,2007
The polarized orthogonal optical single sideband modulator that kind is made of two light polarization modulators in parallel, it is inclined which can directly modulate generation
The dual wavelength light signal for shaking orthogonal is divided into the frequency of input microwave signal between optical signal frequency；2)J.Zheng,L.Wang,
Z.Dong,et al,“Orthogonal Single-Sideband Signal Generation Using Improved
Sagnac-Loop-Based Modulator,”IEEE Photonics technology letters,vol.26,no.22,
Pp.2229-2231,2014 propose a kind of Sagnac ring structure embedded with single side-band modulator, in conjunction with polarization-maintaining fiber
The wavelength selection and polarization selection characteristic of Bragg grating (PM-FBG), generate the dual wavelength light signal of polarized orthogonal, optical signal
Frequency interval is input microwave signal frequency；3)Z.Li,M.Li,H.Chi,et al,"Photonic generation of
phase-coded millimeter-wave signal with large frequency tunability using a
polarization maintaining fiber Bragg grating,”IEEE Microw.Wireless
Compon.Lett., 21,694-696,2011 generate carrier wave and second order optical sideband using MZ Mach-Zehnder modulation, utilize
Optical filter filters out light carrier, then the dual wavelength light signal of polarized orthogonal is generated by PM-FBG, is divided into input between signal frequency
4 times of radiofrequency signal.
However, above-mentioned each scheme has some limitations.1) the optical signal frequency interval tuning range generated in scheme
It is limited to microwave local oscillation frequency, on the other hand, the modulator of parallel-connection structure does not have an integrated products in scheme, and discrete device makes
With the stability that then will affect system；2) the optical signal frequency interval generated in scheme is limited to microwave local oscillation frequency and PM-FBG
Response spectra, therefore frequency interval is small and tuning performance is poor；3) frequency interval, but frequency are improved by 4 process of frequency multiplication in scheme
Rate tuning performance, which remains unchanged, is limited to the response spectra of PM-FBG.
Summary of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the object of the present invention is to provide a kind of polarizations with frequency interval just
Hand over dual wavelength light signal generation device.Wavelength tunable laser output optical signal inputs integrated modulator as light carrier；Collection
It is made of at modulator two in parallel DPMZM and polarizing couplers；Microwave local oscillation output signal after power amplifier amplifies,
Two-way constant amplitude, the signal with 90 ° of phase differences are generated by 90 ° of Hybrid, inputs two radio frequencies input of a DPMZM respectively
Port, modulation output light carrier and positive and negative quadravalence optical sideband；Another DPMZM is modulated without local oscillation signal, two DPMZM output lights
Signal is coupled together through polarizing coupler cross-polarization, inputs analyzer；Analyzer analyzing angle is adjusted, inhibits light carrier, obtains
Positive and negative quadravalence optical sideband；The input of dual wavelength light signal is embedded with the Sagnac-ring of fiber bragg grating and polarizing coupler, benefit
Characteristic is selected with the narrowband reflection and wide range transmissison characteristic of fiber grating and the polarization of polarizing coupler, obtains polarized orthogonal
The output of dual wavelength light signal.
To achieve the goals above, the technical solution adopted by the present invention is that:
A kind of polarized orthogonal dual wavelength light signal generation device with frequency interval, including Wavelength tunable laser,
Integrated electro-optic modulator, analyzer, optical circulator, polarizing coupler, fiber bragg grating, Polarization Controller, optoisolator,
Wavelength tunable laser is connected with integrated electro-optic modulator, and microwave local oscillation output signal is after power amplifier, with 90 °
Hybrid is connected, and 90 ° of Hybrid export two with double parallel MZ Mach-Zehnder A in integrated electro-optic modulator respectively
Rf inputs mouth is connected, and the output of integrated electro-optic modulator is connected with analyzer, and analyzer is connected with optical circulator,
Optical circulator is connected with the input terminal of polarizing coupler, an output end of polarizing coupler and fiber bragg grating, partially
Vibration controller, optoisolator input terminal be sequentially connected and connect, the another output of optoisolator output end and polarizing coupler
It is connected, constitutes Sagnac ring structure；
The integrated electro-optic modulator by the double parallel MZ Mach-Zehnder A of parallel-connection structure, double parallel Mach once
Dare modulator B and a polarizing coupler are constituted；
The Wavelength tunable laser output optical signal inputs integrated electrooptic modulator, integrated electro-optic as light carrier
Only have double parallel MZ Mach-Zehnder A to be modulated by local oscillation signal in modulator, microwave local oscillation output signal first passes around function
Rate amplifier generates two-way constant amplitude, the signal with 90 ° of phase differences then by 90 ° of Hybrid, inputs double parallel horse respectively
Two rf inputs mouths of conspicuous Zeng Deer modulator A, as two sub- modulators of double parallel MZ Mach-Zehnder A and master
When modulator is all in maximum transmitted point, output optical signal envelope E1(t) for shown in formula (1):
Wherein, E0And ωcRespectively laser output light signal amplitude and frequency, m are double parallel MZ Mach-Zehnder
The A index of modulation, ω are input microwave local oscillation frequency, J4n() is 4n rank one kind Bessel function, and t is the time；
Double parallel MZ Mach-Zehnder B is not modulated by local oscillation signal, is only controlled by direct current biasing, two sub- modulation
Device and MAIN MUX are all located at maximum transmitted point, double parallel MZ Mach-Zehnder A and double parallel MZ Mach-Zehnder B
Output optical signal the orthogonal optical signal of polarization state, integrated electro-optic modulator output end light are coupled as after polarizing coupler
SignalFor shown in formula (2):
Wherein, x and y-axis respectively indicate two polarization axis directions of polarizing coupler；
The two ways of optical signals of polarized orthogonal projects same direction through analyzer rear polarizer direction, and signal power is adjusted
It is whole, ignore the above optical sideband of quadravalence, analyzer output optical signal EPol(t) for shown in formula (3):
EPol(t)∝[J0(m)cosβ+sinβ]exp(jωct)+J4(m)cosβexp(jωct±4ωt) (3)
Wherein, J0() and J4() is respectively 0 rank and 4 rank one kind Bessel functions, and β is that analyzer main shaft and x-axis direction are pressed from both sides
Angle；
Analyzer exports light carrier and positive and negative quadravalence optical sideband, when the condition that meets is shown in formula (4):
J0(m1) β=0 cos β+sin (4)
Light carrier is completely counterbalanced by, and analyzer output end obtains positive and negative quadravalence optical sideband at this time；
Positive and negative quadravalence optical sideband inputs Sagnac ring structure through optical circulator as dual wavelength light signal, first passes around partially
Vibration coupler is divided into the mutually orthogonal two parts of polarization state, anticlockwise optical signal, polarization direction along Y-axis, by light every
It is isolated out from device, clockwise optical signal, polarization direction is born after the effect of fiber bragg grating reflection and transmission along X-axis
Quadravalence signal is reflected back, positive quadravalence signal transmissive, is adjusted Polarization Controller and is revolved positive quadravalence optical signal polarization direction
For Y-axis, another port of input polarization coupler after optoisolator, Y-axis port obtains partially in Sagnac-ring output end
The mutually orthogonal dual wavelength light signal of polarization state, Sagnac-ring output signalFor shown in formula (5):
Wherein, two polarization axis directions that X and Y-axis respectively indicate polarizing coupler are obtained in the output end of optical circulator
The dual wavelength light signal of polarized orthogonal, frequency interval are 8 times for inputting microwave local oscillation frequency；
The integrated electro-optic modulator is polarized by two double parallel MZ Mach-Zehnders of parallel-connection structure and one
Coupler is constituted；
The Sagnac-ring is made of polarizing coupler, fiber bragg grating, Polarization Controller, optoisolator,
Characteristic is selected with the Transflective characteristic of fiber bragg grating and the polarization of polarizing coupler, is realized in Sagnac-ring double
The separation of wavelength channels and polarized orthogonal coupling.
A kind of polarized orthogonal dual wavelength light signal generation device with frequency interval, signal generating method include as follows
Step:
Step 1: under signal modulation mode, generating high-order nonlinear optical sideband, adjustment using integrated electro-optic modulator
Modulator direct current biasing obtains carrier wave and quadravalence optical sideband；
Step 2: according to the polarized orthogonal characteristic of integrated electro-optic modulator output end optical signal, analyzer analyzing angle is adjusted,
Keep light carrier power equal and be completely counterbalanced by, obtains positive and negative quadravalence optical sideband；
Step 3: the dual wavelength light letter of the separation of dual wavelength light signal input wavelength and palarization multiplexing module generation polarized orthogonal
Number, the generation of dual wavelength light signal does not need to be filtered, and system tunning performance is good, output polarized orthogonal dual wavelength light signal
Frequency interval is 8 times for inputting microwave local oscillation frequency, and the frequency interval of output polarized orthogonal dual wavelength light signal can pass through change
Optical source wavelength and microwave local oscillation frequency are tuned.
The beneficial effects of the present invention are:
In the program, the generation of dual wavelength light signal is unglazed filter process, frequency can carry out any tuning；It is double
The frequency interval of wavelength channels is 8 times of input radio frequency signal, can produce High power microwavs millimeter-wave signal or reduction pair
The frequency requirement of microwave local oscillation；The separation of dual wavelength light signal is realized by the narrowband reflection and broadband transmissison characteristic of optical fiber, is polarized
Orthogonal property has the polarization selection characteristic of polarizing coupler to realize, therefore the minimum of final output polarized orthogonal dual wavelength light signal
Frequency interval is the half of fiber grating reflection bandwidth, and 8 times of modulator bandwidth are divided between maximum frequency, and tuning range is number
The hundreds of GHz of GHz-.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is the structural schematic diagram of integrated electro-optic modulator of the invention.
The dual wavelength light signal for analyzer output that Fig. 3 is microwave local oscillation frequency when being 10GHz.
Fig. 4 is fiber bragg grating reflection and transmission spectrum.
The polarized orthogonal dual wavelength light signal for final output that Fig. 5 is microwave local oscillation frequency when being 10GHz.
The polarized orthogonal dual wavelength light signal for final output that Fig. 6 is microwave local oscillation frequency when being 4GHz.
The polarized orthogonal dual wavelength light signal for final output that Fig. 7 is microwave local oscillation frequency when being 11.4GHz.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing:
A kind of polarized orthogonal dual wavelength light signal generation device with frequency interval, including Wavelength tunable laser 1,
Integrated electro-optic modulator 2, analyzer 3, optical circulator 4, polarizing coupler 5, fiber bragg grating 6, Polarization Controller 7, light
Isolator 8；Double parallel MZ Mach-Zehnder A201, double parallel Mach Zeng De of the integrated electro-optic modulator 2 by parallel-connection structure
That modulator B202 and a polarizing coupler 203 are constituted；Electric department point includes microwave local oscillation 9, power amplifier 10 and 90 °
Hybrid 11.Laser 1 is connected with modulator 2, and 9 output signal of microwave local oscillation is after power amplifier 10, with 90 ° of broadband
Hybrid 11 is connected, the 90 ° of Hybrid 11 in broadband output respectively with double parallel MZ Mach-Zehnder A201 in modulator 2
Two rf inputs mouths be connected, the output of modulator 2 is connected with analyzer 3, analyzer 3 also with 4 phase of optical circulator
Connection, optical circulator 4 are also connected with the input terminal of polarizing coupler 5, the output end and optical fiber Bradley of polarizing coupler 5
Lattice grating 6, Polarization Controller 7, optoisolator 8 input terminal be sequentially connected and connect, 8 output end of optoisolator and polarizing coupler 5
Another output be connected, constitute Sagnac ring structure；
1 output optical signal of Wavelength tunable laser inputs integrated modulator 2 as light carrier, and integrated modulator 2 is by double
Parallel MZ Mach-Zehnder A201, double parallel MZ Mach-Zehnder B202 and polarizing coupler 203 are constituted, only double
Parallel MZ Mach-Zehnder A201 is modulated by local oscillation signal.9 output signal of microwave local oscillation first passes around power amplifier 10,
Then by 90 ° of Hybrid 11, two-way constant amplitude, the signal with 90 ° of phase differences are generated, inputs double parallel Mach Zeng De respectively
Two rf inputs mouths of your modulator A201.When in double parallel MZ Mach-Zehnder A201 two sub- modulators and
When MAIN MUX is all in maximum transmitted point, output optical signal envelope E1(t) for shown in formula (1):
Wherein, E0And ωcRespectively laser output light signal amplitude and frequency, m are double parallel MZ Mach-Zehnder
The A201 index of modulation, ω are input microwave local oscillation frequency, J4n() is 4n rank one kind Bessel function, and t is the time；
Double parallel MZ Mach-Zehnder B202 by local oscillation signal Electro-optical Modulation, is not only controlled by direct current biasing, two
A sub- modulator and MAIN MUX are all located at maximum transmitted point.Double parallel MZ Mach-Zehnder A201 and double parallel Mach were once
The output optical signal of Dare modulator B202 is coupled as the orthogonal optical signal of polarization state after polarizing coupler 203.It is integrated
2 output end optical signal of modulatorFor shown in formula (2):
Wherein, x and y-axis respectively indicate two polarization axis directions of polarizing coupler 203；
The two ways of optical signals of polarized orthogonal projects same direction through 3 rear polarizer direction of analyzer, and signal power by
Adjustment, ignores the above optical sideband of quadravalence, analyzer output optical signal Epol(t) for shown in formula (3):
EPol(t)∝[J0(m)cosβ+sinβ]exp(jωct)+J4(m)cosβexp(jωct±4ωt) (3)
Wherein, J0() and J4() is respectively 0 rank and 4 rank one kind Bessel functions, and β is that analyzer main shaft and x-axis direction are pressed from both sides
Angle.
Analyzer exports light carrier and positive and negative quadravalence optical sideband, when the condition that meets is shown in formula (4):
J0(m1) β=0 cos β+sin (4)
Light carrier is completely counterbalanced by, and analyzer output end obtains positive and negative quadravalence optical sideband at this time.RF local oscillator output frequency
When 10GHz, laser output wavelength 1551.395nm, power 13dBm, analyzer exports output dual wavelength optical signal such as Fig. 2 institute
Show；
Positive and negative quadravalence optical sideband inputs Sagnac ring structure through optical circulator 4 as dual wavelength light signal, first passes around
Polarizing coupler 5 divides two parts mutually orthogonal for polarization state, and anticlockwise optical signal (polarization direction is along Y-axis) is by light
Isolator 8 isolates out, and clockwise optical signal (polarization direction is along X-axis) acts on through 6 reflection and transmission of fiber bragg grating
Afterwards, negative quadravalence signal is reflected back, positive quadravalence signal transmissive, and fiber bragg grating reflection and transmission spectrum is as shown in Figure 3.
It adjusts Polarization Controller 7 to revolve positive quadravalence optical signal polarization direction for Y-axis, input polarization coupler 5 is another after optoisolator 8
A port (Y-axis port) obtains the mutually orthogonal dual wavelength light signal of polarization state, Sagnac in Sagnac-ring output end
Ring output signalFor shown in formula (5):
Wherein, X and Y-axis respectively indicate two polarization axis directions of polarizing coupler 5.In the output end of optical circulator, obtain
To the dual wavelength light signal of polarized orthogonal, 8 times of input microwave local oscillation frequency are divided between wave frequency, as shown in Figure 4.
In this method, the generation of dual wavelength light signal is unglazed filter process, frequency can carry out any tuning；It is double
The frequency interval of wavelength channels is 8 times of input radio frequency signal, can produce High power microwavs millimeter-wave signal or reduction pair
The frequency requirement of microwave local oscillation；The separation of dual wavelength light signal is realized by the narrowband reflection and broadband transmissison characteristic of optical fiber, is polarized
Orthogonal property has the polarization selection characteristic of polarizing coupler to realize, therefore the minimum of final output polarized orthogonal dual wavelength light signal
Frequency interval is the half of fiber grating reflection bandwidth, and 8 times of modulator bandwidth are divided between maximum frequency, and tuning range is number
The hundreds of GHz of GHz-.
In order to verify tuning performance of the invention, experiment produces the polarized orthogonal dual wavelength light letter at different frequency interval
Number.
RF local oscillator is 4GHz, optical source wavelength 1551.156nm and RF local oscillator are 11.4GHz, optical source wavelength
The polarized orthogonal dual wavelength light signal difference of 1551.400nm, generation are as follows:
Fig. 5 is RF local oscillator 4GHz, optical source wavelength 1551.156nm when the frequency interval that exports be 32GHz polarized orthogonal
Dual wavelength light signal；
Fig. 6 is RF local oscillator 11.4GHz, optical source wavelength 1551.400nm when the frequency interval that exports be the inclined of 91.2GHz
Shake Orthogonal Double wavelength channels.
Fig. 5 and Fig. 6 shows that the frequency interval for the polarized orthogonal dual wavelength light signal that the device generates has big tuning model
It encloses.
Claims (2)
1. a kind of polarized orthogonal dual wavelength light signal generation device with frequency interval, including Wavelength tunable laser (1),
Integrated electro-optic modulator (2), analyzer (3), optical circulator (4), polarizing coupler (5), fiber bragg grating (6), polarization
Controller (7), optoisolator (8), which is characterized in that Wavelength tunable laser (1) is connected with integrated electro-optic modulator (2)
It connects, microwave local oscillation (9) output signal is connected after power amplifier (10) with 90 ° of Hybrid (11), 90 ° of Hybrid (11)
Export two rf inputs mouth phases with double parallel MZ Mach-Zehnder A (201) in integrated electro-optic modulator (2) respectively
Connection, the output of integrated electro-optic modulator (2) are connected with analyzer (3), and analyzer (3) is connected with optical circulator (4), light
Circulator (4) is connected with the input terminal of polarizing coupler (5), the output end and optical fiber Bragg of polarizing coupler (5)
Grating (6), Polarization Controller (7), optoisolator (8) input terminal be sequentially connected and connect, optoisolator (8) output end and polarization coupling
The another output of clutch (5) is connected, and constitutes Sagnac ring structure；
The integrated electro-optic modulator (2) is by the double parallel MZ Mach-Zehnder A (201) of parallel-connection structure, double parallel horse
Conspicuous Zeng Deer modulator B (202) and a polarizing coupler (203) are constituted；
Wavelength tunable laser (1) output optical signal inputs integrated electrooptic modulator (2) as light carrier, integrates electricity
Only have double parallel MZ Mach-Zehnder A (201) to be modulated by local oscillation signal in optical modulator (2), microwave local oscillation (9) output letter
Number power amplifier (10) are first passed around, then by 90 ° of Hybrid (11), generates two-way constant amplitude, the letter with 90 ° of phase differences
Number, two rf inputs mouths of double parallel MZ Mach-Zehnder A (201) are inputted respectively, when double parallel mach zhender
When the two sub- modulators and MAIN MUX of modulator A (201) are all in maximum transmitted point, output optical signal envelope E1(t)
For shown in formula (1):
Wherein, E0And ωcRespectively laser output light signal amplitude and frequency, m are double parallel MZ Mach-Zehnder A
(201) index of modulation, ω are input microwave local oscillation frequency, J4n() is 4n rank one kind Bessel function, and t is the time；
Double parallel MZ Mach-Zehnder B (202) is not modulated by local oscillation signal, is only controlled by direct current biasing, two sub- tune
Device and MAIN MUX processed are all located at maximum transmitted point, double parallel MZ Mach-Zehnder A (201) and double parallel mach zhender
The output optical signal of modulator B (202) is coupled as the orthogonal optical signal of polarization state after polarizing coupler (203), integrates
Electrooptic modulator (2) output end optical signalFor shown in formula (2):
Wherein, x and y-axis respectively indicate two polarization axis directions of polarizing coupler (203)；
The two ways of optical signals of polarized orthogonal projects same direction through analyzer (3) rear polarizer direction, and signal power is adjusted
It is whole, ignore the above optical sideband of quadravalence, analyzer output optical signal EPol(t) for shown in formula (3):
EPol(t)∝[J0(m)cosβ+sinβ0exp(jωct)+J4(m)cosβexp(jωct±4ωt) (3)
Wherein, J0() and J4() is respectively 0 rank and 4 rank one kind Bessel functions, and β is analyzer main shaft and x-axis direction angle；
Analyzer exports light carrier and positive and negative quadravalence optical sideband, when the condition that meets is shown in formula (4):
J0(m1) β=0 cos β+sin (4)
Light carrier is completely counterbalanced by, and analyzer output end obtains positive and negative quadravalence optical sideband at this time；
Positive and negative quadravalence optical sideband inputs Sagnac ring structure through optical circulator (4) as dual wavelength light signal, first passes around partially
Vibration coupler (5) is divided into the mutually orthogonal two parts of polarization state, and anticlockwise optical signal, polarization direction is along Y-axis, by light
Isolator (8) isolates out, clockwise optical signal, and polarization direction is along X-axis, through fiber bragg grating (6) reflection and transmission
After effect, negative quadravalence signal is reflected back, positive quadravalence signal transmissive, is adjusted Polarization Controller (7) and is believed positive quadravalence light
The rotation of number polarization direction is Y-axis, input polarization coupler (5) another port, Y-axis port, in Sagner after optoisolator (8)
Gram ring output end, obtains the mutually orthogonal dual wavelength light signal of polarization state, Sagnac-ring output signalFor formula (5)
It is shown:
Wherein, two polarization axis directions that X and Y-axis respectively indicate polarizing coupler (5) are obtained in the output end of optical circulator
The dual wavelength light signal of polarized orthogonal, frequency interval are 8 times for inputting microwave local oscillation frequency；
The integrated electro-optic modulator by parallel-connection structure two double parallel MZ Mach-Zehnders and a polarization coupled
Device is constituted；
The Sagnac-ring is made of polarizing coupler, fiber bragg grating, Polarization Controller, optoisolator, is used up
The Transflective characteristic of fine Bragg grating and the polarization of polarizing coupler select characteristic, and dual wavelength is realized in Sagnac-ring
The separation of optical signal and polarized orthogonal coupling.
2. a kind of polarized orthogonal dual wavelength light signal generation device with frequency interval according to claim 1, special
Sign is that signal generating method includes the following steps:
Step 1: under signal modulation mode, generating high-order nonlinear optical sideband, adjustment modulation using integrated electro-optic modulator
Device direct current biasing obtains carrier wave and quadravalence optical sideband；
Step 2: according to the polarized orthogonal characteristic of integrated electro-optic modulator output end optical signal, adjusting analyzer analyzing angle, make light
Carrier power is equal and is completely counterbalanced by, and obtains positive and negative quadravalence optical sideband；
Step 3: the dual wavelength light signal of the separation of dual wavelength light signal input wavelength and palarization multiplexing module generation polarized orthogonal, it is double
The generation of wavelength channels does not need to be filtered, and system tunning performance is good, exports the frequency of polarized orthogonal dual wavelength light signal
Between be divided into input 8 times of microwave local oscillation frequency, the frequency interval for exporting polarized orthogonal dual wavelength light signal, which can pass through, changes light source
Wavelength and microwave local oscillation frequency are tuned.
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| 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 |
| CN109494555A (en) * | 2018-12-29 | 2019-03-19 | 北京信息科技大学 | Adjustable optic fibre laser based on cascaded fiber grating combination Sagnac ring |
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| CN113472445B (en) * | 2021-06-25 | 2022-07-05 | 西北工业大学 | Dual-band RoF system based on PDM-DPMZM and adjusting method |
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