RU2530189C1 - Method for optical amplification of laser radiation - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: method for optical amplification of laser radiation includes dividing source radiation through multiple channels, amplifying the radiation in the channels and forming unidirectional radiation at the output of the channels. The channels used are non-linear optical waveguides with tunnel optical coupling between them. Intensity of optical waves at the input of the waveguides and/or coefficients of tunnel coupling between the waveguides and/or the length of tunnel coupling of the waveguides and/or the wave frequency is selected such that waves at the output of the waveguides are in the same phase.

EFFECT: high rate of generating amplified radiation.

15 cl, 6 dwg

Description

Technical field

The invention relates to the field of laser, nonlinear, integrated and fiber optics.

State of the art

As is well known [1-3], the coherent addition of laser beams allows one to achieve a significant increase in the power of laser systems and improve the directivity of their radiation.

At the same time, a method [4] for optical amplification of high-power laser radiation is known, including separation, amplification in each channel and addition of amplified waves. The known method involves phasing several laser amplification channels. To do this, electronic circuits are used to ensure matching and alignment of the phases of the waves in several optical channels. The disadvantage of this method is the slow response of electronic circuits and, as a result, the relatively slow regulation of the phase difference of the waves and the slow establishment of a zero phase difference. As was emphasized in [4], the circuit worked under conditions of a slow (not faster than 100 ms) change in the radiation phase in the channel. In addition, the installation, including the optical circuit and electronic circuitry, is complex and cumbersome.

Disclosure of invention

The technical result achieved in the claimed method of optical amplification of laser radiation is to increase the rate of formation of amplified radiation by increasing the speed of the regulation of the phase difference of laser radiation in two or more channels. No phasing of channels needed.

These technical results are achieved in a method of optical amplification of laser radiation, including the separation of the initial radiation through several channels, amplification of radiation in the channels and the formation of unidirectional radiation at the exit of the channels, while the channels use nonlinear optical waveguides with tunnel optical coupling between them, and select the intensities of the optical waves at the input of the waveguides, and / or the tunnel coupling coefficients between the waveguides, and / or the tunnel coupling length of the waveguides, and / or wave frequencies in such a way that the waves at the output of the waveguides are in the same phase.

The initial radiation can be previously (before separation) introduced into a nonlinear optical waveguide and then separated by other nonlinear optical waveguides using a tunnel coupling between them.

You can additionally, after amplifying the radiation in the channels, separate the radiation of each channel along several additional nonlinear optical waveguides and amplify the radiation in them, while selecting the intensities of the optical waves at the input of the waveguides, and / or the tunnel coupling coefficients between the additional waveguides, and / or lengths tunnel coupling of additional waveguides, and / or the frequency of the waves in such a way that the waves at the output of the additional waveguides are in the same phase, and unidirectional radiation is generated in the output of additional waveguides. It is possible to further separate and amplify the radiation two or more times, preserving the phase-matching of the waves at the output of the waveguides of each amplification stage. In this case, it is possible to additionally separate the radiation each time, for example, into two channels.

These nonlinear optical waveguides can be made in the form of veins of a fiber waveguide. Fiber optic cores may contain GeO ₂ . They can be doped with rare earth ions and / or metal ions and / or semiconductor particles. As rare earth elements, erbium, yttrium, ytterbium, neodymium, thulium, terbium, and other elements can be used. Bismuth is promising as an alloying metal. As alloying semiconductors and their compounds, CdS, CdSe, CdS _x Se _1-x , GaAs and others can be used. These alloying additives can be used both to increase the nonlinear coefficient of waveguides and to amplify laser radiation. It is possible to amplify laser radiation in channels by creating an inversion of the populations of the energy levels of ions of rare-earth elements or metal ions, for example, bismuth, or semiconductors. To create an inversion of the populations of ions of rare-earth elements, or metal, or semiconductors, diode pump radiation can be used. Typically, these optical waveguides are doped with ions of at least one rare earth element and / or bismuth ions and / or particles of at least one type of semiconductor.

In an important particular case, ultrashort pulses are used as laser radiation, as a rule, solitons or soliton-like pulses that retain their shape. The use of ultrashort pulses makes it possible to eliminate the SMBS phenomenon in optical fibers. Ultrashort pulses, in particular, solitons, can be supplied either as a sequence or as a single pulse.

Typically, the number of fibers in a fiber is more than three.

In particular, these optical waveguides are parallel.

In particular, a central optical waveguide surrounded by several parallel symmetrically located optical waveguides can be used, and there is a tunnel connection between these peripheral waveguides and the central waveguide, when radiation is introduced into the central waveguide with an intensity equal to the “critical” wave intensity at the output of all waveguides, they are aligned . At the same time, the phases of the will are aligned in all the indicated waveguides.

In a particular case, the tunnel coupling between adjacent peripheral waveguides may be absent.

In another, important for practice, special case, nonlinear optical TCOWs can be implemented based on waveguide semiconductor structures. In particular, based on layered nanostructures, for example, GaAs / GaAlAs or In _1-x Ga _x As _y P _1-y heterostructures. In particular, strip and / or channel and / or recessed waveguides can be used. They can also provide optical amplification of laser radiation by creating an inversion of the population of energy levels. The population inversion in this case, as a rule, is created by electric current, which is passed through the semiconductor structure perpendicular to the plane of the layers. The magnitude of this current is usually 10-100 mA. We can talk about semiconductor waveguide amplifiers, tunnel-coupled to each other. Moreover, the optical nonlinearity of these waveguide amplifiers plays a significant role. The use of an array of such amplifiers is very promising.

In a particular case, waveguides based on a semiconductor structure of the MQW type are used, which contain at least two heterojunctions, on which contact metal plates 2 and 3 are fixed to pass through the structure of a nonlinear waveguide a current transverse to the layers of the structure.

As is known [5–10], we discovered the phenomenon of self-switching of unidirectional distribution-coupled waves (ORSV). The foundations of the theory and experimental observation of this phenomenon are described in the review [9, 10]. These waves include a whole class of waves [5-10], including waves in tunnel-coupled optical waveguides (TSOW). Usually we are talking about two waves, for example, waves in two TSOV. However, as was emphasized in [9] and in our other works, the effect of wave self-switching also occurs for a larger number of ODSWs, in particular, for waves in three TSOWs. Since in this method we are primarily interested in TSOW, then further, as a rule, we will talk about self-switching of waves in TSOW.

, где K - коэффициент связи, θ - кубично-нелинейный коэффициент оптического волновода [9].In our works [5–10], it was shown that in the nonlinear regime, when the refractive index of waveguides at each point depends on the wave intensity at this point, this phenomenon of self-switching of light or optical radiation can occur. It lies in the fact that a small change in the intensities or phases of the waves at the input (under certain conditions) causes a sharp change in the ratio of the power of the waves at the output. In the simplest case of introducing radiation into one of the two TCOWs, it arises near the critical input power. Moreover, if TSOV are identical, then the critical intensity is $$\mathrm{four}K/|\; |\; |\theta |\; |\; |$$

, where K is the coupling coefficient, θ is the cubic nonlinear coefficient of the optical waveguide [9].

In this case, we are not even interested in the phenomenon of radiation self-switching, but the concomitant phenomenon - auto-synchronization of waves [7-10].

The fact is that, as was first established by us [7, 8], the phenomenon of self-switching of ODSWs is accompanied by their auto-synchronization, i.e. alignment of phases of waves at the output of optical waveguides. More precisely, it occurs at a certain distance from the entrance of the waveguides and further along their entire length up to the exit (Fig. 2a). It occurs at the midpoint of M. self-switching. The phenomenon of auto-synchronization can also be called automatic phasing of waves or their autophasing.

This phenomenon forms the basis of a new method for controlling the phase difference at the output of optical channels — automatic wave synchronization or auto-synchronization of waves in several optical channels.

One of the most promising applications of this method can be considered its use for regulating the phase difference (synchronization) of waves in optical fibers with many wires in the conditions of amplification of these waves as they propagate. As a rule, amplification is achieved by creating population inversions in these veins, for which the fiber (s) are doped with rare earth ions, for example, erbium, ytterbium or other elements. For example, this method can be used in erbium-doped amplifiers with many conductors. In this case, the population inversion necessary for amplification, as a rule, is created (achieved) due to diode pumping. The principle of operation and the design of erbium and other similar fiber amplifiers are well known (see, for example, [11, 12]).

In the patent [13], the phenomenon of radiation self-switching was considered under conditions when amplification due to population inversion takes place in conductors (ie, optical waveguides). In particular, in [13] the phenomenon of radiation self-switching was considered in an erbium amplifier with two or more conductors that formed a TCOW. Those. [13] considered a combination of the self-switching effect and amplification due to population inversion.

As studies [13] showed, the presence of amplification due to population inversion does not violate the effect of self-switching of waves and the closely related effect of auto-synchronization of waves.

As shown by earlier studies [14], the presence of moderate losses also does not violate the effect of self-switching waves and the closely related effect of auto-synchronization of waves.

Brief Description of the Drawings

The invention is illustrated by figures 1-6.

Figure 1 shows a cross section of a fiber and a possible arrangement of tunnel-coupled optical waveguides (cores) in it.

Figure 2-6 illustrate the phenomenon of auto-synchronization (autophasing) and self-switching of waves in several nonlinear optical TSOV. Figure 2 corresponds to two TCOW, figure 3 corresponds to three TCOW, figure 4 to four TCOW, figure 5 and 6 correspond to five TCOW.

[6-10].Figures 2-6 show the power transfer coefficients of the waveguides T _j = I _jl / I (where I is the sum of the input intensities) and the cosines of the phase difference: cos (φ _j -φ ₀ ), cos (φ _m -φ _j ). On figa, 3, 4, 5 they are presented as functions of the normalized longitudinal coordinate L = 2πKl / (λβ) [6-10]. On figb, c, d and Fig.6 - as a function of the normalized input intensity R ₀ = / I ₀₀ / I _M , where I _M is the critical intensity for identical TCOW equal to $$\mathrm{four}K/|\; |\; |\theta |\; |\; |$$

[6-10].

On figa shows the transmission coefficients of the power T ₀ and T _{1 by the} waveguides "0" and "1" and the cosine of the phase difference: C10 = cos (φ ₁ -φ ₀ ) as a function of L. The input intensity is critical: R ₀ = 1. Losses are zero (δ = 0).

On figb-g. self-switching of waves and their synchronization (at the midpoint M [6-10]) for two TSOWs are shown for zero (δ = 0) (b), positive (δ = K / 10) (c) and negative (δ = -K / 10) (d) loss. L = π.

Fig.2d shows that the effect of auto-synchronization of waves is preserved in the presence of amplification obtained due to the inversion of the medium.

Figure 3 presents the coefficients T ₀ , T ₁ , T ₂ power transmission with three waveguides "0", "1", "2" and the cosines of the phase difference: Cj0 = cos (φ _j -φ ₀ ), C21 = cos (φ _2- φ ₁ ) as a function of L, and three TCOWs are located as in FIG. 1a, with R ₀ = 1, K ₀₁ = K, K ₁₂ = 0.

Figure 4 presents the transmission coefficients of power T ₀ , T ₁ , T ₂ , and T ₃ four waveguides "0", "1", "2", "3" and the cosines of the phase difference: Cj0 = cos (φ _j -φ ₀ ), C21 = cos (φ ₂ -φ ₁ ) = C31 = cos (φ ₃ -φ ₁ ) as a function of L for four TCOWs located as in Fig. 1d, with R ₀ = 1, K ₀₁ = K ₀₂ = K ₀₃ = K, K ₁₂ = 0. Curve 1 + 2 + 3 is a graph of the sum of T ₁ + T ₂ + T ₃ . The curve "0" is a graph of T ₀ . Curve "1" is a graph of T ₁ .

Figure 5 presents the transmission coefficients of power T ₀ , T ₁ , T ₂ , T ₃ , T ₄ five waveguides "0", "1", "2", "3", "4" and the cosines of the phase difference: Cj0 = cos (φ _j -φ ₀ ), C21 = cos (φ ₂ -φ ₁ ), C31 = cos (φ ₃ -φ ₁ ), C41 = cos (φ ₄ -φ ₁ ), C23 = cos (φ ₂ -φ ₃ ), C34 = cos (φ ₃ -φ ₄ ), C24 = cos (φ ₂ -φ ₄ ) as a function of L.

For figa-e five TSOV are located as in figa, with K ₀₁ = K ₀₂ = K ₀₃ = K ₀₄ = K. C21 = C31 = C41 = C23 = C34 = C24. Curve 1 + 2 + 3 + 4 is a graph of the sum of T ₁ + T ₂ + T ₃ + T ₄ . The curve "0" is a graph of T ₀ . The curve "3 + 4" is a graph of the sum of T ₃ + T ₄ . K ₁₂ = 0 (a), K ₁₂ = 0.25K (b), K = 0.5K (c), K ₁₂ = 0.67K (d). For all figure 5, except for "d", R ₀ = 1. For Fig.5d, R ₀ = 0.6, K ₁₂ = 0.25K.

For fig.5e TCOW are located as in fig.1d, with: K ₀₁ = K; K ₂₄ = K; K ₀₂ = K; K ₁₃ = K; K ₀₄ = 0; K ₁₄ = 0; K ₃₄ = 0; K ₀₃ = 0; K ₁₂ = 0; K ₂₃ = 0.

In Fig. 6, the same values are presented as in Fig. 5, but as functions of R ₀ , for various normalized lengths: L = 1.51π, K ₁₂ = 0 (a); L = 1.57π, K ₁₂ = K / 4 (b); L = 1.6π, K ₁₂ = 0 (c); L = 1.51π, K ₁₂ = K / 4 (g).

The implementation of the invention

The amplification of waves due to population inversion does not violate the effect of self-switching of waves and the closely related effect of auto-synchronization of waves. On fig.2g it is seen that the waves are synchronized in the case of amplification. Figure 2d is constructed for the case of two TCOWs, but similar synchronization takes place for a larger number of waveguides.

Consider the case when there is a central optical waveguide surrounded by several peripheral symmetrically located optical waveguides (Fig. 1), and there is a tunnel coupling between these peripheral waveguides and the central waveguide. In this case, when radiation is introduced into the central waveguide with an intensity equal to the “critical” wave intensity at the output of all waveguides, they are aligned (Figs. 4, 5) at a certain distance from the input. At the same time, the phases of the waves in all of these waveguides are aligned (Figs. 4, 5).

With a decrease in the coupling coefficients between the peripheral waveguides (i.e., the coefficients K ₁₂ , K ₁₃ , K ₁₄ , K ₂₄ , K ₃₄ , etc.), the length of the TSOW section increases, where the cosine of the phase difference of the waves is close to unity (Fig. 4 , 5). Therefore, to increase the length of the TCOW section, where the waves become in-phase, the coupling coefficient between the peripheral waveguides should be reduced. Special technological methods can reduce them down to zero.

With the same coupling coefficient between the peripheral waveguides, a decrease in the input intensity (from critical to 0.6 critical) reduces the TCOW section, where the cosine of the phase difference of the waves is close to unity (Figs. 5c, 5d).

If amplification is present: δ <0, then (sections) of the region appear where cos (ψ ₁₀ ) <0 (Fig. 2d). Positive losses shift the synchronization point to the region of higher (than R ₀ = 1) input intensities (Fig.2c).

Negative losses (δ <0), on the contrary, shift the synchronization point to the region of lower (than R ₀ = 1) input intensities. Negative losses mean amplification. As a rule, it is achieved by doping veins with ions of rare-earth elements (for example, erbium) and creating population inversions on these ions, usually due to diode pumping.

The graphs in figure 2-6 are based on mathematical modeling of the interaction of optical waves in several nonlinear optical TSOV.

In [9] and our other works, equations were given for two and three nonlinear optical TCOWs. These equations can easily be generalized to the case of a larger number of nonlinear optical TSOWs. The interaction of the will in several, for example, in five nonlinear optical TSOWs, is described by a system of equations for slowly varying amplitudes A _{j of} these waves:

$$i\frac{\partial A_0}{\partial z}=K_{01}{A}_{\mathrm{one}}\exp (iz{\alpha }_{10})+K_{02}{\mathrm{<figure-callout\; id="2"\; label="A"\; filenames="00000015.png,00000016.png"\; state="\{\{state\}\}">A</figure-callout>}}_2\exp (iz{\alpha }_{\mathrm{twenty}})+K_{03}{\mathrm{<figure-callout\; id="3"\; label="A"\; filenames="00000016.png,00000017.png"\; state="\{\{state\}\}">A</figure-callout>}}_3\exp (iz{\alpha }_{\mathrm{thirty}})+K_{04}{A}_{\mathrm{four}}\exp (iz{\alpha }_{40})+{\mathrm{<figure-callout\; id="0"\; label="\theta "\; filenames="00000011.png,00000012.png"\; state="\{\{state\}\}">\theta </figure-callout>}}_0{|\; |\; |A_0|\; |\; |}^2{A}_0-i{\delta }_0{\mathrm{<figure-callout\; id="0"\; label="A"\; filenames="00000011.png,00000012.png"\; state="\{\{state\}\}">A</figure-callout>}}_0$$

$$i\frac{\partial A_{\mathrm{one}}}{\partial z}=K_{10}{\mathrm{<figure-callout\; id="0"\; label="A"\; filenames="00000011.png,00000012.png"\; state="\{\{state\}\}">A</figure-callout>}}_0\exp (-iz{\alpha }_{10})+K_{12}{\mathrm{<figure-callout\; id="2"\; label="A"\; filenames="00000015.png,00000016.png"\; state="\{\{state\}\}">A</figure-callout>}}_2\exp (iz{\alpha }_{21})+K_{13}{\mathrm{<figure-callout\; id="3"\; label="A"\; filenames="00000016.png,00000017.png"\; state="\{\{state\}\}">A</figure-callout>}}_3\exp (iz{\alpha }_{31})+K_{\mathrm{fourteen}}{A}_{\mathrm{four}}\exp (iz{\alpha }_{41})+{\theta }_{\mathrm{one}}{|\; |\; |A_{\mathrm{one}}|\; |\; |}^2{A}_{\mathrm{one}}-i{\delta }_{\mathrm{one}}{A}_{\mathrm{one}}$$

$$i\frac{\partial A_2}{\partial z}=K_{\mathrm{twenty}}{A}_0\exp (-iz{\alpha }_{\mathrm{twenty}})+K_{21}{A}_{\mathrm{one}}\exp (-iz{\alpha }_{21})+K_{23}{\mathrm{<figure-callout\; id="3"\; label="A"\; filenames="00000016.png,00000017.png"\; state="\{\{state\}\}">A</figure-callout>}}_3\exp (iz{\alpha }_{32})+K_{24}{A}_{\mathrm{four}}\exp (iz{\alpha }_{42})+{\mathrm{<figure-callout\; id="2"\; label="\theta "\; filenames="00000015.png,00000016.png"\; state="\{\{state\}\}">\theta </figure-callout>}}_2{|\; |\; |A_2|\; |\; |}^2{A}_2-i{\delta }_2{\mathrm{<figure-callout\; id="2"\; label="A"\; filenames="00000015.png,00000016.png"\; state="\{\{state\}\}">A</figure-callout>}}_2$$

$$i\frac{\partial A_3}{\partial z}=K_{\mathrm{thirty}}{A}_0\exp (-iz{\alpha }_{\mathrm{thirty}})+K_{31}{A}_{\mathrm{one}}\exp (-iz{\alpha }_{31})+K_{32}{\mathrm{<figure-callout\; id="2"\; label="A"\; filenames="00000015.png,00000016.png"\; state="\{\{state\}\}">A</figure-callout>}}_2\exp (-iz{\alpha }_{32})+K_{34}{A}_{\mathrm{four}}\exp (iz{\alpha }_{43})+{\mathrm{<figure-callout\; id="3"\; label="\theta "\; filenames="00000016.png,00000017.png"\; state="\{\{state\}\}">\theta </figure-callout>}}_3{|\; |\; |A_3|\; |\; |}^2{A}_3-i{\delta }_3{\mathrm{<figure-callout\; id="3"\; label="A"\; filenames="00000016.png,00000017.png"\; state="\{\{state\}\}">A</figure-callout>}}_3$$

$$\begin{array}{l}i\frac{\partial A_{\mathrm{four}}}{\partial z}=K_{40}{\mathrm{<figure-callout\; id="0"\; label="A"\; filenames="00000011.png,00000012.png"\; state="\{\{state\}\}">A</figure-callout>}}_0\exp (-iz{\alpha }_{40})+K_{41}{A}_{\mathrm{one}}\exp (-iz{\alpha }_{41})+K_{42}{\mathrm{<figure-callout\; id="2"\; label="A"\; filenames="00000015.png,00000016.png"\; state="\{\{state\}\}">A</figure-callout>}}_2\exp (-iz{\alpha }_{42})+K_{43}{\mathrm{<figure-callout\; id="3"\; label="A"\; filenames="00000016.png,00000017.png"\; state="\{\{state\}\}">A</figure-callout>}}_3\exp (iz{\alpha }_{43})+\\ +{\theta }_{\mathrm{four}}{|\; |\; |A_{\mathrm{four}}|\; |\; |}^2{A}_{\mathrm{four}}-i{\delta }_{\mathrm{four}}{A}_{\mathrm{four}}\end{array}$$

where the notation [5-10] is used, in particular:

zπ / (λ / β) → z, K _ij = K _ji are the tunneling coupling coefficients, α _jm = β _j -β _m , β _j is the effective refractive index of the jth waveguide,

θ ₀ , θ ₁ , θ ₂ , θ ₃ , θ ₄ are cubic nonlinear coefficients [9], δ _m is the loss coefficient in the waveguide with number m. For identical waveguides, α _jm = 0.

The interaction of waves in a larger number of nonlinear optical TCOWs is described by similar equations. Those. the above system of equations can easily be generalized to the case of a larger number of waveguides. For example, if the number of waveguides is n, then the amplitude in the waveguide with number m has the form:

, $$\frac{\partial A_m}{\partial z}={\displaystyle \sum _j^n{K}_{mj}{A}_j\exp (iz{\alpha }_{jm})+{\theta }_m{|\; |\; |A_m|\; |\; |}^2{A}_m-i{\delta }_m{A}_m}$$

,

where α _jm = -α _mj .

If TSOV are located as shown in fig.1d, then we can assume K ₀₁ = K; K ₂₄ = K; K ₀₂ = K; K ₁₃ = K; K ₀₄ = 0; K ₁₄ = 0; K ₃₄ = 0; K ₀₃ = 0; K ₁₂ = 0; K ₂₃ = 0.

If TSOV are located as shown in fig.1e, then K ₀₁ = K ₀₂ = K ₀₃ = K ₀₄ = K, K ₁₂ = K ₂₃ = K ₃₄ = K ₁₄ = K ₁₃ = K ₂₄ , and the connection between the waveguides 1 and 2, 2 and 3, 3 and 4, 1 and 4 - either small: K ₁₂ = K ₂₃ = K ₃₄ = K ₁₄ = K / 4, or none at all: K ₁₂ = K ₂₃ = K ₃₄ = K ₁₄ = 0.

Figure 2-6 shows the results for identical waveguides α _jm = β _j -β _m = 0.

. Эти параметры можно выбирать выбором интенсивности оптических волн на входе волноводов, и/или коэффициентов туннельной связи между волноводами, и/или длин туннельной связи волноводов, и/или частот взаимодействующих волн. Как правило, взаимодействующие волны имеют одну несущую частоту (длину волны). Коэффициенты связи между волноводами можно задавать выбором расстояний (зазора) между волноводами и выбором частоты (длины волны) взаимодействующих волн, а также выбором определенной Δn - разности показателей жил и оболочки. Как известно, частота (длина волны) взаимодействующих волн сильно влияет на коэффициент туннельной связи между волноводами.The nature of the interaction is determined by the parameters R = I ₀₀ / I _M and L = 2πlK / λβ, and $$I_M=\mathrm{four}K/|\; |\; |\theta |\; |\; |$$

. These parameters can be selected by choosing the intensity of the optical waves at the input of the waveguides, and / or the tunnel coupling coefficients between the waveguides, and / or the tunnel coupling lengths of the waveguides, and / or the frequencies of the interacting waves. As a rule, interacting waves have one carrier frequency (wavelength). The coupling coefficients between the waveguides can be set by choosing the distances (gap) between the waveguides and choosing the frequency (wavelength) of the interacting waves, as well as by choosing a specific Δn - the difference between the conductors and the sheath. As is known, the frequency (wavelength) of interacting waves strongly affects the coefficient of tunnel coupling between waveguides.

By selecting the coupling coefficients, input wave powers, gain (due to population inversion) and waveguide length (or wavelength), you can get good output wave synchronization.

Literature

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[3] A.N. Matveev. Optics. Higher School, Moscow, 1985.

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[5]. A.A. Mayer. "Optical transistors and bistable elements based on nonlinear light transmission by systems with unidirectional coupled waves." - Quantum Electronics, 1982, vol. 9, No. 11, p. 2296-2302.

[6]. A.A. Mayer. "On the self-switching of light in a directional coupler." - Quantum Electronics, 1984, v. 11, No. 1, p. 157-162.

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[8]. A.A. Meyer "Auto-synchronization of waves during self-switching of light in nonlinear tunnel-coupled waveguides." - Preprint IOFAN M., 1984, No. 236, p.1-11; Quantum Electronics, vol. 12, 1985, pp. 1537-1540.

[9] A.A. Mayer. "Optical self-switching of unidirectional distributed-coupled waves." UFN, 1995, v. 165, No. 9, pp. 1037-1075.

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[14] A.A. Mayer. Preprint IOFAN, M., 1985, No. 334, pp. 1-20; Quantum Electronics, 1987, v. 14, No. 8, p. 1596-1603.

Claims (15)

1. The method of optical amplification of laser radiation, including the separation of the initial radiation across several channels, amplification of radiation in the channels and the formation of unidirectional radiation at the exit of the channels, characterized in that the channels use nonlinear optical waveguides with tunnel optical communication between them, while selecting the intensities of the optical waves at the input of the waveguides, and / or the tunnel coupling coefficients between the waveguides, and / or the tunnel coupling length of the waveguides, and / or the frequency of the waves so that o waves at the output of the waveguides are in the same phase. 2. The method according to claim 1, characterized in that the initial radiation is preliminarily introduced into a nonlinear optical waveguide and separated by other nonlinear optical waveguides using a tunnel coupling between them. 3. The method according to claim 1, characterized in that in addition, after amplifying the radiation in the channels, the radiation of each channel is separated by several additional nonlinear optical waveguides, in which the radiation is amplified, and the intensities of the optical waves at the input of the waveguides are selected, and / or tunnel coupling coefficients between additional waveguides, and / or tunnel coupling lengths of additional waveguides, and / or wave frequencies so that waves at the output of additional waveguides turn out to be in the same phase, and one-way Aided radiation is formed at the output of additional waveguides. 4. The method according to claim 3, characterized in that it further separates and amplifies the radiation two or more times, while maintaining the in-phase waves at the output of the waveguides of each amplification stage. 5. The method according to claim 4, characterized in that each time an additional separation of radiation is produced into two channels. 6. The method according to claim 1, characterized in that said non-linear optical waveguides are made in the form of fiber optic wires. 7. The method according to claim 6, characterized in that the fibers of the fiber contain GeO ₂ and / or are doped with rare earth ions and / or metal ions. 8. The method according to claim 7, characterized in that the veins of the fiber are doped with ions of erbium and / or neodymium and / or yttrium and / or ytterbium or bismuth. 9. The method according to claim 1, characterized in that the laser radiation is amplified in the channels, creating an inversion of the population of the energy levels of the ions of rare-earth elements, or metal ions, or particles of semiconductors. 10. The method according to claim 9, characterized in that to create the indicated population inversion, diode pumping is used. 11. The method according to claim 1, characterized in that said optical waveguides are doped with ions of at least one rare-earth element and / or bismuth ions and / or particles of at least one type of semiconductor. 12. The method according to claim 1, characterized in that they amplify ultrashort pulses of laser radiation. 13. The method according to p. 12, characterized in that the amplify optical solitons. 14. The method according to claim 1, characterized in that as non-linear optical tunnel-coupled waveguides use optical waveguides based on waveguide semiconductor structures. 15. The method according to 14, characterized in that the inversion of the populations of the energy levels is created by passing an electric current through the waveguides.

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