CN105974709B - Full-light grid-free frequency spectrum integrator - Google Patents
Full-light grid-free frequency spectrum integrator Download PDFInfo
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
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Abstract
The invention relates to an all-optical raster-free frequency spectrum integrator, which is provided with first signal light by a signal generating device and comprises pump light sources arranged on two sides of an optical fiber, wherein two sides of the optical fiber are respectively connected with an optical circulator. When the all-optical grid-free spectrum integrator performs wavelength conversion, signal light on the left and pump light are coupled by a coupler and then sent into HNLF, a third port of a circulator at the right output end of the HNLF is connected with an optical bandpass filter and used for filtering out a conversion signal obtained after first wavelength conversion, the conversion signal is amplified and is used as signal light for second wavelength conversion after filtering processing, the signal light is coupled with the pump light on the right and then input from the right side of the HNLF, the second wavelength conversion process is realized, the conversion signal obtained by second wavelength conversion is output by the third port of the circulator on the left side of the HNLF, and the signal light can be filtered out by the optical bandpass filter. This structure accomplishes two wavelength conversion processes using only one stage of HNLF.
Description
Technical field
The present invention relates to a kind of Wavelength converters more particularly to a kind of full light without grid Spectral integration device.
Background technique
Wavelength convert is concerned all the time as a key technology for realizing spectrum allocation strategy in optical-fiber network,
When solving the problems, such as optical-fiber network frequency spectrum fragment, in addition to the frequency spectrum allocation algorithm of network layer, the Wavelength transformational structure of transport layer is same
Sample is extremely important.In various wavelength conversion technologies, it is based on the wavelength of highly nonlinear optical fiber (HNLF) four-wave mixing effect (FWM)
Conversion because to signal format, bit rate transparent, conversion rate it is high, it can be achieved that the advantages such as multi-wavelength is converted simultaneously and possess more
Wide prospect.
It is complicated and changeable due to service traffics in elastic optical network, system spectral resources by continuous distribution release, due to
The accumulation of time, will appear the frequency spectrum of some free time in whole network, these idle frequency spectrums not only cause the wave of frequency spectrum resource
Take, and increases network and the probability blocked occur.As shown in Figure 1, node A, B, C, D form one simply by link 1,2,3
Communication network, e the and f signal issued by A node are transmitted to node C via link 1, as can be seen from Figure 1 deposit between e and f
In certain spectrum gap, i.e., so-called frequency spectrum fragment；Node C is also transmitted to by link 2 by the g signal that B node issues, in node
After C, if without Spectral integration process can there is a situation where links 3, there are frequency spectrum fragment between e and f, it is mixed that frequency spectrum occurs for e and g
Folded to cause network congestion problem, if there is a Spectral integration process at node C, elimination frequency spectrum fragment can be achieved to be made simultaneously
Signal passes through node.
Another kind is directed to the Spectral integration scheme of the above frequency spectrum fragment problem: as shown in Fig. 2, this scheme medium wavelength is converted
The main object that process is related to is the e signal in No. 1 link, and the main purpose of conversion is the frequency eliminated between e frequency spectrum and f frequency spectrum
Gap is composed, it has been observed that, spectrum gap is smaller herein, and one time wavelength-conversion process cannot achieve target, therefore make herein
With wavelength-conversion process twice: first converting on the right side of f frequency spectrum e frequency spectrum, then replace pump wavelength position, keep f frequency spectrum right
The conversion signal of side is converted again to its left side, and eliminates spectrum intervals, is finally reached and is not only avoided spectral aliasing, but also eliminates frequency spectrum
The purpose at interval.
Wavelength-conversion process, the processing method of the prior art are using two-stage twice involved in program specific implementation process
HNLF carries out the two-stage of wavelength-conversion process application twice HNLF and carries out the schematic diagram that wavelength convert twice realizes Spectral integration process
As shown in Figure 3: in first time wavelength convert, the continuous light that tunable laser issues is after EDFA amplifies, then by light belt pass filter
Device filters out adaptive amplification noise, forms pump light, and pump light is coupled into the first order via coupler with modulated signal
In HNLF, four-wave mixing process is carried out, second of wavelength-conversion process, pump light part is in addition to wavelength, without changing in structure,
However signal herein derives from the gained ideler frequency light of first time wavelength-conversion process, the i.e. conversion signal of first time wavelength convert
Signal source as second of wavelength convert.
From the point of view of current practical application angle, HNLF still falls within the nonlinear material of price costly, using two-stage
HNLF carries out wavelength convert twice and realizes although Spectral integration may be implemented to integrate purpose, but two-stage HNLF makes system cost
It is excessively high.
In view of the above shortcomings, the designer, is actively subject to research and innovation, to found a kind of new structural full light
Without grid Spectral integration device, make it with more the utility value in industry.
Summary of the invention
In order to solve the above technical problems, only making the object of the present invention is to provide a kind of transmitted in both directions characteristic using optical fiber
The full light of wavelength-conversion process twice can be completed without grid Spectral integration device with level-one HNLF, to reduce optical fiber usage quantity,
Reduce cost.
Full light of the invention provides the first signal light without grid Spectral integration device, by signal generation apparatus for it, comprising:
First pump light source exports the first pump light；
The of first optical circulator is inputted after first optical circulator, first pump light and the first signal optical coupling
Single port, and exported by the second port of first optical circulator；
Optical fiber receives and guides first pump light and first exported by the first optical circulator second port
Signal light, and using the nonlinear optical phenomena that the optical fiber is generated when guiding first pump light and the first signal light come
Generate the first conversion signal；
Second optical circulator, second port input first conversion signal and are simultaneously exported by its third port, as the
Binary signal light；
Second pump light source exports the second pump light；
The first port of second optical circulator is inputted after second pump light and second signal optical coupling, and by institute
State the second port output of the second optical circulator；
The optical fiber is received and is guided by second pump light and the of the second optical circulator second port output
Binary signal light, and the nonlinear optical phenomena generated using the optical fiber when guiding second pump light and second signal light
To generate the second conversion signal；
The first optical circulator second port inputs second conversion signal and is exported by its third port.
Further, the third port of second optical circulator, which is also connected with, filters first conversion signal
Wave, amplification and the filter of denoising and amplifier.
Further, the third port of first optical circulator, which is also connected with, is filtered second conversion signal
Filter.
Further, first pump light source and the second pump light source include sequentially connected tunable laser sources,
Amplifier, filter and Polarization Controller.
Further, the signal generation apparatus includes sequentially connected tunable laser sources, modulator, amplifier, filter
Wave device and Polarization Controller, the modulator are also connected with arbitrary waveform generator.
Further, the filter connecting with first optical circulator is also connected with coherent receiver.
Further, the optical fiber is highly nonlinear optical fiber.
Further, the filter is optical band pass filter.
Further, the amplifier is erbium-doped fiber amplifier.
Further, the modulator is the conspicuous increasing moral modulator of wheat.
According to the above aspect of the present invention, full light of the invention utilizes the transmitted in both directions characteristic of optical fiber without grid Spectral integration device, only make
Wavelength convert twice can be completed with level-one highly nonlinear optical fiber, saved highly nonlinear optical fiber usage quantity, reduced costs.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And can be implemented in accordance with the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention and the accompanying drawings.
Detailed description of the invention
Fig. 1 is network spectrum fragmentation problem and Spectral integration effect diagram in background technique；
Fig. 2 is wavelength convert Spectral integration scheme schematic diagram twice in background technique；
Fig. 3 is that two-stage HNLF realizes two rank Wavelength transformational structure schematic diagrames in background technique；
Fig. 4 is the bi-directional wavelength transformational structure schematic diagram in the present invention based on single-stage HNLF；
Fig. 5 is the structural schematic diagram of circulator in the present invention；
Fig. 6 is the simulation architecture figure that the present invention completes Spectral integration；
Fig. 7 is not integrate frequency spectrum original state schematic diagram；
Fig. 8 is spectrum diagram after first time wavelength convert；
Fig. 9 is Spectral integration final effect schematic diagram；
Figure 10 is conversion signal planisphere, eye figure；
Figure 11 is the BER curve figure of full optical spectrum integrator conversion signal；
Figure Chinese and English referred to as Chinese control: TLS: tunable laser sources；AWG: arbitrary waveform generator；MZM: Mai He increases moral
Modulator；EDFA: erbium-doped fiber amplifier；OBPF: optical band pass filter；PC: Polarization Controller；ISO: optoisolator；
Circulator: optical circulator；HNLF: highly nonlinear optical fiber；CR: coherent reception.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement below
Example is not intended to limit the scope of the invention for illustrating the present invention.
Referring to fig. 4, a kind of full light described in a preferred embodiment of the present invention is filled without grid Spectral integration device by signal
It is set to it and the first signal light is provided, the pump light source of optical fiber two sides is set, and optical fiber two sides are separately connected an optical circulator, the ring of light
There are three ports altogether for row device, are the first optical circulator on the left of optical fiber, are the second optical circulator on the right side of optical fiber.Its
In, signal generation apparatus includes sequentially connected tunable laser sources, modulator, amplifier, filter and Polarization Controller, is adjusted
Device processed is also connected with arbitrary waveform generator, and signal generation apparatus is for exporting the first signal light.Two pump light sources include according to
Tunable laser sources, amplifier, filter and the Polarization Controller of secondary connection, for exporting the first pump light respectively, (optical fiber is left
Side) and the second pump light (on the right side of optical fiber).The first of the first optical circulator is inputted after first pump light and the first signal optical coupling
Port, and exported by the second port of the first optical circulator；Optical fiber is received and is guided and exported by the first optical circulator second port
The first pump light and the first signal light, and using optical fiber guide the first pump light with generated when the first signal light it is non-linear
Optical phenomena generates the first conversion signal；First conversion signal inputs the second port of the second optical circulator, and by the second light
Circulator third port output, as second signal light；The second ring of light row is inputted after second pump light and second signal optical coupling
The first port of device, and exported by the second port of the second optical circulator；Optical fiber is received and is guided by the second optical circulator second
The second pump light and second signal light of port output, and generated using optical fiber when guiding the second pump light with second signal light
Nonlinear optical phenomena generate the second conversion signal；Second conversion signal inputs the first optical circulator second port and by it
Third port output.
To ensure that the first conversion signal as second signal light is noiseless, signal is sufficiently strong, the present invention is in second ring of light
The third port of row device is also connected with the filter and amplifier that the first conversion signal is filtered, amplifies and is denoised.
For the jamming incoherent signal for eliminating final conversion signal, the present invention is also connected in the third port of the first optical circulator
To the filter that the second conversion signal is filtered, the second conversion signal is received by coherent receiver after the filtering, carries out number
Analysis.
As the preferred embodiment of the present invention, optical fiber is highly nonlinear optical fiber among the above, and filter is light belt pass filter
Device, amplifier are erbium-doped fiber amplifier, and modulator, which is that wheat is conspicuous, increases moral modulator, to obtain preferable conversion signal.
There are three interfaces altogether for circulator in the present invention, as shown in figure 5, damaging along existing for circulator internal arrows direction
Consumption is known as insertion loss, and insertion loss is typically small, and 0.5 to 3dB or so, the inverse existing loss in circulator internal arrows direction claims
For isolation loss, the numerical value is very big, nearly 60dB, so circulator can achieve, inverse arrow direction unobstructed along arrow direction
The effect of cut-off, i.e. signal can only be propagated by port order, such as 1 to 2, and 2 to 3.
Working principle of the present invention is as follows:
The full light is identical as common wavelength shifter without the wavelength-conversion process of grid Spectral integration device from left to right, the left side
Signal light coupled with pump light by coupler after be sent into HNLF among, unlike the structure on the right side of HNLF output connect
Circulator has been connect, has connected an optical band pass filter for filtering out gained after first time wavelength convert in the third port of circulator
Conversion signal (this be first time four-wave mixing process), this conversion signal is amplified, as second after filtering processing
By inputting on the right side of HNLF after the coupling pump light on the signal light of wavelength convert, this signal light and right side, realize that second of wavelength turns
Process is changed, (this is second to the resulting conversion signal of second of wavelength convert by the third port output of the circulator on the left of HNLF
Secondary four-wave mixing process), it can be filtered off with optical band pass filter.In this way, this structure is by being only used only level-one HNLF just
Wavelength-conversion process twice is completed, reduces system cost to a certain extent.
The Spectral integration example that a full light is used to need wavelength convert twice without grid Spectral integration device is given below, tests
Demonstrate,prove the feasibility of the structure: the case where completing Spectral integration for Fig. 4 wavelength convert twice described, it is soft using Optisystem
Part carries out Digital Simulation, and simulation architecture figure is as shown in Figure 6.
Signal wavelength in simulation process are as follows: signal e, 1542nm；Signal f, 1543nm；Signal g, 1542nm；In this way,
Spectral aliasing occurs for signal e and signal g, causes network congestion, does wavelength convert processing to signal e herein, eliminates between e and f
Frequency spectrum fragment.The initial position of signal e (left side) and f (right side) is as shown in Figure 7: the signal e and wavelength that wavelength is 1542
For 1543 signal f spacing very little, therefore the elimination of spectrum intervals can not be only realized by a step wavelength-conversion process.Therefore this
In apply secondary wavelength convert, this target is completed by wavelength-conversion process twice: firstly, for the first time convert, pumping wavelength
It is set as 1545nm, and then converts gained signal location as 1548nm, filter filters conversion signal obtained by first time wavelength convert
Out, the input signal as second of conversion uses, and frequency spectrum is as shown in Figure 8 after converting for the first time；In second of conversion, pumping wave
Long position is 1545.25nm, therefore the final wavelength location of conversion signal obtained by final second of wavelength convert is 1542.5nm.Turn
Pumping is CW pumping used in the process of changing, finally after converting twice, signal e (centre), f (right side), g (left side) three
The positional relationship of person is as shown in Figure 9.
Observation Fig. 9 can have found, carry out Spectral integration using the method for secondary wavelength change, can get ideal integration
Effect, spectrum intervals can be eliminated, while solve the problems, such as network congestion caused by spectral aliasing.
Other than conversion spectrum, conversion signal quality is also to measure an important indicator of Wavelength transformational structure performance,
The quality indication signal tested in simulation process includes conversion signal planisphere, eye figure, BER curve, use as shown in Figure 10
Full light completes the conversion signal planisphere and eye figure of wavelength convert twice without grid Spectral integration device.Compare first, the of Figure 10
Two times transfer signal constellation (in digital modulation) figure, it is possible to find the amplitude noise in second of conversion signal than more in first time conversion signal,
Compare from eye figure it is also seen that, the eye figure of second of conversion signal is compared with the eye figure of first time conversion signal, and more in a jumble, this is
Why the performance that amplitude noise aggravates will appear the case where amplitude noise aggravates mainly due to carrying out second of wavelength convert
When, input signal is the conversion signal of first time wavelength convert, has been incorporated into partial noise, is drawn in second of conversion process in addition
The noise entered causes the cumulative of noise.Figure 11 is turn for carrying out wavelength convert twice without grid Spectral integration device using full light
Signal BER curve figure is changed, gives the BER curve under the back-to-back transmission state of input signal in figure simultaneously, it can from figure
It is out 10 in BER-9For second of conversion signal compared with first time conversion signal, power loss is about 2dBm when the order of magnitude, this
The numerical value CO-OFDM signal advanced for modulation format can receive, therefore think that conversion signal quality is good herein.
The above is only a preferred embodiment of the present invention, it is not intended to restrict the invention, it is noted that for this skill
For the those of ordinary skill in art field, without departing from the technical principles of the invention, can also make it is several improvement and
Modification, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (7)
1. a kind of full light provides the first signal light without grid Spectral integration device, by signal generation apparatus for it, it is characterised in that packet
It includes:
First pump light source exports the first pump light；
The first end of first optical circulator is inputted after first optical circulator, first pump light and the first signal optical coupling
Mouthful, and exported by the second port of first optical circulator；
Optical fiber receives and guides first pump light and the first signal that are exported by the first optical circulator second port
Light, and generated using the optical fiber guiding first pump light with the nonlinear optical phenomena that generates when the first signal light
First conversion signal；
Second optical circulator, second port input first conversion signal and are exported by its third port, as the second letter
Number light；The third port of second optical circulator be also connected in turn first conversion signal is filtered, amplify and
The first filter of denoising, the first amplifier and second filter；
Second pump light source exports the second pump light；
Input the first port of second optical circulator after second pump light and second signal optical coupling, and by described the
The second port of two optical circulators exports；
The optical fiber receives and guides second pump light and the second letter by the second optical circulator second port output
Number light, and produced using the optical fiber guiding second pump light with the nonlinear optical phenomena that generates when second signal light
Raw second conversion signal；
The first optical circulator second port inputs second conversion signal and is exported by its third port.
2. full light according to claim 1 is without grid Spectral integration device, it is characterised in that: the of first optical circulator
Three ports are also connected with the third filter being filtered to second conversion signal.
3. full light according to claim 1 is without grid Spectral integration device, it is characterised in that: first pump light source includes
Sequentially connected first tunable laser sources, the second amplifier, the 4th filter and the first Polarization Controller, second pumping
Light source includes sequentially connected second tunable laser sources, third amplifier, the 5th filter and the second Polarization Controller.
4. full light according to claim 1 is without grid Spectral integration device, it is characterised in that: the signal generation apparatus includes
Sequentially connected third tunable laser sources, modulator, the 4th amplifier, the 6th filter and third Polarization Controller, it is described
Modulator is also connected with arbitrary waveform generator.
5. full light according to claim 2 is without grid Spectral integration device, it is characterised in that: connect with first optical circulator
The third filter connect is also connected with coherent receiver.
6. full light according to claim 1-5 is without grid Spectral integration device, it is characterised in that: the optical fiber is height
Nonlinear optical fiber.
7. full light according to claim 4 is without grid Spectral integration device, it is characterised in that: the modulator, which is that wheat is conspicuous, increases moral
Modulator.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104901742A (en) * | 2015-06-18 | 2015-09-09 | 苏州大学张家港工业技术研究院 | Method and system for realizing frequency spectrum integration of signal light |
| CN205920306U (en) * | 2016-06-22 | 2017-02-01 | 苏州大学 | Full-light grid-free frequency spectrum integrator |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104901742A (en) * | 2015-06-18 | 2015-09-09 | 苏州大学张家港工业技术研究院 | Method and system for realizing frequency spectrum integration of signal light |
| CN205920306U (en) * | 2016-06-22 | 2017-02-01 | 苏州大学 | Full-light grid-free frequency spectrum integrator |
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| Title |
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| Abhishek Anchal et al.Bidirectional FWM scheme for entangled photon generation in optical fibers.《International Conference on Fiber Optics and Photonics》.2012,全文. * |
| Efficient all-optical 2R regeneration using self-phase modulation in bidirectional fiber configuration;Masayuki Matsumoto;《OPTICS EXPRESS》;20061113;全文 * |
| Method for effectively utilizing tunable one-pump fiber parametric wavelength converters as an enabling device for WDM routers;Sheng Cui et al;《OPTICS EXPRESS》;20090102;第2-3章 * |
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