CN107070559A - A kind of full optical phase modulator - Google Patents
A kind of full optical phase modulator Download PDFInfo
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- CN107070559A CN107070559A CN201710205287.5A CN201710205287A CN107070559A CN 107070559 A CN107070559 A CN 107070559A CN 201710205287 A CN201710205287 A CN 201710205287A CN 107070559 A CN107070559 A CN 107070559A
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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
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Abstract
The invention discloses a kind of full optical phase modulator, including differential balance signal forming unit and light phase modulation unit, light phase modulation unit includes 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, for according to two-way differential balance signal and the detection light interaction for needing to be modulated, producing Cross-phase Modulation.Quick tuning can be achieved in the present invention, simple in construction and easy to use.
Description
Technical field
The present invention relates to phase-modulator technical field, particularly a kind of full optical phase modulator.
Background technology
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
Improve constantly, phase-shift keying (PSK) (PSK) signal turns into the mainstream technology of 40Gb/s, more than 100Gb/s high speed optical communication.Applying phase
In the system for moving 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.
Lithium niobate (LiNbO based on Mach-Zeng Deer principle of interferences3) electrooptic modulator, its 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 waveguides are divided into two-way, phase shift difference are produced by Electro-optical Modulation when by two-way interfere arm up and down, in another Y type waveguide
Interference superposition is carried out, its output amplitude is relevant with the phase difference of two arms.Therefore, Output optical power is relevant with modulation voltage.For
The suitable operating point of selection, in addition to modulation voltage, will also add a DC offset voltage, to ensure to realize modulator
Difference in functionality.
, it is necessary to which direct current biasing operating point is placed on zero point when phase-modulation is realized, control voltage is believed for bipolarity
Number, it can be obtained by the signal of [0, π] phase place change in the output end of modulator.At present, single pass 40Gb/s Electro-optical Modulations
Device is ripe (the problem of domestic electrooptic modulator still has unstable), but further improves the single-pass of electrooptic modulator
Road speed difficulty is very big (here, not including being improved using speed caused by binary channels).Because with the increase of modulation rate,
It is required that the electric signal and optical signal in modulator are with traveling wave mode synchronous transfer, and interelectrode capacity is very small, difficult in technique
To accomplish.Especially when ultra-narrow light pulse is fs magnitudes, to realize that fs grades of light modulation is almost not using electrooptic modulator
It is possible, do not simply fail to produce 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 following modulation technique so as to break through the rate limit of electrooptic modulator onto light.
The content of the invention
The technical problems to be solved by the invention are to overcome the deficiencies in the prior art and provide a kind of full optical phase modulator,
Quick tuning can be achieved in the present invention, simple in construction and easy to use.
The present invention uses following technical scheme to solve above-mentioned technical problem：
Adjusted according to a kind of full optical phase modulator proposed by the present invention, including differential balance signal forming unit and light phase
Unit processed, 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 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 default maximum wavelength phase difference, P1(t,
λ1)+P2(t,λ1′)≡P0, P1(t,λ1) for the power of first via optical signal in time t, P2(t,λ1') radix-minus-one complement in time t
The power of the second road optical signal afterwards, P0For constant；
Semiconductor optical amplifier, the detection light for being modulated according to two-way differential balance signal and needs interacts,
Produce Cross-phase Modulation.
It is used as a kind of complete further prioritization scheme of optical phase modulator of the present invention, differential balance signal forming unit
Including photo-coupler, phase inverter, tunable delayer and optical power adjustment module；Wherein,
Photo-coupler, for the optical signal of the intensity modulated of outside input to be divided into two-way：First via optical signal and second
Road optical signal；
Tunable delayer, for first via optical signal to be postponed；
Phase inverter, for becoming the second road optical signal after the signal with the optical signal radix-minus-one complement of intensity modulated, output radix-minus-one complement
The second road optical signal to optical power adjustment module；
Optical power adjustment module, the power for decaying or amplifying 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 second road optical signal power sum it is constant.
As a kind of complete further prioritization scheme of optical phase modulator of the present invention, the photo-coupler is 1X2 light
Coupler, optical power adjustment module is tunable attenuator or amplifier.
As a kind of complete further prioritization scheme of 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 producing continuous light and outputting this to the first wave division multiplex coupler；
First wave division multiplex coupler, the second road optical signal for continuous light and photo-coupler to be exported is synthesized all the way
Signal, the second road optical signal to the first semiconductor optical amplifier after output combining；
First semiconductor optical amplifier, for producing XGM to the second road optical signal after combining so that defeated
The the second road optical signal gone out after the opposite in phase of the phase of signal and the optical signal of intensity modulated, output radix-minus-one complement is filtered through the first light
Exported after device filtering to optical power adjustment module.
As a kind of complete further prioritization scheme of 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 is λ1′；Wherein,
Second road optical signal of photo-coupler output reaches F-P laser through the first optical circulator；When input to F-P laser
For bloom usually, F-P laser is suppressed second road optical signal of device, is not lighted；When the second road light of input to F-P laser
For low light usually, F-P laser starting of oscillation lights signal so that the phase of the optical signal of F-P laser output is sharp to F-P with input
The opposite in phase of second road optical signal of light device, the optical signal of F-P laser output is the second road optical signal after radix-minus-one complement, radix-minus-one complement
The second road optical signal afterwards is exported to optical power adjustment module after being filtered through the first optical filter.
As a kind of complete further prioritization scheme of optical phase modulator of the present invention, light phase modulation unit also includes
Second wave division multiplex coupler and the 3rd 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
Go out to semiconductor optical amplifier；
3rd wave division multiplex coupler, for the second road optical signal after radix-minus-one complement to be exported to semiconductor optical amplifier；
Semiconductor optical amplifier, the detection light for being modulated according to two-way differential balance signal and needs interacts,
Cross-phase Modulation is produced, the optical signal after phase-modulation is completed and filters output through the 3rd wave division multiplex coupler.
As a kind of complete further prioritization scheme of optical phase modulator of the present invention, light phase modulation unit also 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
Go out to semiconductor optical amplifier；
Second optical circulator, for second its first port of road optical signals input after radix-minus-one complement, second port to be exported
To semiconductor optical amplifier；
Semiconductor optical amplifier, the detection light for being modulated according to two-way differential balance signal and needs interacts,
Cross-phase Modulation is produced, second port input, the 3rd port of the optical circulator of optical signals second after phase-modulation is completed
Output to the second optical filter is exported.
As a kind of complete further prioritization scheme of optical phase modulator of the present invention, the f is 50GHz.
The present invention uses above technical scheme compared with prior art, with following technique effect：
(1) present invention breaks through the rate limit of current Electro-optical Modulation, it is possible to achieve the modulation of fs magnitude optical signals；
(2) stationary problem of the present invention in design without consideration control light and detection light；
(3) light source (laser) that the present invention is easy to being modulated becomes one；
(4) present invention can be used for the occasion that phase-modulation is carried out to optical signal.
Brief description of the drawings
Fig. 1 is the modulator structure schematic diagram based on MZ interferometer structures in the prior art；
Fig. 2 is the overall structure diagram of the present invention；
Fig. 3 is the structural representation of the differential balance signal generation unit of the present invention；
Fig. 4 is the structural representation of the phase modulation unit of the present invention；
Fig. 5 is the inverter structure schematic diagram based on SOA Cross-phase Modulations used in the present invention；
Fig. 6 is the inverter structure schematic diagram of the state of being opened the light based on laser used in the present invention；
Fig. 7 is a kind of structural representation 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 representation 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 representation of the full optical phase modulator of fast tunable described in the embodiment of the present invention 3.
Embodiment
Technical scheme is described in further detail below in conjunction with the accompanying drawings：
The invention solves the problems that the approach that problem is previously mentioned in background technology is exactly to change Electro-optical Modulation for full light modulation.It is so-called complete
Optical phase modulator, refers to the detection light for injecting the device in the presence of the intensity type control optical signal of external carrying information,
Its phase for exporting detection light changes with the Strength Changes of external control light, so that the information for controlling light is reprinted in detection
In the phase of light.It should be noted that control light only should be modulated to the phase for detecting light, and for detecting the intensity of light
Should be unaffected.
Full optical phase modulator has many good qualities compared with electrooptic modulator.First, inside full optical modulator, adjusted
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 magnitudes)
Dispersion is negligible, and its transmission speed is essentially identical, so being natural synchronous.Secondly, adjusted based on nonlinear full light
Device processed, response speed easily reaches fs magnitudes, also in the absence of distributed capacitor inductance the problems such as.3rd, full light phase modulation
The active devices such as the light source (laser) used in device, have identical technique with modulator device, can easily be integrated into
One miniature device, small volume.These essential advantages determine that only full optical modulator can meet the tune of super 100G systems
Demand processed.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, such as Fig. 2 is the overall structure diagram of the present invention, bag
Include two parts：1. differential balance signal forming unit；2. adjusted with semiconductor optical amplifier (SOA) for the light phase 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, is changed into 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 power sum of the two is constant, i.e. P1(t,λ1)+P2
(t,λ1′)≡P0(constant), and the two radix-minus-one complement (the data contrast of carrying), even P each other1(t,λ1) be " 1 " code when, P2
(t,λ1') it is " 0 " code, vice versa.Because the extinction ratio of actual NRZ codes 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 produce radix-minus-one complement each other, it is necessary to using phase inverter, tend not to make P1And P2Ripple
Length is completely the same, may there is some errors, that is, in P1(t,λ1) and P2(λ1') in only need to λ1≈λ1', in the following description
In, we are no longer strictly distinguish between 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 produce Cross-phase Modulation.
In theory, the gain in SOA transient processes meets following three equation with phase place change
In formula, P (z, τ) is the luminous power at certain point z moment t inside SOA, and g (z, τ) is the certain point moment inside SOA
Gain,For the phase of SOA inside certain point moment complex amplitude, α is linewidth enhancement factor, be can be considered within the specific limits
Constant, EsatFor SOA saturation power, constant can be considered.Defining integration gainPhase shift can be obtained by solving equationWhen the control light of inverse injection equal-wattage, g (τ) is equal, but
ThenIf static operating point is placed in pi/2, and makeIt can be obtained by [0, π] two
State.The high-speed phase modulation of area of light is so achieved that, just as going to modulate lithium niobate electrooptic modulator one with high-speed electrical signals
Sample.
The differential wave formation part of full optical phase modulator of the present invention, 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 turns into differential balance signal all the way by a delayer all the way；Another road is first
First pass through a phase inverter, carry out operated in anti-phase, output signal and input signal radix-minus-one complement each other, it is followed by a tunable decay
Device, its output signal as differential balance signal another road.
Light phase modulation unit of the present invention, including a semiconductor optical amplifier (SOA), a wavelength-division multiplex coupling
Clutch, a circulator, and a wave 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, another road of differential balance controls light P2(t,λ1') first reach circulator 1 port, and from
The 2 ports output of circulator enters SOA, from the detection light of the SOA process phase-modulations exported, by 3 ports of circulator
Output, is then output as the light of phase-modulation via a wave filter Filter.
Described phase inverter, can there is various structures, and conventional is to utilize semiconductor optical amplifier cross-gain modulation,
As shown in Figure 5.It includes a wave division multiplex coupler, a local laser LD (λ1'), its wavelength is sufficiently close to input light
Wavelength, a semiconductor optical amplifier, an and wave 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.So, the λ of output1' light is exactly defeated
Enter the radix-minus-one complement of light.
Another phase inverter is made up of the local laser for being operated on off state, and referring to Fig. 6, it includes one and gone in ring
Device, a laser and a wave filter.When input light is injected into local laser by a circulator, when it is low
Light without ambient light usually (when namely injecting), and local laser starting of oscillation exports the flat λ of a bloom1' light；Work as input light
For bloom usually, local laser is under the locking of exterior light, not starting of oscillation, is output as the light close to 0.After filtered, obtain
Optical signal with input light radix-minus-one complement.Fig. 6 structure is more succinct than Fig. 5, but response speed is slightly slow.
Following examples are used to illustrate the present invention, but are not limited to 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), the first optical filter, tunable attenuator, the first wave division multiplex coupler, local swash
Light device, the second wave division multiplex coupler, the second semiconductor optical amplifier (SOA2), optical circulator, the second optical filter.
Wherein, it is λ to come from the wavelength outside full optical phase modulator1Input optical signal, the input with photo-coupler
End is connected, and an output end of photo-coupler is connected with the input of tunable delayer；Another of photo-coupler is defeated
Go out end with an input of the first wave division multiplex coupler to be connected；The output end of tunable delayer and the second wavelength-division multiplex coupling
One input of clutch is connected；Another input of second wave division multiplex coupler is used for receiving from local detection light
(wavelength is λ to light source2) continuous light；The output end of second wave division multiplex coupler is connected to the defeated of the second semiconductor optical amplifier
Enter end；
Another input of first wave division multiplex coupler is connected local laser, and it is defeated that reception comes from local laser
The continuous light gone out；The output end of first wave division multiplex coupler is connected to the input of the first semiconductor optical amplifier；The first half
The output end of conductor image intensifer is connected to the input of the first optical filter；The output end of first optical filter is connected to adjustable
The input of attenuator；The output end of adjustable attenuator is connected to the first port of optical circulator, the second port of optical circulator
The output end of the second semiconductor optical amplifier is connected to, so that optical signal is reversely inputted；In the second semiconductor optical amplifier, come
From in the control light (λ of the second wave division multiplex coupler1) with detecting light (λ2) and come from the control light (λ of optical circulator1) three
Interaction, completes the phase-modulation for detecting light；Detection light (λ after modulation2) from the second semiconductor optical amplifier
Output end is exported, and is connected to the second port of optical circulator；Detection light (λ after modulation2) by optical circulator and from the 3rd
Port exports and is connected to the input of the second optical filter；Finally, the detection light (λ after modulation2) pass through the second optical filter
Exported after filtering.
The full optical phase modulator of fast tunable of the present invention, the tunable delayer is by a pair of GRIN Lens institute
Composition, the effect of time delay regulation is reached by they mobile space length.
The full optical phase modulator of fast tunable of the present invention, the adjustable damping is made up of a pair of GRIN Lens,
By changing the insertion loss between them to the effect of regulation decay.
The full optical phase modulator of fast tunable of the present 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 representation 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, and the phase inverter 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 input to F-P laser
For bloom usually, F-P laser is suppressed second road optical signal of device, is not lighted；When the second road light of input to F-P laser
For low light usually, F-P laser starting of oscillation lights signal so that the phase of the optical signal of F-P laser output is sharp to F-P with input
The opposite in phase of second road optical signal of light device, the optical signal of F-P laser output is the second road optical signal after radix-minus-one complement, radix-minus-one complement
The second road optical signal afterwards is exported to optical power adjustment module after being filtered through the first optical filter.
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, for being amplified from the two-way differential balance signal of tunable delayer and adjustable attenuator output,
The 3rd image intensifer is added between the output end of tunable delayer and the input of wave division multiplex coupler；Together
When the 4th image intensifer is added between adjustable attenuator and the input of optical circulator；
The full optical phase modulator of fast tunable of the present invention, the 3rd image intensifer and the 4th image intensifer are commonly to mix
Doped fiber amplifier.Especially, it is in order to save the use of amplifier, the 3rd image intensifer and the 4th image intensifer is double with one
Replaced (referring to Fig. 9) to amplifier.
The full optical phase modulator of fast tunable of the present invention, in order to reduce volume with improving stability, will be connected with optical fiber
The component connect, is integrated into a waveguide device.
Described above is only the 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, some improvement and modification can also be made, these improvement and modification
Also it should be regarded as protection scope of the present invention.
Claims (8)
1. a kind of full optical phase modulator, it is characterised 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 λ1' radix-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-λ1' | ＜ f, f are default maximum wavelength phase difference, P1(t,λ1)+P2
(t,λ1′)≡P0, P1(t,λ1) for the power of first via optical signal in time t, P2(t,λ1') in time t after radix-minus-one complement
The power of second road optical signal, P0For constant；
Semiconductor optical amplifier, for according to two-way differential balance signal and the detection light interaction for needing to be modulated, producing
Cross-phase Modulation.
2. a kind of full optical phase modulator according to claim 1, it is characterised in that differential balance signal forming unit bag
Include photo-coupler, phase inverter, tunable delayer and optical power adjustment module；Wherein,
Photo-coupler, for the optical signal of the intensity modulated of outside input to be divided into two-way：First via optical signal and the second road light
Signal；
Tunable delayer, for first via optical signal to be postponed；
Phase inverter, for the second road optical signal to become to the signal with the optical signal radix-minus-one complement of intensity modulated, the after output radix-minus-one complement
Two road optical signals are to optical power adjustment module；
Optical power adjustment module, the power for decaying or amplifying the second road optical signal after radix-minus-one complement so that after delay
The power sum 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, it is characterised in that the photo-coupler is 1X2 optocouplers
Clutch, optical power adjustment module is tunable attenuator or amplifier.
4. a kind of full optical phase modulator according to claim 2, it is characterised 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 is λ1′；Its
In,
Local laser, for producing continuous light and outputting this to the first wave division multiplex coupler；
First wave division multiplex coupler, the second road optical signal for continuous light to be exported with photo-coupler is synthesized 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 producing XGM to the second road optical signal after combining so that output letter
Number phase and intensity modulated optical signal opposite in phase, output radix-minus-one complement after the second road optical signal filtered through the first optical filter
Exported after ripple to optical power adjustment module.
5. a kind of full optical phase modulator according to claim 2, it is characterised 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 is λ1′；Wherein,
Second road optical signal of photo-coupler output reaches F-P laser through the first optical circulator；When input to F-P laser
For bloom usually, F-P laser is suppressed second road optical signal, is not lighted；When the second road optical signal of input to F-P laser
For low light usually, F-P laser starting of oscillation lights so that the phase of the optical signal of F-P laser output and 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 is exported to optical power adjustment module after being filtered through the first optical filter.
6. a kind of full optical phase modulator according to claim 1, it is characterised in that light phase modulation unit also includes the
Two wave division multiplex couplers and the 3rd wave division multiplex coupler, wherein,
Second wave division multiplex coupler, for by first via optical signal with needing the detection modulated photosynthetic for light output all the way extremely
Semiconductor optical amplifier；
3rd wave division multiplex coupler, for the second road optical signal after radix-minus-one complement to be exported to semiconductor optical amplifier；
Semiconductor optical amplifier, for according to two-way differential balance signal and the detection light interaction for needing to be modulated, producing
Cross-phase Modulation, completes the optical signal after phase-modulation and filters output through the 3rd wave division multiplex coupler.
7. a kind of full optical phase modulator according to claim 1, it is characterised in that light phase modulation unit also includes the
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 with needing the detection modulated photosynthetic for light output all the way extremely
Semiconductor optical amplifier；
Second optical circulator, for second its first port of road optical signals input after radix-minus-one complement, second port to be exported to half
Conductor image intensifer；
Semiconductor optical amplifier, for according to two-way differential balance signal and the detection light interaction for needing to be modulated, producing
Cross-phase Modulation, completes second port input, the output of the 3rd port of the optical circulator of optical signals second after phase-modulation
To the output of the second optical filter.
8. a kind of full optical phase modulator according to claim 1, it is characterised in that the f is 50GHz.
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