CN206618934U - Aowc - Google Patents
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- CN206618934U CN206618934U CN201720299492.8U CN201720299492U CN206618934U CN 206618934 U CN206618934 U CN 206618934U CN 201720299492 U CN201720299492 U CN 201720299492U CN 206618934 U CN206618934 U CN 206618934U
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- aowc
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Abstract
The utility model is related to a kind of efficient AOWC based on highly nonlinear optical fiber, including the transmitting terminal and receiving terminal connected by optical fiber, wherein the transmitting terminal will input the optical fiber after flashlight and coupling pump light；What the optical fiber included cascade mixes aluminium optical fiber and germnium doped fiber, it receives and guided the flashlight and pump light exported by the transmitting terminal, and the nonlinear optical phenomena produced using the optical fiber when guiding the flashlight and pump light produces conversion light；The receiving terminal receives the conversion light of the optical fiber output.The utility model proposes mix 150m aluminium HNLF and 100m mix germanium HNLF and be concatenated together realizing the AOWC scheme of high conversion efficiency, without using the pumping dither technique of any raising SBS threshold in the program, 3.1dB conversion efficiency is can be realized as using only commercial HNLF.In addition, after being changed to 25Gb/s QPSK signals, measuring it 10‑5Power attenuation during series BER can be less than 0.5dB level.
Description
Technical field
The utility model is related to a kind of Wavelength converter, more particularly to a kind of efficient full light based on highly nonlinear optical fiber
Wavelength shifter.
Background technology
In the problem of the network capacity for solving constantly to rise, how effectively to become particularly significant using frequency spectrum resource.Remove
Outside with the advanced modulation formats with spectral efficient, Spectral integration is also important skill for improving the availability of frequency spectrum
Art.In transport layer, Spectral integration technology is mainly reflected in network algorithm and two aspects of wavelength convert.Wavelength conversion technology energy
Enough redistribute Wavelength distribution and strengthen flexibility and the utilization rate of frequency spectrum.Compared to Traditional photovoltaic/electric light wavelength shifter
Say, AOWC has many advantages, for example：Relatively low energy loss, the response for breaking speed of electronics bottleneck
Speed and to modulation format signal rate transparency etc..It is currently based on the AOWC of different nonlinear dielectrics
Many researchs have been expanded, for example, have been had based on semiconductor optical amplifier, highly nonlinear optical fiber (HNLF), silicon waveguide etc..Base
Superfast signal can be handled in HNLF All Optical Wavelength Conversion scheme because of the super fast response speed of Kerr effect, and whole
The characteristics of there is low-loss and the controllability to dispersion during individual so that it takes off grain husk in numerous All Optical Wavelength Conversion schemes
And go out.
Conversion efficiency (conversion efficiency, CE) is to weigh a wavelength shifter quality with switching bandwith
Two standards.In the wavelength shifter based on HNLF, conversion efficiency mainly determines (definition by nonlinear phase shift γ PL
For pump power PP, nonlinear coefficient γ, fiber lengths L, the product of three), γ PL are bigger, and conversion efficiency is higher.But nothing
Method improves conversion efficiency by infinitely increasing pump power, and this is due to that the pump power being input in HNLF can be excited
The limitation of Brillouin threshold (SBS threshold).The research work of many has been expanded at present to improve SBS threshold,
Method exactly " is shaken " with most.This method makes its power distribution in a smaller frequency spectrum by " shake " pump light
In the range of, so as to keep significantly reducing the peak power of pumping on the premise of pumping general power is constant.But at the same time,
This method will introduce jittering noise in conversion signal, produce distortion.
In view of above-mentioned defect, the design people is actively subject to research and innovation, to found a kind of new structure based on
The efficient AOWC of highly nonlinear optical fiber, makes it with more the value in industry.
Utility model content
In order to solve the above technical problems, the purpose of this utility model, which is to provide one kind, need not improve SBS threshold, without shake
Pump light, only can be realized as the AOWC of high conversion efficiency by optical fiber.
AOWC of the present utility model, including the transmitting terminal and receiving terminal connected by optical fiber, wherein
- the transmitting terminal will flashlight with inputting the optical fiber after coupling pump light；
What-the optical fiber included cascade mixes aluminium optical fiber and germnium doped fiber, and it receives and guides what is exported by the transmitting terminal
The flashlight and pump light, and the nonlinear optics produced using the optical fiber when guiding the flashlight with pump light is existing
As producing conversion light；
- the receiving terminal receives the conversion light of the optical fiber output.
Further, the aluminium optical fiber and the length ratio of germnium doped fiber mixed is 3:2.
Further, the transmitting terminal by the flashlight and pump light with 3：The optical fiber is inputted after 7 ratio coupling.
Further, the input power of the pump light is the SBS threshold for mixing aluminium optical fiber.
Further, the transmitting terminal includes signal optical source and pump light source, and the signal optical source is wrapped with pump light source
Include the tunable laser sources being sequentially connected, amplifier, optical band pass filter and Polarization Controller.
Further, the amplifier is erbium-doped fiber amplifier.
Further, it is also associated with optoisolator between the transmitting terminal and the optical fiber.
Further, it is also associated with optical band pass filter between the optical fiber and the receiving terminal.
Further, the receiving terminal is the test transmitting photo-signal bit error rate and the coherent receiver of planisphere.
Further, adjustable attenuator and half can be also sequentially connected between the optical band pass filter and the receiving terminal
Conductor image intensifer.
By such scheme, the utility model at least has advantages below：
1st, it is concatenated together realizing the AOWC side of high conversion efficiency using two sections of different highly nonlinear optical fibers
Case, it has -8dB (in theory with -3.1dB) conversion efficiency and good conversion signal performance；
2nd, using aluminium optical fiber and germnium doped fiber cascade is mixed, effectively increase nonlinear phase shift is so as to realize carrying for conversion efficiency
Height, wherein it is, for improving SBS threshold, germnium doped fiber to be used in second segment to mix aluminium optical fiber, it has less dispersion
Slope and decay, to make up the loss of optical fiber and improve nonlinear phase shift；
3rd, 10-5Power attenuation during the series bit error rate can be less than 0.5dB level.
Described above is only the general introduction of technical solutions of the utility model, in order to better understand skill of the present utility model
Art means, and being practiced according to the content of specification, with preferred embodiment of the present utility model and coordinate accompanying drawing detailed below
Describe in detail bright as after.
Brief description of the drawings
Fig. 1 is the wavelength convert analogous diagram based on four-wave mixing；
Fig. 2 is the conversion efficiency figure under different pump powers；
Fig. 3 is the result of calculation curve of different incidence wave strong point conversion efficiencies；
Fig. 4 is the experimental configuration of SBS threshold test；
Fig. 5 is two sections of HNLF transimission power (round dot) and reflection power (square point) curve, wherein, figure (a) is that 150m mixes
Aluminium HNLF transimission power (round dot) and reflection power (square point) curve, figure (b) are the transimission power (circles that 100m mixes germanium HNLF
Point) and reflection power (square point) curve；
Fig. 6 is the structural representation of AOWC of the present utility model；
Fig. 7 is the input/output frequency spectrum of the HNLF in the case of two kinds of incident powers, wherein, the pump power of figure (a) is
22.7dBm, the pump power of figure (b) is 26.7dBm；
Fig. 8 is measurement gained conversion efficiency (dB) vs input signals wavelength (nm), wherein, the pump power of figure (a) is
22.7dBm, the pump power of figure (b) is 26.7dBm；
Fig. 9 is AOWC conversion signal performance test experimental configuration；
Figure 10 is the planisphere of input signal and conversion signal, wherein, figure (a)~(c) BTB signals are respectively：
1535nm, 1545nm, 1557.5nm, figure (d)~(f) conversion signal be respectively：1565nm、1555nm、1542.5nm；
Figure 11 is the BER performances of BTB signals and conversion signal at different wave length, wherein, scheme the BTB signals of (a)：
1535nm, conversion signal：1565nm, schemes the BTB signals of (b)：1545nm, conversion signal：1555nm, schemes the BTB signals of (c)：
1557.5nm, conversion signal：1542.5nm.
The referred to as Chinese control of figure Chinese and English：TLS：Tunable laser sources；AWG：AWG；MZM：Mach Zeng De
Modulator；EDFA：Erbium-doped fiber amplifier；OBPF：Optical band pass filter；PC：Polarization Controller；Isolator：Optoisolator；
Circulator：Optical circulator；HNLF：Highly nonlinear optical fiber；PM：Light power meter；VOA：Adjustable attenuator；SOA：Semiconductor light
Amplifier；Rx：Coherent receiver.
Embodiment
With reference to the accompanying drawings and examples, embodiment of the present utility model is described in further detail.Below
Embodiment is used to illustrate the utility model, but is not limited to scope of the present utility model.
Efficient AOWC based on highly nonlinear optical fiber has that energy loss is low, processing speed fast and modulation
The features such as form is transparent.For the efficient AOWC based on highly nonlinear optical fiber, if its optical fiber is longer, non-thread
Property coefficient is bigger, and pump power is higher, then its conversion efficiency will be higher.However, the input power of pumping can be excited cloth
In deep pool scattering (SBS) limitation, as a rule its longer SBS threshold of optical fiber is lower.In the utility model, it is proposed that a profit
It is concatenated together realizing the AOWC scheme of high conversion efficiency with two sections of different highly nonlinear optical fibers, and passes through reality
Demonstrate its -8dB conversion efficiency and the superperformance of conversion signal.
Principle and emulation
As shown in figure 1, under the auxiliary of pump light, four-wave mixing can be by signal from a wavelength convert to another ripple
In length.It is ideally it is expected that the signal after conversion can have much the same power and performance with input signal.But it is true
On, difference is certainly existed between the two, and the difference power between them is defined as to the conversion efficiency (CE) of wavelength shifter.And
The size of this conversion efficiency depends on the size of nonlinear phase shift, i.e. nonlinear phase shift is bigger, then conversion efficiency is bigger.
For specified HNLF, its such as fiber lengths, decay and dispersion these parameters are all that fixation can not change
, wanting to change nonlinear phase shift γ PL must be by changing the input power of pump light.It is to work as front pump shown in Fig. 2
Pu power calculates the conversion efficiency curve of gained respectively when being set to 16dBm, 18dBm and 20dBm.It is used in computer sim- ulation
One section of length mixes germanium HNLF for 250 meters, and its parameter is as follows：Nonlinear coefficient γ=10.8km-1W-1, attenuation alpha=0.8dB/
Km, zero-dispersion wavelength λ0=1544nm, in addition its chromatic dispersion gradient dD=0.006ps/km/nm2.From figure 2 it can be seen that CE meetings
Improved with the increase of pump power.But it is due to be influenceed by stimulated Brillouin scattering, it is impossible to unlimited increase pumping work(
Rate.For this 250m mix germanium HNLF for, its SBS threshold only has about 18.7dBm.
Compared with 250m germnium doped fiber, equal length, nonlinear coefficient γ=6.9W-1km-1, attenuation alpha=6.2dB/
Km, zero-dispersion wavelength λ0=1550nm, chromatic dispersion gradient dD=0.024ps/ (nm2Km aluminium optical fiber of mixing) has higher SBS thresholds
Value, about 26dBm.The CE curves of the wavelength shifter based on different HNLF are shown in Fig. 3.From the dotted line in figure and short stroke
Line can be seen that compared with mixing germanium HNLF, due to higher SBS threshold, aluminium HNLF wavelength shifter is mixed based on 250m
CE than improving 7.8dB or so based on mix germanium HNLF.In order to obtain higher CE, the utility model is by 250m's
HNLF is divided into two sections, is concatenated together by the one section of 150m germanium HNLF that mixes for mixing aluminium HNLF and another section of 100m.And they its
Its parameter is then consistent with what is introduced before.Because HNLF length shortens, its SBS threshold can be improved accordingly.For mixing for 150m
For aluminium HNLF, its SBS threshold can bring up to 28.04dBm, and the 100m SBS threshold for mixing germanium HNLF then can accordingly on
Rise to 22.5dBm.By the CE curves calculated after this two sections of HNLF cascades by the solid line illustrated in Fig. 3.It is noticeable
It is that now input pumping light power setting is the SBS threshold P that 150m mixes aluminium HNLFSBS=28dBm, and its power output is through considering
Germanium HNLF SBS threshold is just mixed after to the loss of the factors such as joint for second segment 100m.Germanium light is mixed with the exclusive use in Fig. 3
Fine, exclusive use is mixed aluminium optical fiber and compared, and the 150m germanium HNLF that mixes for mixing aluminium HNLF and 100m is concatenated together by the utility model
Scheme, either have improvement in terms of conversion efficiency or the flatness of switching bandwith.In addition, when pumping input power is
In the case of SBS threshold, the CE of three kinds of different schemes (germnium doped fiber, mix aluminium optical fiber, mix aluminium optical fiber and germnium doped fiber is cascaded) is counted
Result is calculated to be shown in table 1.
The CE result of calculations of 1. 3 kinds of schemes of table
Experiment and result
1st, HNLF SBS threshold test
The SBS threshold of two sections of optical fiber is measured first, to determine input power.Utilize the experimental design measurement shown in Fig. 4
Input signal passes through reflection power during HNLF and the transimission power of output.In figure, optical circulator is used for exporting reflected light, and
Light power meter is then for measuring received transmission light and reflected optical power.
In the experiment of test SBS threshold, two sections of HNLF incident power is constantly adjusted respectively, its output end is recorded
Transimission power and the reflection power measured at circulator, and drawn out respectively by round dot and point institute of side in Fig. 5 (a) and (b)
The curve of expression.It can be seen from curve in figure when input power not yet reaches SBS threshold, the transimission power of output end with
The linear growth of input power, in this case, SBS scatterings almost can be ignored.When input power reaches SBS thresholds
During value, with the increase of incident power, contrast and transimission power, it can be found that power attenuation ratio increases.With further
Increase input power, optical power loss can continue to increase, until power output reaches a stable value.When power continues to increase
When, these increased input powers are almost all reflected back because of SBS effects.As seen from Figure 5,150m mixes aluminium HNLF's
SBS threshold is about 28dBm, and the SBS threshold that 100m mixes germanium HNLF is then 22dBm.
2nd, the measurement of wavelength shifter conversion efficiency
The experimental configuration of AOWC measures conversion efficiency from tunable light source (TLS1) as shown in fig. 6, send out first
The continuous light (CW) projected is amplified as signal via erbium-doped optical fiber amplifier EDFA 1 and by optical band pass filter
(OBPF1) spontaneous emission noise is filtered out.Another continuous light sent by tunable light source (TLS2) is via identical process conduct
Pump light.Flashlight and pump light are passed through 30：70 coupler (flashlight accounts for 30%, pump light account for 70%) input together to
In two sections of HNLF being concatenated together.Optoisolator (Isolator) in figure be used for preventing EDFA because SBS and caused by damage.Most
Afterwards, monitoring HNLF input and output spectrum and its conversion efficiency is measured by spectrometer (OSA).
During measures conversion efficiency, the signal light power that will enter into HNLF is set to 5dBm, and pump light
Power then changes to 26.7dBm from 22.7dBm.What Fig. 7 was shown is exactly when pump power is respectively 22.7dBm and 26.7dBm
HNLF input and output spectrum.Wherein pump wavelength is set to 1550nm, " CW1 ", " CW2 ", " CW3 ", " CW4 ",
" CW5 " is the letter at setting 1535nm, 1540nm, 1545nm, 1552.5nm, 1557.5nm and 1562.5nm respectively with " CW6 "
What number light, and " CW1 " ", " CW2 ' ", " CW3 ' ", " CW4 ' ", " CW5 ' " and " CW6 ' " were then represented is the letter after corresponding conversion
Number.Difference power before and after being changed in figure by measurement signal, can be derived that the conversion efficiency at different wave length.Actually measured
The efficiency curve that conversion efficiency curve is obtained with computer sim- ulation is represented in fig. 8 with dotted line and solid line respectively.Due to EDFA with
The reason for fibre-optical dispersion, causes experimental result slightly has to fluctuate, it is contemplated that the loss of the presence such as device terminal to survey in experiment
The CE outlines obtained are less than theoretical simulation value, but are matched substantially with computer sim- ulation result.Experiment can be with coincideing for simulation result
Proof can realize this higher conversion efficiency of -3.1dB under the support of low insertion loss device.
3rd, the test of conversion signal performance
In order to assess the performance of conversion signal, tested with the continuous light before 25Gb/s QPSK signals substitution.
AOWC structure is as shown in Figure 9.Pass through the Mach zehnder modulators (MZM) in figure and random waveform maker
(AWG) the 25Gb/s QPSK signals needed for producing.Adjustable attenuator (VOA) is used for adjusting with semiconductor optical amplifier (SOA) in figure
The OSNR (OSNR) of entire signal light, coherent receiver (Rx) is the bit error rate (BER) for test signal, constellation in addition
Figure.
Be shown in Figure 10 wavelength be respectively 1535nm, 1545nm and 1557.5nm input signal (be designated as BTB letter
Number) planisphere of its corresponding conversion signal (wavelength is respectively at 1565nm, 1555nm and 1542.5nm).By contrast,
Both show much the same performance, and also very close (BTB signals are 7% to their error vector magnitude (EVM), are turned in addition
Signal is changed for 8%).
In addition, by adjusting VOA, the OSNR of signal is changed, so as to be capable of the BER of measurement signal at receiving terminal.BTB
The ber curve of signal and conversion signal, is shown in Figure 11.It can be seen from the figure that, the power attenuation caused due to wavelength convert is very
It is small, when BER is 10-5During series, the power attenuation of conversion signal can be less than 0.5dB level.
In summary, the utility model proposes the aluminium HNLF and 100m that mixes 150m mix germanium HNLF and be concatenated together realizing
Without using the pumping dither technique of any raising SBS threshold in the AOWC scheme of high conversion efficiency, the program,
The conversion efficiency of -8dB (- 3.1dB can be realized in theory) is can be realized as using only commercial HNLF.In addition, to 25Gb/s's
After QPSK signals are changed, it is measured 10-5Power attenuation during series BER can be less than 0.5dB level.
Described above is only preferred embodiment of the present utility model, is not limited to the utility model, it is noted that
For those skilled in the art, on the premise of the utility model technical principle is not departed from, it can also do
Go out some improvement and modification, these improvement and modification also should be regarded as protection domain of the present utility model.
Claims (10)
1. a kind of AOWC, it is characterised in that：Including the transmitting terminal and receiving terminal connected by optical fiber, wherein
- the transmitting terminal will flashlight with inputting the optical fiber after coupling pump light；
What-the optical fiber included cascade mixes aluminium optical fiber and germnium doped fiber, and it receives and guided as described in being exported the transmitting terminal
Flashlight and pump light, and the nonlinear optical phenomena produced using the optical fiber when guiding the flashlight with pump light come
Produce conversion light；
- the receiving terminal receives the conversion light of the optical fiber output.
2. AOWC according to claim 1, it is characterised in that：The length for mixing aluminium optical fiber and germnium doped fiber
Degree is than being 3:2.
3. AOWC according to claim 1, it is characterised in that：The transmitting terminal is by the flashlight and pump
Pu light is with 3：The optical fiber is inputted after 7 ratio coupling.
4. AOWC according to claim 3, it is characterised in that：The input power of the pump light is described
Mix the SBS threshold of aluminium optical fiber.
5. the AOWC according to claim any one of 1-4, it is characterised in that：The transmitting terminal includes signal
Light source and pump light source, the signal optical source is with pump light source including the tunable laser sources being sequentially connected, amplifier, light belt
Bandpass filter and Polarization Controller.
6. AOWC according to claim 5, it is characterised in that：The amplifier is Erbium-doped fiber amplifier
Device.
7. AOWC according to claim 5, it is characterised in that：Between the transmitting terminal and the optical fiber also
It is connected with optoisolator.
8. AOWC according to claim 5, it is characterised in that：Between the optical fiber and the receiving terminal also
It is connected with optical band pass filter.
9. AOWC according to claim 8, it is characterised in that：The receiving terminal is the test conversion light
The coherent receiver of signal error rate and planisphere.
10. AOWC according to claim 8, it is characterised in that：The optical band pass filter with it is described
Adjustable attenuator and semiconductor optical amplifier can be also sequentially connected between receiving terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720299492.8U CN206618934U (en) | 2017-03-24 | 2017-03-24 | Aowc |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720299492.8U CN206618934U (en) | 2017-03-24 | 2017-03-24 | Aowc |
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| Publication Number | Publication Date |
|---|---|
| CN206618934U true CN206618934U (en) | 2017-11-07 |
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ID=60234009
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720299492.8U Expired - Fee Related CN206618934U (en) | 2017-03-24 | 2017-03-24 | Aowc |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106918972A (en) * | 2017-03-24 | 2017-07-04 | 苏州大学 | Aowc |
-
2017
- 2017-03-24 CN CN201720299492.8U patent/CN206618934U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106918972A (en) * | 2017-03-24 | 2017-07-04 | 苏州大学 | Aowc |
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| GR01 | Patent grant | ||
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Granted publication date: 20171107 Termination date: 20200324 |