CN104901742B - A kind of method and system for realizing flashlight Spectral integration - Google Patents
A kind of method and system for realizing flashlight Spectral integration Download PDFInfo
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- CN104901742B CN104901742B CN201510341564.6A CN201510341564A CN104901742B CN 104901742 B CN104901742 B CN 104901742B CN 201510341564 A CN201510341564 A CN 201510341564A CN 104901742 B CN104901742 B CN 104901742B
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Abstract
The invention discloses a kind of method and system for realizing flashlight Spectral integration, this method includes：After the first flashlight and the first coupling pump light, send into the first nonlinear dielectric optical fiber；It is first wave length by the wavelength convert of the first flashlight through four-wave mixing effect in the first nonlinear dielectric optical fiber；The signal of first wave length is extracted as ideler frequency light；After using the ideler frequency light as secondary signal light, with the second coupling pump light, send into the second nonlinear dielectric optical fiber；It is second wave length by the wavelength convert of the secondary signal light through four-wave mixing effect in the second nonlinear dielectric optical fiber；The signal of the second wave length is extracted as output light.The method and system provided by the present invention for realizing flashlight Spectral integration, eliminate the influence of " electronic bottleneck " effect, it is transparent to signal rate and form, there is high conversion efficiency, and the phase conjugation problem brought without interval wavelength convert and elimination four-wave mixing effect can be completed.
Description
Technical field
The present invention relates to technical field of optical fiber communication, and signal in flexible grating elastic optical network is realized more particularly to one kind
The method and system that optical spectrum is integrated.
Background technology
Relative to traditional WDM optical-fiber networks, the elastic optical network based on OFDM technology has many advantages.OFDM technology is by height
Fast converting serial data streams are transmitted into low-speed parallel sub-data flow, extend symbol period, improve antijamming capability, son
Interchannel is mutually orthogonal, improves the availability of frequency spectrum, and its frequency spectrum is flexible and the inherent characteristic of scalability.Therefore,
OFDM optical-fiber networks most distinguishing feature is exactly that spectrum grid is smaller and flexible, can be according to frequency spectrum needed for user's request distribution.But this
Kind of optical network structure has that serious frequency spectrum is discontinuous, and fragmentation problem is, it is necessary to which Spectral integration technology goes solve this problem.
What Spectral integration can carry out frequency spectrum redistributes utilization, reaches and improves the availability of frequency spectrum, solves interconnection
The competition of journey medium wavelength, carry out effective routing selection and reduce network blocking probability problem.
The wavelength shifter of existing optical-electrical-optical Wavelength transformational structure, it needs to use electronic device part, due to " electronics
The limitation of bottleneck ", switching rate is relatively low, opaque to signal rate；The phase and amplitude of original signal is believed in transfer process
Breath can not retain, opaque to format modulation signal.And in single-stage AOWC structure, between pump light and wavelength light
There is a wavelength interval, therefore can not realize that any of ofdm signal is moved.
The content of the invention
It is an object of the invention to provide a kind of method and system realized signal spectrum and integrated, it is therefore intended that eliminates existing
" electronic bottleneck " effects and solution single-stage AOWC can not be realized to signal in optical-electrical-optical transformational structure
Any the problem of moving.
In order to solve the above technical problems, the present invention provides a kind of method for realizing flashlight Spectral integration, including：
After the first flashlight and the first coupling pump light, send into the first nonlinear dielectric optical fiber；
Through four-wave mixing effect in the first nonlinear dielectric optical fiber, the wavelength convert by first flashlight is
First wave length；
The signal of the first wave length is extracted as ideler frequency light；
After using the ideler frequency light as secondary signal light, with the second coupling pump light, send to the second nonlinear dielectric light
In fibre；
Through four-wave mixing effect in the second nonlinear dielectric optical fiber, the wavelength convert by the secondary signal light is
Second wave length；
The signal of the second wave length is extracted as output light.
Alternatively, the first nonlinear dielectric optical fiber is highly nonlinear optical fiber.
Alternatively, the second nonlinear dielectric optical fiber is highly nonlinear optical fiber.
Alternatively, first flashlight is coherent light orthogonal frequency-division multiplex singal light.
Alternatively, first pump light is continuous light.
Alternatively, the input power of first flashlight is 9.1dBm, and the input power of first pump light is
27.9dBm。
Alternatively, the input power of the secondary signal light is 7.9dBm, and the input power of second pump light is
22.3dBm。
Present invention also offers a kind of system for realizing flashlight Spectral integration, including：
First coupler, for by after the first flashlight and the first coupling pump light, sending to the first nonlinear dielectric
In optical fiber；
First nonlinear dielectric optical fiber, it is the by the wavelength convert of first flashlight for through four-wave mixing effect
One wavelength；
First bandpass filter, for extracting the signal of the middle wavelength as ideler frequency light；
Second coupler, after using the ideler frequency light as secondary signal light, with the second coupling pump light, send to
In two nonlinear dielectric optical fiber；
Second nonlinear dielectric optical fiber, it is the by the wavelength convert of the secondary signal light for through four-wave mixing effect
Two wavelength；
And second bandpass filter, for extracting the signal of the second wave length as output light.
Alternatively, in addition to：
Amplifier, for first flashlight, first pump light, second pump light, the ideler frequency light
And the output light is amplified.
Alternatively, the length of the first nonlinear dielectric optical fiber be 150m, chromatic dispersion gradient 0.024ps.nm-2.km-1,
Nonlinear factor is 6.9W-1km-1, it is lost as 6.2dB.km-1, excited Brillouin threshold value is 0.65W；
The length of the second nonlinear dielectric optical fiber is 100m, chromatic dispersion gradient 0.006ps.nm-2.km-1, it is non-linear
Coefficient is 10.8W-1km-1, it is lost as 0.8dB.km-1, excited Brillouin threshold value is 0.18W.
The method and system provided by the present invention for realizing flashlight Spectral integration, by by the first flashlight and first
After coupling pump light, in the first nonlinear dielectric optical fiber carry out first order wavelength convert, then by the ideler frequency light extracted with
After second coupling pump light, second level wavelength convert is carried out in the second nonlinear dielectric optical fiber.Realization provided by the present invention
The method and system of flashlight Spectral integration, using two-stage transformational structure AOWC, not comprising electronic device, eliminate
The influence of " electronic bottleneck " effect, improves conversion efficiency.And the present invention uses two-stage transformational structure, can complete no interval
The phase conjugation problem that wavelength convert and elimination four-wave mixing effect are brought.
Brief description of the drawings
Fig. 1 is a kind of flow of embodiment of the method provided by the present invention for realizing flashlight Spectral integration
Figure；
Fig. 2 is the flow of another embodiment of the method provided by the present invention for realizing flashlight Spectral integration
Figure；
Fig. 3 is the wavelength of another embodiment of the method provided by the present invention for realizing flashlight Spectral integration
Transfer process schematic diagram；
Fig. 4 is a kind of structural frames of embodiment of the system provided by the present invention for realizing flashlight Spectral integration
Figure；
Fig. 5 is the structure of another embodiment of the system provided by the present invention for realizing flashlight Spectral integration
Block diagram；
Fig. 6 is the CO-OFDM signal wavelengths conversion emulation of the system provided by the present invention for realizing flashlight Spectral integration
Lab diagram；
Fig. 7 is that the CO-OFDM signal spectrums of the system provided by the present invention for realizing flashlight Spectral integration integrate emulation
Lab diagram；
Fig. 8 is the conversion efficiency schematic diagram of the system provided by the present invention for realizing flashlight Spectral integration；
Fig. 9 is the constant CO-OFDM signals of first order input signal wavelength BER comparison diagrams after two-stage wavelength convert；
Figure 10 is the constant CO-OFDM signals of second level output signal wavelength BER comparison diagrams after two-stage wavelength convert；
Figure 11 is spectrogram before Spectral integration (ofdm signal frequency spectrum is in wavelength 1550nm positions)：
Figure 12 is spectrogram after Spectral integration (ofdm signal frequency spectrum is converted to 1540nm wavelength locations)；
Figure 13 is CO-OFDM signals BER and planisphere contrast before and after Spectral integration.
Embodiment
In order that those skilled in the art more fully understand the present invention program, with reference to the accompanying drawings and detailed description
The present invention is described in further detail.Obviously, described embodiment is only part of the embodiment of the present invention, rather than
Whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, belongs to the scope of protection of the invention.
A kind of flow chart such as Fig. 1 of embodiment of the method provided by the present invention for realizing flashlight Spectral integration
Shown, this method includes：
Step S101：After the first flashlight and the first coupling pump light, send into the first nonlinear dielectric optical fiber；
Step S102：Through four-wave mixing effect in the first nonlinear dielectric optical fiber, by first flashlight
Wavelength convert is first wave length；
Step S103：The signal of the first wave length is extracted as ideler frequency light；
Step S104：After using the ideler frequency light as secondary signal light, with the second coupling pump light, send to second non-thread
In property medium optical fiber；
Step S105：Through four-wave mixing effect in the second nonlinear dielectric optical fiber, by the secondary signal light
Wavelength convert is second wave length；
Step S106：The signal of the second wave length is extracted as output light.
The method provided by the present invention for realizing flashlight Spectral integration, by by the first flashlight and the first pump light
After coupling, first order wavelength convert is carried out in the first nonlinear dielectric optical fiber, then by the ideler frequency light extracted and the second pump
After the optical coupling of Pu, second level wavelength convert is carried out in the second nonlinear dielectric optical fiber.It is provided by the present invention to realize flashlight
The method and system of Spectral integration, using two-stage transformational structure AOWC, not comprising electronic device, eliminate " electricity
The influence of sub- bottleneck " effect, improves conversion efficiency.And the present invention uses two-stage transformational structure, can complete without interval wavelength
The phase conjugation problem that conversion and elimination four-wave mixing effect are brought.
The wavelength shifter of existing optical-electrical-optical Wavelength transformational structure, it needs to use electronic device part, due to " electronics
The limitation of bottleneck ", switching rate is relatively low, opaque to signal rate.The phase and amplitude of original signal is believed in transfer process
Breath can not retain, and (wavelength convert that can not complete ofdm signal) opaque to format modulation signal, signal regeneration is costly, can
Low by property, device upgrade is difficult.
And the All-Optical Wavelength Conversion Techniques based on highly nonlinear optical fiber (HNLF) four-wave mixing effect (FWM), have to letter
Number modulation format and bit rate is transparent, switching rate block, converted band are wider, the features such as easily realizing simple in construction.But
In single-stage AOWC structure, there is a wavelength interval between pump light and wavelength light, therefore can not realize that OFDM believes
Number any move.In consideration of it, in another embodiment provided by the present invention, two-stage Wavelength transformational structure is utilized
AOWC to ofdm signal carry out Spectral integration.This method is simple in construction, easy realization, more available for high-speed
Modulated signal.
As Fig. 2 is provided by the present invention realize flashlight Spectral integration method another embodiment flow
Shown in figure, compared with a upper embodiment, the first nonlinear dielectric optical fiber is specially highly nonlinear optical fiber in the present embodiment
(HNLF1), the second nonlinear dielectric optical fiber is specially highly nonlinear optical fiber (HNLF2), the first flashlight be specially coherent light just
Frequency-division multiplex singal light (CO-OFDM) is handed over, the first pump light is continuous light.
This method includes：
Step S201：By CO-OFDM flashlights and the first pump light after the coupling of the first coupler, send to the first Gao Fei
In linear optical fiber HNLF1；
Step S202：Through four-wave mixing (FWM) effect in the first highly nonlinear optical fiber (HNLF1), by CO-OFDM signals
Light is changed to first wave length λmPlace；
λmOutside conversion wave band band, by bandpass filter by middle wavelength XmIdeler frequency light filter out, so far, complete first
Level wavelength convert.
Step S203：The signal of first wave length is filtered out as ideler frequency light；
Step S204：Using the ideler frequency light as secondary signal light, with the second pump light after the second coupler couples, send
Into the second highly nonlinear optical fiber HNLF2；
Step S205：Through four-wave mixing (FWM) effect in the second highly nonlinear optical fiber HNLF2, complete to turn flashlight
Shift to the second wave length λ of final outputiPlace；
Step S206：The signal of the second wave length is extracted as output light.
As shown in the wavelength-conversion process schematic diagram of Fig. 3 two-stage HNLF-FWM transformational structures, due in the first level conversion
Between ideler frequency light outside converted band so that when carrying out second and changing, any that conversion light can be transformed into converted band
Position, i.e., changed without interval.And by FWM effects, the phase conjugation of conversion light are reduced twice.
And in the case where only one-level FWM is changed, because flashlight and pump light carry out FWM in nonlinear dielectric
When, it is necessary to enough spaces are left, consider that pump light has identical interval in both sides so that are existed in flashlight both sides certain
The frequency band of size is consequently not used for wavelength convert, i.e. dotted box portion in figure by first order flashlight, so just limits ripple
The flexibility of long conversion and practicality, meanwhile, phase conjugation be present in its conversion light.
The method for realizing CO-OFDM flashlight Spectral integrations that the present embodiment provides, it eliminates " electronics without electronic device
Bottleneck " effects.HNLF can be used for high speed modulated signal as ultra-fast nonlinear medium, the response time of femtosecond magnitude, because
This is to conversion signal transparent rate.FWM processes can retain phase amplitude information, transparent to modulation format (to complete OFDM letters
Number wavelength convert), converted band is wide, up to 30nm.And the present invention can be entered using two-stage Wavelength transformational structure to optical signal
Row is changed without interval, the flexibility of increase wavelength shifter in the application, while second level Wavelength transformational structure can go back reason
In phase conjugation caused by FWM effects, it is set to be preferably applied for the wavelength convert of phase modulation format optical signal, such as DP-
QPSK signals and CO-OFDM signals etc..
Meanwhile CO-OFDM technologies combine the advantages of OFDM and light coherent detection technology, not only improve the availability of frequency spectrum
And antijamming capability, also improve OSNR tolerances and PMD susceptibilitys, near-linear completes radio frequency to light modulation and light to radio frequency
Demodulation.
A kind of structured flowchart of embodiment of the system provided by the present invention for realizing flashlight Spectral integration is such as
Shown in Fig. 4, the system includes：
First coupler, for by after the first flashlight and the first coupling pump light, sending to the first nonlinear dielectric
In optical fiber；
First nonlinear dielectric optical fiber, it is the by the wavelength convert of first flashlight for through four-wave mixing effect
One wavelength；
First bandpass filter, for extracting the signal of the middle wavelength as ideler frequency light；
Second coupler, after using the ideler frequency light as secondary signal light, with the second coupling pump light, send to
In two nonlinear dielectric optical fiber；
Second nonlinear dielectric optical fiber, it is the by the wavelength convert of the secondary signal light for through four-wave mixing effect
Two wavelength；
And second bandpass filter, for extracting the signal of the second wave length as output light.
As a kind of preferred embodiment, the system provided by the present invention for realizing flashlight Spectral integration can also enter one
Step includes：
Amplifier, for first flashlight, first pump light, second pump light, the ideler frequency light
And the output light is amplified.
As Fig. 5 is provided by the present invention realize flashlight Spectral integration system another embodiment structure
Shown in block diagram, the transformational structure of CO-OFDM signals is divided into 2 stages.The wavelength shifter first order is used as letter using CO-OFDM signals
Number light, for continuous light as pump light, the nonlinear dielectric for producing four-wave mixing effect has selected highly nonlinear optical fiber, and its advantage is
Reduce converter size, reduce energy consumption and reduce time delay etc., after converting through bandpass filter export needed for wavelength light.Wavelength
The converter second level and the first order are identical in structure, and maximum difference is the output that input signal light is changed to the first order
Light, completing the conversion light after two level conversions can directly be demodulated.Wherein, the wavelength of middle ideler frequency light is 1560nm.First
Level, the input power of pump light is 27.9dBm, and the input power of flashlight is 9.1dBm；The second level, pumping optical input power are
22.3dBm, signal optical input power are 7.9dBm.Meanwhile table 1 lists the important parameter of two sections of optical fiber.
The HNLF of table 1 important parameter
| Title | HNLF1 | HNLF2 |
| Length (m) | 150 | 100 |
| Chromatic dispersion gradient (ps.nm-2.km-1) | 0.024 | 0.006 |
| Nonlinear factor (W-1.km-1) | 6.9 | 10.8 |
| Net sectional area (um2) | 15.2 | 12.4 |
| (dB.km is lost-1) | 6.2 | 0.8 |
| Zero dispersion point (nm) | 1545 | 1545 |
| Excited Brillouin threshold value (W) | 0.65 | 0.18 |
Fig. 6 is shown based on OptiSystem simulation softwares analogous diagram corresponding with the application.Its simulation process and above
Describe identical：Transformational structure is divided into 2 stages, and it is two-stage Wavelength transformational structure.The wavelength shifter first order is believed with CO-OFDM
Number flashlight being used as, for continuous light as pump light, the nonlinear dielectric for producing four-wave mixing effect has selected highly nonlinear optical fiber,
Through middle ideler frequency light needed for the Rectangular Band-pass Filter output with a width of 0.48nm after converting.The wavelength shifter second level with
The first order is identical in structure, and maximum difference is the first order output light that input signal light is changed to after amplification, and output is most
After whole target conversion light, completing the conversion light after two level conversions can directly be demodulated.
The Spectral integration lab diagram based on it is provided on the experiment basis of above two-layer configuration wavelength convert, such as Fig. 7 institutes
Show.Before Spectral integration is carried out, CO-OFDM filters out feeding by the bandpass filter with a width of 0.48nm and is based on two-stage transformational structure
HNLF-FWM AOWCs in, converter structure is identical with Fig. 6 contents above, through Spectral integration, finally couples
In letter in reply number, Spectral integration is completed.
Two-stage conversion efficiency is illustrated in fig. 8 shown below, wave-length coverage of the first order conversion efficiency higher than -10dB more than 30nm, from
1525nm-1555nm；Wave-length coverage of the second level conversion efficiency higher than -16dB is more than 35nm, from 1520nm-1555nm.This two
Rank Wavelength transformational structure has the wider converted bands of 30nm.The converted band tested in the present embodiment is 1525nm-1555nm
Between 30nm scope.
The wavelength convert experimental result of CO-OFDM signals shown in Fig. 6 as shown in Figure 9 and Figure 10, is changed in converted band
The BER of signal makes comparisons with the BER of back-to-back CO-OFDM signals.Fig. 9 first order flashlight input wavelength is constant, only changes
Second level output signal optical wavelength, the BER curve of output signal light almost coincide together, and illustrate in whole convertible bandwidth model
In enclosing, the signal performance after conversion is basically identical.Change first order flashlight input wavelength in Figure 10, and second level output signal
Optical wavelength is constant, observes output signal light BER, only 1525nm input lights have slightly difference, other to be substantially the same, with Fig. 8
Middle first order conversion efficiency is slightly lower at 1525nm, and other wavelength be basically unchanged it is relevant.Fig. 9 and Figure 10 is 10 in BER-9
Place, transition signal power cost is all substantially in -3dB or so.
Spectral integration experimental result shown in Fig. 7 is provided by following a few width figures, before and after wherein Figure 11,12 provide Spectral integration
Spectrogram, Figure 13 gives BER curve and corresponding planisphere before and after Spectral integration.In Figure 13, left side is before Spectral integration
The planisphere of CO-OFDM signals demodulation, right side are the planisphere of CO-OFDM signals demodulation after Spectral integration.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be with it is other
The difference of embodiment, between each embodiment same or similar part mutually referring to.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (9)
- A kind of 1. method for realizing flashlight Spectral integration, it is characterised in that including：After the first flashlight and the first coupling pump light, send into the first nonlinear dielectric optical fiber；It is first by the wavelength convert of first flashlight through four-wave mixing effect in the first nonlinear dielectric optical fiber Wavelength；The signal of the first wave length is extracted as ideler frequency light；After using the ideler frequency light as secondary signal light, with the second coupling pump light, send into the second nonlinear dielectric optical fiber；It is second by the wavelength convert of the secondary signal light through four-wave mixing effect in the second nonlinear dielectric optical fiber Wavelength；The signal of the second wave length is extracted as output light.
- 2. the method as claimed in claim 1 for realizing flashlight Spectral integration, it is characterised in that first nonlinear dielectric Optical fiber is highly nonlinear optical fiber.
- 3. the method as claimed in claim 2 for realizing flashlight Spectral integration, it is characterised in that second nonlinear dielectric Optical fiber is highly nonlinear optical fiber.
- 4. the method as claimed in claim 3 for realizing flashlight Spectral integration, it is characterised in that first flashlight is phase Dry light orthogonal frequency-division multiplex singal light.
- 5. the method as claimed in claim 4 for realizing flashlight Spectral integration, it is characterised in that first pump light is company Continuous light.
- 6. the as claimed in claim 5 method for realizing flashlight Spectral integration, it is characterised in that first flashlight it is defeated It is 9.1dBm to enter power, and the input power of first pump light is 27.9dBm.
- 7. the as claimed in claim 6 method for realizing flashlight Spectral integration, it is characterised in that the secondary signal light it is defeated It is 7.9dBm to enter power, and the input power of second pump light is 22.3dBm.
- A kind of 8. system for realizing flashlight Spectral integration, it is characterised in that including：First coupler, for by after the first flashlight and the first coupling pump light, sending to the first nonlinear dielectric optical fiber In；First nonlinear dielectric optical fiber, for being first wave by the wavelength convert of first flashlight through four-wave mixing effect It is long；First bandpass filter, for extracting the signal of the first wave length as ideler frequency light；Second coupler, after using the ideler frequency light as secondary signal light, with the second coupling pump light, send to second non- In linear medium optical fiber；Second nonlinear dielectric optical fiber, for being the second ripple by the wavelength convert of the secondary signal light through four-wave mixing effect It is long；And second bandpass filter, for extracting the signal of the second wave length as output light.
- 9. the system as claimed in claim 8 for realizing flashlight Spectral integration, it is characterised in that first nonlinear dielectric The length of optical fiber is 150m, chromatic dispersion gradient 0.024ps.nm-2.km-1, nonlinear factor 6.9W-1km-1, is lost and is 6.2dB.km-1, excited Brillouin threshold value are 0.65W；The length of the second nonlinear dielectric optical fiber is 100m, chromatic dispersion gradient 0.006ps.nm-2.km-1, nonlinear factor For 10.8W-1km-1, it is 0.18W to be lost as 0.8dB.km-1, excited Brillouin threshold value.
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| CN107645338B (en) * | 2017-10-24 | 2019-06-18 | 华中科技大学 | A kind of full plain edge of configurable optical signal is along detection system |
| CN113037424B (en) * | 2021-03-12 | 2023-05-09 | 广东科学技术职业学院 | Channel selection method and device for elastic optical network |
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| CN103166101A (en) * | 2013-02-05 | 2013-06-19 | 西安邮电大学 | Wave length converter based on stimulated raman scattering and method |
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