CN107070559B - A kind of full optical phase modulator - Google Patents
A kind of full optical phase modulator Download PDFInfo
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- CN107070559B CN107070559B CN201710205287.5A CN201710205287A CN107070559B CN 107070559 B CN107070559 B CN 107070559B CN 201710205287 A CN201710205287 A CN 201710205287A CN 107070559 B CN107070559 B CN 107070559B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
- H04B10/5059—Laser transmitters using external modulation using a feed-forward signal generated by analysing the optical or electrical input
- H04B10/50597—Laser transmitters using external modulation using a feed-forward signal generated by analysing the optical or electrical input to control the phase of the modulating signal
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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
- G02F1/35—Non-linear optics
- G02F1/3515—All-optical modulation, gating, switching, e.g. control of a light beam by another light beam
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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
- G02F2/00—Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light
- G02F2/004—Transferring the modulation of modulated light, i.e. transferring the information from one optical carrier of a first wavelength to a second optical carrier of a second wavelength, e.g. all-optical wavelength converter
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/54—Intensity modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/564—Power control
Abstract
The invention discloses a kind of full optical phase modulators, including differential balance signal forming unit and light phase modulation unit, light phase modulation unit include semiconductor optical amplifier；Differential balance signal forming unit, for being λ by wavelength1The optical signal of intensity modulated become two-way differential balance signal, this two-way differential balance signal respectively with detection light in the same direction, inverse injection semiconductor optical amplifier；This two-way differential balance signal is respectively that wavelength is λ1First via optical signal and wavelength be λ '1Radix-minus-one complement after the second road optical signal, the second road optical signal after first via optical signal and radix-minus-one complement radix-minus-one complement each other；Semiconductor optical amplifier generates Cross-phase Modulation for interacting according to two-way differential balance signal and the detection light for needing to be modulated.It is simple and easy to use that quickly tuning, structure can be achieved in the present invention.
Description
Technical field
The present invention relates to phase-modulator technical field, especially a kind of full optical phase modulator.
Background technique
Phase shift keyed signal is a kind of widely used modulation format of high speed optical communication system, including differential phase keying (DPSK) letter
Number (DPSK), four phase phase shift keyed signals (QPSK) and quadrature amplitude modulation signal (QAM) etc..With traffic rate
It is continuously improved, phase-shift keying (PSK) (PSK) signal becomes the mainstream technology of 40Gb/s, 100Gb/s or more high speed optical communication.Applying phase
It moves in the system of keying (PSK) signal, modulator and demodulator are two Primary Components.Known phase-shift keying (PSK) domestic and international at present
(PSK) modulator of signal is all based on the modulator of Electro-optical Modulation.
Based on Mach-Zeng Deer principle of interference lithium niobate (LiNbO3) electrooptic modulator, structure as shown in Figure 1.
It is the Mach-Zender interferometer (MZI) constituted on lithium columbate crystal surface with titanium diffused waveguide.Input light passes through one
Y type waveguide is divided into two-way, phase shift difference is generated by Electro-optical Modulation when by upper and lower two-way interfere arm, in another Y type waveguide
Interference superposition is carried out, output amplitude is related with the phase difference of two arms.Therefore, Output optical power is related with modulation voltage.For
The suitable operating point of selection other than modulation voltage will also add a DC offset voltage, to ensure to realize modulator
Different function.
It when realizing phase-modulation, needs direct current biasing operating point to be placed on zero point, controls voltage as bipolarity letter
Number, it can be obtained by the signal of [0, π] phase change in the output end of modulator.Currently, single pass 40Gb/s Electro-optical Modulation
Device mature (domestic electrooptic modulator still has unstable problem), but further increases the single-pass of electrooptic modulator
Road rate is difficult (here, not including being improved using rate caused by binary channels).Because with the increase of modulation rate,
It is required that the synchronous transfer in a manner of traveling wave of the electric signal and optical signal in modulator, and interelectrode capacity is very small, and it is difficult in technique
To accomplish.Especially when ultra-narrow light pulse is fs magnitude, Yao Liyong electrooptic modulator realizes fs grades of light modulation almost not
It is possible, do not simply fail to generate fs grades of electric pulse, and Electro-optical Modulation can not be carried out.So by fs grades of signal modulation
It is one of great demand of the following modulation technique to break through the rate limit of electrooptic modulator onto light.
Summary of the invention
A kind of full optical phase modulator is provided the technical problem to be solved by the present invention is to overcome the deficiencies in the prior art,
It is simple and easy to use that quickly tuning, structure can be achieved in the present invention.
The present invention uses following technical scheme to solve above-mentioned technical problem:
A kind of full optical phase modulator proposed according to the present invention, including differential balance signal forming unit and light phase tune
Unit processed, light phase modulation unit include semiconductor optical amplifier；Wherein,
Differential balance signal forming unit, for being λ by wavelength1The optical signal of intensity modulated become two-way differential balance
Signal, this two-way differential balance signal respectively with detection light in the same direction, inverse injection semiconductor optical amplifier；This two-way differential balance
Signal is respectively that wavelength is λ1First via optical signal and wavelength be λ1' radix-minus-one complement after the second road optical signal, first via optical signal
With the radix-minus-one complement each other of the second road optical signal after radix-minus-one complement；Wherein, | λ1-λ1' | < f, f are preset maximum wavelength phase difference, P1(t,
λ1)+P2(t,λ1′)≡P0, P1(t,λ1) be first via optical signal in time t power, P2(t,λ1') radix-minus-one complement in time t
The power of the second road optical signal afterwards, P0For constant；
Semiconductor optical amplifier, for being interacted according to two-way differential balance signal and the detection light for needing to be modulated,
Generate Cross-phase Modulation.
Scheme, differential balance signal forming unit are advanced optimized as a kind of full optical phase modulator of the present invention
Including photo-coupler, phase inverter, tunable delayer and optical power adjustment module；Wherein,
Photo-coupler, for the optical signal of externally input intensity modulated to be divided into two-way: first via optical signal and second
Road optical signal；
Tunable delayer, for postponing first via optical signal；
Phase inverter, for the second road optical signal to be become to the signal with the optical signal radix-minus-one complement of intensity modulated, after exporting radix-minus-one complement
The second road optical signal to optical power adjustment module；
Optical power adjustment module, for decaying or amplifying the power of the second road optical signal after radix-minus-one complement, so that after delay
First via optical signal and radix-minus-one complement after the sum of the power of the second road optical signal it is constant.
Scheme is advanced optimized as a kind of full optical phase modulator of the present invention, the photo-coupler is 1X2 light
Coupler, optical power adjustment module are tunable attenuator or amplifier.
Scheme is advanced optimized as a kind of full optical phase modulator of the present invention, phase inverter is multiple including the first wavelength-division
With coupler, local laser, the first semiconductor optical amplifier and the first optical filter, the wavelength of local laser is λ1′；
Wherein,
Local laser, for generating continuous light and outputting this to the first wave division multiplex coupler；
First wave division multiplex coupler, for synthesizing all the way the second road optical signal of continuous light and photo-coupler output
Signal, the second road optical signal to the first semiconductor optical amplifier after output combining；
First semiconductor optical amplifier, for generating cross-gain modulation to the second road optical signal after combining, so that defeated
The opposite in phase of the optical signal of the phase and intensity modulated of signal out, the second road optical signal after exporting radix-minus-one complement are filtered through the first light
It exports after device filtering to optical power adjustment module.
Scheme is advanced optimized as a kind of full optical phase modulator of the present invention, phase inverter includes the first ring of light row
Device, F-P laser and the first optical filter, the wavelength of F-P laser are λ1′；Wherein,
Second road optical signal of photo-coupler output reaches F-P laser through the first optical circulator；When being input to F-P laser
Usually for bloom, F-P laser is suppressed second road optical signal of device, is not shone；When the second road light for being input to F-P laser
Usually for low light, F-P laser starting of oscillation shines signal, so that the phase of the optical signal of F-P laser output swashs with F-P is input to
The opposite in phase of second road optical signal of light device, the optical signal of F-P laser output are the second road optical signal after radix-minus-one complement, radix-minus-one complement
The second road optical signal afterwards exports after the filtering of the first optical filter to optical power adjustment module.
Scheme is advanced optimized as a kind of full optical phase modulator of the present invention, light phase modulation unit further includes
Second wave division multiplex coupler and third wave division multiplex coupler, wherein
Second wave division multiplex coupler, for by first via optical signal with need the detection modulated photosynthetic for light all the way it is defeated
Out to semiconductor optical amplifier；
Third wave division multiplex coupler, for exporting the second road optical signal after radix-minus-one complement to semiconductor optical amplifier；
Semiconductor optical amplifier, for being interacted according to two-way differential balance signal and the detection light for needing to be modulated,
Cross-phase Modulation is generated, the optical signal after completing phase-modulation is filtered through third wave division multiplex coupler and exported.
Scheme is advanced optimized as a kind of full optical phase modulator of the present invention, light phase modulation unit further includes
Second wave division multiplex coupler, the second optical circulator and the second optical filter；Wherein,
Second wave division multiplex coupler, for by first via optical signal with need the detection modulated photosynthetic for light all the way it is defeated
Out to semiconductor optical amplifier；
Second optical circulator, for exporting second its first port of road optical signals input after radix-minus-one complement, second port
To semiconductor optical amplifier；
Semiconductor optical amplifier, for being interacted according to two-way differential balance signal and the detection light for needing to be modulated,
Cross-phase Modulation is generated, the second port input of the second optical circulator of optical signals after completing phase-modulation, third port
Output to the second optical filter exports.
Scheme is advanced optimized as a kind of full optical phase modulator of the present invention, the f is 50GHz.
The invention adopts the above technical scheme compared with prior art, has following technical effect that
(1) present invention breaks through the rate limit of current Electro-optical Modulation, and the modulation of fs magnitude optical signal may be implemented；
(2) present invention is in design without considering control light and detecting the stationary problem of light；
(3) present invention is easy to become one with the light source (laser) modulated；
(4) present invention can be used for carrying out optical signal the occasion of phase-modulation.
Detailed description of the invention
Fig. 1 is modulator structure schematic diagram in the prior art based on MZ interferometer structure；
Fig. 2 is overall structure diagram of the invention；
Fig. 3 is the structural schematic diagram of differential balance signal generation unit of the invention；
Fig. 4 is the structural schematic diagram of phase modulation unit of the invention；
Fig. 5 is the inverter structure schematic diagram used in the present invention based on SOA Cross-phase Modulation；
Fig. 6 is to be opened the light the inverter structure schematic diagram of state used in the present invention based on laser；
Fig. 7 is a kind of structural schematic diagram of the full optical phase modulator of fast tunable described in the embodiment of the present invention 1；
Fig. 8 is a kind of structural schematic diagram of the full optical phase modulator of fast tunable described in the embodiment of the present invention 2；
Fig. 9 is a kind of structural schematic diagram of the full optical phase modulator of fast tunable described in the embodiment of the present invention 3.
Specific embodiment
Technical solution of the present invention is described in further detail with reference to the accompanying drawing:
It is exactly to change Electro-optical Modulation as full light modulation the invention solves the approach for being previously mentioned problem in background technique.It is so-called complete
Optical phase modulator, refer to the injection device detects light under the action of the intensity type of external carrying information controls optical signal,
Its phase for exporting detection light changes with the Strength Changes of external control light, so that the information for controlling light reprinting detected
In the phase of light.It should be noted that control light should only be modulated the phase for detecting light, and the intensity for detecting light
It should be unaffected.
Full optical phase modulator has many good qualities compared with electrooptic modulator.Firstly, being adjusted inside full optical modulator
The signal and modulated signal of system are all light, as long as their wavelength is close, on the geometric scale of modulator (such as cm magnitude)
Dispersion be it is negligible, transmission speed is essentially identical, so being naturally synchronous.Secondly, being based on nonlinear full light tune
The problems such as device processed, response speed easily reach fs magnitude, and distributed capacitor inductance is also not present.Third, full light phase modulation
The active devices such as the light source (laser) used in device are integrated into which can be convenient with modulator device technique having the same
One miniature device, it is small in size.These essential advantages determine that only full optical modulator can satisfy the tune of super 100G system
Demand processed.What it is in view of current High Speed System use is all high-order coded format, so exploring towards the complete of high-order coded format
Optical modulator, with more important meaning.
The full optical phase modulator of fast tunable of the present invention, if Fig. 2 is overall structure diagram of the invention, packet
Include two parts: 1. differential balance signal forming unit；2. taking semiconductor optical amplifier (SOA) as the light phase tune of Primary Component
Unit processed.Principle is as follows: one wavelength of input is λ1Intensity modulated (OOK) signal Pin(λ1), usually non-return-to-zero (NRZ)
Code, initially enters differential balance signal forming unit, becomes two-way differential balance signal, power is respectively P1(t,λ1) and P2(t,
λ1'), wherein λ1≈λ1' or it is equal.So-called differential balance signal refers to that the sum of power of the two is constant, i.e. P1(t,λ1)+P2
(t,λ1′)≡P0(constant), and the two radix-minus-one complement (data of carrying are exactly the opposite), even P each other1(t,λ1) be " 1 " code when, P2
(t,λ1') it is " 0 " code, vice versa.Since the extinction ratio of actual NRZ code is a finite value, " 0 " code institute is not necessarily made excessive demands
Corresponding performance number one is set to zero.Meanwhile in order to generate radix-minus-one complement each other, need to tend not to make P using phase inverter1And P2Wave
Length is completely the same, may have some errors, that is, in P1(t,λ1) and P2(λ1') in only need λ1≈λ1', in the following description
In, we are no longer strictly distinguish λ1And λ1′.Two-way differential balance signal, respectively with by modulation light (detection light) in the same direction and
Inverse injection SOA, inside SOA, two-way differential balance signal and detection light interaction generate Cross-phase Modulation.
Theoretically, the gain in SOA transient process and phase change meet following three equation
In formula, P (z, τ) is the optical power of certain point z moment t inside SOA, when g (z, τ) is certain point inside SOA
The gain at quarter,For the phase of the inside SOA certain point moment complex amplitude, α is linewidth enhancement factor, in a certain range
It can be considered constant, EsatFor the saturation power of SOA, constant can be considered.Defining integration gainIt solves equation
Phase shift can be obtainedWhen the control light of inverse injection equal-wattage, g (τ) is equal, butThenIf static operating point is placed in pi/2, and makeIt can be obtained by [0, π] two states.The high-speed phase modulation for thereby realizing area of light, just as at a high speed
Electric signal goes modulation lithium niobate electrooptic modulator the same.
The differential wave of full optical phase modulator of the present invention forms part, as shown in figure 3, including an optical coupling
Device (CP), a tunable delayer, a phase inverter and a tunable attenuator.Wherein, the signal of the modulation of input
Light is divided into two-way by photo-coupler, directly becomes differential balance signal all the way by a delayer all the way；Another way is first
It first passes through a phase inverter, carries out operated in anti-phase, output signal and input signal radix-minus-one complement each other are followed by a tunable decaying
Device, another way of its output signal as differential balance signal.
Light phase modulation unit of the present invention, including a semiconductor optical amplifier (SOA), a wavelength-division multiplex coupling
Clutch, a circulator and a filter, such as Fig. 4.
The detection light P modulatedin(λ2) with differential balance control light P all the way1(t,λ1) closed via wave division multiplex coupler
As SOA is entered after a signal, the another way of differential balance controls light P2(t,λ1') first reach circulator 1 port, and from
The 2 ports output of circulator enters SOA, the detection light by phase-modulation exported from SOA, by 3 ports of circulator
Then output is the light of phase-modulation via a filter Filter output.
The phase inverter, can there are many structure, the most commonly used is utilizing semiconductor optical amplifier cross-gain modulation,
As shown in Figure 5.It includes a wave division multiplex coupler, a local laser LD (λ1'), wavelength is very close to input light
Wavelength, a semiconductor optical amplifier and a filter.When input signal is high level, for λ in SOA1′
The gain of light is smaller, and when input is low level, SOA is for λ1The gain of ' light is larger.In this way, the λ of output1' light is exactly defeated
Enter the radix-minus-one complement of light.
Another phase inverter is made of the local laser to work in switch state, and referring to Fig. 6, it includes one and goes in ring
Device, a laser and a filter.When input light is injected into local laser by a circulator, when it is low
For light usually (when namely injecting without ambient light), local laser starting of oscillation exports the flat λ of bloom1' light；Work as input light
Usually for bloom, local laser is under the locking of exterior light, not starting of oscillation, exports as close to 0 light.After filtering, obtain
Optical signal with input light radix-minus-one complement.Structure ratio Fig. 5 of Fig. 6 is succinct, but response speed is slightly slow.
The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.:
Embodiment 1
As shown in fig. 7, a kind of full optical phase modulator of fast tunable, including photo-coupler (CP), tunable delayer,
First semiconductor optical amplifier (SOA1), tunable attenuator, the first wave division multiplex coupler, locally swashs at the first optical filter
Light device, the second wave division multiplex coupler, the second semiconductor optical amplifier (SOA2), optical circulator, the second optical filter.
Wherein, the wavelength outside full optical phase modulator is λ1Input optical signal, the input with photo-coupler
End is connected, and an output end of photo-coupler is connected with the input terminal of tunable delayer；Another of photo-coupler is defeated
Outlet is connected with an input terminal of the first wave division multiplex coupler；The output end of tunable delayer and the second wavelength-division multiplex coupling
One input terminal of clutch is connected；Another input terminal of second wave division multiplex coupler is used to receive from local detection light
Light source (wavelength λ2) continuous light；The output end of second wave division multiplex coupler is connected to the defeated of the second semiconductor optical amplifier
Enter end；
The connected local laser of another input terminal of first wave division multiplex coupler, receives defeated from local laser
Continuous light out；The output end of first wave division multiplex coupler is connected to the input terminal of the first semiconductor optical amplifier；The first half
The output end of conductor image intensifer is connected to the input terminal of the first optical filter；The output end of first optical filter is connected to adjustable
The input terminal of attenuator；The output end of adjustable attenuator is connected to the first port of optical circulator, the second port of optical circulator
It is connected to the output end of the second semiconductor optical amplifier, so that optical signal reversely inputs；In the second semiconductor optical amplifier, come
From in the control light (λ of the second wave division multiplex coupler1) and detection light (λ2) and from optical circulator control light (λ1) three
Interaction completes the phase-modulation for detecting light；Modulated detection light (λ2) from the second semiconductor optical amplifier
Output end output, and it is connected to the second port of optical circulator；Modulated detection light (λ2) by optical circulator and from third
Port exports and is connected to the input terminal of the second optical filter；Finally, modulated detection light (λ2) pass through the second optical filter
It is exported after filtering.
The full optical phase modulator of fast tunable of the invention, the tunable delayer is by a pair of of self-focusing lens institute
Composition, by movement, their space length has the function that delay time is adjusted.
The full optical phase modulator of fast tunable of the invention, the adjustable damping are made of a pair of of self-focusing lens,
By changing the insertion loss between them to the effect for adjusting decaying.
The full optical phase modulator of fast tunable of the invention, first semiconductor optical amplifier and the second semiconductor light
Amplifier is common through mode semiconductor optical amplifier.
Fig. 8 is a kind of structural schematic diagram of the full optical phase modulator of fast tunable described in the embodiment of the present invention 2, with figure
7 difference is phase inverter, which includes the first optical circulator, F-P laser and the first optical filter, F-P laser
The wavelength of device is λ1′；Wherein,
Second road optical signal of photo-coupler output reaches F-P laser through the first optical circulator；When being input to F-P laser
Usually for bloom, F-P laser is suppressed second road optical signal of device, is not shone；When the second road light for being input to F-P laser
Usually for low light, F-P laser starting of oscillation shines signal, so that the phase of the optical signal of F-P laser output swashs with F-P is input to
The opposite in phase of second road optical signal of light device, the optical signal of F-P laser output are the second road optical signal after radix-minus-one complement, radix-minus-one complement
The second road optical signal afterwards exports after the filtering of the first optical filter to optical power adjustment module.
As shown in figure 9, difference from Example 1 is: in order to increase the intersection in the second semiconductor optical amplifier
The effect of phase-modulation amplifies the two-way differential balance signal exported from tunable delayer and adjustable attenuator,
A third image intensifer is increased between the output end of tunable delayer and the input terminal of wave division multiplex coupler；Together
When the 4th image intensifer is increased between adjustable attenuator and the input terminal of optical circulator；
The full optical phase modulator of fast tunable of the invention, third image intensifer and the 4th image intensifer are commonly to mix
Doped fiber amplifier.Particularly, in order to save the use of amplifier, third image intensifer and the 4th image intensifer is double with one
It replaces to amplifier (referring to Fig. 9).
The full optical phase modulator of fast tunable of the invention will be connected to reduce volume and improve stability with optical fiber
The component connect is integrated into a waveguide device.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvements and modifications, these improvements and modifications can also be made
Also it should be regarded as protection scope of the present invention.
Claims (8)
1. a kind of full optical phase modulator, which is characterized in that including differential balance signal forming unit and light phase modulation unit,
Light phase modulation unit includes semiconductor optical amplifier；Wherein,
Differential balance signal forming unit, for being λ by wavelength1The optical signal of intensity modulated become two-way differential balance signal,
This two-way differential balance signal respectively with detection light in the same direction, inverse injection semiconductor optical amplifier；This two-way differential balance signal
Respectively wavelength is λ1First via optical signal and wavelength be λ '1Radix-minus-one complement after the second road optical signal, first via optical signal and anti-
The second road optical signal radix-minus-one complement each other after code；Wherein, | λ1-λ′1| < f, f are preset maximum wavelength phase difference, P1(t,λ1)+P2
(t,λ′1)≡P0, P1(t,λ1) be first via optical signal in time t power, P2(t,λ′1) in time t after radix-minus-one complement
The power of second road optical signal, P0For constant；
Semiconductor optical amplifier is generated for being interacted according to two-way differential balance signal and the detection light for needing to be modulated
Cross-phase Modulation.
2. a kind of full optical phase modulator according to claim 1, which is characterized in that differential balance signal forming unit packet
Include photo-coupler, phase inverter, tunable delayer and optical power adjustment module；Wherein,
Photo-coupler, for the optical signal of externally input intensity modulated to be divided into two-way: first via optical signal and the second road light
Signal；
Tunable delayer, for postponing first via optical signal；
Phase inverter, for the second road optical signal to become to the signal with the optical signal radix-minus-one complement of intensity modulated, after exporting radix-minus-one complement the
Two road optical signals are to optical power adjustment module；
Optical power adjustment module, for decaying or amplifying the power of the second road optical signal after radix-minus-one complement, so that the after delay
The sum of power of the second road optical signal after optical signal and radix-minus-one complement is constant all the way.
3. a kind of full optical phase modulator according to claim 2, which is characterized in that the photo-coupler is 1X2 optocoupler
Clutch, optical power adjustment module are tunable attenuator or adjustable amplifier.
4. a kind of full optical phase modulator according to claim 2, which is characterized in that phase inverter includes the first wavelength-division multiplex
Coupler, local laser, the first semiconductor optical amplifier and the first optical filter, the wavelength of local laser are λ '1；Its
In,
Local laser, for generating continuous light and outputting this to the first wave division multiplex coupler；
First wave division multiplex coupler, the second road optical signal for exporting continuous light with photo-coupler synthesizes to be believed all the way
Number, the second road optical signal to the first semiconductor optical amplifier after output combining；
First semiconductor optical amplifier, for generating cross-gain modulation to the second road optical signal after combining, so that output letter
Number phase and intensity modulated optical signal opposite in phase, export radix-minus-one complement after the second road optical signal filtered through the first optical filter
It exports after wave to optical power adjustment module.
5. a kind of full optical phase modulator according to claim 2, which is characterized in that phase inverter includes the first ring of light row
Device, F-P laser and the first optical filter, the wavelength of F-P laser are λ '1；Wherein,
Second road optical signal of photo-coupler output reaches F-P laser through the first optical circulator；When being input to F-P laser
Usually for bloom, F-P laser is suppressed second road optical signal, is not shone；When the second road optical signal for being input to F-P laser
Usually for low light, F-P laser starting of oscillation shine so that F-P laser output optical signal phase and be input to F-P laser
The second road optical signal opposite in phase, the optical signal of F-P laser output is the second road optical signal after radix-minus-one complement, after radix-minus-one complement
Second road optical signal exports after the filtering of the first optical filter to optical power adjustment module.
6. a kind of full optical phase modulator according to claim 1, which is characterized in that light phase modulation unit further includes
Two wave division multiplex couplers and third wave division multiplex coupler, wherein
Second wave division multiplex coupler, for by first via optical signal and needing the detection modulated photosynthetic for light output all the way extremely
Semiconductor optical amplifier；
Third wave division multiplex coupler, for exporting the second road optical signal after radix-minus-one complement to semiconductor optical amplifier；
Semiconductor optical amplifier is generated for being interacted according to two-way differential balance signal and the detection light for needing to be modulated
Cross-phase Modulation, the optical signal after completing phase-modulation is filtered through third wave division multiplex coupler to be exported.
7. a kind of full optical phase modulator according to claim 1, which is characterized in that light phase modulation unit further includes
Two wave division multiplex couplers, the second optical circulator and the second optical filter；Wherein,
Second wave division multiplex coupler, for by first via optical signal and needing the detection modulated photosynthetic for light output all the way extremely
Semiconductor optical amplifier；
Second optical circulator, for exporting second its first port of road optical signals input after radix-minus-one complement, second port to half
Conductor image intensifer；
Semiconductor optical amplifier is generated for being interacted according to two-way differential balance signal and the detection light for needing to be modulated
Cross-phase Modulation, second port input, the third port output of the second optical circulator of optical signals after completing phase-modulation
It is exported to the second optical filter.
8. a kind of full optical phase modulator according to claim 1, which is characterized in that the f is 50GHz.
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