CN103513491A - Method and device based on parabola phase modulation for producing optical frequency combs - Google Patents
Method and device based on parabola phase modulation for producing optical frequency combs Download PDFInfo
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Abstract
The invention discloses a method based on parabola phase modulation for producing optical frequency combs. The method comprises the following steps that (1) a single-frequency light beam produced by a continuous laser with a narrow linewidth passes through a polarization controller and then enters a phase modulator 3; the polarization controller enables light passing through the phase modulator to be in the same polarization direction; (2) an arbitrary waveform generator produces periodic electric signals, the electric signals are applied to the radio-frequency signal input end of the phase modulator after being amplified by an electric amplifier, namely, driving voltage signals applied to the phase modulator are in a parabola type, the frequency of each electric signal is equal to frequency intervals between the optical combs, and the parabolic width of the maximum periodic electric signal cannot exceed the modulation bandwidth of the phase modulator; (3) the light output by passing through the phase modulator is multi-frequency light. An output multi-frequency spectrum has symmetry all the time. A special laser light source different from conventional continuous wave frequency stabilized laser light is obtained.
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 based on Parabolic Phase modulation generation optical frequency com.
Background technology
Light comb is to have the equally distributed frequency spectrum of a series of frequencies, in optical communication and photo measure field, has many application.As the wavelength-division multiplex having superiority in optical-fiber network of future generation (WDM) optical-fiber network and frequency division multiplexing (FDM) optical-fiber network, they need tens stable laser instruments as light sources transmit signal conventionally, these laser instruments can replace with stable, a smooth optical frequency com, thereby greatly reduce the cost of system; Use optical frequency com can obtain the precision of micron dimension in more than hundred meters measurements; 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 obtaining is smooth, stable, frequency interval is adjustable.The general method that produces optical frequency com has following three kinds: the one, and use mode-locked laser, but in reality, be difficult to produce stable mode locking; The 2nd, use a plurality of sinusoidal signals to drive phase-modulator, this square law device is simply easy to realize, but need control a plurality of parameters simultaneously, comprise a plurality of modulating frequencies, a plurality of phase differential and a plurality of voltage amplitude, such shortcoming is directly to cause the frequency interval of light comb to change flexibly, and because electric amplifier has different responses for different frequency, can make to amplify later electric signal stability and reduce; 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 parameter high and that need to control is more.
Parabolic Phase modulation can be simple at device, it is stable to obtain under the condition of easy operating, broach 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 based on Parabolic Phase modulation generation optical frequency com, the equipment of realizing the method is provided simultaneously.
Method of the present invention is realized by following steps: based on Parabolic Phase, modulation produces the method for optical frequency com,
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 the light by phase-modulator, and the light of 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 equates with the frequency interval between light comb, the modulation band-width that can not surpass 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; The drive voltage signal being loaded on phase-modulator is parabolic type; Electric signal power after amplification can not surpass the maximum input electric power of phase-modulator.
The light that step (3) is exported after phase-modulator 3 is multifrequency light.The multifrequency spectrum of output has symmetry all the time.The luminous power of each order frequency of multifrequency light is only relevant with added voltage amplitude on phase-modulator 3, by regulating the amplitude of para-curve electric signal can obtain smooth optical frequency com.The frequency interval of light comb depends on the bandwidth of phase-modulator and electric amplifier; Be that the light interval of combing between each frequency is corresponding with the frequency of electric signal, by regulate the frequency of para-curve electric signal just can regulate light comb in the frequency interval of the equally distributed frequency spectrum of a series of frequencies.
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 light signal input end 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 modulation to realize the generation of 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, and the electrical signal amplitude being added on phase-modulator by adjusting just can change broach number and the flatness that light is combed.Interval between light comb side frequency changes along with the frequency change of electric signal, the frequency interval that the frequency that changes electric signal just can synchronous change light be combed.Method of the present invention is simple in structure, easy operating, does 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 communication, optical frequency com can be used for substituting required a plurality of LASER Light Source in the systems such as DWDM, greatly reduces the cost of system, contributes to the realization of optical-fiber network of future generation.According to Fourier transform relation, the wave form varies of the corresponding time domain of the variation of frequency field spectral line, is controlled and also can be obtained the random waveform of time domain, i.e. the generation of optics random waveform by the precision to frequency domain spectral line.In addition light comb also can be used for producing ultrashort pulse, for ultra-short Pulse Generator.In optical measurement field, optical frequency com is as the bridge of microwave frequency and optical frequency, can realize the direct delicate metering to laser frequency, as a kind of special LASER Light Source that is different from traditional continuous wave Frequency Stabilized Lasers, in optical precision measurement fields such as laser frequency scale, absolute distance measurement and precise light spectrometrys, there is important application simultaneously.
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.
0 rank that Fig. 3 is output multifrequency light are to the relation between 6 rank luminous powers and depth of modulation.
13 optical frequency coms of Fig. 4 for using this method to obtain, flatness at 1.5dB with interior have 13.
Embodiment
Referring to Fig. 1～Fig. 4.As shown in Figure 1, the device of realizing such scheme comprises continuous laser source, Polarization Controller, phase-modulator, AWG (Arbitrary Waveform Generator), the electric signal amplifier of 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 light signal input end 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 comprised of following steps:
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, regulates Polarization Controller 2 to make to enter the Insertion Loss of the ambassador's phase-modulator 3 of luminous power of phase-modulator 3 minimum and guarantee that input light is all same polarization direction.Narrow cable and wide optical fiber laser refers to that laser is with the formal output of the single longitudinal mode of chamber internal vibration, and laser spectrum live width is very narrow, in 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 use the AWG (Arbitrary Waveform Generator) 81180A of Agilent company, need to use supporting with it software benchlink 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 surpass the maximum input electric power of phase-modulator 3, can on oscillograph, observe voltage amplitude in advance to avoid damaging phase-modulator.
The light that step (3) is exported after phase-modulator 3 is multifrequency light.The multifrequency light of output has symmetry all the time.The luminous power of each order frequency of multifrequency light is only relevant with added voltage amplitude on phase-modulator 3, by regulating the amplitude of electric signal can obtain smooth optical frequency com.Interval between light comb side frequency is corresponding with the frequency of electric signal, by regulating the frequency of electric signal just can regulate the frequency interval of light comb.Be the number of light comb and the maximum input electric power that flatness depends on phase-modulator, the frequency interval of light comb depends on the bandwidth of phase-modulator and electric amplifier.
After Parabolic Phase modulation, single-frequency light has become multifrequency light, and multifrequency 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 multifrequency Guang Ge rank amplitude.Formula (1) has provided the optical power value of each order frequency of multifrequency light:
（1）
Wherein, P
nthe luminous power of n 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, has erf (x)=-erf (x), and the multifrequency spectrum producing is as can be seen here always symmetrical.And the luminous power on n rank is only relevant with depth of modulation, therefore, by regulating electrical signal amplitude just can obtain smooth optical frequency com.
The luminous power on 6 rank, the 0th rank to the of making according to formula (1) and the relation between depth of modulation as shown in Figure 3, are considered the symmetry of spectrum, 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 fluctuation between the increasing ，Ge rank luminous power of depth of modulation reduces gradually, light comb is tending towards smooth; Along with the increasing of depth of modulation, the number of light comb also increasing, for example, can be known from figure, when depth of modulation is 3, can obtains 3 flatnesses and comb with interior light at 2dB, and in depth of modulation, be to produce 13 light combs at 13 o'clock.For 13 light combs that show 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 that use the inventive method to produce, flatness at 1.5dB with interior have 13.
Although the present invention discloses as above with preferred embodiment, so it is not in order 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 claims person of defining.
Claims (3)
1. based on Parabolic Phase, modulate a method that produces optical frequency com, it is characterized in that the method comprises 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 being loaded on phase-modulator is parabolic type; The frequency of this electric signal equates with the frequency interval between light comb, the modulation band-width that can not surpass phase-modulator of maximum cycle electric signal parabolic type width;
The light that step (3) is exported after phase-modulator is multifrequency light.The multifrequency spectrum of output has symmetry all the time.The luminous power of each order frequency of multifrequency light is only relevant with added voltage amplitude on phase-modulator, by regulating the amplitude of para-curve electric signal can obtain smooth optical frequency com;
The frequency interval of light comb depends on the bandwidth of phase-modulator and electric amplifier; Be that the light interval of combing between each frequency is corresponding with the frequency of electric signal, by regulate the frequency of para-curve electric signal just can regulate light comb in the frequency interval of the equally distributed frequency spectrum of a series of frequencies.
2. the method based on Parabolic Phase modulation generation optical frequency com as claimed in claim 1, is characterized in that, by regulating the amplitude of para-curve electric signal to obtain smooth optical frequency com.
3. produce as claimed in claim 1 the device of flat optical frequency com, the continuous laser source, phase-modulator, AWG (Arbitrary Waveform Generator), the electric signal amplifier that comprise narrow linewidth, is characterized in that: 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 light signal input end 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.
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| CN106802498A (en) * | 2017-03-10 | 2017-06-06 | 西南交通大学 | A kind of all-digital programmable optical frequency comb generation method and device |
| CN108572469A (en) * | 2018-07-20 | 2018-09-25 | 中国人民解放军国防科技大学 | Multi-channel different frequency point laser synchronous phase modulation spectrum broadening device and method |
| CN111901042A (en) * | 2020-08-11 | 2020-11-06 | 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 |
| CN113791513A (en) * | 2021-08-25 | 2021-12-14 | 山西大学 | Optical frequency comb generation and detection system and method |
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| CN108572469A (en) * | 2018-07-20 | 2018-09-25 | 中国人民解放军国防科技大学 | Multi-channel different frequency point laser synchronous phase modulation spectrum broadening device and method |
| 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 |
| CN111901042A (en) * | 2020-08-11 | 2020-11-06 | 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 |
| 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 |
| CN113791513A (en) * | 2021-08-25 | 2021-12-14 | 山西大学 | Optical frequency comb generation and detection system and method |
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