CN107645338B - A kind of full plain edge of configurable optical signal is along detection system - Google Patents
A kind of full plain edge of configurable optical signal is along detection system Download PDFInfo
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- CN107645338B CN107645338B CN201710997584.8A CN201710997584A CN107645338B CN 107645338 B CN107645338 B CN 107645338B CN 201710997584 A CN201710997584 A CN 201710997584A CN 107645338 B CN107645338 B CN 107645338B
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Abstract
The present invention discloses a kind of full plain edge of configurable optical signal along detection system, the first erbium-doped fiber amplifier, for pump light signals power amplification；Adjustable optical attenuator, the power for the amplified pump light signals of regulation power；First fiber delay line and the second fiber delay line are used to adjust the relative time delay amount of pump light signals and the first reverse phase optical signal, and it is the transition time of NRZ optical signal that pump light signals, which are shifted to an earlier date τ or delay τ, τ relative to the propagation time of the first reverse phase optical signal,；Wavelength division multiplexer, for pump light signals and the first reverse phase optical signal to be coupled into optical signal all the way；Highly nonlinear optical fiber obtains the first ideler frequency light for generating degeneration four-wave mixing nonlinear effect under the action of optical signal after coupling；First optical band pass filter obtains the first edge pulse for extracting the first ideler frequency light.The present invention uses the principle of four-wave mixing, and delay is introduced between two paths of signals, can flexibly obtain rising edge, failing edge or obtain double edges.
Description
Technical field
The invention belongs to the all-optical signal processing of high speed signal and nonlinear optical technology fields, more particularly, to one
The configurable full plain edge of optical signal of kind is along detection system.
Background technique
Optic communication is one of present information, the most important mode of transmission, just towards ultrahigh speed, large capacity, big broadband, it is long away from
From, low cost direction advance.Full light Edge check is a kind of all-optical signal processing technology, for detecting nonreturn to zero code (Non-
Return to Zero, NRZ) signal rising edge and failing edge, can be used as trigger signal in photonic computer, enabled letter
Number or the rate for detecting optical signal.All-optical signal processing based on four-wave mixing has the reaction speed of femtosecond magnitude,
It can satisfy tens the G even signal processing of G up to a hundred.And wavelength convert may be implemented in four-wave mixing, is imitated by four-wave mixing
New frequency component should be can produce.By taking degeneration four-wave mixing process as an example, the frequency for injecting pump light is ωp, signal optical frequency
Rate is ωc, then it is ω that four-wave mixing process, which produces frequency,i=2 ωp-ωcTarget light, realize wavelength convert.
Existing All-optical signal Edge Detection majority be using annular or interference structure, by wavelength it is identical but believe
Number have dislocation, the two ways of optical signals of phase by pi is coupled, so that lap interferes cancellation, what is left is exactly
Edge signal, but structure makes system extremely complex and needs additional stabilizing measures to eliminate extraneous interference in this；
Or using notch filter by DC component and low frequency component to being filtered, remaining high fdrequency component be exactly corresponding rising edge and
Failing edge signal, but this method is limited to the spectral shape and bandwidth of notch filter.There are also one is non-thread using height
The self phase modulation (Self-phase modulation effect, SPM) of property optical fiber or semiconductor optical amplifier, when
When the biggish NRZ optical signal of power ratio is propagated in optical fiber or semiconductor optical amplifier, in the rising edge of NRZ optical signal
With falling edge meeting occurrence frequency chirp, chirp component extraction can be come out using disharmonious filtering device, what is obtained is exactly edge
Pulse signal, but this method is limited by the bandwidth of filter and the mismatching angle of filter.And above scheme is most
Rising edge, failing edge or simultaneously two edges of detection cannot flexibly be detected.
To sum up, existing All-optical signal Edge Detection system cannot flexibly detect NRZ optical signal rising edge, failing edge
Or two edges are detected simultaneously.
Summary of the invention
In view of the drawbacks of the prior art, it is an object of the invention to solve existing All-optical signal Edge Detection system not
NRZ optical signal rising edge can flexibly be detected, failing edge or the technical issues of detect two edges simultaneously.
To achieve the above object, the present invention provides a kind of full plain edge of configurable optical signal along detection system, comprising: first
Erbium-doped fiber amplifier, adjustable optical attenuator, the first fiber delay line, the second fiber delay line, wavelength division multiplexer, high non-linearity
Optical fiber and the first optical band pass filter.
First erbium-doped fiber amplifier, for the power amplification to pump light signals.
The adjustable optical attenuator, for adjusting the power of the pump light signals after the power amplification.
First fiber delay line accesses the pump light signals after the power regulation of the adjustable optical attenuator output.
The first reverse phase optical signal of the second fiber delay line access, the first reverse phase optical signal and pump light signals
Wavelength is different and signal is overturn；Wherein, signal overturning refers to that inside digital signal, " 1 " is exactly that signal turns over relative to " 0 "
Turn.
First fiber delay line and the second fiber delay line are for adjusting pump light signals and the first reverse phase optical signal
Relative time delay amount, pump light signals are shifted to an earlier date into τ relative to the propagation time of the first reverse phase optical signal, or by pump light signals phase
Propagation time delay τ, τ for the first reverse phase optical signal are the transition time of nonreturn to zero code NRZ optical signal.
The wavelength division multiplexer, for being coupled into the pump light signals and the first reverse phase optical signal that change relative time delay amount
Optical signal all the way, and the white Gaussian noise in filtering pump light signal and the first reverse phase optical signal.
The highly nonlinear optical fiber, for being generated under the action of pump light signals and the first reverse phase optical signal after coupling
Degeneration four-wave mixing nonlinear effect obtains the first ideler frequency light.
First optical band pass filter, the first ideler frequency light for will generate in highly nonlinear optical fiber are extracted, are obtained
To the pulse of desired first edge, when pump light signals shift to an earlier date τ relative to the propagation time of the first reverse phase optical signal, described
It is on one side rising edge pulse along pulse, it is described as propagation time delay τ of the pump light signals relative to the first reverse phase optical signal
First edge pulse is failing edge pulse, the wavelength phase of the central wavelength and the first ideler frequency light of first optical band pass filter
Together.
Optionally, the system further include: third fiber delay line, the second optical band pass filter, the 4th fiber delay line with
And first coupler.
The second reverse phase optical signal of the third fiber delay line access, the second reverse phase optical signal and pump light signals
Wavelength is different and signal is overturn, and the second reverse phase optical signal is different from the wavelength of the first reverse phase optical signal.
First fiber delay line and third fiber delay line are for adjusting pump light signals and the second reverse phase optical signal
Relative time delay amount, when pump light signals shift to an earlier date τ relative to the propagation time of the first reverse phase optical signal, the pump light signals
Propagation time delay τ relative to the second reverse phase optical signal；When propagation of the pump light signals relative to the first reverse phase optical signal
Between postpone τ when, the pump light signals shift to an earlier date τ relative to the propagation time of the second reverse phase optical signal.
The wavelength division multiplexer, for being coupled into the pump light signals and the second reverse phase optical signal that change relative time delay amount
Optical signal all the way, and the white Gaussian noise in filtering pump light signal and the second reverse phase optical signal.
The highly nonlinear optical fiber, for being generated under the action of pump light signals and the second reverse phase optical signal after coupling
Degeneration four-wave mixing nonlinear effect obtains the second ideler frequency light.
Second optical band pass filter, the second ideler frequency light for will generate in highly nonlinear optical fiber are extracted, are obtained
To the pulse of desired second edge, when the first edge pulse is rising edge pulse, second edge pulse is to decline along the pulse
Punching；When the first edge pulse is failing edge pulse, second edge pulse is rising edge pulse, the logical filter of second light belt
The central wavelength of wave device is identical as the wavelength of the second ideler frequency light.
4th fiber delay line, for being delayed to the second edge pulse.
First coupler is obtained for coupling the second edge pulse after the first edge pulse and delay
The pulse of third edge, third edge pulse include simultaneously rising edge pulse and failing edge pulse.
Optionally, system further include: first laser device, second laser, the second coupler, the second Erbium-doped fiber amplifier
Device and the first semiconductor optical amplifier.
The first laser device, for generating pump light signals.
The second laser, for generating laser source of the transmitting continuous laser as the first reverse phase optical signal.
Second coupler is used to the pump light signals that first laser device generates being divided into the equal first via of optical power
Pump light signals and the second tunnel pump light signals, the pump light signals that first erbium-doped fiber amplifier carries out power amplification are
The first via pump light signals.
Second erbium-doped fiber amplifier, for carrying out power amplification to the second tunnel pump light signals.
First semiconductor optical amplifier, the continuous laser that the second laser for receiving positive input generates
The second tunnel pump light signals after the power amplification reversely inputted, in the first semiconductor optical amplifier, the second road pump light
Signal generates cross-gain modulation to the continuous laser of forward direction input, obtains the first reverse phase optical signal.
Optionally, system further include: third laser, third coupler and the second semiconductor optical amplifier；
The third laser, for generating laser source of the transmitting continuous laser as the second reverse phase optical signal.
The third coupler is used to the second tunnel pump light signals after power amplification being divided into the equal third of optical power
Road pump light signals and the 4th tunnel pump light signals, the Pu optical signal for being reversely input to the first semiconductor optical amplifier is described the
Three tunnel pump light signals.
Second semiconductor optical amplifier, the continuous laser that the third laser for receiving positive input generates
The 4th tunnel pump light signals reversely inputted, in the second semiconductor optical amplifier, the 4th tunnel pump light signals are to just
Cross-gain modulation is generated to the continuous laser of input, obtains the second reverse phase optical signal.
Optionally, system further include: Polarization Controller；
The Polarization Controller is for adjusting the pump light signals being input in highly nonlinear optical fiber and the first reverse phase light letter
Number polarization state, and/or for adjusting the inclined of the pump light signals being input in highly nonlinear optical fiber and the second reverse phase optical signal
Polarization state, to obtain optimal four-wave mixing transfer efficiency.
Optionally, the first ideler frequency light and the second ideler frequency light are the edge pulse of nonreturn to zero code NRZ signal.
Optionally, the wavelength X for the ideler frequency light that four-wave mixing effect generatesiIt is determined by following formula；
Wherein, λpFor the wavelength and λ of pump lightcFor the wavelength of reverse phase optical signal, work as λcFor the wavelength of the first reverse phase optical signal
When, wavelength XiThe wavelength of corresponding first ideler frequency light, works as wavelength XcFor the second reverse phase optical signal wavelength when, λiCorresponding second ideler frequency
The wavelength of light.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, have below beneficial to effect
Fruit:
The present invention uses the principle of four-wave mixing, by introducing between pump light signals and reverse phase optical signal two paths of signals
Delay appropriate can flexibly obtain NRZ optical signal rising edge or failing edge, and utilize two-way reverse phase optical signal, fiber delay time
And coupler obtains double edges simultaneously.
Detailed description of the invention
Fig. 1 is the full plain edge of optical signal provided by the invention LD (Laser Device) along detection system structural block diagram, figure
It is laser, MZM (Mach-Zehnder Modulator) is MZ Mach-Zehnder, BPG (Bit Pattern
It Generator) be pattern generator, SOA (Semiconductor Optical Amplifiers) is semiconductor optical amplifier,
ISO (Isolator) is isolator, and Circulator is circulator, and EDFA (Erbium doped fiber amplifier) is
Erbium-doped fiber amplifier, VOA (Adjustable optical attenuator) is adjustable optical attenuator, PC
(Polarization controller) is Polarization Controller, and ODL (optical delay line) is fiber delay line,
HNLF (High nonlinear fiber) is highly nonlinear optical fiber, and BPF (Optical bandpass filter) is that light belt is logical
Filter, PD (Photodetector) are optical detectors, and OSC (Oscilloscope) is oscillograph, MUX (multiplexer)
It is multiplexer, OC (Optical Coupler) is coupler；
Fig. 2 (a) is the schematic diagram provided by the invention that rising edge pulse is obtained using four-wave mixing；
Fig. 2 (b) is the schematic diagram provided by the invention that failing edge pulse is obtained using four-wave mixing；
Fig. 2 (c) is the schematic diagram provided by the invention for obtaining rising edge and failing edge pulse simultaneously using four-wave mixing.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
In view of the drawbacks of the prior art, the present invention provides a kind of full plain edges of the optical signal based on four-wave mixing along detection system
System, its object is to improve the flexibility of Edge check, it is intended to which structure is complicated in the prior art for solution, has a single function, Ke Yishi
Now flexibly detect single edge or two edges.
Fig. 1 is the full plain edge of optical signal provided by the invention along detection system structural block diagram, as shown in Figure 1, comprising: first swashs
Light device LD1, second laser LD2, third laser LD3, the first erbium-doped optical fiber amplifier EDFA 1, the second Erbium-doped fiber amplifier
Device EDFA2, first annular device Circulator1, the second circulator Circulator2, adjustable optical attenuator VOA, the first optical fiber
Delay line ODL1, the second fiber delay line ODL2, third fiber delay line ODL3, wavelength division multiplexer MUX, highly nonlinear optical fiber
HNLF, the first semiconductor optical amplifier SOA1, the second semiconductor optical amplifier SOA2, the first optical band pass filter BPF1, second
Optical band pass filter BPF2, the first coupler OC1, the second coupler OC2, third coupler OC3, the 4th coupler OC4, light are visited
Survey device PD and oscillograph OSC, the first Polarization Controller PC1, the second Polarization Controller PC2, third Polarization Controller PC3.
First laser device LD1, second laser LD2 and third laser LD3 are respectively as pump light signals λp, first
Reverse phase optical signal λc1And the second reverse phase optical signal λc2Laser source.
Wherein, the laser for the narrow linewidth that first laser device LD1 is generated is input to MZ Mach-Zehnder MZM and is modulated
To the pump light signals of NRZ format.
First erbium-doped optical fiber amplifier EDFA 1 is for the power amplification to pump light signals.
Adjustable optical attenuator VOA is used for the power of the amplified pump light signals of regulation power, to obtain preferable four wave
It is mixed luminous efficiency.
First fiber delay line ODL1 accesses the pump light signals after the power regulation of adjustable optical attenuator VOA output.
Second fiber delay line ODL2 accesses the first reverse phase optical signal, the wavelength of the first reverse phase optical signal and pump light signals
Different and signal overturns (λp≠λc1)；Wherein, signal overturning refers to that inside digital signal, " 1 " is exactly relatively signal with " 0 "
Overturning.
First fiber delay line ODL1 and the second fiber delay line ODL2 is for adjusting pump light signals and the first reverse phase light
The relative time delay amount of signal, the propagation time by pump light signals relative to the first reverse phase optical signal shifts to an earlier date τ, or pump light is believed
Propagation time delay τ number relative to the first reverse phase optical signal, τ is the transition time of nonreturn to zero code NRZ optical signal.
Specifically, the region that four-wave mixing occurs is exactly if the transition time of the amount of delay and NRZ signal that introduce is suitable
The region of pump light signals and the overlapping of reverse phase optical signal.Further, time offset τ is usually the bit of a NRZ signal
25% or so of period.
The pump light signals and the first reverse phase optical signal that wavelength division multiplexer MUX is used to that relative time delay amount will to be changed are coupled into one
Road optical signal, and the white Gaussian noise in filtering pump light signal and the first reverse phase optical signal.
Highly nonlinear optical fiber HNLF is used to generate under the action of pump light signals and the first reverse phase optical signal after coupling
Degeneration four-wave mixing nonlinear effect obtains the first ideler frequency light.
First optical band pass filter BPF1 is obtained for extracting the first ideler frequency light generated in highly nonlinear optical fiber
The pulse of desired first edge, when pump light signals shift to an earlier date τ relative to the propagation time of the first reverse phase optical signal, the first edge
Pulse is rising edge pulse, as shown in Fig. 2 (a), as propagation time delay τ of the pump light signals relative to the first reverse phase optical signal
When, the first edge pulse be failing edge pulse, as shown in Fig. 2 (b), the central wavelength of the first optical band pass filter BPF1 and
The wavelength of first ideler frequency light is identical.
Third fiber delay line ODL3 accesses the second reverse phase optical signal, the wavelength of the second reverse phase optical signal and pump light signals
Different and signal is overturn, the second reverse phase optical signal (λ different from the wavelength of the first reverse phase optical signalc1≠λc2)。
First fiber delay line ODL1 and third fiber delay line ODL3 is for adjusting pump light signals and the second reverse phase light
The relative time delay amount of signal, when pump light signals shift to an earlier date τ relative to the propagation time of the first reverse phase optical signal, pump light signals
Propagation time delay τ relative to the second reverse phase optical signal；When propagation of the pump light signals relative to the first reverse phase optical signal
Between postpone τ when, pump light signals shift to an earlier date τ relative to the propagation time of the second reverse phase optical signal.
The pump light signals and the second reverse phase optical signal that wavelength division multiplexer MUX is used to that relative time delay amount will to be changed are coupled into one
Road optical signal, and filtering pump light signal neutralizes the white Gaussian noise of the second reverse phase optical signal.
Highly nonlinear optical fiber HNLF is used to generate under the action of pump light signals and the second reverse phase optical signal after coupling
Degeneration four-wave mixing nonlinear effect obtains the second ideler frequency light.
Second optical band pass filter BPF2 is obtained for extracting the second ideler frequency light generated in highly nonlinear optical fiber
The pulse of desired second edge, when the first edge pulse is rising edge pulse, second edge pulse is failing edge pulse；
When the first edge pulse is failing edge pulse, second edge pulse is rising edge pulse, the second optical band pass filter
The central wavelength of BPF2 is identical as the wavelength of the second ideler frequency light.
4th fiber delay line ODL4 is for being delayed to the second edge pulse.
First coupler OC1 is used to couple the second edge pulse after the first edge pulse and delay, obtains the
Three edge pulses, the pulse of third edge includes simultaneously rising edge pulse and failing edge pulse, as shown in Fig. 2 (c).Wherein, Fig. 2
(a) existing rising edge pulse in ideler frequency light in-Fig. 2 (c), and have failing edge pulse, and the corresponding wavelength of rising edge pulse
Ideler frequency light, failing edge corresponds to the ideler frequency light of another wavelength.
Second coupler OC2 is used to for the pump light signals that first laser device generates being divided into the equal first via of optical power and pumps
Pu optical signal and the second tunnel pump light signals, the pump light signals that the first erbium-doped optical fiber amplifier EDFA 1 carries out power amplification are
The first via pump light signals.
Second erbium-doped optical fiber amplifier EDFA 2 is used to carry out power amplification to the second tunnel pump light signals.
Continuous laser that the second laser LD2 that first semiconductor optical amplifier SOA1 is used to receive positive input is generated and
The second tunnel pump light signals after the power amplification reversely inputted, in the first semiconductor optical amplifier, the second road pump light letter
Number to forward direction input continuous laser generate cross-gain modulation, obtain the first reverse phase optical signal.
Third coupler OC3 is used to the second tunnel pump light signals after power amplification being divided into the equal third road of optical power
Pump light signals and the 4th tunnel pump light signals, the Pu optical signal for being reversely input to the first semiconductor optical amplifier SOA1 is third
Road pump light signals.
Continuous laser that the third laser that second semiconductor optical amplifier SOA2 is used to receive positive input generates and anti-
To the 4th tunnel pump light signals of input, in the second semiconductor optical amplifier, the 4th tunnel pump light signals are to positive defeated
The continuous laser entered generates cross-gain modulation, obtains the second reverse phase optical signal.
Specifically, the input and output of circulator Circulator have a single direction, and optical signal is from circulator
1 port of Circulator1 inputs, the output of 2 ports；It is inputted by 2 ports, is just exported by 3 ports.
Wherein, third road pump light signals from 1 port of first annular device Circulator1 input, from 2 ports export into
Enter the first semiconductor optical amplifier SOA1, the light of forward direction input SOA1 in SOA1 after exporting from first annular device
2 ports of Circulator1 enter, and are exported by 3 ports of first annular device Circulator1, obtain the first reverse phase optical signal.
4th tunnel pump light signals are inputted from 1 port of the second circulator Circulator2, and from 2 ports, output enters the second semiconductor
The light of image intensifer SOA2, the second semiconductor optical amplifier SOA2 of forward direction input are exported from the second semiconductor optical amplifier SOA2
Enter afterwards from 2 ports of circulator Circulator2, is exported by 3 ports of circulator Circulator2, obtain the second reverse phase
Optical signal.
4th coupler OC4 is used to the first ideler frequency light and the second ideler frequency light being divided into two-way, is separately input to the first light belt
Bandpass filter BPF1 and the second optical band pass filter BPF2.Wherein, optical detector PD may include multiple, be respectively used to detection first
Edge pulse, the second edge pulse and the pulse of third edge.
The first edge pulse, the second edge pulse and the third edge pulse letter that oscillograph OSC is used to extract
It number shows.
Optionally, system further include: Polarization Controller PC；Polarization Controller PC is input to high non-linearity light for adjusting
The polarization state of pump light signals and the first reverse phase optical signal in fine HNLF, and/or highly nonlinear optical fiber is input to for adjusting
The polarization state of pump light signals and the second reverse phase optical signal in HNLF, to obtain optimal four-wave mixing transfer efficiency.Its
In, as shown in Figure 1, Polarization Controller PC may include PC1, PC2 and PC3, respectively correspond pump light signals, the first reverse phase light letter
Number and the second reverse phase optical signal optical path, adjust the polarization state of this three roads optical signal respectively.
Optionally, the wavelength X for the ideler frequency light that four-wave mixing effect generatesiIt is determined by following formula；
Wherein, λpFor the wavelength and λ of pump lightcFor the wavelength of reverse phase optical signal, work as wavelength XcFor the first reverse phase optical signal
Wavelength Xc1When, λiThe wavelength X of corresponding first ideler frequency lighti1, work as λcFor the wavelength X of the second reverse phase optical signalc2, wavelength XiCorresponding second
The wavelength X of ideler frequency lighti2。
Optionally, the first ideler frequency light λi1With the second ideler frequency light λi1For the edge pulse of nonreturn to zero code NRZ signal.
In a specific example, the full plain edge of optical signal provided by the invention includes following several functions along detection system
It divides:
1, the generation and power regulation of pump signal light and inversion signal light: the narrow linewidth that laser LD1 is generated swashs
Light is input to the pump signal light that MZ Mach-Zehnder is modulated to obtain NRZ format；Obtained pump light signals are coupled
Device OC2 is divided into two-way, will be input into highly nonlinear optical fiber all the way, is reversed is input to semiconductor optical amplifier SOA1 all the way；
In addition laser LD2 is for generating the different laser of wavelength all the way, and forward direction is input to semiconductor optical amplifier, in semiconductor
The cross-gain modulation of pump signal light in image intensifer by inverse injection obtains reverse phase optical signal；Obtained pumping
The optical power of optical signal and reverse phase optical signal is by the adjusting of erbium-doped optical fiber amplifier EDFA 1 and adjustable optical attenuator VOA with full
The phase-matching condition that sufficient four-wave mixing effect needs.
2, the generation of edge pulse: pump light signals and reverse phase optical signal are first inputted to Polarization Controller PC1 and PC2
It adjusts polarization state and then adjusts the transfer efficiency of four-wave mixing in highly nonlinear optical fiber；It, will be from PC in order to generate edge pulse
The pump light signals and reverse phase optical signal of output are input to fiber delay line ODL1 and ODL2, and fiber delay line ODL is to reverse phase light
The time offset that signal introduces is suitable with the transition time τ of NRZ signal.If obtaining rising edge pulse, reverse phase light letter
Number relative to pump light signals postpone τ；If obtaining failing edge pulse, reverse phase optical signal shifts to an earlier date relative to pump light signals
τ.Pump light signals and reverse phase optical signal are coupled into highly nonlinear optical fiber HNLF by a wavelength division multiplexer MUX.Wavelength-division is multiple
It uses device that two paths of signals optocoupler is combined into light all the way as coupler, also filters out erbium-doped fiber amplifier production as bandpass filter
Raw spontaneous emission noise.
3, the unilateral extraction along pulse: on the ideler frequency light that the degeneration four-wave mixing that occurs in highly nonlinear optical fiber generates is exactly
It rises along pulse or failing edge pulse.The wavelength X of ideler frequency lightiIt is λ by wavelengthpPump light signals and wavelength be λcReverse phase light
Signal deciding is determined by following formula；
Terminating central wavelength optical band pass filter identical with ideler frequency optical wavelength in optical fiber output can be by edge
DISCHARGE PULSES EXTRACTION comes out.
4, the bilateral extraction along pulse: if what is injected into highly nonlinear optical fiber be two-way wavelength is respectively λc1And λc2
Reverse phase optical signal, with two central wavelengths be λ in fiber-optic outputi1And λi2Light belt pass filter corresponding with ideler frequency optical wavelength
After device extracts rising edge and failing edge, will wherein be input to all the way after fiber delay line ODL4 again by two-way pulse together
It is coupled as light all the way with coupler OC1, can see rising edge pulse and failing edge pulse and original simultaneously on oscillograph OSC
NRZ signal is aligned well.
The invention proposes a kind of full plain edges of configurable optical signal along detection system, by by superpower pump signal
Light and the inversion signal optical coupling of suitable time-delay is introduced into occurring four-wave mixing in highly nonlinear optical fiber, then with light bandpass filtering
Device extracts the ideler frequency light of generation to obtain desired edge pulse.Specifically, the amount of delay of introducing and crossing for NRZ signal
More the time is suitable, and the region that four-wave mixing occurs is exactly the region of pump light signals and the overlapping of reverse phase optical signal.
More than, the only preferable specific embodiment of the application, but the protection scope of the application is not limited thereto, and it is any
Within the technical scope of the present application, any changes or substitutions that can be easily thought of by those familiar with the art, all answers
Cover within the scope of protection of this application.Therefore, the protection scope of the application should be subject to the protection scope in claims.
Claims (7)
1. a kind of full plain edge of configurable optical signal is along detection system characterized by comprising the first erbium-doped fiber amplifier,
Adjustable optical attenuator, the first fiber delay line, the second fiber delay line, wavelength division multiplexer, highly nonlinear optical fiber and the first light
Bandpass filter；
First erbium-doped fiber amplifier, the power amplification for the pump light signals to NRZ format；
The adjustable optical attenuator, for adjusting the power of the pump light signals after the power amplification；
First fiber delay line accesses the pump light signals after the power regulation of the adjustable optical attenuator output；
Second fiber delay line accesses the first reverse phase optical signal, the wavelength of the first reverse phase optical signal and pump light signals
Different and signal is overturn；
First fiber delay line and the second fiber delay line are used to adjust the phase of pump light signals and the first reverse phase optical signal
To amount of delay, pump light signals are shifted to an earlier date into τ relative to the propagation time of the first reverse phase optical signal, or by pump light signals relative to
The propagation time delay τ, τ of first reverse phase optical signal are the transition time of nonreturn to zero code NRZ optical signal；
The wavelength division multiplexer, for being coupled into the pump light signals and the first reverse phase optical signal that change relative time delay amount all the way
Optical signal, and the white Gaussian noise in filtering pump light signal and the first reverse phase optical signal；
The highly nonlinear optical fiber, for generating degeneracy under the action of pump light signals and the first reverse phase optical signal after coupling
Four-wave mixing nonlinear effect obtains the first ideler frequency light；
First optical band pass filter, the first ideler frequency light for will generate in highly nonlinear optical fiber are extracted, must be expired
The the first edge pulse hoped, when pump light signals shift to an earlier date τ relative to the propagation time of the first reverse phase optical signal, first side
It is rising edge pulse along pulse, as propagation time delay τ of the pump light signals relative to the first reverse phase optical signal, described first
Edge pulse is failing edge pulse, and the central wavelength of first optical band pass filter is identical as the wavelength of the first ideler frequency light.
2. the full plain edge of optical signal according to claim 1 is along detection system, which is characterized in that further include: third optical fiber prolongs
When line, the second optical band pass filter, the 4th fiber delay line and the first coupler；
The third fiber delay line accesses the second reverse phase optical signal, the wavelength of the second reverse phase optical signal and pump light signals
Different and signal is overturn, and the second reverse phase optical signal is different from the wavelength of the first reverse phase optical signal；
First fiber delay line and third fiber delay line are used to adjust the phase of pump light signals and the second reverse phase optical signal
To amount of delay, when pump light signals shift to an earlier date τ relative to the propagation time of the first reverse phase optical signal, the pump light signals are opposite
In the propagation time delay τ of the second reverse phase optical signal；When pump light signals are prolonged relative to the propagation time of the first reverse phase optical signal
When slow τ, the pump light signals shift to an earlier date τ relative to the propagation time of the second reverse phase optical signal；
The wavelength division multiplexer, for being coupled into the pump light signals and the second reverse phase optical signal that change relative time delay amount all the way
Optical signal, and the white Gaussian noise in filtering pump light signal and the second reverse phase optical signal；
The highly nonlinear optical fiber, for generating degeneracy under the action of pump light signals and the second reverse phase optical signal after coupling
Four-wave mixing nonlinear effect obtains the second ideler frequency light；
Second optical band pass filter, the second ideler frequency light for will generate in highly nonlinear optical fiber are extracted, must be expired
The the second edge pulse hoped, when the first edge pulse is rising edge pulse, second edge pulse is failing edge pulse；When
When first edge pulse is failing edge pulse, second edge pulse is rising edge pulse, second optical band pass filter
Central wavelength it is identical as the wavelength of the second ideler frequency light；
4th fiber delay line, for being delayed to the second edge pulse；
First coupler obtains third for coupling the second edge pulse after the first edge pulse and delay
Edge pulse, third edge pulse include simultaneously rising edge pulse and failing edge pulse.
3. the full plain edge of optical signal according to claim 1 is along detection system, which is characterized in that further include: first laser device,
Second laser, the second coupler, the second erbium-doped fiber amplifier and the first semiconductor optical amplifier；
The first laser device, for generating pump light signals；
The second laser, for generating laser source of the transmitting continuous laser as the first reverse phase optical signal；
Second coupler is used to for the pump light signals that first laser device generates being divided into the equal first via of optical power and pumps
Optical signal and the second tunnel pump light signals, the pump light signals that first erbium-doped fiber amplifier carries out power amplification are described
First via pump light signals；
Second erbium-doped fiber amplifier, for carrying out power amplification to the second tunnel pump light signals；
First semiconductor optical amplifier, continuous laser that the second laser for receiving positive input generates and anti-
To the second tunnel pump light signals after the power amplification of input, in the first semiconductor optical amplifier, the second tunnel pump light signals
Cross-gain modulation is generated to the continuous laser of forward direction input, obtains the first reverse phase optical signal.
4. the full plain edge of optical signal according to claim 3 is along detection system, which is characterized in that further include: third laser,
Third coupler and the second semiconductor optical amplifier；
The third laser, for generating laser source of the transmitting continuous laser as the second reverse phase optical signal；
The third coupler is used to for the second tunnel pump light signals after power amplification being divided into the equal third road of optical power and pumps
Pu optical signal and the 4th tunnel pump light signals, the pump light signals for being reversely input to the first semiconductor optical amplifier are the third
Road pump light signals；
Second semiconductor optical amplifier, continuous laser that the third laser for receiving positive input generates and anti-
To the 4th tunnel pump light signals of input, in the second semiconductor optical amplifier, the 4th tunnel pump light signals are to positive defeated
The continuous laser entered generates cross-gain modulation, obtains the second reverse phase optical signal.
5. the full plain edge of optical signal according to claim 1 is along detection system, which is characterized in that further include: Polarization Controller；
The Polarization Controller is used to adjust the pump light signals being input in highly nonlinear optical fiber and the first reverse phase optical signal
Polarization state, and/or the polarization state for adjusting the pump light signals being input in highly nonlinear optical fiber and the second reverse phase optical signal.
6. the full plain edge of optical signal according to claim 2 is along detection system, which is characterized in that the first ideler frequency light and the second spare time
Frequency light is the edge pulse of nonreturn to zero code NRZ signal.
7. the full plain edge of optical signal according to any one of claims 1 to 5 is along detection system, which is characterized in that four-wave mixing
The wavelength X for the ideler frequency light that nonlinear effect generatesiIt is determined by following formula；
Wherein, λpFor the wavelength of pump light, λcFor the wavelength of reverse phase optical signal, work as λcFor the first reverse phase optical signal wavelength when, wave
Long λiThe wavelength of corresponding first ideler frequency light；Work as λcFor the second reverse phase optical signal wavelength when, wavelength XiThe wave of corresponding second ideler frequency light
It is long.
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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 |
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| WO2014139538A1 (en) * | 2013-03-14 | 2014-09-18 | Danmarks Tekniske Universitet | All-optical regeneration system for optical wavelength division multiplexed communication systems |
| 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 |
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