High repetition rate crosstalk-free dual-comb fiber laser based on mechanical sharing

Abstract

The application discloses a high-repetition-frequency crosstalk-free dual-comb fiber laser based on mechanical sharing, which comprises a pump source, an optical coupler, a tunable optical attenuator, a first wave division multiplexer and a second wave division multiplexer. The pump end of the first wave division multiplexer is connected with the output end of the tunable optical attenuator, and the pump end of the second wave division multiplexer is connected with the third port of the optical coupler. The first resonant cavity comprises a dielectric film, a first doped optical fiber, a first single-mode optical fiber and a semiconductor saturable absorber mirror which are sequentially connected, and the first doped optical fiber is connected with the common end of the first wave division multiplexer. The second resonant cavity comprises a dielectric film, a second doped optical fiber, a second single-mode optical fiber and a semiconductor saturable absorber mirror which are sequentially connected, and the second doped optical fiber is connected with the common end of the second wave division multiplexer. The fiber part of the first resonant cavity and the fiber part of the second resonant cavity are closely arranged at the same position to realize mechanical sharing. The laser of the application can obtain crosstalk-free dual-comb output with higher repetition frequency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical frequency comb, and particularly relates to a high-repetition-frequency crosstalk-free dual-comb fiber laser based on mechanical sharing. BACKGROUND

[0002] Optical frequency comb is a series of equidistant pulses in time domain and a series of equidistant teeth in frequency domain. Dual-comb technology uses two optical frequency combs with slightly different repetition frequencies to perform asynchronous sampling in time domain and multi-heterodyne interference in frequency domain. Therefore, the beat signal can be down-converted from high-frequency optical frequency domain to low-frequency radio frequency domain, so that the information in the optical frequency domain can be reflected to the radio frequency domain, and high-speed and high-resolution optical measurement can be realized. At present, dual-comb systems have been widely used in the fields of spectroscopy, optical imaging, distance measurement, etc.

[0003] In the traditional dual-comb system, two independent mode-locked lasers with a certain difference in repetition frequency are used as dual-comb light sources. In order to ensure the mutual coherence of the two lasers, an optoelectronic servo system for locking the repetition frequency and the carrier offset frequency is usually introduced. Therefore, such a system not only has a complex structure, but also has a high cost. The emerging single-cavity dual-comb fiber laser can simultaneously generate two mode-locked frequency combs with different repetition frequencies in a single resonant cavity. Due to the common mode noise suppression ability brought by the common resonant cavity, the two optical frequency combs can obtain good relative stability without servo feedback. At present, single-cavity dual-comb lasers are mainly based on wavelength multiplexing, bidirectional multiplexing and polarization multiplexing methods, and have lower cost and simpler structure.

[0004] However, in the current single-cavity dual-comb fiber laser, due to the co-cavity of the two optical frequency combs, there is inevitable interaction between the two optical frequency combs in the cavity, that is, the crosstalk problem. The existence of crosstalk not only affects the mode-locking quality, but also reduces the signal-to-noise ratio of the dual-comb interference signal. On the other hand, due to the mode competition between the two optical frequency combs in the single-cavity dual-comb laser, when the resonant cavity length is shortened to increase the repetition frequency of the optical frequency comb, the gain and nonlinear effects in the cavity will be reduced, making it difficult for the two optical frequency combs to be mode-locked simultaneously. Therefore, the repetition frequency of the single-cavity dual-comb mode-locked laser is relatively low. The repetition frequency and the repetition frequency difference play an important role in the application of dual-comb measurement. Increasing the repetition frequency can make the optical frequency comb have wider mode spacing, and a single comb tooth has higher energy, which helps to improve the signal-to-noise ratio of the interference signal. In addition, without violating the Nyquist sampling theorem, a higher repetition frequency allows a higher repetition frequency difference, which means that on the one hand, a higher sampling rate can be obtained, and on the other hand, more interference signals can be obtained in a unit of time for averaging, which also helps to improve the signal-to-noise ratio.

[0005] In the current single-cavity dual-comb fiber laser, the signal crosstalk between the frequency combs and the low repetition frequency are common problems, which are not conducive to some dual-comb precision measurement applications requiring high signal-to-noise ratio and high repetition frequency. SUMMARY

[0006] The present application aims to at least partially solve one of the technical problems in the related art. To this end, the first object of the present application is to propose a high-repetition-frequency dual-comb fiber laser without crosstalk based on mechanical sharing, which can generate dual-combs without crosstalk problem, and can obtain higher repetition frequency compared to general single-cavity dual-comb fiber lasers, and is suitable for precision measurement field.

[0007] To achieve the above object, the first aspect of the present application proposes a high-repetition-frequency dual-comb fiber laser without crosstalk based on mechanical sharing, comprising:

[0008] a pump source for emitting pump light;

[0009] an optical coupler, a first port of the optical coupler being connected with the pump source;

[0010] a tunable optical attenuator, an input end of the tunable optical attenuator being connected with a second port of the optical coupler;

[0011] a first wavelength division multiplexer, a pump end of the first wavelength division multiplexer being connected with an output end of the tunable optical attenuator;

[0012] a second wavelength division multiplexer, a pump end of the second wavelength division multiplexer being connected with a third port of the optical coupler;

[0013] a first resonant cavity, the first resonant cavity comprising a dielectric film, a first doped optical fiber, a first single-mode optical fiber and a semiconductor saturable absorber mirror connected in sequence, the first doped optical fiber being connected with a common end of the first wavelength division multiplexer;

[0014] a second resonant cavity, the second resonant cavity comprising the dielectric film, a second doped optical fiber, a second single-mode optical fiber and the semiconductor saturable absorber mirror connected in sequence, the second doped optical fiber being connected with a common end of the second wavelength division multiplexer;

[0015] The first doped optical fiber and the second doped optical fiber are packaged into a multi-core optical fiber structure to share the pump source; the first single-mode optical fiber and the second single-mode optical fiber are packaged into a multi-core optical fiber structure to share the semiconductor saturable absorber mirror; the fiber part of the first resonant cavity and the fiber part of the second resonant cavity are closely arranged at the same position to realize mechanical sharing, wherein the length of the fiber part of the first resonant cavity and the fiber part of the second resonant cavity is adjustable.

[0016] In addition, the high-repetition-rate non-crosstalk dual-comb laser based on mechanical sharing according to the above-mentioned embodiments of the present application can further have the following additional technical features:

[0017] According to an embodiment of the present application, the first doped fiber and the second doped fiber, and the first single-mode fiber and the second single-mode fiber achieve mechanical sharing of the first resonant cavity and the second resonant cavity by means of gluing.

[0018] According to another embodiment of the present application, the first doped fiber and the second doped fiber, and the first single-mode fiber and the second single-mode fiber achieve mechanical sharing of the first resonant cavity and the second resonant cavity in the form of a direct multi-core fiber.

[0019] According to an embodiment of the present application, the semiconductor saturable absorber mirror is directly coupled with the multi-core fiber end face of the first single-mode fiber and the second single-mode fiber, respectively.

[0020] According to an embodiment of the present application, the spots of the first resonant cavity and the second resonant cavity are separated in space on the semiconductor saturable absorber mirror, avoiding pulse crosstalk.

[0021] According to an embodiment of the present application, the first doped fiber and the second doped fiber adopt a high-gain fiber with an absorption coefficient exceeding 80 dB / m at 1530 nm, which can ensure sufficient gain when the length of the intra-cavity fiber is shortened, realizing high-repetition-rate mode-locked pulses.

[0022] According to an embodiment of the present application, the dielectric film is formed by covering a plurality of SiO2 / Ta2O5 dielectric films on the end face of the fiber jacket through a plasma sputtering deposition system, and the dielectric film serves as a dichroic mirror, completely transmitting the pump light and partially reflecting the resonant laser wavelength.

[0023] According to an embodiment of the present application, the pump source divides the pump light into two parts through the optical coupler, one part enters the first wavelength division multiplexer pump end after passing through the tunable optical attenuator, and the other part directly enters the second wavelength division multiplexer pump end, the common end of the first wavelength division multiplexer and the common end of the second wavelength division multiplexer are packaged into a multi-core fiber structure, the common end of the first wavelength division multiplexer is fiber-coupled with the first doped fiber for coupling the pump light into the first resonant cavity, and the common end of the second wavelength division multiplexer is fiber-coupled with the second doped fiber for coupling the pump light into the second resonant cavity.

[0024] According to an embodiment of the present application, the optical coupler is a 1x2 coupler, and one end with a high splitting ratio serves as the second port of the optical coupler and is connected with the input end of the tunable optical attenuator.

[0025] According to one embodiment of the present application, the multi-core fiber-like structure is formed by packaging two corresponding optical fibers in the same ceramic ferrule; or directly using a multi-core fiber for flange coupling.

[0026] The present application has the following beneficial effects by adopting the above technical solutions:

[0027] (1) The dual-comb fiber laser provided by the present application has two independent resonant cavities, so there is no mutual crosstalk between the output asynchronous pulses; and unlike the single-cavity dual-comb fiber laser, there is no mode competition between the asynchronous pulses when they are mode-locked, so it is easier to achieve asynchronous pulse mode-locked with a higher repetition frequency;

[0028] (2) The laser provided by the present application can adjust the repetition frequency difference between the output asynchronous pulses by adjusting the length difference of the optical fibers in the two resonant cavities;

[0029] (3) The laser provided by the present application can adjust the energy difference in the two resonant cavities by adjusting the tunable optical attenuator, thereby adjusting the radio frequency signal of the dual-comb beat frequency, and avoiding spectral aliasing of the radio frequency signal near the Nyquist bandwidth.

[0030] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 FIG. 1 is a structural schematic diagram of a high-repetition-frequency non-crosstalk dual-comb fiber laser based on mechanical sharing according to an embodiment of the present application;

[0032] Figure 2 FIG. 4 is a structural schematic diagram of a multi-core fiber-like structure according to one embodiment of the present application.

[0033] 1, pump source; 2, optical coupler; 21, first port of the optical coupler; 22, second port of the optical coupler; 23, third port of the optical coupler; 3, tunable optical attenuator; 4, first wavelength division multiplexer; 41, pump port of the first wavelength division multiplexer; 42, common port of the first wavelength division multiplexer; 43, signal port of the first wavelength division multiplexer; 5, second wavelength division multiplexer; 51, pump port of the second wavelength division multiplexer; 52, common port of the second wavelength division multiplexer; 53, signal port of the second wavelength division multiplexer; 6, first resonant cavity; 60, dielectric film; 61, first doped optical fiber; 62, first single-mode optical fiber; 63, semiconductor saturable absorber; 7, second resonant cavity; 71, second doped optical fiber; 72, second single-mode optical fiber. DETAILED DESCRIPTION

[0034] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0035] The following description, with reference to the accompanying drawings, describes a high-repetition-rate crosstalk-free dual-comb fiber laser based on mechanical sharing, according to an embodiment of the present invention.

[0036] like Figure 1 As shown, the high repetition rate crosstalk-free dual-comb fiber laser based on mechanical sharing according to an embodiment of the present invention includes: a pump source 1 for emitting pump light; an optical coupler 2, the first port 21 of which is connected to the pump source 1; a tunable optical attenuator 3, the input end of which is connected to the second port 22 of the optical coupler 2; a first wavelength division multiplexer 4, the pump end 41 of which is connected to the output end of the tunable optical attenuator 3; a second wavelength division multiplexer 5, the pump end 51 of which is connected to the third port 23 of the optical coupler 2; and a first resonant cavity 6, which includes a dielectric film 60, a first doped fiber 61, a first single-mode fiber 62, and a semiconductor saturable absorber mirror 63 connected in sequence. A doped optical fiber 61 is connected to the input terminal 42 of the first wavelength division multiplexer 4; a second resonant cavity 7 includes a dielectric film 60, a second doped optical fiber 71, a second single-mode optical fiber 72, and a semiconductor saturable absorber mirror 63 connected in sequence; the second doped optical fiber 71 is connected to the input terminal 52 of the second wavelength division multiplexer 5; the first doped optical fiber 61 and the second doped optical fiber 71 are packaged into a multi-core fiber-like structure to share a pump source; the first single-mode optical fiber 62 and the second single-mode optical fiber 72 are packaged into a multi-core fiber-like structure to share a semiconductor saturable absorber mirror 63; the optical fiber portion of the first resonant cavity 6 and the optical fiber portion of the second resonant cavity 7 are closely arranged in the same position to achieve mechanical sharing, wherein the lengths of the optical fiber portion of the first resonant cavity 6 and the optical fiber portion of the second resonant cavity 7 are adjustable.

[0037] Specifically, the pump light emitted from pump source 1 enters optical coupler 2, which splits the pump light into two parts and pumps them into the first resonant cavity 6 and the second resonant cavity 7 respectively. The tunable optical attenuator 3 can adjust the pump power difference between the first resonant cavity 6 and the second resonant cavity 7. The first wavelength division multiplexer 4 can input pump light into the first resonant cavity 6 and output the laser in the first resonant cavity 6. The second wavelength division multiplexer 5 can input pump light into the second resonant cavity 7 and output the laser in the second resonant cavity 7.

[0038] Further, in the first resonant cavity 6 and the second resonant cavity 7, the dielectric film 60 acts as a dichroic mirror, which is partially reflective to the output laser and partially transmissive to the pump light, and together with the semiconductor saturable absorber mirror 63 forms the reflective end face of the first resonant cavity 6 and the second resonant cavity 7; the first doped optical fiber 61 and the second doped optical fiber 71 absorb the pump light through the doped ions and emit laser of a desired wavelength (e.g. 1550 nm) through stimulated emission; the first single-mode optical fiber 62 and the second single-mode optical fiber 72 can provide sufficient nonlinear effect to facilitate pulse mode locking; the semiconductor saturable absorber mirror 63 acts as a mode locker, which has high absorption to low-intensity light and high transmission to high-intensity light. The first single-mode optical fiber 62 and the second single-mode optical fiber 72 are packaged into a multi-core optical fiber structure and connected to the same semiconductor saturable absorber mirror 63. Since the dielectric film 60 is partially reflective to the 1550 nm laser, the laser oscillates back and forth through the dielectric film 60 and the semiconductor saturable absorber mirror 63, and part of the light is output to the outside of the first resonant cavity 6 and the second resonant cavity 7 through the dielectric film 60, and finally output through the signal end 43 of the first wavelength division multiplexer 4 and the signal end 53 of the second wavelength division multiplexer 5, respectively. And since the semiconductor saturable absorber mirror 63 has high absorption to low-intensity light and high transmission to high-intensity light, the pulse width gradually decreases during the back-and-forth oscillation of the laser, and finally pulse mode locking is achieved. Since the fiber part of the first resonant cavity 6 and the fiber part of the second resonant cavity 7 are closely arranged at the same position, mechanical sharing of environmental noise can be achieved to obtain relatively stable dual-comb output. In addition, since the length of the fiber part of the first resonant cavity 6 and the fiber part of the second resonant cavity 7 is adjustable, different asynchronous pulses can be achieved by controlling the length of the fiber. In some embodiments of the present application, the total cavity length of the mechanically shared first resonant cavity 6 and the second resonant cavity 7 can be flexibly controlled in the range of cm to m, and the repetition frequency is in the range of 100 MHz to GHz.

[0039] Therefore, the high-repetition frequency and non-crosstalk dual-comb fiber laser based on mechanical sharing according to the embodiment of the application can realize good self-starting mode locking by adjusting the power of the pump source 1. Since the first resonant cavity 6 and the second resonant cavity 7 are independent of each other, there is no crosstalk and mode competition problem between asynchronous pulses in the cavities, and therefore a dual-comb output with high signal-to-noise ratio and high repetition frequency can be obtained. The repetition frequency of the pulses output by the first resonant cavity 6 and the second resonant cavity 7 is determined by the cavity length of each cavity, and therefore the repetition frequency difference between asynchronous pulses can be controlled by the length difference between the two cavities. In addition, the radio frequency signal generated by the beat frequency of the dual-comb can be adjusted to the position of the radio frequency signal in the radio frequency domain by adjusting the adjustable optical attenuator, and the signal spectrum aliasing near the Nyquist sideband can be avoided, which affects the measurement results of the dual-comb application. The fiber parts of the first resonant cavity 6 and the second resonant cavity 7 are closely arranged at the same position, and good environmental noise sharing capability is obtained, so that the asynchronous pulses can obtain good relative stability without an additional servo system.

[0040] According to an embodiment of the application, the first doped optical fiber 61 and the second doped optical fiber 71, and the first single-mode optical fiber 62 and the second single-mode optical fiber 72 realize mechanical sharing of the first resonant cavity 6 and the second resonant cavity 7 by means of gluing. It should be noted that the method is not limited to gluing, and similar methods such as gluing can be used, as long as the two resonant cavities are closely combined to share environmental disturbances.

[0041] According to another embodiment of the application, the first doped optical fiber 61 and the second doped optical fiber 71, and the first single-mode optical fiber 62 and the second single-mode optical fiber 72 realize mechanical sharing of the first resonant cavity 6 and the second resonant cavity 7 in the form of a multi-core optical fiber.

[0042] In some embodiments of the application, the first doped optical fiber 61 and the second doped optical fiber 71 are of the model Er80-8 / 125, and the first single-mode optical fiber 62 and the second single-mode optical fiber 72 are of the model SMF-28e.

[0043] According to an embodiment of the application, the semiconductor saturable absorber mirror 63 is directly coupled to the multi-core optical fiber end face of the first single-mode optical fiber 62 and the second single-mode optical fiber 72, respectively. Since the first resonant cavity 6 and the second resonant cavity 7 share one semiconductor saturable absorber mirror 63, they have similar mode-locked pulse characteristics.

[0044] According to an embodiment of the application, the spot of the first resonant cavity 6 and the spot of the second resonant cavity 7 are separated in space on the semiconductor saturable absorber mirror 63. In this way, the pulse crosstalk problem caused by the shared absorber can be avoided.

[0045] According to one embodiment of the present application, the first doped fiber and the second doped fiber are high-gain fibers with an absorption coefficient of more than 80 dB / m at 1530 nm, which can ensure sufficient gain when the length of the intra-cavity fiber is shortened, and realize high-repetition-rate mode-locked pulses.

[0046] According to one embodiment of the present application, the dielectric film 60 is formed by a plasma sputtering deposition system to cover the multi-layer SiO2 / Ta2O5 dielectric film 60 on the end face of the fiber jacket, and the dielectric film 60 acts as a dichroic mirror, which is completely transmissive to the pump light and partially reflective to the resonant laser wavelength. The dielectric film 60 has a transmittance of up to 97% for the pump light at 980 nm, and a reflectivity of 83% for the light at a wavelength of about 1550 nm.

[0047] According to one embodiment of the present application, the pump source 1 divides the pump light into two parts through the optical coupler 2, one part enters the first wavelength division multiplexer 4 after passing through the tunable optical attenuator 3, and the other part directly enters the second wavelength division multiplexer 5. The common end of the first wavelength division multiplexer 4 and the common end of the second wavelength division multiplexer 5 are packaged into a multi-core fiber structure. The input end 42 of the first wavelength division multiplexer 4 is optically coupled with the first doped fiber 61 for coupling the pump light into the first resonant cavity 6. The input end 52 of the second wavelength division multiplexer 5 is optically coupled with the second doped fiber 71 for coupling the pump light into the second resonant cavity 7.

[0048] According to one embodiment of the present application, the optical coupler 2 is a 1x2 coupler, and one end with a high splitting ratio is used as the second port 22 of the optical coupler 2 and connected to the input end of the tunable optical attenuator 3.

[0049] For example, the optical coupler 2 is a 1x2 coupler, and the splitting ratio is 70 / 30. The second port 22 corresponds to a splitting ratio of 70%, and the third port 23 corresponds to a splitting ratio of 30%.

[0050] According to one embodiment of the present application, the multi-core fiber structure is formed by packaging two corresponding fibers in the same ceramic ferrule, or directly using a multi-core fiber for flange coupling. As shown in Figure 2 .

[0051] According to one embodiment of the present application, the working wavelength of the first wavelength division multiplexer 4 and the second wavelength division multiplexer 5 is 980 / 1550 nm.

[0052] According to one embodiment of the present application, the pump source 1 is a single-mode fiber-coupled semiconductor laser with a center wavelength of 980 nm. The mechanically shared first resonant cavity 6 and the second resonant cavity 7 use the same pump source 1, which can achieve a better common mode noise suppression ratio.

[0053] In conclusion, the high-repetition frequency double optical comb laser based on mechanical sharing of the embodiment of the application can obtain double optical comb output without crosstalk problem and with higher repetition frequency, which is beneficial to subsequent measurement application.

[0054] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0055] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0056] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0057] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A mechanically shared based high repetition rate, crosstalk-free dual comb fiber laser, characterized in that, The application relates to a high repetition rate mode-locked fiber laser device. The application relates to a high repetition rate mode-locked fiber laser device. The application relates to a high repetition rate mode-locked fiber laser device. The application relates to a high repetition rate mode-locked fiber laser device. The application relates to a high repetition rate mode-locked fiber laser device. The application relates to a high repetition rate mode-locked fiber laser device. The application relates to a high repetition rate mode-locked fiber laser device. The application relates to a high repetition rate mode-locked fiber laser device. The application relates to a high repetition rate mode-locked fiber laser device.

2. The mechanically shared based high repetition rate, no cross talk dual comb fiber laser of claim 1, wherein, The application relates to a high repetition rate mode-locked fiber laser device.

3. The mechanically shared based high repetition rate, no cross talk dual comb fiber laser of claim 1, wherein, The application relates to a high repetition rate mode-locked fiber laser device.

4. The mechanically shared high repetition rate, no cross talk dual comb fiber laser based on optical comb of claim 1, wherein, The application relates to a high repetition rate mode-locked fiber laser device.

5. The mechanically shared based high repetition rate, no cross talk dual comb fiber laser of claim 1, wherein, The application relates to a high repetition rate mode-locked fiber laser device.

6. The mechanically shared based high repetition rate, no cross talk dual comb fiber laser of claim 1, wherein, The application relates to a high repetition rate mode-locked fiber laser device.

7. The mechanically shared based high repetition rate, no cross talk dual comb fiber laser of claim 1, wherein, The application relates to a high repetition rate mode-locked fiber laser device.

8. The mechanically shared based high repetition rate, no cross talk dual comb fiber laser of claim 1, wherein, The application relates to a high repetition rate mode-locked fiber laser device. The application relates to a high repetition rate mode-locked fiber laser device. The application relates to a high repetition rate mode-locked fiber laser device. The application relates to a high repetition rate mode-locked fiber laser device. The application relates to a high repetition rate mode-locked fiber laser device. The application relates to a high repetition rate mode-locked fiber laser device. The application relates to a high repetition rate mode-locked fiber laser device. The application relates to a high repetition rate mode-locked fiber laser device. The application relates to a high repetition rate mode-locked fiber laser device. The application relates to a high repetition rate mode-locked fiber laser device. 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The application relates to a high repetition rate mode-locked fiber laser device. The application relates to a high repetition rate mode-locked fiber laser device. The application relates to a high repetition rate mode-locked fiber laser device. The application relates to a high repetition rate The common end of the second wavelength division multiplexer is fiber-coupled with the second doped optical fiber for coupling pump light into the second resonant cavity.

9. The mechanically shared high repetition rate, no cross talk dual comb fiber laser based on optical comb of claim 1, wherein, The optical coupler is a 1x2 coupler, and one end with high splitting ratio is used as the second port of the optical coupler and is connected with the input end of the tunable optical attenuator.

10. The mechanically shared based high repetition rate, no-crosstalk dual comb fiber laser of claim 1, wherein, The multi-core fiber-like structure is formed by encapsulating two corresponding optical fibers in the same ceramic ferrule, or directly using a multi-core fiber for flange coupling.

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