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CN109525322A - A kind of ultralow din-light multi-carrier transmission method of many reference amounts process Mixed cascading - Google Patents

A kind of ultralow din-light multi-carrier transmission method of many reference amounts process Mixed cascading Download PDF

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CN109525322A
CN109525322A CN201811299228.XA CN201811299228A CN109525322A CN 109525322 A CN109525322 A CN 109525322A CN 201811299228 A CN201811299228 A CN 201811299228A CN 109525322 A CN109525322 A CN 109525322A
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frequency
parametric
fiber
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CN109525322B (en
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刘博�
张丽佳
毛雅亚
忻向军
孙婷婷
赵立龙
吴泳锋
刘少鹏
宋真真
王俊锋
哈特
姜蕾
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Nanjing University of Information Science and Technology
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/503—Laser transmitters
    • H04B10/505—Laser transmitters using external modulation
    • H04B10/5051—Laser transmitters using external modulation using a series, i.e. cascade, combination of modulators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/508—Pulse generation, e.g. generation of solitons
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0202—Arrangements therefor
    • H04J14/0209—Multi-stage arrangements, e.g. by cascading multiplexers or demultiplexers

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

本发明公开了一种多参量过程混合级联的超低噪光多载波发射方法，脉冲光源所产生的脉冲信号进入光子晶体光纤，发生正向参量过程，产生多个子载波；将所产生的子载波经过相位匹配之后注入一段参量光纤，发生反向光参量过程，信号光功率放大；放大后的信号通过闲频光抑制检测模块进行检测，当闲频光需要抑制时，则将信号返回到上一级相位匹配器中，再一次进行反向参量放大；当闲频光不需要抑制时，信号直接注入到下一级光子晶体光纤继续进行多载波生成，然后多次迭代输出。本发明通过将多种参量过程进行级联，应用于多载波的产生，产生的光源载波数更多，载噪比更低，并且载波之间频率相对稳定。

The invention discloses a multi-parameter process hybrid cascaded ultra-low noise optical multi-carrier transmission method. A pulse signal generated by a pulsed light source enters a photonic crystal fiber, a forward parameter process occurs, and multiple sub-carriers are generated; After phase matching, the carrier is injected into a parametric fiber, and the reverse optical parametric process occurs, and the signal optical power is amplified; the amplified signal is detected by the idler light suppression detection module. When the idler light needs to be suppressed, the signal is returned to the upper In the first-stage phase matcher, reverse parametric amplification is performed again; when the idler light does not need to be suppressed, the signal is directly injected into the next-stage photonic crystal fiber to continue multi-carrier generation, and then iteratively output. The invention is applied to the generation of multi-carriers by cascading various parameter processes, the generated light source carriers have more numbers, the carrier-to-noise ratio is lower, and the frequencies between the carriers are relatively stable.

Description

A kind of ultralow din-light multi-carrier transmission method of many reference amounts process Mixed cascading
Technical field
The present invention relates to a kind of smooth multi-carrier transmission method, especially a kind of ultralow din-light of many reference amounts process Mixed cascading Multi-carrier transmission method.
Background technique
With the fast development of the business such as cloud computing, mobile Internet, big data, demand of the people to network bandwidth is in finger Several levels increase.Hyper channel is the basis for constructing the following spectral efficient large capacity optical communication system, either in standard single mode In single system or in SDM system, it is directed to the key technology of hyperchannel system.The use of multicarrier light source can It is the important component for constructing hyper channel system to largely reduce number of lasers needed for hyperchannel system.Due to There is no relative frequency drift between subcarrier, protection interval can be completely removed, such system can achieve higher frequency spectrum effect Rate.In addition, using frequency or PGC demodulation multicarrier light source, it can be equal into united DSP between the receiver of multiple synchronizations Weighing apparatus, such as phase noise, compensating for frequency offset and non-linear estimations, can obtain better portfolio effect.
Currently, mainly being included the following three types using the scheme that single laser generates multi-carrier light both at home and abroad: based on circulation frequency It moves device and generates scheme, the raw scheme of more modulator stage coproduction and based on four-wave mixing effect scheme in high non-linearity medium.It is based on Light source wavelet number caused by circulation frequency shifter is relatively more and can regulate and control, and frequency interval is adjustable, and carrier wave flatness is preferable, but lacks Point is that carrier wave stability is poor, and carrier-to-noise ratio is relatively low.Realize that structure is more complex based on the raw scheme of more modulator stage coproduction, modulation Device is at high cost, and the number of subcarriers of generation is limited, and carrier wave flatness is lower.Multicarrier light source based on four-wave mixing effect Although structure is simple, while carrier number increases, power can be gradually decreased, when power is lower than four-wave mixing threshold value When, it can not just cascade and further excite new carrier wave, therefore generated number of carrier wave is limited.Using EDFA Erbium-Doped Fiber Amplifier pair Although can amplify with sub-carrier, then proceed to excite new carrier wave with four-wave mixing effect, this amplification side The noise that formula generates is more, causes generated light source carrier-to-noise ratio too low.Therefore, generating ultralow din-light multicarrier source is to compel at present Cut problem to be solved.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of ultralow din-light multicarriers of many reference amounts process Mixed cascading Launching technique.
In order to solve the above technical problems, the technical scheme adopted by the invention is that:
A kind of ultralow din-light multi-carrier transmission method of many reference amounts process Mixed cascading, it is characterised in that include following step It is rapid:
Step 1: pulse signal caused by light-pulse generator enters photonic crystal fiber, and positive parametric process occurs, generates Multiple subcarriers；
Step 2: by generated subcarrier by injecting one section of parameter optical fiber after phase matched, reversed beche-de-mer without spike occurs Amount process, signal light power amplification；
Step 3: amplified signal is detected by ideler frequency Xanthophyll cycle detection module, when ideler frequency light needs to inhibit, Then signal is returned in upper level phase matcher, carries out reversed parameter amplification again；When ideler frequency light does not need to inhibit, Signal is directly injected into next stage photonic crystal fiber and continues multicarrier generation, and then successive ignition exports.
Further, pulse signal central wavelength caused by light-pulse generator is 1551nm in the step 1, and frequency is 25GHz, spectrum are comb δ function formula, and by EDFA power amplification to 1W.
Further, photonic crystal fiber is 50 meters long in the step 1, is double zero dispersion optical fiber, zero dispersion point is located at 1540nm and 1555nm.
Further, phase matched uses phase matcher in the step 2, between phase matcher and parameter optical fiber It is provided with pump light, the wavelength and energy of pump light are respectively 1520nm and 2W, and it is defeated to be coupled to phase matcher by coupler On optical signal out, it is negative dispersion flattened fiber that parameter optical fiber is 30 meters long.
Further, in the step 3,25GHz is divided between successive ignition outgoing carrier, quantity is greater than 50, and power is flat Spend the multi-carrier optical signal of positive and negative 1dB.
Further, multiple subcarriers generation processes are in the step 1
Positive parametric process, the strong incident light of two beam different wave lengths, full occur in photonic crystal fiber for pulse signal Under conditions of sufficient phase matched, interaction is caused to produce mixed product on other wavelength, be generated on sideband new Ideler frequency light；
Frequency is ω1And ω2Trunk offering ejected wave, when meeting phase-matching condition in a fiber, by generate frequency be ω3With ω4Ideler frequency light, incident light and generated ideler frequency light frequency will meet following relationship:
ω3+ω4=ω1+ω2
Positive parametric process is frequencies omega1And ω2Strong incident light wave energy transfer give newly generated frequencies omega3And ω4 Upper and lower frequency displacement has occurred relative to incident light wave in the frequency of two waves, newly generated wave, and frequency shift amount is by formula Ωs=ω1- ω3=ω4-ω2It provides；
It is assumed that ω3<ω4, it is located at ω3The low-frequency band at place and be located at ω4The high frequency band at place is also referred to as Stokes band and instead this Lentor band.
Further, phase matched process is in the step 2
Only when two beam incident light waves meet phase-matching condition in a fiber, parametric process could effectively occur；Ginseng The efficiency and function sinc of amount process2(Δ kL/2) is directly proportional, Δ k=β in formula3+β4-β1-β2, it is wave vector mismatch, wherein βjFor Frequency is ωjWhen transmission, L is fiber lengths；
Under conditions of phase matched Δ k=0, parametric process efficiency highest；And when phase mismatch Δ k ≠ 0, parametric process Efficiency substantially reduces.
Further, reversed parametric amplification is in the step 3
Frequency is ω3Weak signal and frequency be ω1Trunk offering ejected wave is injected into optical fiber together, and when phase matched, then frequency Rate is ω3Weak signal will be amplified, while generate frequency be ω4Ideler frequency wave；
Assuming that ω1The power of pump light is ω much larger than frequency3Weak signal, and pump power does not have in parametric process Loss, if phase strictly matches, the gain amplifier of signal are as follows:
Wherein, PpFor pumping light power, γ is nonlinear factor, and L is fiber lengths.
Compared with prior art, the present invention having the following advantages that and effect: the present invention is by carrying out different kinds of parameters process Cascade, applied to the generation of multicarrier, the light source carrier number of generation is more, and carrier-to-noise ratio is lower, and frequency is opposite between carrier wave Stablize.The multicarrier light source can provide many wavelength not equal light carrier, and spectral line interval and number of carrier wave for wdm system It is flexibly adjustable.Each subcarrier carries high speed signal respectively, and using order vectors modulation format etc., list can be significantly increased Channel transfer capability.The use of this light source can greatly reduce the quantity of laser, save system cost.
Detailed description of the invention
Fig. 1 is a kind of flow chart of the ultralow din-light multi-carrier transmission method of many reference amounts process Mixed cascading of the invention.
Fig. 2 is a kind of system structure of the ultralow din-light multi-carrier transmission method of many reference amounts process Mixed cascading of the invention Figure.
Fig. 3 is that the ideler frequency light of the embodiment of the present invention generates schematic diagram.
Fig. 4 is the parametric process efficiency of the embodiment of the present invention with the variation schematic diagram of phase mismatch Δ k.
Fig. 5 is the signal light enlarged diagram of the embodiment of the present invention.
Fig. 6 is the spectrogram received of the embodiment of the present invention.
Specific embodiment
The present invention is described in further detail by way of example and in conjunction with the accompanying drawings, and following embodiment is to this hair Bright explanation and the invention is not limited to following embodiments.
As shown in Figure 1, a kind of ultralow din-light multi-carrier transmission method of many reference amounts process Mixed cascading of the invention, includes Following steps:
Step 1: pulse signal caused by light-pulse generator enters photonic crystal fiber, and positive parametric process occurs, generates Multiple subcarriers；System component mainly includes with lower module: light-pulse generator, photonic crystal fiber, phase matcher, parameter amplification Optical fiber, the detection of ideler frequency Xanthophyll cycle.Pulse signal central wavelength caused by light-pulse generator is 1551nm, and frequency is 25GHz, light Spectrum is comb δ function formula, and by EDFA (erbium-doped fiber amplifier) power amplification to 1W.Photonic crystal fiber is 50 meters long, is double Zero dispersion optical fiber, zero dispersion point are located at 1540nm and 1555nm.
Multiple subcarriers generate process
Positive parametric process, the strong incident light of two beam different wave lengths, full occur in photonic crystal fiber for pulse signal Under conditions of sufficient phase matched, interaction is caused to produce mixed product on other wavelength, be generated on sideband new Ideler frequency light；
As shown in figure 3, frequency is ω1And ω2Trunk offering ejected wave, when meeting phase-matching condition in a fiber, will generate frequency Rate is ω3And ω4Ideler frequency light, incident light and generated ideler frequency light frequency will meet following relationship:
ω3+ω4=ω1+ω2
Positive parametric process is frequencies omega1And ω2Strong incident light wave energy transfer give newly generated frequencies omega3And ω4 Upper and lower frequency displacement has occurred relative to incident light wave in the frequency of two waves, newly generated wave, and frequency shift amount is by formula Ωs=ω1- ω3=ω4-ω2It provides；
It is assumed that ω3<ω4, it is located at ω3The low-frequency band at place and be located at ω4The high frequency band at place is also referred to as Stokes band and instead this Lentor band.
Step 2: by generated subcarrier by injecting one section of parameter optical fiber after phase matched, reversed beche-de-mer without spike occurs Amount process, signal light power amplification；Phase matched uses phase matcher, and pump is provided between phase matcher and parameter optical fiber Pu light, the wavelength and energy of pump light are respectively 1520nm and 2W, are believed by the light that coupler is coupled to phase matcher output On number, it is negative dispersion flattened fiber that parameter optical fiber is 30 meters long.As shown in Fig. 2, incident optical signal is by EDFA power amplification to 1W Afterwards, into first order hybrid parameter procedures system.The system is by one section of photonic crystal fiber, phase matcher, pump light and one Section parametric process is constituted.In this primary system, signal is injected into photonic crystal fiber, and positive parametric process, carrier number occurs Mesh increases, and then signal carries out phase matched by phase matcher, and coupling is injected into parameter optical fiber together with pump light, occurs Reversed parametric process, signal light power increase.Likewise, signal enters photonic crystal during the hybrid parameter of the second level Forward and reverse parametric process also has occurred in optical fiber and parameter optical fiber respectively.
Phase matched process is
Only when two beam incident light waves meet phase-matching condition in a fiber, parametric process could effectively occur；Ginseng The efficiency and function sinc of amount process2(Δ kL/2) is directly proportional, Δ k=β in formula3+β4-β1-β2, it is wave vector mismatch, wherein βjFor Frequency is ωjWhen transmission, L is fiber lengths；
Under conditions of phase matched Δ k=0, parametric process efficiency highest；And when phase mismatch Δ k ≠ 0, parametric process Efficiency substantially reduces.(a) show the obtained parametric process efficiency of simulation with the variation relation of Δ kL/2, in Fig. 4 in Fig. 4 (b) be different Δ k when, parametric process efficiency with L changing rule.
Step 3: amplified signal is detected by ideler frequency Xanthophyll cycle detection module, when ideler frequency light needs to inhibit, Then signal is returned in upper level phase matcher, carries out reversed parameter amplification again；When ideler frequency light does not need to inhibit, Signal is directly injected into next stage photonic crystal fiber and continues multicarrier generation, and then successive ignition exports.
25GHz is divided between successive ignition outgoing carrier, quantity is greater than 50, and the multi-carrier light of the positive and negative 1dB of power flatness is believed Number.
Reversely parametric amplification is
As shown in figure 5, frequency is ω3Weak signal and frequency be ω1Trunk offering ejected wave is injected into optical fiber together, and phase When matching, then frequency is ω3Weak signal will be amplified, while generate frequency be ω4Ideler frequency wave；
Assuming that ω1The power of pump light is ω much larger than frequency3Weak signal, and pump power does not have in parametric process Loss, if phase strictly matches, the gain amplifier of signal are as follows:
Wherein, PpFor pumping light power, γ is nonlinear factor, and L is fiber lengths.
This amplification module response time is fast, has high gain, highest signal gain of light Da to 70dB, noise is very low, does not have There are amplified spontaneous emission (ASE) noise of conventional laser gain media, and broader bandwidth, up to 200nm, it can be achieved that multichannel is believed It number simultaneously amplifies.
As shown in fig. 6, emulation generates the spectrogram of obtained ultralow din-light multicarrier, wherein carried shown in (a) in Fig. 6 Wave spacing is 12.5GHz, and carrier number 80, controlling two figures to be is global figure and part detail view respectively.In Fig. 6 shown in (b) The obtained multicarrier of simulation, from 192THz to 196THz and from 186THz to 190THz in the range of have carrier wave covering. Above simulation results show the feasibility of a kind of ultralow din-light multi-carrier transmission method of many reference amounts process Mixed cascading and excellent Good characteristic.
Above content is only illustrations made for the present invention described in this specification.Technology belonging to the present invention The technical staff in field can do various modifications or supplement or is substituted in a similar manner to described specific embodiment, only It should belong to guarantor of the invention without departing from the content or beyond the scope defined by this claim of description of the invention Protect range.

Claims (8)

1.一种多参量过程混合级联的超低噪光多载波发射方法，其特征在于包含以下步骤：1. a multi-parameter process hybrid cascaded ultra-low-noise optical multi-carrier transmission method is characterized in that comprising the following steps: 步骤一：脉冲光源所产生的脉冲信号进入光子晶体光纤，发生正向参量过程，产生多个子载波；Step 1: The pulse signal generated by the pulse light source enters the photonic crystal fiber, and a forward parameter process occurs, generating multiple sub-carriers; 步骤二：将所产生的子载波经过相位匹配之后注入一段参量光纤，发生反向光参量过程，信号光功率放大；Step 2: inject the generated sub-carrier into a parametric fiber after phase matching, a reverse optical parametric process occurs, and the signal optical power is amplified; 步骤三：放大后的信号通过闲频光抑制检测模块进行检测，当闲频光需要抑制时，则将信号返回到上一级相位匹配器中，再一次进行反向参量放大；当闲频光不需要抑制时，信号直接注入到下一级光子晶体光纤继续进行多载波生成，然后多次迭代输出。Step 3: The amplified signal is detected by the idler light suppression detection module. When the idler light needs to be suppressed, the signal is returned to the previous phase matcher, and reverse parametric amplification is performed again; When no suppression is needed, the signal is directly injected into the next-stage photonic crystal fiber to continue multi-carrier generation, and then output iteratively for many times. 2.按照权利要求1所述的一种多参量过程混合级联的超低噪光多载波发射方法，其特征在于：所述步骤一中脉冲光源所产生的脉冲信号中心波长是1551nm，频率是25GHz，其光谱为梳状光谱，并且经过EDFA功率放大到1W。2. according to the ultra-low-noise optical multi-carrier emission method of a kind of multi-parameter process hybrid cascade according to claim 1, it is characterized in that: in the described step 1, the pulse signal center wavelength generated by the pulsed light source is 1551 nm, and the frequency is 1551 nm. 25GHz, its spectrum is comb spectrum, and it is amplified to 1W by EDFA. 3.按照权利要求1所述的一种多参量过程混合级联的超低噪光多载波发射方法，其特征在于：所述步骤一中光子晶体光纤长50米，是双零色散光纤，零色散点位于1540nm与1555nm。3. according to a kind of multi-parameter process hybrid cascaded ultra-low-noise optical multi-carrier launch method according to claim 1, it is characterized in that: in the described step 1, the photonic crystal fiber is 50 meters long, is a double zero dispersion fiber, and has zero dispersion. The dispersion points are located at 1540nm and 1555nm. 4.按照权利要求1所述的一种多参量过程混合级联的超低噪光多载波发射方法，其特征在于：所述步骤二中相位匹配采用相位匹配器，相位匹配器和参量光纤之间设置有泵浦光，泵浦光的波长和能量分别为1520nm和2W，通过耦合器耦合到相位匹配器输出的光信号上，参量光纤长30米，是负色散平坦光纤。4. according to the ultra-low-noise optical multi-carrier transmitting method of a kind of multi-parameter process hybrid cascade according to claim 1, it is characterized in that: in the described step 2, the phase matching adopts a phase matcher, and the phase matcher and the parametric fiber are between the phase matcher. There is a pump light between the two, and the wavelength and energy of the pump light are 1520nm and 2W respectively. It is coupled to the optical signal output by the phase matcher through the coupler. The parametric fiber is 30 meters long and is a negative dispersion flat fiber. 5.按照权利要求1所述的一种多参量过程混合级联的超低噪光多载波发射方法，其特征在于：所述步骤三中，多次迭代输出载波间隔为25GHz，数量大于50，功率平坦度正负1dB的多载波光信号。5. The ultra-low-noise optical multi-carrier transmission method of a multi-parameter process hybrid cascade according to claim 1, characterized in that: in the step 3, the multiple iteration output carrier interval is 25 GHz, and the number is greater than 50, A multi-carrier optical signal with a power flatness of plus or minus 1dB. 6.按照权利要求1所述的一种多参量过程混合级联的超低噪光多载波发射方法，其特征在于：所述步骤一中多个子载波产生过程为6. The ultra-low-noise optical multi-carrier transmission method of a multi-parameter process hybrid cascade according to claim 1, characterized in that: in the step 1, the multiple sub-carrier generation processes are as follows: 脉冲信号在光子晶体光纤中发生正向参量过程，两束不同波长的强入射光，在满足相位匹配的条件下，将相互作用而导致在其他波长上产生了混频产物，在边带上产生新的闲频光；The pulse signal undergoes a forward parametric process in the photonic crystal fiber. Two beams of strong incident light with different wavelengths will interact under the condition of phase matching, resulting in the generation of frequency mixing products at other wavelengths, which are generated in the sidebands. new idler light; 频率为ω1和ω2的强入射波，在光纤中满足相位匹配条件时，将产生频率为ω3和ω4的闲频光，入射光与所产生的闲频光频率将满足如下关系：The strong incident waves with frequencies of ω 1 and ω 2 will generate idler light with frequencies of ω 3 and ω 4 when the phase matching condition is satisfied in the fiber, and the frequency of the incident light and the generated idler light will satisfy the following relationship: ω3+ω4＝ω1+ω2 ω 3 +ω 4 =ω 1 +ω 2 正向参量过程把频率ω1和ω2的强入射光波的能量转移给新产生的频率ω3和ω4两个波，新产生的波的频率相对于入射光波发生了上、下频移，其频移量由式子Ωs＝ω1-ω3＝ω4-ω2给出；The forward parametric process transfers the energy of the strong incident light waves with frequencies ω 1 and ω 2 to the newly generated two waves with frequencies ω 3 and ω 4 , and the frequencies of the newly generated waves are shifted up and down relative to the incident light waves, Its frequency shift is given by the formula Ω s =ω 1 -ω 3 =ω 4 -ω 2 ; 假定ω3<ω4，位于ω3处的低频带和位于ω4处的高频带也称为斯托克斯带和反斯托克斯带。Assuming ω 3 <ω 4 , the low frequency band at ω 3 and the high frequency band at ω 4 are also called Stokes and anti-Stokes bands. 7.按照权利要求1所述的一种多参量过程混合级联的超低噪光多载波发射方法，其特征在于：所述步骤二中相位匹配过程为7. The ultra-low-noise optical multi-carrier transmission method of a multi-parameter process hybrid cascade according to claim 1, wherein the phase matching process in the step 2 is: 只有当两束入射光波在光纤中满足相位匹配条件时，才能有效发生参量过程；参量过程的效率与函数sinc2(△kL/2)成正比，式中△k＝β3+β4-β1-β2，为波矢失配，其中βj为频率为ωj时的传输常数，L为光纤长度；The parametric process can effectively occur only when the two incident light waves meet the phase matching conditions in the fiber; the efficiency of the parametric process is proportional to the function sinc 2 (△kL/2), where △k=β 3 +β 4 -β 1 -β 2 , is the wave vector mismatch, where β j is the transmission constant when the frequency is ω j , and L is the fiber length; 在相位匹配△k＝0的条件下，参量过程效率最高；而相位失配△k≠0时，参量过程效率大大降低。Under the condition of phase matching Δk=0, the parametric process efficiency is the highest; while when the phase mismatch Δk≠0, the parametric process efficiency is greatly reduced. 8.按照权利要求1所述的一种多参量过程混合级联的超低噪光多载波发射方法，其特征在于：所述步骤三中反向参量放大过程为8. The ultra-low-noise optical multi-carrier transmission method of a multi-parameter process hybrid cascade according to claim 1, characterized in that: in the step 3, the reverse parametric amplification process is: 频率为ω3的弱信号和频率为ω1强入射波一起注入到光纤中，且相位匹配时，则频率为ω3的弱信号将被放大，同时产生频率为ω4的闲频波； The weak signal with frequency ω3 and the strong incident wave with frequency ω1 are injected into the fiber together, and when the phases are matched, the weak signal with frequency ω3 will be amplified, and an idler wave with frequency ω4 will be generated at the same time; 假设ω1泵浦光的功率远大于频率为ω3的弱信号，且在参量过程中泵浦功率没有损耗，若相位严格匹配，信号的放大增益为：Assuming that the power of the pump light of ω 1 is much larger than the weak signal of frequency ω 3 , and the pump power is not lost in the parametric process, if the phases are strictly matched, the amplification gain of the signal is: 其中，Pp为泵浦光功率，γ为非线性系数，L为光纤长度。Among them, P p is the pump light power, γ is the nonlinear coefficient, and L is the fiber length.
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