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 PDFInfo
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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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- 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
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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
- H04B10/508—Pulse generation, e.g. generation of solitons
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- 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
Abstract
The invention discloses a kind of ultralow din-light multi-carrier transmission method of many reference amounts process Mixed cascading, pulse signal caused by light-pulse generator enters photonic crystal fiber, and positive parametric process occurs, generates multiple subcarriers；By generated subcarrier by injecting one section of parameter optical fiber after phase matched, backlight parametric process, signal light power amplification occurs；Amplified signal is detected by ideler frequency Xanthophyll cycle detection module, when ideler frequency light needs to inhibit, is then returned in upper level phase matcher signal, is carried 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.The present invention is by cascading different kinds of parameters process, and 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 relatively stable between carrier wave.
Description
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. a kind of ultralow din-light multi-carrier transmission method of many reference amounts process Mixed cascading, it is characterised in that comprise the steps of:
Step 1: pulse signal caused by light-pulse generator enters photonic crystal fiber, and positive parametric process occurs, generates multiple
Subcarrier；
Step 2: by generated subcarrier by injecting one section of parameter optical fiber after phase matched, reversed optical parameter mistake occurs
Journey, 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 will
Signal returns in upper level phase matcher, carries out reversed parameter amplification again；When ideler frequency light does not need to inhibit, signal
It is directly injected into next stage photonic crystal fiber and continues multicarrier generation, then successive ignition exports.
2. a kind of ultralow din-light multi-carrier transmission method of many reference amounts process Mixed cascading described in accordance with the claim 1, special
Sign is: pulse signal central wavelength caused by light-pulse generator is 1551nm in the step 1, and frequency is 25GHz, light
Spectrum is comb δ function formula, and by EDFA power amplification to 1W.
3. a kind of ultralow din-light multi-carrier transmission method of many reference amounts process Mixed cascading described in accordance with the claim 1, special
Sign is: photonic crystal fiber is 50 meters long in the step 1, is double zero dispersion optical fiber, zero dispersion point be located at 1540nm and
1555nm。
4. a kind of ultralow din-light multi-carrier transmission method of many reference amounts process Mixed cascading described in accordance with the claim 1, special
Sign is: phase matched uses phase matcher in the step 2, and pumping is provided between phase matcher and parameter optical fiber
Light, the wavelength and energy of pump light are respectively 1520nm and 2W, and the optical signal of phase matcher output is coupled to by coupler
On, it is negative dispersion flattened fiber that parameter optical fiber is 30 meters long.
5. a kind of ultralow din-light multi-carrier transmission method of many reference amounts process Mixed cascading described in accordance with the claim 1, special
Sign is: in the step 3,25GHz is divided between successive ignition outgoing carrier, quantity is greater than 50, the positive and negative 1dB of power flatness
Multi-carrier optical signal.
6. a kind of ultralow din-light multi-carrier transmission method of many reference amounts process Mixed cascading described in accordance with the claim 1, special
Sign is: multiple subcarriers generation processes are in the step 1
Positive parametric process occurs in photonic crystal fiber for pulse signal, and the strong incident light of two beam different wave lengths is meeting phase
Under the conditions of position is matched, interaction is caused to produce mixed product on other wavelength, the new spare time is generated on sideband
Frequency light；
Frequency is ω1And ω2Trunk offering ejected wave, when meeting phase-matching condition in a fiber, by generate frequency be ω3And ω4's
Ideler 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 ω4Two
Upper and lower frequency displacement has occurred relative to incident light wave in the frequency of wave, 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 anti-stoke
This band.
7. a kind of ultralow din-light multi-carrier transmission method of many reference amounts process Mixed cascading described in accordance with the claim 1, special
Sign is: 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；Parameter mistake
The efficiency and function sinc of journey2(△ kL/2) is directly proportional, △ k=β in formula3+β4-β1-β2, it is wave vector mismatch, wherein βjFor frequency
For ωjWhen transmission, L is fiber lengths；
Under conditions of phase matched △ k=0, parametric process efficiency highest；And when phase mismatch △ k ≠ 0, parametric process efficiency
It substantially reduces.
8. a kind of ultralow din-light multi-carrier transmission method of many reference amounts process Mixed cascading described in accordance with the claim 1, special
Sign is: 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 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 is not lost in parametric process,
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.
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