CN104865714B - A kind of production method of ultra-wide optical frequency com - Google Patents
A kind of production method of ultra-wide optical frequency com Download PDFInfo
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- CN104865714B CN104865714B CN201510210264.4A CN201510210264A CN104865714B CN 104865714 B CN104865714 B CN 104865714B CN 201510210264 A CN201510210264 A CN 201510210264A CN 104865714 B CN104865714 B CN 104865714B
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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
- G02F1/17—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 variable-absorption elements not provided for in groups G02F1/015 - G02F1/169
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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
- G02F2203/00—Function characteristic
- G02F2203/56—Frequency comb synthesizer
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention discloses a kind of production method of ultra-wide optical frequency com, this method comprises the following steps：The tunable laser source (TLD) of multiple different wave lengths is coupled, it is injected into the first electroabsorption modulator (EAM1) and frequency modulator (FM), the both sides of each laser source wavelength obtain the New cultivars of identical spacing and identical quantity；Then, by each flat spectral line of the second electroabsorption modulator (EAM2)；Finally, bandwidth of the adjacent light source wavelength spacing just for New cultivars at each wavelength is set so that the spacing of every spectral line is equal.Cascade structure based on two electroabsorption modulators and a frequency modulator, using the light source of multiple different wave lengths, generates spectral bandwidth 16.52THz, flatness<2dB 22GHz ultra-wide optical frequency coms.The optical frequency com that this method is produced is respectively provided with advantage in flatness and spectral bandwidth, and separation of spectra is tunable.The system operatio of the present invention is simple, and output noise is low, and the optical frequency com performance of generation is good.
Description
Technical field
The present invention relates to the generation technology field of optical frequency com, more particularly to a kind of production of the optical frequency com of ultra-wide
Raw technology.
Background technology
Optical frequency com (OFC) is a kind of new stabilized light source after laser, and its spectrum is equidistant by comb teeth-shaped
The discrete spectral line of distribution is constituted.OFC technologies as ultra-fast optical and precision spectroscopy perfect adaptation, superhigh precision detect,
There is important application in terms of chemical composition quick detection, super laser configuration and long haul communication.
At present, OFC generation technology has caused the concern of some scholars, and achieves and significantly achieve.It is existing
OFC production methods are broadly divided into following several：It is based on micro-ring resonant cavity, based on high-order nonlinear optical fiber, based on F-P resonance
It is device, based on optical-electronic oscillator and based on modulator.Wherein, the OFC production methods based on modulator, with the letter of its structure
Single, it is easy to tune, steady performance turns into the first choice of numerous scholars.
But, the OFC generation technologies based on modulator up to the present, the advantage in bandwidth and flatness can not be simultaneous
Tool, it is impossible to obtain wide and flat perfect optics frequency comb.Therefore, while modulation depth is increased, the flat of OFC is also improved
Smooth degree.
The content of the invention
Technical problem：It is an object of the invention to provide a kind of ultra-wide optics based on electroabsorption modulator and frequency modulator
The production method of frequency comb.The modulation depth of frequency modulator is high, it is possible to reduce the use number of modulator, and it is solid to produce bandwidth
Fixed OFC.Therefore, multiple wavelength light sources are injected into light path simultaneously, are replicated at each wavelength and produce identical light comb, only needed
It is simply to set wavelength spacing, it is possible to expand OFC bandwidth.In addition, the use of electroabsorption modulator so that ultra-wide optics frequency
The flatness of rate comb is reduced in the range of 2dB.Finally, the good ultra-wide optical frequency com of flatness is generated, is overcome existing
The problem of bandwidth and flatness can not have concurrently in OFC generation technologies.
Technical scheme：A kind of production method of ultra-wide optical frequency com of the present invention comprises the following steps：
The tunable laser source of multiple different wave lengths is coupled, the first electroabsorption modulator and frequency modulator is injected into
In, the both sides of each laser source wavelength obtain the New cultivars of identical spacing and identical quantity；
Then, by each flat spectral line of the second electroabsorption modulator；
Finally, bandwidth of the adjacent light source wavelength spacing just for New cultivars at each wavelength is set so that between every spectral line
Away from equal.
The tunable laser source of described different wave length is sent by tunable laser, and the spacing of each wavelength is each ripple
The bandwidth of strong point New cultivars.
Described the first electroabsorption modulator and the second electroabsorption modulator is MQW electroabsorption modulator, the two
Equal reverse bias.
Frequency modulator amounts of frequency offset is 600GHz.
The frequency-tunable of described driving rf signal, is that two electroabsorption modulators and frequency modulator provide drive
Dynamic voltage, and determine the separation of spectra of optical frequency com.
Beneficial effect：The production method of ultra-wide optical frequency com proposed by the present invention, the optical frequency com of generation has good
Good optical characteristics, has advantage concurrently in flatness and spectral bandwidth, can be in optics random waveform and ultrashort light pulse
There is important application in generation.
Innovation is：
(1) foundation structure cascaded using electroabsorption modulator with frequency modulator so that produced at each optical source wavelength
Sub-light that identical is tunable is combed.This sub-light comb is fixed with bandwidth, and the characteristics of whole spectral line power levels are close successfully solves
When all sub-light tree structures are into ultra-wide optical frequency com, sub-light comb is combed flat caused by adjacent part spectral line power dip with sub-light
Smooth degree deterioration problem.
(2) electroabsorption modulator used has output noise low, it is easy to the advantages of integrated, while can further optimize
Ultra-wide OFC flatness.
(3) complicated state modulator is not needed, it is only necessary to keep optical source wavelength spacing to be equal to sub-light and comb bandwidth.
(4) produce optical frequency com advantageous in flatness and spectral bandwidth, change radio frequency signal frequency, control light
Source number simultaneously adjusts optical source wavelength spacing, the optical frequency com of separation of spectra and bandwidth needed for can obtaining.
Brief description of the drawings
Fig. 1 is the structure chart of the generation device of ultra-wide optical frequency com of the present invention.
Wherein have：Tunable laser TLD, the first electroabsorption modulator EAM1, the second electroabsorption modulator EAM2, frequency
Modulator FM, RF driving signal RF, phase-shifter PS, spectroanalysis instrument OSA.
Fig. 2 is the spectrogram for four broadening light sources that four different light sources are obtained by the first electroabsorption modulator.
Fig. 3 is the spectrogram for four sub- light combs that four broadening light sources are obtained by frequency modulator.
Fig. 4 is the spectrogram for four sub- light combs that four sub- light combs are obtained by the second electroabsorption modulator.
In the case of Fig. 5 is four different light source, the spectrogram of obtained ultra-wide optical frequency com.
In the case of Fig. 6 is 28 different light source, the spectrogram of obtained ultra-wide optical frequency com.
Embodiment
The OFC production methods of the present invention are, based on electroabsorption modulator and frequency modulator, and to make use of multiple adjustable
The ultra-wide OFC of humorous light source production method.The light path includes multiple tunable optical sources, two electroabsorption modulators, a frequency
Modulator and the driving rf signal source that voltage is provided for modulator.Obtain flat in the second electroabsorption modulator output end
The ultra-wide OFC spent.
The lasing light emitter of described different wave length is sent by tunable laser, and the spacing of each optical source wavelength is just each ripple
The bandwidth of strong point New cultivars.
Two described electroabsorption modulators are MQW electroabsorption modulator, the two equal reverse bias.In light path
In effect be respectively：Enter the smooth ultra-wide OFC of line broadening peace spectrum centered on each laser source wavelength.
Described frequency modulator amounts of frequency offset is 600GHz, and modulate intensity is high, and modulation bandwidth is fixed.
The frequency-tunable of described driving rf signal, driving voltage, and electric signal frequency are provided for three modulators
Rate determines the separation of spectra of optical frequency com.
The tunable laser source coupling of multiple different wave lengths, is injected into electroabsorption modulator and frequency modulator, each
The both sides of laser source wavelength obtain identical spacing, the New cultivars of identical quantity.It is flat each by an electroabsorption modulator again
Individual spectral line, finally sets bandwidth of the adjacent light source wavelength spacing just for New cultivars at each wavelength so that ultra-wide OFC every spectrum
Line spacing is equal.Realize the good ultra-wide OFC of flatness generation.
The present invention devises a kind of production method of ultra-wide optical frequency com, comprises the following steps：Each light source is by electricity
Absorption modulation device broadening, angle modulated is carried out by frequency modulator, is produced bandwidth and is fixed the slightly poor sub-light comb of flatness.Often
The sub-light comb that individual light source is produced passes through electroabsorption modulator, the spectral line power difference value reduction of sub-light comb, per height simultaneously again
Light comb will become flat.The amount of bandwidth for setting adjacent light source centre frequency spacing just to be combed for sub-light, then spacing between sub-light is combed
Just it is separation of spectra.So as to the ultra-wide OFC produced, the strict equidistantly distributed of every spectral line of its spectrum.Wherein, three modulation
Device drives by same radio-frequency signal source.
Light source power 1mW, line width is 10MHz；Two equal reverse bias of electroabsorption modulator, bias voltage is 1V, modulation
Voltage 2V；Frequency modulator amounts of frequency offset 600GHz；Rf signal frequency-tunable, driving voltage is provided for three modulators.
Before radiofrequency signal is applied on frequency modulator, a phase-shifter is first passed through so that 90 ° of phase offset, keeps neighboring modulators
Drive signal phase it is different.Obtained optical frequency com is observed by spectroanalysis instrument, and its band is obtained by calculating
Wide and flat angle value.
The production method of ultra-wide optical frequency com is further elaborated with reference to example.
Embodiment one
1st, four different light sources pass through electroabsorption modulator broadening, and electroabsorption modulator is driven by 26GHz radiofrequency signal
It is dynamic, obtained four 26GHz stretched-out spectrum (see accompanying drawing 2).It is injected into frequency modulator and carries out angle modulated, frequency modulator
Driving voltage is provided by same radiofrequency signal, but phase offset by 90 ° by phase-shifter.Four are generated with a width of 598GHz,
Separation of spectra is that the sub-light that 26GHz, flatness are 5.57dB is combed (see accompanying drawing 3).
2nd, four sub- light combs are re-injected into electroabsorption modulator, electroabsorption modulator by same 26GHz radio frequency
Signal drives, and four sub- light comb flatnesses of output are optimized for 2.52dB (see accompanying drawing 4).
3rd, set four optical source wavelength spacing to be 594GHz, generate bandwidth 2.288THz, flatness is the super of 1.44dB
Wide optical frequency com (see accompanying drawing 5).
Embodiment two
Implementation steps such as embodiment 1.Number of light sources is increased to 28, separation of spectra 22GHz, spectral bandwidth can be obtained
16.52THz, flatness<2dB ultra-wide optical frequency com (see accompanying drawing 6, illustration I and II are two partial spectrum enlarged drawings).
Claims (4)
1. a kind of production method of ultra-wide optical frequency com, it is characterised in that this method comprises the following steps：
The tunable laser source of multiple different wave lengths is coupled, is injected into the first electroabsorption modulator and frequency modulator, often
The both sides of individual laser source wavelength obtain the New cultivars of identical spacing and identical quantity；
Then, by each flat spectral line of the second electroabsorption modulator；
Finally, bandwidth of the adjacent light source wavelength spacing just for New cultivars at each wavelength is set so that the spacing phase of every spectral line
Deng；
Described the first electroabsorption modulator, the second electroabsorption modulator, frequency modulator, its driving voltage are penetrated by tunable
The frequency of frequency electric signal is provided, and determines the separation of spectra of optical frequency com.
2. a kind of production method of ultra-wide optical frequency com according to claim 1, it is characterised in that：Described different ripples
Long tunable laser source is sent by tunable laser, and the spacing of each wavelength is the bandwidth of New cultivars at each wavelength.
3. the production method of ultra-wide optical frequency com according to claim 1, it is characterised in that：The first described electric absorption
Modulator and the second electroabsorption modulator are MQW electroabsorption modulator, the two equal reverse bias.
4. the production method of ultra-wide optical frequency com according to claim 1, it is characterised in that：Described frequency modulator
Amounts of frequency offset is 600GHz.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105629520B (en) * | 2016-01-18 | 2018-03-06 | 南京邮电大学 | A kind of wide and flat tunable optical frequency comb generation method |
| DE102017201285B4 (en) | 2016-12-09 | 2021-01-28 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e. V. | Laser assembly and method of making a laser assembly |
| FR3066830B1 (en) * | 2017-05-23 | 2019-07-12 | Centre National D'etudes Spatiales | METHOD FOR GENERATING FREQUENCY COMBINATIONS, ASSOCIATED GENERATION MODULE, REMOTE SPECTROSCOPY METHOD, AND ASSOCIATED SPECTROSCOPY DEVICE |
| CN110365413A (en) * | 2019-07-03 | 2019-10-22 | 北京迈微时代科技有限公司 | A kind of light load radio frequency beam shaping system based on relevant frequency comb |
| CN112987442A (en) * | 2021-02-24 | 2021-06-18 | 南京邮电大学 | Broadband tunable optical frequency comb generation device and method |
| CN114815433B (en) * | 2022-04-26 | 2023-04-18 | 电子科技大学 | Optical frequency comb generating device |
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| CN102338965A (en) * | 2011-08-24 | 2012-02-01 | 武汉邮电科学研究院 | Method for producing ultra-wide spectrum optical comb |
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| CN103415800A (en) * | 2011-03-07 | 2013-11-27 | 阿尔卡特朗讯 | A tunable optical frequency comb generator |
| CN103631036A (en) * | 2013-11-14 | 2014-03-12 | 西安电子科技大学 | Production method of adjustable optical frequency combs |
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| CN101401032A (en) * | 2006-03-15 | 2009-04-01 | 独立行政法人情报通信研究机构 | Super flat optical frequency com signal generator |
| CN103415800A (en) * | 2011-03-07 | 2013-11-27 | 阿尔卡特朗讯 | A tunable optical frequency comb generator |
| CN102338965A (en) * | 2011-08-24 | 2012-02-01 | 武汉邮电科学研究院 | Method for producing ultra-wide spectrum optical comb |
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Application publication date: 20150826 Assignee: NANJING UNIVERSITY OF POSTS AND TELECOMMUNICATIONS INSTITUTE AT NANTONG Co.,Ltd. Assignor: NANJING University OF POSTS AND TELECOMMUNICATIONS Contract record no.: X2020980006914 Denomination of invention: A generation method of ultra wide optical frequency comb Granted publication date: 20170929 License type: Common License Record date: 20201021 |
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