CN103513491B - A kind of method and apparatus producing optical frequency com based on Parabolic Phase modulation - Google Patents
A kind of method and apparatus producing optical frequency com based on Parabolic Phase modulation Download PDFInfo
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- CN103513491B CN103513491B CN201310442464.3A CN201310442464A CN103513491B CN 103513491 B CN103513491 B CN 103513491B CN 201310442464 A CN201310442464 A CN 201310442464A CN 103513491 B CN103513491 B CN 103513491B
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Abstract
The invention discloses and a kind ofly produce the method for optical frequency com based on Parabolic Phase modulation, comprise the following steps: the single-frequency light beam that the continuous wave laser of step (1) narrow linewidth sends is by the laggard applying aspect modulator 3 of Polarization Controller; Polarization Controller makes the only same polarization direction by phase-modulator; Step (2) AWG (Arbitrary Waveform Generator) produces Parabolic periodic electric signal; This electric signal is loaded into the radio-frequency (RF) signal input end of phase-modulator after electric amplifier amplifies, and the drive voltage signal be namely loaded on phase-modulator is parabolic type; The frequency of this electric signal comb with light between frequency interval equal, the modulation band-width that can not exceed phase-modulator of maximum cycle electric signal parabolic type width; The light that step (3) exports after phase-modulator is multi-frequency optical.The multifrequency spectrum exported has symmetry all the time.Obtain a kind of special LASER Light Source being different from conventional continuous wave Frequency Stabilized Lasers.
Description
Technical field
The present invention relates to optical communication, optical measurement and optical instrument and manufacture field, be specifically related to a kind of method and apparatus producing optical frequency com based on Parabolic Phase modulation.
Background technology
Light comb is the frequency spectrum having the distribution of a series of frequency-flat, has many application in optical communication and photo measure field.As the wavelength-division multiplex comparatively had superiority in optical-fiber network of future generation (WDM) optical-fiber network and frequency division multiplexing (FDM) optical-fiber network, their usually need tens stable laser instruments as light sources transmit signal, these laser instruments can use stable, a smooth optical frequency com to replace, thus greatly reduce the cost of system; Use the precision that can obtain micron dimension in the measurement of optical frequency com more than hundred meters; Meanwhile, light comb also can be used to manufacture ultra-short Pulse Generator and AWG (Arbitrary Waveform Generator).Different applications has different requirements for the flatness of optical frequency com, and common requirements is that the optical frequency com obtained is smooth, stable, frequency interval is adjustable.The method of general generation optical frequency com has following three kinds: one to be use mode-locked laser, but is difficult in reality produce stable mode locking; Two is use multiple sinusoidal signal to drive phase-modulator, this square law device is simply easy to realize, but multiple parameter need be controlled simultaneously, comprise multiple modulating frequency, multiple phase differential and multiple voltage amplitude, such shortcoming is that the frequency interval directly causing light to be combed cannot be changed flexibly, and for different frequency, there is different responses due to electric amplifier, the electric signal stability that amplification can be made later reduces; Be finally working strength modulator and phase-modulator series connection, this method also can obtain smooth optical frequency com, but system is more complicated, and cost is high and parameter that is that need control is more.
Parabolic Phase modulation can simple at device, be easy to the condition that operates under obtain stable, comb number and the adjustable smooth optical frequency com of frequency interval.
Summary of the invention
The present invention seeks to, for the deficiencies in the prior art, propose a kind of method producing optical frequency com based on Parabolic Phase modulation, provide the equipment realizing the method simultaneously.
Method of the present invention is realized by following steps: the method producing optical frequency com based on Parabolic Phase modulation,
The single-frequency light beam that the continuous wave laser 1 of step (1) narrow linewidth sends is by the laggard applying aspect modulator 3 of Polarization Controller 2.It is all same polarization direction that Polarization Controller makes by the light of phase-modulator, and the light in this direction is subject to the phase-modulation of Parabolic periodic electric signal, and Insertion Loss is low.
Step (2) AWG (Arbitrary Waveform Generator) 4 produces Parabolic periodic electric signal.The frequency of this electric signal comb with light between frequency interval equal, the modulation band-width that can not exceed phase-modulator 3 of maximum cycle electric signal parabolic type width.This electric signal is loaded into the radio-frequency (RF) signal input end of phase-modulator 3 after electric amplifier 5 amplifies; Namely the drive voltage signal be loaded on phase-modulator is parabolic type; Electric signal power after amplification can not exceed the maximum input electric power of phase-modulator.
The light that step (3) exports after phase-modulator 3 is multi-frequency optical.The multifrequency spectrum exported has symmetry all the time.The voltage amplitude of luminous power only with added on phase-modulator 3 of each order frequency of multi-frequency optical is relevant, can obtain smooth optical frequency com by regulating the amplitude of para-curve electric signal.The frequency interval of light comb depends on the bandwidth of phase-modulator and electric amplifier; Namely to comb the interval between each frequency corresponding with the frequency of electric signal for light, the frequency interval of the frequency spectrum that a series of frequency-flat distributes in light just can being regulated to comb by regulating the frequency of para-curve electric signal.
Realize continuous laser source, phase-modulator, AWG (Arbitrary Waveform Generator), electric signal amplifier that the above-mentioned device based on Parabolic Phase modulation generation optical frequency com scheme comprises narrow linewidth.The output terminal of narrow linewidth continuous wave laser is connected with the input end of Polarization Controller; The output terminal of Polarization Controller is connected with the optical signal input of phase-modulator; The output terminal of AWG (Arbitrary Waveform Generator) is connected with the input end of electric signal amplifier; The output terminal of electric signal amplifier is connected with the electric signal input end of phase-modulator.
Beneficial effect of the present invention: the present invention uses Parabolic Phase to modulate the generation achieving optical frequency com.The power of each order frequency of optical frequency com is only relevant with the electrical signal amplitude (depth of modulation) of phase-modulator, by the comb number and the flatness that regulate the electrical signal amplitude be added on phase-modulator just can change light comb.Light comb side frequency between interval change along with the frequency change of electric signal, change electric signal frequency just can synchronous change light comb frequency interval.Method structure of the present invention is simple, be easy to operation, do not use other optical element except phase-modulator.
Device of the present invention is simple, and it is convenient to control, and the frequency comb of generation is at field important in inhibitings such as optical communication, optical measurement and optical instrument manufactures.In optical communications, optical frequency com can be used for multiple LASER Light Source required in the systems such as alternative DWDM, greatly reduces the cost of system, contributes to the realization of optical-fiber network of future generation.According to Fourier transform relation, the waveform change of the corresponding time domain of change of frequency field spectral line, by also obtaining the random waveform of time domain, i.e. the generation of optics random waveform to the precise hard_drawn tuhes of frequency domain spectral line.In addition light comb also can be used for producing ultrashort pulse, for ultra-short Pulse Generator.At field of optical measurements, optical frequency com is as the bridge of microwave frequency and optical frequency, the direct delicate metering to laser frequency can be realized, simultaneously as a kind of special LASER Light Source being different from conventional continuous wave Frequency Stabilized Lasers, there is important application in optical precision measurement fields such as laser frequency scale, absolute distance measurement and precise light spectrometrys.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the cycle parabolic waveform that AWG (Arbitrary Waveform Generator) produces.
Fig. 3 is that 0 rank of output multi-frequency optical are to the relation between 6 rank luminous powers and depth of modulation.
Fig. 4 uses 13 optical frequency coms obtaining of this method, and flatness has 13 within 1.5dB.
Embodiment
See Fig. 1 ~ Fig. 4.As shown in Figure 1, the device realizing such scheme comprises the continuous laser source of narrow linewidth, Polarization Controller, phase-modulator, AWG (Arbitrary Waveform Generator), electric signal amplifier.The output terminal of narrow linewidth continuous wave laser is connected with the input end of Polarization Controller; The output terminal of Polarization Controller is connected with the optical signal input of phase-modulator; The output terminal of AWG (Arbitrary Waveform Generator) is connected with the input end of electric signal amplifier; The output terminal of electric signal amplifier is connected with the electric signal input end of phase-modulator.
Present embodiment is specifically made up of following steps:
The single-frequency light beam that the continuous wave laser 1 of step (1) narrow linewidth sends, by the laggard applying aspect modulator 3 of Polarization Controller 2, regulates Polarization Controller 2 to make to enter the Insertion Loss of the most ambassador's phase-modulator 3 of luminous power of phase-modulator 3 minimum and ensure that input light is all same polarization direction.Narrow cable and wide optical fiber laser refers to that laser exports with the form of the single longitudinal mode of chamber internal vibration, and laser spectrum live width is very narrow, within 100-150nm.
It is Parabolic periodic electric signal that step (2) AWG (Arbitrary Waveform Generator) 4 produces frequency change, as shown in Figure 2.
electricitythe frequency of signal should be less than the modulation band-width of phase-modulator.As used the AWG (Arbitrary Waveform Generator) 81180A of Agilent company, then need to use software benchlink supporting with it could produce this signal.This signal is loaded into the radio-frequency (RF) signal input end of phase-modulator 3 after electric amplifier 5 amplifies, the responsive bandwidth of electric amplifier 5 need meet the frequency needs of electric signal, electric signal power after amplification can not exceed the maximum input electric power of phase-modulator 3, can observe voltage amplitude in advance to avoid damaging phase-modulator on oscillograph.
The light that step (3) exports after phase-modulator 3 is multi-frequency optical.The multi-frequency optical exported has symmetry all the time.The voltage amplitude of luminous power only with added on phase-modulator 3 of each order frequency of multi-frequency optical is relevant, can obtain smooth optical frequency com by regulating the amplitude of electric signal.Interval between light comb side frequency is corresponding with the frequency of electric signal, by the frequency interval regulating the frequency of electric signal that light just can be regulated to comb.Namely the number of light comb and flatness depend on the maximum input electric power of phase-modulator, and the frequency interval of light comb depends on the bandwidth of phase-modulator and electric amplifier.
After Parabolic Phase modulation, single-frequency light becomes multi-frequency optical, and multi-frequency optical electric field expression formula is
.Wherein, E
infor the single-frequency optical electric field of input, f
modfor modulating frequency, i.e. the frequency interval of frequency comb.F
nfor normalized multi-frequency optical each rank amplitude.Formula (1) gives the optical power value of each order frequency of multi-frequency optical:
（1）
Wherein, P
nthe luminous power of the n-th order frequency,
be the depth of modulation of phase-modulator, V is the amplitude of para-curve electric signal, V
πit is the half-wave voltage of phase-modulator.
be error function, it is a kind of odd function, namely has erf (-x)=-erf (x), and the multifrequency spectrum produced as can be seen here is always symmetrical.And the luminous power on the n-th rank is only relevant with depth of modulation, therefore, by regulating electrical signal amplitude just can obtain smooth optical frequency com.
The symmetry of spectrum to the relation between the luminous power and depth of modulation on the 6th rank as shown in Figure 3, is considered in 0th rank of making according to formula (1), and Fig. 3 can represent 13 light combs in fact.As can be seen from the figure, for specific 13 light comb, along with the increasing of depth of modulation, the fluctuation between the luminous power of each rank reduces gradually, and namely light comb is tending towards smooth; Along with the increasing of depth of modulation, the number of light comb also in increase, such as, can be known from figure, is when 3 in depth of modulation, can obtain the light comb of 3 flatnesses within 2dB, can produce 13 light combs when depth of modulation is 13.For 13 the light combs shown in Fig. 3, along with the increase of depth of modulation, the flatness of light comb is totally also improving.Fig. 4 is 13 optical frequency coms using the inventive method to produce, and flatness has 13 within 1.5dB.
Although the present invention with preferred embodiment disclose as above, so itself and be not used to limit the present invention.Persond having ordinary knowledge in the technical field of the present invention, without departing from the spirit and scope of the present invention, when being used for a variety of modifications and variations.Therefore, protection scope of the present invention is when being as the criterion depending on those as defined in claim.
Claims (1)
1. produce a method for optical frequency com based on Parabolic Phase modulation, it is characterized in that the method comprises the following steps:
Step 1) the single-frequency light beam that sends of the continuous wave laser of narrow linewidth is by the laggard applying aspect modulator of Polarization Controller; Polarization Controller makes the only same polarization direction by phase-modulator;
Step 2) AWG (Arbitrary Waveform Generator) produces Parabolic periodic electric signal; This electric signal is loaded into the radio-frequency (RF) signal input end of phase-modulator after electric amplifier amplifies, and the drive voltage signal be namely loaded on phase-modulator is parabolic type; The frequency of this electric signal comb with light between frequency interval equal, the modulation band-width that can not exceed phase-modulator of maximum cycle electric signal parabolic type width;
Step 3) light that exports after phase-modulator is multi-frequency optical; The multifrequency spectrum exported has symmetry all the time; The voltage amplitude of luminous power only with added on phase-modulator of each order frequency of multi-frequency optical is relevant, can obtain smooth optical frequency com by regulating the amplitude of para-curve electric signal; The frequency interval of light comb depends on the bandwidth of phase-modulator and electric amplifier; Namely to comb the interval between each frequency corresponding with the frequency of electric signal for light, the frequency interval of the frequency spectrum that a series of frequency-flat distributes in light just can being regulated to comb by regulating the frequency of para-curve electric signal.
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| CN106802498B (en) * | 2017-03-10 | 2019-08-20 | 西南交通大学 | A kind of all-digital programmable optical frequency comb generation method and device |
| CN108572469B (en) * | 2018-07-20 | 2023-09-26 | 中国人民解放军国防科技大学 | Multi-channel different-frequency-point laser synchronous phase modulation spectrum widening device and method |
| CN111901042B (en) * | 2020-08-11 | 2022-03-11 | 中国电子科技集团公司第四十四研究所 | Phase modulation-based large dynamic signal demodulation model method |
| CN113224622A (en) * | 2021-04-21 | 2021-08-06 | 中国人民解放军国防科技大学 | Communication band high-flatness large-comb-tooth-spacing linear polarization electro-optic modulation optical frequency comb light source |
| CN113791513B (en) * | 2021-08-25 | 2023-04-18 | 山西大学 | Optical frequency comb generation and detection system and method |
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