CN108594478A - The generation device and method of super flat optical frequency com based on dual-polarization modulator - Google Patents
The generation device and method of super flat optical frequency com based on dual-polarization modulator Download PDFInfo
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- CN108594478A CN108594478A CN201810238322.8A CN201810238322A CN108594478A CN 108594478 A CN108594478 A CN 108594478A CN 201810238322 A CN201810238322 A CN 201810238322A CN 108594478 A CN108594478 A CN 108594478A
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- optical frequency
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- polarization modulator
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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
- G02F1/0121—Operation of devices; Circuit arrangements, not otherwise provided for in this subclass
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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
- G02F1/0102—Constructional details, not otherwise provided for in this subclass
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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
- G02F1/0136—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 for the control of polarisation, e.g. state of polarisation [SOP] control, polarisation scrambling, TE-TM mode conversion or separation
Abstract
The invention belongs to technical field of photo communication, disclose a kind of generation device and method of the super flat optical frequency com based on dual-polarization modulator, the amplitude of radio-frequency signal source and the bias voltage size of direct voltage source are set, adjust the polarization angle of Polarization Controller, super flat luminous power is obtained, and optical frequency com is adjustable.The super flat optical frequency com of 9 lines is produced, and the optical frequency com line number for realizing the structure is adjustable, spectral line interval is adjustable by adjusting the radio frequency amplitude and DC offset voltage of two branch MZ Mach-Zehnders using dual-polarization modulator structure.The radio-frequency signal source output power used in the present invention is not very big, relatively easy satisfaction；The optical frequency com of generation inhibits relatively high, is conducive to practical application.The optical frequency com better performances that the present invention generates, system structure is relatively easy, easy to implement, can be effectively reduced system cost, is of great significance to its application and development in optical communication field.
Description
Technical field
The invention belongs to technical field of photo communication more particularly to a kind of super flat optical frequencies based on dual-polarization modulator
The generation device and method of comb.
Background technology
Currently, there are mainly four types of optical frequency com generation technologies commonly used in the trade.When the scheme based on photoelectricity resonator,
The optical frequency com flatness that principle novelty generates is functional, but resonant cavity is easy affected by environment, adjustability and stabilization
Property is poor, so this scheme is constantly present defect；Second is that the scheme based on micro-ring resonant cavity, pump light source is in certain item in scheme
Whispering-gallery-mode can be generated under part in micro-ring resonant cavity, the frequency spectrum shape of incident light is broadened using the special nature of the Echo Wall
At optical frequency com, however its showed on flatness index it is poor；Third, based on the non-linear effect in nonlinearity medium
It answers, the optical frequency com of broad spectrum can be generated, but the non-linear process in scheme is difficult to accurately control, and need to use
High power amplifier and photon filter, cost are higher；Fourth, external modulation technology, the generation and modulation of laser are separated, with only
The output optical signal of vertical modulators modulate laser realizes the raising of modulation rate and receiving sensitivity.This mode it is excellent
Gesture is increasingly apparent, is particularly suitable for the wavelength-division multiplex and coherent optical communication system of large capacity.Present existing a variety of external modulation sides
Case, such as use intensity modulator, phase-modulator or Mach-Zehnder modulators (DPMZM) etc..Use two intensity modulateds
Device and a phase-modulator cascading can generate the 38 line super flat optical frequency coms that flatness is less than 1dB, but must
Specific radio frequency waveform must be used, excessively high to technology precise requirements, production cost increases therewith.It can using double parallel DPMZM
7 line optics frequency combs are generated, but three bias voltages of DPMZM must be strictly controlled and can be only achieved good power flatness.
In conclusion external modulation technology used at present is between the flatness and technical operation for realizing optical frequency com
Be extremely difficult to balance, the usual equipment of scheme that can obtain super flat optical frequency com is complicated, operation require accurate, cost compared with
Height is unfavorable for practical application.
Light comb generation technique based on external modulation is domestic and international optical communication technique of greatest concern, most having potential using value
One of, external modulation technology can be enriched, external modulator application scheme easy to operate, that performance is good is created on the basis of existing, and
Flatness optical frequency com of good performance is generated, is of great significance to the application development of optical communication field.
Invention content
In view of the problems of the existing technology, the super flat optical frequency that the present invention provides a kind of based on dual-polarization modulator
The generation device and method of rate comb.
The invention is realized in this way a kind of production method of the super flat optical frequency com based on dual-polarization modulator,
The production method of the super flat optical frequency com based on dual-polarization modulator is by being arranged the amplitude of radio-frequency signal source and straight
The bias voltage size of galvanic electricity potential source adjusts the polarization angle of Polarization Controller, obtains super flat luminous power, and optical frequency
It combs adjustable.
Further, the production method of the super flat optical frequency com based on dual-polarization modulator includes the following steps：
Step 1, it is the continuous light waves of 1550nm that light source, which generates operation wavelength, and it is 3.5V that continuous light wave, which is input to half-wave voltage,
Dual-polarization modulator in；The radiofrequency signal of 10GHz is divided into Liang Ge branches by power divider, is put respectively by two electricity
Big device amplification, upper branch adjust rf frequency by 2 times of multipliers and are then input to upper arm MZM-1, and lower branch is directly inputted to
Underarm MZM-2；
Step 2, the frequency for inputting the RF driving signal of MZM-1 is 20GHz, amplitude 2.05V, and its direct current is arranged
Voltage output is 0.55V, generates the flat light comb of 5 lines, separation of spectra 20GHz；
Step 3, underarm MZM-2, RF driving signal frequency are 10GHz；
Step 4, adjusts angle of polarization α, and the amplitude of two optical frequency coms obtained by two sub- modulators is equal, MZM-
1 polarizes in transmision peak, obtains 9 linear lights comb.
Another object of the present invention is to provide a kind of super flat optical frequency coms based on dual-polarization modulator
The generation device of the super flat optical frequency com based on dual-polarization modulator of production method, it is described based on dual-polarization modulator
The generation device of super flat optical frequency com is provided with：
Laser；
The light source output port of laser connects with the input port of dual-polarization modulator；The output port of radio-frequency signal source
After dividing two-way, the first via to carry out 2 times of processing, by the rf inputs of amplifier and the sub- modulator MZM-1 of dual-polarization modulator
Mouth connects, and the second tunnel connects by amplifier with the rf inputs mouth of the sub- modulator MZM-2 of dual-polarization modulator；Direct current
The output end of potential source DC1 connects with the DC port of sub- modulator MZM-1, the output end of direct voltage source DC2 and sub- modulator
The DC port of MZM-2 connects；The output port of dual-polarization modulator divides after Polarization Controller, light polarization modulator with spectrum
Analyzer connects, and measures the spectrogram of the optical frequency com of generation.
Further, the dual-polarization modulator is by polarization beam apparatus, two Mach-Zehnder modulators, polarization beam combiners
Totally four parts are constituted.
Another object of the present invention is to provide the super flat optical frequencies based on dual-polarization modulator described in a kind of application
The laser of the production method of comb.
In conclusion advantages of the present invention and good effect are：Believe by adjusting the radio frequency of DPol-MZM upper arm MZM-1
Number amplitude generates 5 linear lights comb with DC voltage bias, and generates 4 linear lights comb in the biasing of minimum transfer point by underarm MZM-2.
If the optical frequency com frequency interval generated by MZM-2 is twice of the optical frequency com frequency interval that MZM-1 is generated, just
The optical frequency com of 9 lines can be generated by DPol-MZM.When using cascaded modulator, pectination line number can increase, and may be implemented
The extension of frequency spectrum.The present invention carries out external modulation to generate optical frequency com using dual-polarization modulator (DPol-MZM), passes through tune
The radio frequency amplitude and DC offset voltage for saving the sub- modulators of DPol-MZM or more, adjust the polarization angle of Polarization Controller, generate
9 lines super flat optical frequency coms, and inhibit relatively high.Super flat characteristic, and the adjustable, spectral line with line number can be obtained
It is spaced the advantages that adjustable, inhibition is relatively high, is of great significance to its application and development in optical communication field.
Description of the drawings
Fig. 1 is the generation device knot of the super flat optical frequency com provided in an embodiment of the present invention based on dual-polarization modulator
Structure schematic diagram；
In figure：1, laser；2, Polarization Controller；3, polarization beam apparatus；4, dual-polarization modulator；5, radio-frequency signal source；
6, amplifier；7, amplifier；8, direct voltage source；9, direct voltage source；10, polarization beam combiner；11, Polarization Controller；12, partially
Shake modulator；13, spectroanalysis instrument.
Fig. 2 is the production method stream of the super flat optical frequency com provided in an embodiment of the present invention based on dual-polarization modulator
Cheng Tu.
Fig. 3 is that the sub- modulator MZM-1 of dual-polarization modulator upper arm provided in an embodiment of the present invention generates the flat light comb of 5 lines,
The sub- modulator MZM-2 of underarm generates the flat light comb of 4 lines, the final output light spectrogram for generating the flat light comb of 9 lines.
Fig. 4 is the experimental spectrum figure provided in an embodiment of the present invention for generating the flat light comb of 9 lines.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
The present invention adjusts Polarization Control by the bias voltage size of the amplitude and direct voltage source of setting radio-frequency signal source
The polarization angle of device obtains super flat luminous power, and optical frequency com is adjustable.Present device is simple, can greatly reduce
The quantity of light source in wdm system is very suitable for, for carrying out precision optics research and application, comparing to reduce system cost
The prior art has larger advantage.
The application principle of the present invention is further described below in conjunction with the accompanying drawings.
As shown in Figure 1, the generation of the super flat optical frequency com provided in an embodiment of the present invention based on dual-polarization modulator
Device includes：Including laser 1, Polarization Controller 2, Polarization Controller 11, polarization beam apparatus 3, polarization beam combiner 10, radio frequency letter
Number source 5, amplifier 6, amplifier 7, direct voltage source 8, direct voltage source 9, dual-polarization modulator 4, light polarization modulator 12, spectrum
Analyzer 13.
Wherein dual-polarization modulator 4 is by polarization beam apparatus 3, two Mach-Zehnder modulators, polarization beam combiners 10 totally four
Part is constituted.The light source output port of laser 1 connects with the input port of dual-polarization modulator 4；The output of radio-frequency signal source 5
After port divides two-way, the first via to carry out 2 times of processing, by the radio frequency of amplifier 6 and 4 sub- modulator MZM-1 of dual-polarization modulator
Input port connects, and the rf inputs mouth phase of amplifier 7 and 4 sub- modulator MZM-2 of dual-polarization modulator is passed through on the second tunnel
It connects；The output end of direct voltage source 8 connects with the DC port of sub- modulator MZM-1, and output end and the son of direct voltage source 9 are adjusted
The DC port of device MZM-2 processed connects；The output port of dual-polarization modulator 4 is by Polarization Controller 11, light polarization modulator 12
Connect afterwards with spectroanalysis instrument 13, measures the spectrogram of the optical frequency com of device generation.
As shown in Fig. 2, the generation of the super flat optical frequency com provided in an embodiment of the present invention based on dual-polarization modulator
Method includes：
S201：It is the continuous light waves of 1550nm that light source, which generates operation wavelength, and it is 3.5V's that continuous light wave, which is input to half-wave voltage,
In dual-polarization modulator.The radiofrequency signal of 10GHz is divided into Liang Ge branches by power divider, then passes through two electricity respectively
Amplifier amplifies, and upper branch adjusts rf frequency by 2 times of multipliers and is then input to upper arm MZM-1, and lower branch directly inputs
To underarm MZM-2；
S202：The frequency for inputting the RF driving signal of MZM-1 is 20GHz, amplitude 2.05V, and its direct current is arranged
Pressure output is 0.55V, to produce the flat light comb of 5 lines, as shown in figure 3, separation of spectra is 20GHz；
S203：Underarm MZM-2, it is 10GHz that its RF driving signal frequency, which is arranged,.As described above, MZM-2 is in most brief biography
Defeated point polarization, the even-order harmonic of MZM-2 are suppressed.RF signal power with input MZM-1 increases, radio-frequency modulations exponent m2
When=3.05, the flat light comb of 4 lines that separation of spectra is 20GHz can be obtained as shown in Figure 3；
S204：Angle of polarization α is adjusted, the amplitude of two optical frequency coms obtained by two sub- modulators is equal.As with
Upper analysis, MZM-1 are polarized in transmision peak.So as shown in figure 3, obtaining 9 linear lights comb.The numerical analysis one initial with us
It causes.
The application effect of the present invention is explained in detail with reference to the performance of super flat optical frequency com.
The continuous laser that centre wavelength is 1550nm is set, DPOL-MZM is injected by Polarization Controller PC1.DPOL-MZM
The sub- modulator of two-arm has three dB bandwidth, the frequency of 30GHz and the half-wave voltage of 3.5V@21.5GHz.The RF of 10GHz believes
Number Liang Ge branches are divided by power divider, then amplified through two electric amplifiers, while top set uses 2 times of multipliers
To adjust rf frequency.It can observe the flat optical frequency com of upper and lower branch respectively using spectroanalysis instrument (OSA).It is logical
The amplitude and angle of polarization α of adjustment RF1, RF2, DC1 are crossed, as shown in figure 3, the optical frequency com of 9 lines can be obtained, flatness is about
For 0.63dB, inhibit than being 17.5dB.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement etc., should all be included in the protection scope of the present invention made by within refreshing and principle.
Claims (5)
1. a kind of production method of the super flat optical frequency com based on dual-polarization modulator, which is characterized in that described based on double
The biasing of the amplitude and direct voltage source of the production method setting radio-frequency signal source of the super flat optical frequency com of light polarization modulator
Voltage swing adjusts the polarization angle of Polarization Controller, obtains super flat luminous power, and optical frequency com is adjustable.
2. the production method of the super flat optical frequency com as described in claim 1 based on dual-polarization modulator, feature exist
In the production method of the super flat optical frequency com based on dual-polarization modulator includes the following steps：
Step 1, it is the continuous light waves of 1550nm that light source, which generates operation wavelength, and it is the double of 3.5V that continuous light wave, which is input to half-wave voltage,
In light polarization modulator；The radiofrequency signal of 10GHz is divided into Liang Ge branches by power divider, passes through two electric amplifiers respectively
Amplification, upper branch adjust rf frequency by 2 times of multipliers and are then input to upper arm MZM-1, and lower branch is directly inputted to underarm
MZM-2；
Step 2, the frequency for inputting the RF driving signal of MZM-1 is 20GHz, amplitude 2.05V, and its DC voltage is arranged
Output is 0.55V, generates the flat light comb of 5 lines, separation of spectra 20GHz；
Step 3, underarm MZM-2, RF driving signal frequency are 10GHz；
Step 4, adjusts angle of polarization α, and the amplitude of two optical frequency coms obtained by two sub- modulators is equal, and MZM-1 is being passed
Defeated peak value polarization, obtains 9 linear lights comb.
3. a kind of production method of super flat optical frequency com as described in claim 1 based on dual-polarization modulator based on double
The generation device of the super flat optical frequency com of light polarization modulator, which is characterized in that described based on the super flat of dual-polarization modulator
The generation device of smooth optical frequency com is provided with：
Laser；
The light source output port of laser connects with the input port of dual-polarization modulator；The output port of radio-frequency signal source is divided to two
Road, after the first via carries out 2 times of processing, by the rf inputs mouth phase of amplifier and the sub- modulator MZM-1 of dual-polarization modulator
It connects, the second tunnel connects by amplifier with the rf inputs mouth of the sub- modulator MZM-2 of dual-polarization modulator；Direct voltage source
The output end of DC1 connects with the DC port of sub- modulator MZM-1, the output end of direct voltage source DC2 and sub- modulator MZM-2
DC port connect；The output port of dual-polarization modulator after Polarization Controller, light polarization modulator with spectroanalysis instrument
Connect, measures the spectrogram of the optical frequency com of generation.
4. the generation of the super flat optical frequency com based on dual-polarization modulator of production method as claimed in claim 3 fills
It sets, which is characterized in that the dual-polarization modulator is total by polarization beam apparatus, two Mach-Zehnder modulators, polarization beam combiners
Four parts are constituted.
5. a kind of production using the super flat optical frequency com based on dual-polarization modulator described in claim 1~2 any one
The laser of generation method.
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| CN109743115A (en) * | 2018-12-05 | 2019-05-10 | 南京邮电大学 | The microwave frequency comb generation device and method of numerical control light heterodyne method based on MZM |
| CN111106872A (en) * | 2019-12-31 | 2020-05-05 | 上海交通大学 | Device and method for generating optical frequency comb based on cascaded double parallel Mach-Zehnder modulators |
| CN113009630A (en) * | 2021-02-24 | 2021-06-22 | 天津大学 | Optical frequency comb generation device and method based on nonlinear optical loop mirror |
| CN113281917A (en) * | 2021-05-14 | 2021-08-20 | 天津大学 | Optical frequency comb generation system and method |
| CN114815433A (en) * | 2022-04-26 | 2022-07-29 | 电子科技大学 | Optical frequency comb generating device |
| CN115396036A (en) * | 2022-08-18 | 2022-11-25 | 西安电子科技大学 | Broadband optical frequency comb generation method based on DPMZM and two IM cascades |
| US11549860B2 (en) * | 2020-05-25 | 2023-01-10 | Aragon Photonics Labs S.L.U. | Method and system for interrogating optical fibers |
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