CN114006659A - High-order vector soliton generation system and method based on passive resonant cavity - Google Patents
High-order vector soliton generation system and method based on passive resonant cavity Download PDFInfo
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Abstract
The invention relates to the field of optical pulse output, and provides a high-order vector soliton generation system and method based on a passive resonant cavity, which comprises the following steps: the device comprises a continuous wave pump source, a first polarization controller, a first polarization beam splitter, a first modulator, a first mode generator, a second modulator, a second mode generator, a polarization beam combiner, a coupler, a second polarization controller, a third polarization controller and a second polarization beam splitter. The invention provides a new idea for generating high-order vector solitons by generating the high-order vector solitons based on the passive resonant cavity.
Description
Technical Field
The invention relates to the field of optical pulse output, in particular to a high-order vector soliton generation system and method based on a passive resonant cavity.
Background
A vector soliton is a soliton having a plurality of soliton components, each soliton component being coupled together and propagating in a medium at the same group velocity. Single mode fibers typically have weak birefringence, resulting in two orthogonal polarization directions in the fiber, making vector solitons possible in single mode fibers. According to the difference of the birefringence of the optical fiber, various vector solitons can be generated in the optical fiber. Vector solitons can be obtained in the fiber laser, and high-order vector solitons can be obtained through projection of the vector solitons generated by the fiber laser.
Vector solitons can also be generated in the Kerr resonator/passive resonant cavity, and the generation of time cavity solitons/vector solitons in the Kerr resonator/passive resonant cavity not only depends on the interaction between Kerr nonlinearity and dispersion, but also depends on the balance between nonlinear parametric gain and cavity loss.
So far, related research on generation of high-order vector solitons based on fiber lasers has been reported, and high-order vector solitons based on passive resonant cavities have not been reported.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to solve the technical problem that high-order vector solitons cannot be generated based on a passive resonant cavity in the prior art.
In order to achieve the above object, the present invention provides a high-order vector soliton generation system based on a passive resonant cavity, comprising: the device comprises a continuous wave pump source, a first polarization controller, a first polarization beam splitter, a first modulator, a first mode generator, a second modulator, a second mode generator, a polarization beam combiner, a coupler, a second polarization controller, a third polarization controller and a second polarization beam splitter;
the continuous wave pump source is connected with an inlet of the first polarization controller, an outlet of the first polarization controller is connected with an inlet of the first polarization beam splitter, a 3a outlet of the first polarization beam splitter is connected with a first inlet of the first modulator, a 3b outlet of the first polarization beam splitter is connected with a first inlet of the second modulator, the first pattern generator is connected with a second inlet of the first modulator, the second pattern generator is connected with a second inlet of the second modulator, an outlet of the first modulator is connected with an 8a inlet of the polarization beam combiner, an outlet of the second modulator is connected with an 8b inlet of the polarization beam combiner, an outlet of the polarization beam combiner is connected with a 9b inlet of the coupler, and a 9a inlet of the coupler is connected with an outlet of the second polarization controller, and the 9c outlet of the coupler is connected with the inlet of the second polarization controller, the 9d outlet of the coupler is connected with the inlet of the third polarization controller, and the outlet of the third polarization controller is connected with the inlet of the second polarization beam splitter.
Preferably, the continuous wave pumping source adopts a monochromatic continuous wave laser in simulation, the power of the monochromatic continuous wave laser is 2W, and the wavelength is 1550 nm.
Preferably, the splitting ratio of the first polarization beam splitter in simulation is 50: 50.
preferably, the first pattern generator and the second pattern generator both adopt electric pulse generators during simulation, the working power range of the electric pulse generators is 20-100W, and the electric pulse generators are used for generating gaussian pulses with preset pulse width, intensity and time delay;
during simulation, according to requirements, Gaussian pulses sequentially generated by the first pattern generator and the second pattern generator are as follows:
two unimodal Gaussian pulses with a pulse width of 20ps, an intensity of 72W and a time interval of 60 ps;
one monomodal gaussian pulse and one bimodal gaussian pulse with a pulse width of 20ps, an intensity of 72W and a time interval of 360ps, wherein the time interval between bimodal gaussian pulses is set to 200 ps;
two bimodal gaussian pulses with a pulse width of 20ps, an intensity of 72W and a time interval of 440ps, wherein the time interval between the bimodal gaussian pulses is set to 200 ps. .
Preferably, both the first modulator and the second modulator adopt intensity modulation during simulation to obtain a continuous wave pumping field added with intensity perturbation;
the continuous wave pumping field with the added intensity perturbation comprises: a polarization state u and a polarization state v, the u axis and the v axis being two orthogonal polarization axes;
the polarization state u is represented as:
Ein,u(z,τ)＝Eincos(χ)+Ep,uexp[-τ2/(2τu 2)]f(z)
the polarization state v is represented as:
Ein,v(z,τ)＝Einsin(χ)+Ep,vexp[-(τ-Δτdrift)2/(2τv 2)]f(z)
wherein E isinA continuous wave pump field output by the continuous wave pump source; ein,u(z,τ)And Ein,v(z,τ)The drive field strengths generated by the first and second pattern generators corresponding to the polarization states u and v, respectively; ep,uAnd Ep,vPeak intensities of the drive field for intensity modulation generated by the first and second pattern generators corresponding to the polarization states u and v, respectively; tau isuAnd τvPulse widths of the gaussian pulses generated by the first pattern generator and the second pattern generator, respectively; delta taudriftIs the drift time of the polarization state v relative to u; f (z) is a rectangular function, f (z) ═ Π (z/L-n)0-1/2) for z ∈ [ n ]0L,(n0+1)L]Z and L are the transmission distance and the cavity length, respectively, and when f (z) is 0, it is expressed in the nth0The rings are injected with an intensity modulation.
Preferably, the coupler has a coupling degree of 90: 10.
preferably, the coupler and the second polarization controller form a passive ring resonator through a polarization maintaining fiber, and the continuous wave pumping field added with the intensity perturbation obtains a vector cavity soliton through the passive ring resonator;
the evolution formula of the continuous wave pumping field added with the intensity perturbation in the passive annular resonant cavity is as follows:
wherein z is the transmission distance within the cavity; u and v are the slowly varying electric field envelopes of the two polarization states; alpha is alpha1(α -ln (1-k))/(2L), α is the intra-cavity loss, k is the power coupling coefficient, and L is the cavity length; Δ β is the wavevector mismatch between the two polarization modes; delta1＝δ0/L，δ0Is a loop phase mismatch; beta is a2Group velocity dispersion; delta beta1Is a group velocity mismatch; gamma is a Kerr nonlinear coefficient; eta ═ k1/2/L；EinIs a continuous wave pumping field; χ is the linear polarization direction of the pumping field.
A high-order vector soliton generation method based on a passive resonant cavity is realized based on the high-order vector soliton generation system based on the passive resonant cavity, and comprises the following steps:
s1: starting simulation, wherein the continuous wave pumping source generates input laser;
s2: the input laser sequentially passes through the first polarization controller, the first polarization beam splitter, the first modulator and the second modulator, and is subjected to intensity modulation under the action of the first mode generator and the second mode generator respectively to obtain a continuous wave pumping field added with intensity perturbation; the coupler and the second polarization controller form the passive ring resonator;
s3: enabling the continuous wave pumping field added with the intensity perturbation to sequentially pass through the polarization beam combiner and the coupler, and entering the passive ring-shaped resonant cavity for excitation to obtain vector cavity solitons;
s4: the vector cavity solitons sequentially pass through the third polarization controller and the second polarization beam splitter, and two polarization orthogonal components of the vector cavity solitons are projected on a transverse axis and a longitudinal axis of the second polarization beam splitter respectively to obtain a transverse axis projection result and a longitudinal axis projection result;
the projection process is as follows:
H＝u·cosθ+v·sinθ
V＝u·sinθ-v·cosθ
h represents a horizontal axis projection result, V represents a vertical axis projection result, and theta represents an included angle between a polarization state u and a horizontal axis in the second polarization beam splitter;
s5: obtaining a high-order vector soliton according to the two polarization orthogonal components of the vector cavity soliton, the horizontal axis projection result and the longitudinal axis projection result, which specifically comprises the following steps:
for the two vector cavity solitons with polarization orthogonal components of 1+1, if the horizontal axis projection result and the vertical axis projection result are both two pulses, the vector soliton obtained after projection is a 2+2 type high-order vector soliton; the corresponding gaussian pulses output by the first pattern generator and the second pattern generator are respectively as follows: two unimodal Gaussian pulses with a pulse width of 20ps, an intensity of 72W and a time interval of 60 ps;
for the two vector cavity solitons with polarization orthogonal components of 1+2, if the horizontal axis projection result and the vertical axis projection result are three pulses, the vector soliton obtained after projection is a 3+3 type high-order vector soliton; the corresponding gaussian pulses output by the first pattern generator and the second pattern generator are respectively as follows: one monomodal gaussian pulse and one bimodal gaussian pulse with a pulse width of 20ps, an intensity of 72W and a time interval of 360ps, wherein the time interval between bimodal gaussian pulses is set to 200 ps;
for the two vector cavity solitons with polarization orthogonal components of 2+2, if the horizontal axis projection result and the vertical axis projection result are both four pulses, the vector soliton obtained after projection is a 4+4 type high-order vector soliton; the corresponding gaussian pulses output by the first pattern generator and the second pattern generator are respectively as follows: two bimodal gaussian pulses with a pulse width of 20ps, an intensity of 72W and a time interval of 440ps, wherein the time interval between the bimodal gaussian pulses is set to 200 ps.
The invention has the following beneficial effects:
by generating high-order vector solitons based on the passive resonant cavity, a new idea of generating the high-order vector solitons is provided.
Drawings
FIG. 1 is a system block diagram of an embodiment of the present invention;
FIG. 2 is a flow chart of a method according to an embodiment of the present invention;
FIG. 3 is a time domain diagram of a "2 + 2" type high order vector soliton;
FIG. 4 is a spectrum diagram of a "2 + 2" type high-order vector soliton;
FIG. 5 is a time domain diagram of a "3 + 3" type high order vector soliton;
FIG. 6 is a spectrum diagram of a "3 + 3" type high-order vector soliton;
FIG. 7 is a time domain diagram of a "4 + 4" type high order vector soliton;
FIG. 8 is a spectrum of a "4 + 4" type high-order vector soliton;
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the present invention provides a high-order vector soliton generation system based on a passive resonant cavity, including: the device comprises a continuous wave pump source 1, a first polarization controller 2, a first polarization beam splitter 3, a first modulator 6, a first mode generator 4, a second modulator 7, a second mode generator 5, a polarization beam combiner 8, a coupler 9, a second polarization controller 10, a third polarization controller 11 and a second polarization beam splitter 12;
the continuous wave pump source 1 is connected to an inlet of the first polarization controller 2, an outlet of the first polarization controller 2 is connected to an inlet of the first polarization beam splitter 3, an outlet of 3a of the first polarization beam splitter 3 is connected to a first inlet of the first modulator 6, an outlet of 3b of the first polarization beam splitter 3 is connected to a first inlet of the second modulator 7, the first pattern generator 4 is connected to a second inlet of the first modulator 6, the second pattern generator 5 is connected to a second inlet of the second modulator 7, an outlet of the first modulator 6 is connected to an inlet of 8a of the polarization beam combiner 8, an outlet of the second modulator 7 is connected to an inlet of 8b of the polarization beam combiner 8, an outlet of the polarization beam combiner 8 is connected to an inlet of 9b of the coupler 9, and an inlet of 9a of the coupler 9 is connected to an outlet of the second polarization controller 10, the outlet 9c of the coupler 9 is connected to the inlet of the second polarization controller 10, the outlet 9d of the coupler 9 is connected to the inlet of the third polarization controller 11, and the outlet of the third polarization controller 11 is connected to the inlet of the second polarization beam splitter 12.
In this embodiment, the continuous wave pump source 1 adopts a monochromatic continuous wave laser during simulation, the power of the monochromatic continuous wave laser is 2W, and the wavelength is 1550 nm; wherein, the mark A is the input of pump light, and the mark B is the laser output of high-order vector solitons.
In this embodiment, the combined simulation of the first polarization controller 2 and the first polarization beam splitter 3 is used to realize the separation of orthogonal polarization components, and the splitting ratio of the first polarization beam splitter 3 in the simulation is 50: and 50, outputting the separated laser light from the output port 3a and the output port 3b respectively.
In this embodiment, the first pattern generator 4 and the second pattern generator 5 both use electric pulse generators during simulation, the working power range of the electric pulse generators is 20 to 100W, and the electric pulse generators are used for generating gaussian pulses with preset pulse width, intensity and time delay;
during simulation, according to requirements, the gaussian pulses sequentially generated by the first pattern generator 4 and the second pattern generator 5 are:
(1) two unimodal Gaussian pulses with a pulse width of 20ps, an intensity of 72W and a time interval of 60 ps;
(2) one monomodal gaussian pulse and one bimodal gaussian pulse with a pulse width of 20ps, an intensity of 72W and a time interval of 360ps, wherein the time interval between bimodal gaussian pulses is set to 200 ps;
(3) two bimodal gaussian pulses with a pulse width of 20ps, an intensity of 72W and a time interval of 440ps, wherein the time interval between the bimodal gaussian pulses is set to 200 ps.
In this embodiment, both the first modulator 6 and the second modulator 7 adopt intensity modulation during simulation; the Gaussian pulse signals generated by the first pattern generator 4 and the second pattern generator 5 respectively drive the first modulator 6 and the second modulator 7, and the intensity disturbance is added to the continuous wave pumping field input from the port 3a and the port 3b, so that the continuous wave pumping field added with the intensity disturbance is obtained;
the continuous wave pumping field with the added intensity perturbation comprises: a polarization state u and a polarization state v, the u axis and the v axis being two orthogonal polarization axes;
the polarization state u is represented as:
Ein,u(z,τ)＝Eincos(χ)+Ep,uexp[-τ2/(2τu 2)]f(z)
the polarization state v is represented as:
Ein,v(z,τ)＝Einsin(χ)+Ep,vexp[-(τ-Δτdrift)2/(2τv 2)]f(z)
wherein E isinA continuous wave pumping field output by the continuous wave pumping source 1; ein,u(z,τ)And Ein,v(z,τ)The drive field strengths generated by the first pattern generator 4 and the second pattern generator 5 corresponding to the polarization states u and v, respectively; ep,uAnd Ep,vThe drive field peak intensities for intensity modulation generated by the first pattern generator 4 and the second pattern generator 5 corresponding to the polarization states u and v, respectively; tau isuAnd τvThe pulse widths of the gaussian pulses generated by the first pattern generator 4 and the second pattern generator 5, respectively; delta taudriftIs the drift time of the polarization state v relative to u; f (z) is a rectangular function, f (z) ═ Π (z/L-n)0-1/2) for z ∈ [ n ]0L,(n0+1)L]Z and L are the transmission distance and the cavity length, respectively, and when f (z) is 0, it is expressed in the nth0The rings are injected with an intensity modulation.
In this embodiment, the polarization beam combiner 8 is configured to couple two modulated orthogonally polarized lasers input from the 8a inlet and the 8b inlet, respectively;
the coupling degree of the coupler 9 in simulation is 90: 10, where the references 9a, 9b are the inlet of the coupler 9 and the references 9c, 9d are the 10% outlet, 90% outlet, respectively, of the coupler 9.
In this embodiment, the coupler 9 and the second polarization controller 10 form a passive ring resonator through a polarization maintaining fiber, and the continuous wave pumping field added with the intensity perturbation obtains a vector cavity soliton through the passive ring resonator;
the length of the passive ring resonant cavity is 85m, the repetition frequency is 2.39MHz, the unit length loss is 0.0011/m, the group velocity dispersion is-20 ps2/km, the group velocity mismatch is 1 x 10-13s/m, the wave vector mismatch is-0.0049/m, the Kerr nonlinear coefficient is 1.2 x 10-3/W/m, the coupling efficiency is 0.0026/m, and the linear polarization direction of the pumping field is 0.15 pi;
the second polarization controller 10 adjusts the mismatch of wave vectors according to the two resonances of each polarization mode, ensuring that the laser stop frequency is located in the effective red detuning region;
the evolution formula of the continuous wave pumping field added with the intensity perturbation in the passive annular resonant cavity is as follows:
wherein z is the transmission distance within the cavity; u and v are the slowly varying electric field envelopes of the two polarization states; alpha is alpha1(α -ln (1-k))/(2L), α is the intra-cavity loss, k is the power coupling coefficient, and L is the cavity length; Δ β is the wavevector mismatch between the two polarization modes; delta1＝δ0/L，δ0Is a loop phase mismatch; beta is a2Group velocity dispersion; delta beta1Is a group velocity mismatch; gamma is a Kerr nonlinear coefficient; eta ═ k1/2/L；EinIs a continuous wave pumping field; χ is the linear polarization direction of the pumping field;
the third polarization controller 11 is used for changing the polarization direction of the fundamental order or high order vector solitons output from the 9d outlet and the phase difference between the two orthogonal polarization components, the second polarization beam splitter 12 is coupled with the polarization beam splitter through an optical fiber, the two polarization components of the fundamental order or high order vector solitons generate projections on the horizontal axis and the longitudinal axis of the polarization beam splitter, and the high order vector solitons can be obtained as the projection result.
Referring to fig. 2, the present invention provides a method for generating high-order vector solitons based on a passive resonant cavity, which is implemented based on the above-mentioned system for generating high-order vector solitons based on a passive resonant cavity, and includes:
s1: starting simulation, wherein the continuous wave pumping source 1 generates input laser;
in the specific implementation, the output power of the continuous wave pumping source 1 is set to be 2W during simulation;
s2: the input laser sequentially passes through the first polarization controller 2, the first polarization beam splitter 3, the first modulator 6 and the second modulator 7, and is subjected to intensity modulation under the action of the first mode generator 4 and the second mode generator 5 respectively, so as to obtain a continuous wave pumping field added with intensity perturbation; the coupler 9 and the second polarization controller 10 form the passive ring resonator;
s3: the continuous wave pumping field added with the intensity perturbation sequentially passes through the polarization beam combiner 8 and the coupler 9 and enters the passive ring-shaped resonant cavity to be excited to obtain vector cavity solitons;
s4: the vector cavity solitons sequentially pass through the third polarization controller 11 and the second polarization beam splitter 12, and two polarization orthogonal components of the vector cavity solitons are projected on a horizontal axis and a longitudinal axis of the second polarization beam splitter 12 respectively to obtain a horizontal axis projection result and a longitudinal axis projection result;
the projection process is as follows:
H＝u·cosθ+v·sinθ
V＝u·sinθ-v·cosθ
wherein H represents the projection result of the horizontal axis, V represents the projection result of the vertical axis, and θ represents the angle between the polarization state u and the horizontal axis in the second polarization beam splitter 12;
s5: obtaining a high-order vector soliton according to the two polarization orthogonal components of the vector cavity soliton, the horizontal axis projection result and the longitudinal axis projection result, which specifically comprises the following steps:
for the two vector cavity solitons with polarization orthogonal components of 1+1, if the horizontal axis projection result and the vertical axis projection result are both two pulses, the vector soliton obtained after projection is a 2+2 type high-order vector soliton; the corresponding gaussian pulses output by the first pattern generator 4 and the second pattern generator 5 are: two unimodal Gaussian pulses with a pulse width of 20ps, an intensity of 72W and a time interval of 60 ps; FIG. 3 is a time domain diagram of the "2 + 2" type high-order vector solitons, and FIG. 4 is a spectrum diagram of the "2 + 2" type high-order vector solitons;
for the two vector cavity solitons with polarization orthogonal components of 1+2, if the horizontal axis projection result and the vertical axis projection result are three pulses, the vector soliton obtained after projection is a 3+3 type high-order vector soliton; the corresponding gaussian pulses output by the first pattern generator 4 and the second pattern generator 5 are: one monomodal gaussian pulse and one bimodal gaussian pulse with a pulse width of 20ps, an intensity of 72W and a time interval of 360ps, wherein the time interval between bimodal gaussian pulses is set to 200 ps; FIG. 5 is a time domain diagram of the "3 + 3" type high-order vector solitons, and FIG. 6 is a spectrum diagram of the "3 + 3" type high-order vector solitons;
for the two vector cavity solitons with polarization orthogonal components of 2+2, if the horizontal axis projection result and the vertical axis projection result are both four pulses, the vector soliton obtained after projection is a 4+4 type high-order vector soliton; the corresponding gaussian pulses output by the first pattern generator 4 and the second pattern generator 5 are: two bimodal Gaussian pulses with pulse width of 20ps, intensity of 72W and time interval of 440ps, wherein the time interval between the bimodal Gaussian pulses is set to be 200 ps; fig. 7 is a time domain diagram of the "4 + 4" type high-order vector solitons, and fig. 8 is a spectrum diagram of the "4 + 4" type high-order vector solitons.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third and the like do not denote any order, but rather the words first, second and the like may be interpreted as indicating any order.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A high-order vector soliton generation system based on a passive resonant cavity is characterized by comprising: the device comprises a continuous wave pump source (1), a first polarization controller (2), a first polarization beam splitter (3), a first modulator (6), a first mode generator (4), a second modulator (7), a second mode generator (5), a polarization beam combiner (8), a coupler (9), a second polarization controller (10), a third polarization controller (11) and a second polarization beam splitter (12);
the continuous wave pump source (1) is connected with an inlet of the first polarization controller (2), an outlet of the first polarization controller (2) is connected with an inlet of the first polarization beam splitter (3), an outlet of 3a of the first polarization beam splitter (3) is connected with a first inlet of the first modulator (6), an outlet of 3b of the first polarization beam splitter (3) is connected with a first inlet of the second modulator (7), the first pattern generator (4) is connected with a second inlet of the first modulator (6), the second pattern generator (5) is connected with a second inlet of the second modulator (7), an outlet of the first modulator (6) is connected with an inlet of 8a of the polarization beam combiner (8), an outlet of the second modulator (7) is connected with an inlet of 8b of the polarization beam combiner (8), the outlet of the polarization beam combiner (8) is connected with the inlet of 9b of the coupler (9), the inlet of 9a of the coupler (9) is connected with the outlet of the second polarization controller (10), the outlet of 9c of the coupler (9) is connected with the inlet of the second polarization controller (10), the outlet of 9d of the coupler (9) is connected with the inlet of the third polarization controller (11), and the outlet of the third polarization controller (11) is connected with the inlet of the second polarization beam splitter (12).
2. The passive resonant cavity-based high-order vector soliton generation system according to claim 1, wherein the continuous wave pump source (1) adopts a monochromatic continuous wave laser in simulation, and the power of the monochromatic continuous wave laser is 2W, and the wavelength is 1550 nm.
3. The passive resonant cavity-based high-order vector soliton generation system according to claim 1, wherein the first polarization beam splitter (3) has a splitting ratio of 50: 50.
4. the passive resonant cavity-based high-order vector soliton generation system according to claim 1, wherein the first pattern generator (4) and the second pattern generator (5) both use an electric pulse generator in simulation, the working power of the electric pulse generator is in a range of 20 to 100W, and the electric pulse generator is used for generating gaussian pulses with preset pulse width, intensity and time delay;
during simulation, according to requirements, Gaussian pulses sequentially generated by the first pattern generator (4) and the second pattern generator (5) are as follows:
two unimodal Gaussian pulses with a pulse width of 20ps, an intensity of 72W and a time interval of 60 ps;
one monomodal gaussian pulse and one bimodal gaussian pulse with a pulse width of 20ps, an intensity of 72W and a time interval of 360ps, wherein the time interval between bimodal gaussian pulses is set to 200 ps;
two bimodal gaussian pulses with a pulse width of 20ps, an intensity of 72W and a time interval of 440ps, wherein the time interval between the bimodal gaussian pulses is set to 200 ps.
5. The passive resonant cavity-based high-order vector soliton generation system according to claim 1, wherein the first modulator (6) and the second modulator (7) both adopt intensity modulation during simulation to obtain a continuous wave pumping field added with intensity perturbation;
the continuous wave pumping field with the added intensity perturbation comprises: a polarization state u and a polarization state v, the u axis and the v axis being two orthogonal polarization axes;
the polarization state u is represented as:
Ein,u(z,τ)＝Eincos(χ)+Ep,uexp[-τ2/(2τu 2)]f(z)
the polarization state v is represented as:
Ein,v(z,τ)＝Einsin(χ)+Ep,vexp[-(τ-Δτdrift)2/(2τv 2)]f(z)
wherein E isinA continuous wave pump field output by the continuous wave pump source (1); ein,u(z,τ)And Ein,v(z,τ)Drive field strengths generated by a first pattern generator (4) and a second pattern generator (5) corresponding to the polarization states u and v, respectively; ep,uAnd Ep,vThe drive field peak intensities for intensity modulation generated by a first pattern generator (4) and a second pattern generator (5) corresponding to the polarization states u and v, respectively; tau isuAnd τvThe pulse widths of the Gaussian pulses generated by the first pattern generator (4) and the second pattern generator (5) respectively; delta taudriftIs the drift time of the polarization state v relative to u; f (z) is a rectangular function, f (z) ═ Π (z/L-n)0-1/2) for z ∈ [ n ]0L,(n0+1)L]Z and L are the transmission distance and the cavity length, respectively, and when f (z) is 0, it is expressed in the nth0The rings are injected with an intensity modulation.
6. The passive resonant cavity-based high-order vector soliton generation system according to claim 1, wherein the coupler (9) has a coupling degree of 90: 10.
7. the system for generating high-order vector solitons according to claim 1, wherein said coupler (9) and said second polarization controller (10) form a passive ring resonator through a polarization-maintaining fiber, and said continuous wave pumping field with intensity perturbation added obtains vector cavity solitons through said passive ring resonator;
the evolution formula of the continuous wave pumping field added with the intensity perturbation in the passive annular resonant cavity is as follows:
wherein z is the transmission distance within the cavity; u and v are the slowly varying electric field envelopes of the two polarization states; alpha is alpha1(α -ln (1-k))/(2L), α is the intra-cavity loss, k is the power coupling coefficient, and L is the cavity length; Δ β is the wavevector mismatch between the two polarization modes; delta1＝δ0/L，δ0Is a loop phase mismatch; beta is a2Group velocity dispersion; delta beta1Is a group velocity mismatch; gamma is a Kerr nonlinear coefficient; eta ═ k1 /2/L；EinIs a continuous wave pumping field; χ is the linear polarization direction of the pumping field.
8. A method for generating high-order vector solitons based on a passive resonant cavity is realized based on the system for generating high-order vector solitons based on the passive resonant cavity according to any one of claims 1 to 7, and the method comprises the following steps:
s1: starting simulation, wherein the continuous wave pump source (1) generates input laser;
s2: the input laser sequentially passes through the first polarization controller (2), the first polarization beam splitter (3), the first modulator (6) and the second modulator (7), and is subjected to intensity modulation under the action of the first mode generator (4) and the second mode generator (5) respectively to obtain a continuous wave pumping field added with intensity perturbation; the coupler (9) and the second polarization controller (10) form the passive ring resonator;
s3: the continuous wave pumping field added with the intensity perturbation sequentially passes through the polarization beam combiner (8) and the coupler (9) and enters the passive ring-shaped resonant cavity to be excited to obtain vector cavity solitons;
s4: the vector cavity solitons sequentially pass through the third polarization controller (11) and the second polarization beam splitter (12), and two polarization orthogonal components of the vector cavity solitons are projected on the transverse axis and the longitudinal axis of the second polarization beam splitter (12) respectively to obtain a transverse axis projection result and a longitudinal axis projection result;
the projection process is as follows:
H＝u·cosθ+v·sinθ
V＝u·sinθ-v·cosθ
h represents a horizontal axis projection result, V represents a vertical axis projection result, and theta represents an included angle between a polarization state u and a horizontal axis in the second polarization beam splitter (12);
s5: obtaining a high-order vector soliton according to the two polarization orthogonal components of the vector cavity soliton, the horizontal axis projection result and the longitudinal axis projection result, which specifically comprises the following steps:
for the two vector cavity solitons with polarization orthogonal components of 1+1, if the horizontal axis projection result and the vertical axis projection result are both two pulses, the vector soliton obtained after projection is a 2+2 type high-order vector soliton; the corresponding Gaussian pulses output by the first pattern generator (4) and the second pattern generator (5) are respectively as follows: two unimodal Gaussian pulses with a pulse width of 20ps, an intensity of 72W and a time interval of 60 ps;
for the two vector cavity solitons with polarization orthogonal components of 1+2, if the horizontal axis projection result and the vertical axis projection result are three pulses, the vector soliton obtained after projection is a 3+3 type high-order vector soliton; the corresponding Gaussian pulses output by the first pattern generator (4) and the second pattern generator (5) are respectively as follows: one monomodal gaussian pulse and one bimodal gaussian pulse with a pulse width of 20ps, an intensity of 72W and a time interval of 360ps, wherein the time interval between bimodal gaussian pulses is set to 200 ps;
for the two vector cavity solitons with polarization orthogonal components of 2+2, if the horizontal axis projection result and the vertical axis projection result are both four pulses, the vector soliton obtained after projection is a 4+4 type high-order vector soliton; the corresponding Gaussian pulses output by the first pattern generator (4) and the second pattern generator (5) are respectively as follows: two bimodal gaussian pulses with a pulse width of 20ps, an intensity of 72W and a time interval of 440ps, wherein the time interval between the bimodal gaussian pulses is set to 200 ps.
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