CN104979747B - Integrated reflective phase bias device and optical fiber laser and light wave microwave phase discriminator - Google Patents
Integrated reflective phase bias device and optical fiber laser and light wave microwave phase discriminator Download PDFInfo
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Abstract
The invention discloses a kind of integrated reflective phase bias device and optical fiber laser and light wave microwave phase discriminator.The phase bias device of the present invention includes fibre holder, collimation lens, devating prism, Faraday rotator, birefringece crystal and speculum；The present invention uses in fibre holder and fixes two mutually perpendicular polarization maintaining optical fibres in polarization-maintaining direction, devating prism separates the mutually perpendicular light in two-way polarization direction, only need a collimater, a Faraday rotator, a birefringece crystal, one speculum, small volume, stability is high, and price is low, it is not necessary to any regulation；For optical fiber laser, the mode locking pulse row of self-starting are can obtain, and the characteristic of spike train is not disturbed by external environment, may be used on the complex environments such as various strong noises, heavily contaminated or transmitting；For light wave microwave phase discriminator, it can be made more to minimize, it is less relatively reliable by external interference, work.
Description
Technical field
The present invention relates to Fiber laser technology, more particularly to a kind of integrated reflective phase bias device and its optical-fiber laser
Device and Lightwave-Microwave phase discriminator.
Background technology
Mode locked fiber laser pulse is ultrashort, and repetition rate determines, peak power is high, in scientific research and industrial processes
There is irreplaceable application value.But the common laser of contrast, mode-locked laser are difficult to self-starting, easily by external interference,
Price is high, hampers its application.
Locked mode scheme mainly has three kinds in optical fiber laser：Non-linear loop speculum, saturable absorber, it is non-linear partially
Shake rotation.The 8 font mode locked fiber laser locked mode difficulty in starting that non-linear loop speculum is formed, outside promotion is often needed,
And non PM fiber；Semiconductor saturable absorber has the life-span in saturable absorber, is easily damaged；Other carbon-based saturables are inhaled
Acceptor, such as CNT, graphene etc., it is easy to deteriorate under natural environment, loses locked mode startup function.Nonlinear polarization
Rotation can provide reliable and stable locked mode Initiated Mechanism, there is provided very high mean power, and using almost all of
Pulse shaping mechanism, obtain high repetition frequency or low-repetition-frequency, psec or femtosecond pulse row.But it utilizes nonlinear polarization
The essence of rotation, determine that it must use non PM fiber, and non PM fiber determines that this laser is necessarily quick to environment
Sense.
Non-linear loop speculum was once earliest mode-locking device, with its manufactured double loop optical fiber laser (8 font
Optical fiber laser) mode locking pulse can be provided.But it is generally not self-starting.Reason is that its loop is zero offset.
And in the case of zero offset, susceptibility very little of the loop speculum to nonlinear phase shift.Therefore a phase bias is needed.It is so-called
Phase bias, refer to that the light of counterpropagate in same light path undergoes different phase shifts.
The paper that Jungwon Kim (Nintaus's member) et al. are delivered on Optics Letters《Subfemtosecond
synchronization of microwave oscillators with mode-locked Er-fiber lasers》In
Lightwave-Microwave phase discriminator, make use of asymmetric phase-shifter, and by the use of it as fiber optic loop in phase bias device, but by point
Vertical spaced members are formed, and are through modes, are not reflective, it is necessary to two Faraday rotators, without inclined in phase-shifter
Shake prism.
The patent application of Menlo Systems companies《Laser with non-linear optical loop
mirror》.(US201500711322) Jungwon Kim etc. phase-shifter and phase bias method is make use of, constitutes a kind of lock
Mode laser.Wherein phase bias device is also through mode, it is necessary to two Faraday rotators, does not also have devating prism in phase-shifter
What Honzatko et al. delivered in 2013 on Optics Letters《A mode-locked thulium-
doped fiber laser based on a nonlinear loop mirror》Paper, and Huang et al. was in 2015
Delivered on Optics Letters《Direct generation of 2W average-power and 232nJ
picosecond pulses from an ultra-simple Yb-doped double-clad fiber laser》Paper,
Without phase bias device, it is therefore desirable to which very high pulse power can be only achieved modelocking threshold, and (hundreds of psecs are extremely for the non-constant width of pulse
Several nanoseconds).
The content of the invention
In order to obtain self-starting and locked mode steady in a long-term in optical fiber laser, overcome because the environment such as temperature, vibration are joined
Locked mode caused by several changes deteriorates, the present invention propose a kind of integrated reflective phase bias device and its optical fiber laser and
Lightwave-Microwave phase discriminator.
It is an object of the invention to provide a kind of integrated reflective phase bias device and its optical fiber laser and light wave-micro-
Ripple phase discriminator.
The integrated reflective phase bias device of the present invention includes：Fibre holder, collimation lens, devating prism, farad
Circulator, birefringece crystal and speculum；Wherein, fibre holder fixes the first and second polarization maintaining optical fibres, this two polarization-maintainings
The fast axle of optical fiber is orthogonal, and slow axis is orthogonal, and input and output each other；After the first polarization maintaining optical fibre, polarization
Incident light of the direction along an axle of the first polarization maintaining optical fibre, after collimated collimated, entered with an angle by devating prism
It is incident upon Faraday rotator；The polarization direction of incident light is rotated 45 degree by Faraday rotator, makes polarization direction brilliant with birefringence
One axle of body is parallel；Then birefringece crystal is incident to, phase shift φ occurs1After/2, impinge perpendicularly on speculum；Through reflection
Returned after mirror reflection, again pass by birefringece crystal phase shift and double as φ1；Again pass by Faraday rotator rear polarizer direction again
45 degree of rotation, it is vertical with the polarization direction that the incident light before entering devating prism is come out from the first polarization maintaining optical fibre；By polarizing rib
Mirror, because the polarization direction of return light and incident light is orthogonal, from the angle and the angle of incident light after devating prism outgoing
Difference, so as to be entered with another angle after devating prism outgoing through collimation lens in the second polarization maintaining optical fibre, and polarize
Same axle of the direction along the second polarization maintaining optical fibre, so as to be emitted from the second polarization maintaining optical fibre；Same mode, by the second polarization-maintaining
The incident light of optical fiber, an axle of the polarization direction along the second polarization maintaining optical fibre, polarization side make it that after Faraday rotator rotates
To parallel with another axle of birefringece crystal, after being enclosed along opposite path round-trip one, generation phase shift is φ2, polarization direction
Enter the first polarization maintaining optical fibre along the same axle of the first polarization maintaining optical fibre, so as to be emitted from the first polarization maintaining optical fibre, wherein, φ1≠
φ2。
Polarization maintaining optical fibre has two axles of fast axle and slow axis, orthogonal on the polarization-maintaining director space of this two polarization maintaining optical fibres,
The fast axle of i.e. two polarization maintaining optical fibres is orthogonal, and the slow axis of two optical fiber is orthogonal, is protected respectively by first and second
The polarization direction of the fine incident light of polarisation, it is orthogonal on devating prism front space is entered, so as to ensure from a polarization-maintaining light
The polarization direction of fine incident light is along fast axle, and after round circle polarization direction is rotated by 90 °, return light enters another polarization-maintaining light
Fine polarization direction is still along the fast axle of another optical fiber, and similarly, the polarization direction of the incident light of a polarization maintaining optical fibre is along slow
Axle, return light enter slow axis of another polarization maintaining optical fibre still along another optical fiber.
By polarization direction along exemplified by slow axis：By the first polarization maintaining optical fibre incident light polarization direction along slow axis, by standard
Straight lens, devating prism to be passed through with an angle, is then incident to faraday rotation mirror, its polarization direction is rotated 45 degree, with
The slow axis (or fast axle) of birefringece crystal is parallel, obtains phase shift φ1After/2, incide on speculum；Returned after speculum reflects
Return, again pass by birefringece crystal phase shift and double as φ1；Again pass by Faraday rotator rear polarizer direction and rotate 45 degree again,
It is orthogonal with the polarization direction of incident light, because the polarization direction of return light and incident light is orthogonal, go out from devating prism
Angle after penetrating is different from the angle of incident light, hence into the second polarization maintaining optical fibre, due to the second polarization maintaining optical fibre and first
The slow axis of polarization maintaining optical fibre is orthogonal, therefore polarization direction is still along the slow axis of the second polarization maintaining optical fibre, so as to from the second polarization-maintaining
Fiber exit.Same mode, by the second polarization maintaining optical fibre incident light polarization direction along slow axis, by collimation lens, with
Another angle is incident to devating prism, is then incident to faraday rotation mirror, and its polarization direction is rotated 45 degree, with birefringence
The fast axle (or slow axis) of crystal is parallel, obtains phase shift φ2After/2, incide on speculum；Returned after speculum reflects, again
φ is doubled as by birefringece crystal phase shift2；Again pass by Faraday rotator rear polarizer direction and rotate 45 degree again, and from second
The polarization direction for the incident light that polarization maintaining optical fibre comes out is orthogonal, because the polarization direction of return light and incident light is orthogonal,
It is different from the angle of incident light from the angle after devating prism outgoing, hence into the first polarization maintaining optical fibre, due to the first guarantor
Polarisation is fine orthogonal with the slow axis of the second polarization maintaining optical fibre, therefore polarization direction is still along the slow axis of the first polarization maintaining optical fibre, from
And it is emitted from the first polarization maintaining optical fibre.
Polarization maintaining optical fibre is using big mode field area polarization maintaining optical fibre, doping gain polarization maintaining optical fibre, big mode field area double clad polarization-maintaining
One kind in optical fiber and polarization-maintaining photonic crystal fiber.Adulterated in polarization maintaining optical fibre, make it have gain characteristic.According to wavelength selection or
Polarization maintaining optical fibre is designed, it is not limited by wavelength.The termination of polarization maintaining optical fibre carries out the processing of angle or mode field area.Two polarization-maintaining light
Fine polarization-maintaining direction is spatially orthogonal.
Birefringece crystal includes two axles of fast axle and slow axis.The polarization direction of incident light is rotated one by Faraday rotator
Angle, rotate polarization direction parallel to an axle with birefringece crystal；And pass through from another incident light with polarization maintaining optical fibre
Same Faraday rotator, its polarization direction are rotated to parallel with another axle of birefringece crystal.Faraday rotator
Using the Faraday rotator formed in sheet type Faraday rotator, or magneto-optical crystal insertion permanent magnet.
The fast axle and slow axis of birefringece crystal in the phase bias device of the present invention introduce asymmetric phase shift, cause from it is different
The phase shift difference for the light that the parallel polarization of axle is propagated, i.e. phase bias.It is incident from the first polarization maintaining optical fibre, a circle is come and gone from the second polarization-maintaining
Fiber exit, generation phase shift are φ1, it is incident from the second polarization maintaining optical fibre, come and go a circle and be emitted from the first polarization maintaining optical fibre, phase shift occurs
For φ2, the phase shift difference of the twoSize determined by the property and thickness of birefringece crystal, i.e.,Its
In, neFor the refractive index of e light, noFor the refractive index of o light, l is the thickness of birefringece crystal, and λ is wavelength.Using one piece of birefringence
Crystal, or using the combination of the birefringece crystal of system or different-thickness, form specific phase difference, there is provided the phase arbitrarily set
Position biasing.
Further, present invention additionally comprises encapsulation steel pipe, fibre holder, collimation lens, devating prism, Faraday rotation
Device, birefringece crystal and speculum are sequentially arranged in encapsulation steel pipe.
Fibre holder uses the sizing quartz glass tube being adapted to polarization maintaining optical fibre.Devating prism uses Wollaston rib
Mirror.
Collimation lens collimates the light of optical fiber output, using graded index fiber or non-spherical lens.
The integrated reflective phase bias device of the present invention can be used for optical fiber laser and Lightwave-Microwave phase discriminator.
The optical fiber laser of the present invention includes：Fiber optic splitter, wavelength division multiplexer and phase bias device；Wherein, optical fiber point
Beam device includes first to fourth port；Mode-locked laser pulse is inputted to the first port of fiber optic splitter, connection first and second
Evanescent wave in the polarization maintaining optical fibre of port is coupled into the polarization maintaining optical fibre of the third and fourth port of connection, so as to from second and the 3rd
Port exports；Inputted from the mode-locked laser pulse of second port output by wavelength division multiplexer and gain fibre to phase bias device
A polarization maintaining optical fibre；Inputted from the mode-locked laser pulse of the 3rd port output to another polarization maintaining optical fibre of phase bias device；
The mode-locked laser pulse returned from phase bias device, by the 3rd port of fiber optic splitter, from the first end of fiber optic splitter
Mouth and the output of the 4th port.
Fiber optic splitter is 2 × 2 beam splitters, and by 2 × 2 beam splitters, incident light is divided into two light propagated in opposite directions,
Asymmetric phase difference is obtained in phase bias device, returns beam splitter, forms optical fiber loop；The light propagated in opposite directions is at beam splitter
Interfere, cause the Strength Changes of the other both ends output light of beam splitter.With the difference of common nonlinear optical fiber loop speculum
Be, the intensity ratio of the output light of predeterminable two output ends of beam splitter of phase bias device, and the direction of Strength Changes and tiltedly
Rate.
The optical fiber laser of the present invention can obtain the mode-locked laser pulse row of self-starting, and the characteristic of spike train is not by the external world
The interference of environment；Using all pulse shaping mechanism that can be used in nonlinear polarization rotation mode locked fiber laser, including
Orphan, self similarity, Totally positive dispersion and amplification self similarity etc..The output port of optical fiber laser can be set to the 4th of fiber optic splitter
Port, partially reflecting mirror can also be used and be located at first port, or pass through optical fiber type coupling beam divider.First port can also add
Fiber reflector, either spatial dispersion compensation device and speculum or wave filter；Spatial dispersion compensation device such as prism
To, grating to, chirped mirror equity.Fiber optic splitter can integrate with speculum and wavelength division multiplexer, form individual devices.Optical fiber swashs
Light device can introduce nonlinear effect, this nonlinear effect, produce nonlinear phase shift；This phase shift is combined with phase bias, shape
The authentication scheme of paired pulse light and continuous light.According to the positive and negative of biasing, first and the 4th port meeting of fiber optic splitter output
The reflection deviation to high power pulse, or transmission deviation are produced, this deviation can be as the Initiated Mechanism of mode locking pulse.
The Lightwave-Microwave phase discriminator of the present invention includes：Balanced type photodetector, circulator, fiber optic splitter, wavelength-division are multiple
With device and phase bias device；Wherein, fiber optic splitter includes first to fourth port；Mode-locked laser pulse is entered by circulator
The first port of fiber optic splitter, connect the evanescent wave in the polarization maintaining optical fibre of the first and second ports and be coupled into connection the 3rd and the
In the polarization maintaining optical fibre of four ports, so as to from second and the 3rd port output；Pass through from the mode-locked laser pulse of second port output
Input extremely connects a polarization maintaining optical fibre of phase bias device after wavelength division multiplexer；It is defeated from the mode-locked laser pulse of the 3rd port output
Enter to another polarization maintaining optical fibre of phase bias device；The mode-locked laser pulse returned from phase bias device, then pass through second respectively
Port and the 3rd port are inputted to fiber optic splitter, laggard by circulator from the mode-locked laser pulse of first port output respectively
Enter an input port of balanced type photodetector, visited from the mode-locked laser pulse of the 4th port output into balanced type photoelectricity
Another input port of device is surveyed, DC level is exported from the output port of balanced type photodetector.
The DC level of output port obtains the linear convergent rate near equalization point in balanced type detector, and this is linear defeated
Go out directly proportional to the difference on the frequency of electro-optical signal.This linear relationship can be used to lock optical frequency and be penetrated with what is added on modulator
Frequent rate.
Advantages of the present invention：
The present invention uses in fibre holder and fixes two mutually perpendicular polarization maintaining optical fibres in polarization-maintaining direction, and devating prism is by two
The mutually perpendicular light in road polarization direction separates, it is only necessary to a collimater, a Faraday rotator, a birefringece crystal,
One speculum, small volume, stability is high, and price is low, it is not necessary to any regulation；For optical fiber laser, self-starting can obtain
Mode locking pulse row, and the characteristic of spike train is not disturbed by external environment, may be used on various strong noises, heavily contaminated or transmitting
Deng complex environment；For Lightwave-Microwave phase discriminator, it can be made more to minimize, it is less relatively reliable by external interference, work.
Brief description of the drawings
Fig. 1 is the schematic diagram of the integrated reflective phase bias device of the present invention；
Fig. 2 is that the integrated reflective phase bias device of the present invention is used for the schematic diagram of optical fiber laser；
Fig. 3 is that the integrated reflective phase bias device of the present invention is used for the schematic diagram of Lightwave-Microwave phase discriminator.
Embodiment
Below in conjunction with the accompanying drawings, by embodiment, the present invention will be further described.
As shown in figure 1, the integrated reflective phase bias device of the present embodiment includes：Fibre holder 1, collimation lens 2,
Devating prism 3, Faraday rotator 4, birefringece crystal 5, speculum 6, encapsulation steel pipe 7 and two polarization maintaining optical fibres 8 and 8 '；Optical fiber
Clamper 1 fixes the first and second polarization maintaining optical fibres 8 and 8 ', and the fast axle of this two polarization maintaining optical fibres is orthogonal and slow axis hangs down mutually
Directly, and input and output each other；By the incident light of the first polarization maintaining optical fibre 8, polarization direction collimates along slow axis, collimated lens 2
Afterwards, Faraday rotator 4 is incident to by devating prism 3 with an angle；Faraday rotator 4 is by the polarization direction of incident light
45 degree of rotation, makes polarization direction parallel with the fast axle of birefringece crystal 5；Then birefringece crystal 5 is incident to, phase shift φ occurs1/
2, impinge perpendicularly on speculum 6；The backtracking after the reflection of speculum 6, return light again pass by the phase shift of birefringece crystal 5 and added
It is again φ1；Turn 45 degree again by the rotation of the rear polarizer direction of Faraday rotator 4, it is orthogonal with the polarization direction of incident light；By
Devating prism 3, because the polarization direction of return light and incident light is orthogonal, from the angle after the outgoing of devating prism 3 and incidence
The angle of light is different, and hence into the second polarization maintaining optical fibre 8 ', and polarization direction is appointed so along the second polarization maintaining optical fibre 8 '
Slow axis, it is emitted from the second polarization maintaining optical fibre 8 '.
By the incident light of the second polarization maintaining optical fibre 8 ', slow axis of the polarization direction along the second polarization maintaining optical fibre 8 ', with another angle
Degree is incident to Faraday rotator 4 by devating prism 3；The polarization direction of incident light is rotated 45 degree by Faraday rotator 4, is made
Polarization direction is parallel with the slow axis of birefringece crystal 5；After coming and going a circle, slow axis of the polarization direction along the first polarization maintaining optical fibre 8 enters
Enter the first polarization maintaining optical fibre, so as to be emitted from the first polarization maintaining optical fibre, generation phase shift is φ2, wherein, φ1≠φ2.The phase shift difference of the twoSize determined by the property and thickness of birefringece crystal, i.e.,
As shown in Fig. 2 optical fiber laser includes：Fiber optic splitter 12, wavelength division multiplexer 15, phase bias device 11 and member
Part 18；Wherein, the device of fiber beam splitting 12 include first to fourth port 1.~4.；Mode-locked laser pulse is inputted to fiber optic splitter
1., 1. 3. connection first port is coupled into the 3rd port of connection to first port with the evanescent wave in second port 2. polarization maintaining optical fibre
In the polarization maintaining optical fibre of the 4th port 4., so as to from second and the 3rd port output；From the mode-locked laser arteries and veins of second port output
Punching is inputted to a polarization maintaining optical fibre of phase bias device 11 by wavelength division multiplexer 15；From the mode-locked laser arteries and veins of the 3rd port output
Punching is inputted to another polarization maintaining optical fibre of phase bias device；The mode-locked laser pulse returned from phase bias device, by optical fiber point
3rd port of beam device, from the first of fiber optic splitter and the 4th port 1. and 4. export.Element 18 can be fiber reflector,
Either spatial dispersion compensation device and speculum or wave filter.
As shown in figure 3, Lightwave-Microwave phase discriminator includes：Balanced type photodetector 14, circulator 13, fiber optic splitter
12nd, wavelength division multiplexer 15 and phase bias device 11；Wherein, fiber optic splitter 12 include first to fourth port 1.~4.；Locked mode
Laser pulse 16 by circulator 13 enter fiber optic splitter first port 1., connect the first and second ports polarization maintaining optical fibre
In evanescent wave be coupled into connection the third and fourth port polarization maintaining optical fibre in, so as to from second and the 3rd port output；From
The mode-locked laser pulse of Two-port netwerk output after wavelength division multiplexer by inputting to a polarization maintaining optical fibre for connecting phase bias device；From
The mode-locked laser pulse of 3rd port output is inputted to another polarization maintaining optical fibre of phase bias device；Returned from phase bias device 11
Mode-locked laser pulse, then inputted respectively by second port and the 3rd port to fiber optic splitter 12, respectively from first port
The mode-locked laser pulse of output enters an input port of balanced type photodetector 14 after circulator 13, from the 4th end
The mode-locked laser pulse of mouth output enters another input port of balanced type photodetector 14, from balanced type photodetector
Output port 17 export DC level.
It is finally noted that the purpose for publicizing and implementing mode is that help further understands the present invention, but ability
The technical staff in domain is appreciated that：Without departing from the spirit and scope of the invention and the appended claims, it is various replacement and
Modification is all possible.Therefore, the present invention should not be limited to embodiment disclosure of that, the scope of protection of present invention with
The scope that claims define is defined.
Claims (10)
1. a kind of integrated reflective phase bias device, it is characterised in that the phase bias device includes：Fibre holder, standard
Straight lens, devating prism, Faraday rotator, birefringece crystal and speculum；Wherein, the fibre holder fixes the first He
Second polarization maintaining optical fibre, the fast axle of this two polarization maintaining optical fibres is orthogonal, and slow axis is orthogonal, and input and output each other；
After the first polarization maintaining optical fibre, incident light of the polarization direction along an axle of the first polarization maintaining optical fibre, after collimated collimated, with
One angle is incident to Faraday rotator by devating prism；The Faraday rotator rotates the polarization direction of incident light
45 degree, make polarization direction parallel with an axle of birefringece crystal；Then birefringece crystal is incident to, phase shift φ occurs1After/2,
Impinge perpendicularly on speculum；Returned after speculum reflects, again pass by birefringece crystal phase shift and double as φ1；Pass through again
Cross Faraday rotator rear polarizer direction and rotate 45 degree again, with coming out the incident light before entering devating prism from the first polarization maintaining optical fibre
Polarization direction it is vertical；By devating prism, because the polarization direction of return light and incident light is orthogonal, go out from devating prism
Angle after penetrating is different from the angle of incident light, so as to be entered with another angle after devating prism outgoing through collimation lens
In second polarization maintaining optical fibre, and same axle of the polarization direction along the second polarization maintaining optical fibre, so as to be emitted from the second polarization maintaining optical fibre；
Same mode, by the incident light of the second polarization maintaining optical fibre, an axle of the polarization direction along the second polarization maintaining optical fibre, along opposite
Path round-trip one enclose after, after Faraday rotator rotates cause polarization direction it is parallel with another axle of birefringece crystal,
Generation phase shift is φ2, same axle of the polarization direction along the first polarization maintaining optical fibre enters the first polarization maintaining optical fibre, so as to be protected from first
Inclined fiber exit, wherein, φ1≠φ2。
2. phase bias device as claimed in claim 1, it is characterised in that the Faraday rotator is by the polarization side of incident light
To 45 degree of rotation, rotate polarization direction parallel to an axle with birefringece crystal；And from another incidence with polarization maintaining optical fibre
Light passes through same Faraday rotator, and its polarization direction is rotated to parallel with another axle of birefringece crystal.
3. phase bias device as claimed in claim 2, it is characterised in that the fast axle and slow axis of the birefringece crystal introduce non-
Symmetrical phase shift, cause the phase shift difference of light propagated with not coaxial parallel polarization, i.e. phase bias, enter from the first polarization maintaining optical fibre
Penetrate, come and go a circle and be emitted from the second polarization maintaining optical fibre, generation phase shift is φ1, it is incident from the second polarization maintaining optical fibre, a circle is come and gone from first
Polarization maintaining optical fibre is emitted, and generation phase shift is φ2, the phase shift difference of the twoSize determined by the property and thickness of birefringece crystal,
I.e.Wherein, neFor the refractive index of e light, no is the refractive index of o light, and l is the thickness of birefringece crystal, λ
For wavelength.
4. phase bias device as claimed in claim 1, it is characterised in that the devating prism uses wollaston prism.
5. phase bias device as claimed in claim 1, it is characterised in that also include encapsulation steel pipe, the fibre holder, standard
Straight lens, devating prism, Faraday rotator, birefringece crystal and speculum are sequentially arranged in encapsulation steel pipe.
6. phase bias device as claimed in claim 1, it is characterised in that the polarization maintaining optical fibre uses big mode field area polarization-maintaining light
One kind in fine, doping gain polarization maintaining optical fibre, big mode field area double clad polarization maintaining optical fibre and polarization-maintaining photonic crystal fiber.
7. phase bias device as claimed in claim 1, it is characterised in that the Faraday rotator uses sheet type faraday
The Faraday rotator formed in circulator, or magneto-optical crystal insertion permanent magnet.
A kind of 8. optical fiber laser using integrated reflective phase bias device as claimed in claim 1, it is characterised in that
The optical fiber laser includes：Fiber optic splitter, wavelength division multiplexer and phase bias device；Wherein, fiber optic splitter includes first
To the 4th port；Mode-locked laser pulse inputs the polarization-maintaining light that the first and second ports are connected to the first port of fiber optic splitter
Evanescent wave in fibre be coupled into connection the third and fourth port polarization maintaining optical fibre in, so as to from second and the 3rd port output；From
The mode-locked laser pulse of second port output is inputted to a polarization-maintaining of phase bias device by wavelength division multiplexer and gain fibre
Optical fiber；Inputted from the mode-locked laser pulse of the 3rd port output to another polarization maintaining optical fibre of phase bias device；From phase bias
The mode-locked laser pulse that device returns, by the 3rd port of fiber optic splitter, first port and the 4th end from fiber optic splitter
Mouth output.
9. optical fiber laser as claimed in claim 8, it is characterised in that in first port additional optical fiber speculum, Huo Zhekong
Between dispersion compensation device and speculum, or wave filter.
10. a kind of Lightwave-Microwave phase discriminator using integrated reflective phase bias device as claimed in claim 1, it is special
Sign is that the Lightwave-Microwave phase discriminator includes：Balanced type photodetector, circulator, fiber optic splitter, wavelength division multiplexer
With phase bias device；Wherein, fiber optic splitter includes first to fourth port；Mode-locked laser pulse enters optical fiber by circulator
The first port of beam splitter, connect the evanescent wave in the polarization maintaining optical fibre of the first and second ports and be coupled into the third and fourth end of connection
Mouthful polarization maintaining optical fibre in, so as to from second and the 3rd port output；Pass through wavelength-division from the mode-locked laser pulse of second port output
Input extremely connects a polarization maintaining optical fibre of phase bias device after multiplexer；From the 3rd port output mode-locked laser pulse input to
Another polarization maintaining optical fibre of phase bias device；The mode-locked laser pulse returned from phase bias device, then pass through second port respectively
Input to fiber optic splitter, enter respectively from the mode-locked laser pulse of first port output after circulator flat with the 3rd port
One input port of weighing apparatus formula photodetector, enter balanced type photodetector from the mode-locked laser pulse of the 4th port output
Another input port, export DC level from the output port of balanced type photodetector.
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| CN105896254A (en) * | 2016-06-21 | 2016-08-24 | 上海理工大学 | Compound device and optical fibre laser using compound device |
| CN105958307A (en) * | 2016-06-21 | 2016-09-21 | 上海理工大学 | Mode-locking device and optical fiber laser applying same |
| CN106207733B (en) * | 2016-09-08 | 2019-01-15 | 北京大学 | Nonlinear phase bias loop mode-locking device and its laser |
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