CN115513754A

CN115513754A - Isolator and laser

Info

Publication number: CN115513754A
Application number: CN202211160891.8A
Authority: CN
Inventors: 刘浪; 邱杭锴
Original assignee: Hangzhou Aochuang Photonics Technology Co ltd
Current assignee: Hangzhou Aochuang Photonics Technology Co ltd
Priority date: 2022-09-22
Filing date: 2022-09-22
Publication date: 2022-12-23

Abstract

The embodiment of the invention discloses an isolator and a laser, wherein the isolator comprises an amplifying module, a coupling module, an isolating module, a monitoring module and an output module which are integrally arranged; the amplifying module comprises a pumping source and an input collimator; the pump source emits pump light; the input collimator is connected with the active optical fiber and is used for transmitting first signal light emitted by the active optical fiber; the coupling module is positioned on a transmission path of the pump light and used for transmitting the pump light to the input collimator, and the input collimator outputs second signal light; the isolation module is positioned on a transmission path of the second signal light and comprises a light splitting unit, and the light splitting unit is used for splitting the second signal light into output light and monitoring light; the monitoring module is positioned on the transmission path of the monitoring light and used for monitoring the monitoring light; the output module is positioned on the transmission path of the output light and used for outputting the output light. Through the integrated setting with a plurality of modules, solve the many, with high costs scheduling problem of device quantity in the current laser instrument.

Description

Isolator and laser

Technical Field

The invention relates to the technical field of laser devices, in particular to an isolator and a laser.

Background

The optical isolator is a passive optical device which only allows unidirectional light to pass through, and the working principle of the optical isolator is based on the nonreciprocal property of Faraday rotation. The light reflected by the fiber echo can be well isolated by the optical isolator. The optical isolator mainly utilizes the faraday effect of the magneto-optical crystal. The characteristics of the optical isolator are: the forward insertion loss is low, the reverse isolation degree is high, and the return loss is high. The optical isolator is a passive device which allows light to pass through in one direction and prevents the light from passing through in the opposite direction, and the optical isolator has the function of limiting the direction of the light, so that the light can be transmitted in a single direction only, and the light reflected by the optical fiber echo can be well isolated by the optical isolator, so that the light wave transmission efficiency is improved. And to prevent adverse effects of backward propagating light in the optical path due to various causes on the light source and the optical path system.

The existing optical isolator is difficult to reduce in size and low in integration level, and with the increase of devices, the problems that the number of welding points is increased, the nonlinear effect is increased and the like can occur correspondingly.

Disclosure of Invention

The embodiment of the invention provides an isolator and a laser, and solves the problems of large number of devices, high cost and the like in the conventional laser by integrally arranging a plurality of modules.

In a first aspect, an embodiment of the present invention provides a laser, including: the device comprises an amplifying module, a coupling module, an isolating module, a monitoring module and an output module which are arranged in an integrated manner;

the amplification module comprises a pumping source and an input collimator; the pump source emits pump light; the input collimator is connected with the active optical fiber and is used for transmitting first signal light emitted by the active optical fiber;

the coupling module is located on a transmission path of the pump light and is used for transmitting the pump light to the input collimator, and the input collimator outputs second signal light;

the isolation module is located on a transmission path of the second signal light, and the isolation module comprises a light splitting unit, and the light splitting unit is used for splitting the second signal light into output light and monitoring light;

the monitoring module is positioned on a transmission path of the monitoring light and is used for monitoring the monitoring light;

the output module is located on a transmission path of the output light and used for outputting the output light.

Optionally, the isolation module further includes a polarization splitting prism, a half wave plate, and a faraday rotator;

the polarization beam splitter prism, the half-wave plate, the Faraday rotator and the beam splitting unit are all positioned on a transmission path of the second signal light, the second signal light sequentially passes through the polarization beam splitter prism, the half-wave plate, the Faraday rotator and the beam splitting unit, the light splitting unit splits the second signal light into the output light and the monitoring light, the output light is transmitted to the output module, and the monitoring light is transmitted to the monitoring module.

the light splitting unit is located on a transmission path of the second signal light and divides the second signal light into the output light and the monitoring light, the half wave plate, the Faraday rotator and the polarization beam splitter prism are located on the transmission path of the output light, the output light sequentially passes through the half wave plate, the Faraday rotator and the polarization beam splitter prism and then is transmitted to the output module, and the monitoring light is transmitted to the monitoring module.

Optionally, the light splitting unit includes a birefringent crystal or a polarization splitting prism.

Optionally, the coupling module includes a 0 ° wave plate and a dimming unit;

the 0-degree wave plate is positioned on a transmission path of the pump light;

the light adjusting unit comprises a first light transmission path and a second light transmission path, and the first light transmission path is used for reflecting the pump light to the input collimator; the second light transmission path is used for transmitting the second signal light to the isolation module.

Optionally, the dimming unit comprises a 45 ° wave plate;

the pump light is transmitted to the 45-degree wave plate to be reflected to the input collimator, and the second signal light is transmitted to the 45-degree wave plate to be transmitted to the isolation module;

or, the light adjusting unit comprises a polarization splitting prism;

the pump light is transmitted to the polarization beam splitter prism to be reflected to the input collimator, and the second signal light is transmitted to the polarization beam splitter prism to be transmitted to the isolation module;

alternatively, the dimming cell comprises a birefringent crystal;

the pump light is transmitted to the first end of the birefringent crystal and is reflected to the input collimator through the second end of the birefringent crystal, and the second signal light is transmitted to the second end of the birefringent crystal and is transmitted to the isolation module through the third end of the birefringent crystal.

Optionally, the amplifying module further includes a first collimator, and the output module includes a second collimator;

the first collimator is located on a transmission path of the pump light, and the second collimator is located on a transmission path of the output light.

Optionally, the monitoring module includes a photodetector;

the photoelectric detector is positioned on the transmission path of the monitoring light and used for monitoring the performance parameters of the monitoring light.

Optionally, the monitoring module further comprises at least one mirror;

the reflector is located on a transmission path of the monitoring light and used for transmitting the monitoring light to the photoelectric detector.

In a second aspect, an embodiment of the present invention provides a laser including the isolator described in any one of the first aspects.

The isolator provided by the embodiment of the invention comprises an amplifying module, a coupling module, an isolating module, a monitoring module and an output module which are integrated, wherein the amplifying module comprises a pumping source and an input collimator; the pump source emits pump light; the input collimator is connected with the active optical fiber and is used for transmitting first signal light emitted by the active optical fiber; the coupling module is located on a transmission path of the pump light and is used for transmitting the pump light to the input collimator to realize amplification of the first signal light, namely, the input collimator outputs the second signal light. The isolation module is positioned on a transmission path of the second signal light and comprises a light splitting unit, and the light splitting unit is used for splitting the second signal light into output light and monitoring light; the monitoring module is positioned on the transmission path of the monitoring light and used for monitoring the monitoring light; the output module is positioned on the transmission path of the output light and used for outputting the output light. The integrated setting of a plurality of modules is realized, the functions of the isolator are enriched, the problems of large number of devices, high cost and the like in the isolator in the prior art are solved, and the isolator with high integration requirement is met.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an isolator according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of another isolator provided by an embodiment of the invention;

FIG. 3 is a schematic structural diagram of another isolator provided by an embodiment of the invention;

FIG. 4 is a schematic structural diagram of another isolator provided by an embodiment of the invention;

FIG. 5 is a schematic structural diagram of another isolator provided by an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a laser according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be fully described by the detailed description with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, not all embodiments, and all other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without inventive efforts fall within the scope of the present invention.

Fig. 1 is a schematic structural diagram of an isolator according to an embodiment of the present invention, and referring to fig. 1, an isolator 10 according to an embodiment of the present invention includes an amplifying module 100, a coupling module 200, an isolating module 300, a monitoring module 500, and an output module 400, which are integrally disposed; the amplification module 100 includes a pump source 110 and an input collimator 120; the pump source 110 emits pump light; the input collimator 120 is connected to the active fiber 20, and is configured to transmit the first signal light emitted from the active fiber 20; the coupling module 200 is located on a transmission path of the pump light, and is configured to transmit the pump light to the input collimator 120, where the input collimator 120 outputs a second signal light; the isolation module 300 is located on a transmission path of the second signal light, the isolation module 300 includes an optical splitting unit 310, and the optical splitting unit 310 is configured to split the second signal light into output light and monitoring light; the monitoring module 500 is located on a transmission path of the monitoring light, and is used for monitoring the monitoring light; the output module 400 is located on a transmission path of the output light for outputting the output light.

The isolator 10 is an optical fiber isolator, and the isolator 10 is inserted between the laser and the optical fiber, so that reflected light generated from the far-end face of the optical fiber, the interface of the optical fiber connector and the like in a circuit can be effectively inhibited from returning to the laser, the working state of the laser is ensured to be stable, and noise of a system caused by the reflected light is reduced. That is, the light source and the optical path system are prevented from being adversely affected by backward propagating light generated for various reasons in the optical path.

Specifically, the isolator 10 provided in the embodiment of the present invention includes the amplifying module 100, the coupling module 200, the isolating module 300, the monitoring module 500, and the output module 400, which are integrally disposed, so that high integration of the isolator 10 is realized, and the isolation function of the isolator 10 and the stable effect of light transmission are ensured. Referring to fig. 1, the amplifying module 100 and the coupling module 200 are configured to amplify power of the first signal light emitted from the active optical fiber 20 and transmit the amplified second signal light. Specifically, the amplifying module 100 includes a pump source 110 and an input collimator 120, where the pump source 110 is used to emit pump light, and the input collimator 120 is connected to the active fiber 20 and is used to collimate the first signal light emitted from the active fiber 20. The pump light emitted from the pump source 110 is coupled to the input collimator 120 through the coupling module 200, so that the first signal light is coupled and amplified for multiple times, and the input collimator 120 can output the amplified second signal light, wherein the power of the second signal light is greater than that of the first signal light.

Further, the isolation module 300 is configured to transmit the second signal light, and ensure that interference caused by other factors on the second signal light is prevented, and ensure a light transmission effect of the isolator 10. Specifically, the isolation module 300 further includes a light splitting unit 310, where the light splitting unit 310 splits the second signal light into an output light and a monitoring light at different angles, and the output light is a required light and can be output through the output module 400. The monitoring light is the light under the non-demand, can monitor the monitoring light through monitoring module 500, realizes the feedback to isolator 10, guarantees that isolator 10 outputs stable required light.

Illustratively, referring to fig. 1, the working process of the isolator 10 provided by the embodiment of the present invention is as follows: the pump light emitted from the pump source 110 is transmitted to the coupling module 200, and the coupling module 200 is used for adjusting the pump light and transmitting the pump light to the input collimator 120. And the input collimator 120 is connected to the active fiber 20, and the input collimator 120 receives the first signal light emitted from the active fiber 20 and amplifies the power of the first signal light in combination with the absorbed pump light. Further, the arrangement of the coupling module 200 may implement multiple amplification of the first signal light at the input collimator 120, and the embodiment of the present invention does not specifically limit the transmission times of the amplified first signal light between the input collimator 120 and the coupling module 200. The input collimator 120 outputs the amplified first signal light, that is, the second signal light, which is transmitted to the isolation module 300 through the coupling module 200. The isolation module 300 includes a light splitting unit 310, the light splitting unit 310 splits the second signal light at different angles, the light meeting the requirement, i.e., the output light, is output through the output module 400, and the light not meeting the requirement, i.e., the monitoring light, realizes the feedback to the isolator 10 through the monitoring module 500. By integrally arranging a plurality of different modules in the isolator 10, the function of the isolator 10 is enriched, and meanwhile, the isolator 10 with high integration requirement is also met, the cost of the isolator 10 is reduced, the condition of excessive welding points is avoided, and the problem of increased nonlinear effect is solved.

In summary, in the isolator provided by the embodiment of the present invention, the amplifying module includes a pump source and an input collimator; the pump source emits pump light; the input collimator is connected with the active optical fiber and is used for transmitting first signal light emitted by the active optical fiber; the coupling module is located on a transmission path of the pump light and is used for transmitting the pump light to the input collimator to realize amplification of the first signal light, namely, the input collimator outputs the second signal light. The isolation module is positioned on a transmission path of the second signal light and comprises a light splitting unit, and the light splitting unit is used for splitting the second signal light into output light and monitoring light; the monitoring module is positioned on the transmission path of the monitoring light and used for monitoring the monitoring light; the output module is positioned on the transmission path of the output light and used for outputting the output light. The integrated setting of a plurality of modules is realized, the functions of the isolator are enriched, the problems of large number of devices, high cost and the like in the isolator in the prior art are solved, and the isolator with high integration requirement is met.

With continued reference to fig. 1, the isolation module 300 further includes a polarization splitting prism 320, a half-wave plate 330, and a faraday rotator 340; the polarization beam splitter prism 320, the half-wave plate 330, the faraday rotator 340 and the beam splitting unit 310 are all located on a transmission path of the second signal light, the second signal light sequentially passes through the polarization beam splitter prism 320, the half-wave plate 330, the faraday rotator 340 and the beam splitting unit, the 310 beam splitting unit 310 splits the second signal light into output light and monitoring light, the output light is transmitted to the output module 400, and the monitoring light is transmitted to the monitoring module 5003.

The isolation module 300 includes a polarization splitting prism 320, a half-wave plate 330, a faraday rotator 340, and a splitting unit 310, wherein the polarization splitting prism 320, the half-wave plate 330, and the faraday rotator 340 realize isolation of the isolation module 300 from the second signal light, so as to prevent the second signal light from being interfered and ensure stability of light transmission by the isolator 10. The required output light and the non-required monitoring light are separated from the second signal light through the light splitting unit 310, the required output light is obtained by the isolator 10, the feedback and the detection of the isolator 10 are realized, the function enrichment of the isolator 10 is realized, and based on the light splitting effect of the light splitting unit 310, the integration arrangement of the isolation module 300, the monitoring module 500 and the output module 400 is further realized, and the high integration of the isolator 10 is embodied.

Illustratively, referring to fig. 1, an operation process of the isolator 10 according to the embodiment of the present invention is as follows: the pump light emitted from the pump source 110 is transmitted to the coupling module 200, the exemplary pump source 110 emits pump light of 980nm, and the coupling module 200 is used to condition the pump light and transmit the pump light to the input collimator 120. And the input collimator 120 is connected to the active fiber 20, and the input collimator 120 receives the first signal light emitted from the active fiber 20 and amplifies the power of the first signal light in combination with the absorbed pump light. The input collimator 120 outputs the amplified first signal light, that is, the second signal light, which is transmitted to the isolation module 300 through the coupling module 200. The isolation module 300 comprises a light splitting unit 310, the light splitting unit 310 splits the second signal light at different angles, the light meeting the requirements, namely the output light, is output through the output module 400, the light not meeting the requirements, namely the monitoring light, passes through the monitoring module 500, the optical performance parameters of the light are detected, and the feedback to the isolator 10 is realized. And the second signal light in the isolation module 300 passes through the half-wave plate 330, the faraday rotator 340 and the polarization splitting prism 320 among the light splitting units 310, so as to achieve isolation of the second signal light. Further, if there is a light reflected back to the isolator 10 through the output module 400, the light passes through the light splitting unit 310, the faraday rotator 340, the half-wave plate 330 and the polarization splitting prism 320 in sequence, and the light is split into two parts when passing through the light splitting unit 310 according to the difference of polarization states, wherein one light is refracted when passing through the light splitting unit 310, deviates from a reflection path, and filters the light, and the other light passes through the light splitting unit 310, and then the polarization state of the other light is changed when passing through the faraday rotator 340 and the half-wave plate 330, so that the other light is refracted when passing through the polarization splitting prism 320, that is, the reflected light is filtered out of the isolator 10, thereby ensuring the stability of the isolator 10. By integrally arranging a plurality of different modules in the isolator 10, the function of the isolator 10 is enriched, and meanwhile, the isolator 10 with high integration requirement is also met, the cost of the isolator 10 is reduced, the condition of excessive welding points is avoided, and the problem of increased nonlinear effect is solved.

Fig. 2 is a schematic structural diagram of another isolator according to an embodiment of the present invention, and referring to fig. 2, the isolation module 300 further includes a polarization splitting prism 320, a half-wave plate 330, and a faraday rotator 340; the light splitting unit 310 is located on a transmission path of the second signal light, and splits the second signal light into an output light and a monitoring light, the half-wave plate 330, the faraday rotator 340, and the polarization beam splitter prism 320 are located on the transmission path of the output light, the output light passes through the half-wave plate 330, the faraday rotator 340, and the polarization beam splitter prism 320 in sequence, and then is transmitted to the output module 400, and the monitoring light is transmitted to the monitoring module 500.

The polarization beam splitter prism 320, the half-wave plate 330 and the faraday rotator 340 included in the isolation module 300 isolate the transmitted light, thereby avoiding being affected by other factors and ensuring the stability of the light transmission of the isolator 10. The light splitting unit 310 in the isolation module 300 separates the required output light and the non-required monitoring light from the second signal light, so that the isolator 10 obtains the required output light, and the feedback and detection of the isolator 10 realize the enrichment of the functions of the isolator 10.

Further, referring to fig. 2, the second signal light transmitted in the isolation module 300 first passes through the light splitting unit 310, that is, the second signal light is directly split into the desired output light and the undesired monitoring light. The required output light sequentially passes through the half-wave plate 330, the faraday rotator 340 and the polarization beam splitter prism 320, so that the output light is isolated, and the stability of light transmission of the isolator 10 is ensured. Illustratively, referring to fig. 2, the working process of the isolator 10 provided by the embodiment of the present invention is as follows: the pump light emitted from the pump source 110 is transmitted to the coupling module 200, and the coupling module 200 is used for adjusting the pump light and transmitting the pump light to the input collimator 120. And the input collimator 120 is connected to the active fiber 20, and the input collimator 120 receives the first signal light emitted from the active fiber 20 and amplifies the power of the first signal light in combination with the absorbed pump light. The input collimator 120 outputs the amplified first signal light, that is, the second signal light, which is transmitted to the isolation module 300 through the coupling module 200. The isolation module 300 includes a light splitting unit 310, the light splitting unit 310 splits the second signal light at different angles, the light meeting the requirement, i.e., the output light, is output through the output module 400, and the light not meeting the requirement, i.e., the monitoring light, realizes the feedback to the isolator 10 through the monitoring module 500. And the output light passes through the half-wave plate 330, the faraday rotator 340 and the polarization splitting prism 320, so that the output light is isolated. By integrally arranging a plurality of different modules in the isolator 10, the functions of the isolator 10 are enriched, and meanwhile, the isolator 10 with high integration requirement is also met, the cost of the isolator 10 is reduced, the condition of excessive welding points is avoided, and the problem of increase of nonlinear effect is solved.

Fig. 3 is a schematic structural diagram of another isolator according to an embodiment of the present invention, and referring to fig. 1 to fig. 3, the light splitting unit 310 includes a birefringent crystal 310a or a polarization splitting prism 310b.

The light splitting unit 310 mainly performs light splitting processing on input light at different angles, splits the required output light and monitoring light to be monitored, and performs different functions of outputting and monitoring the isolator 10 based on the split light. Illustratively, the light splitting unit 310 may be a birefringent crystal or a polarization splitting prism. When one light wave is projected onto a crystal interface, two refracted light beams are generally generated, and this phenomenon is called birefringence. Due to the anisotropy of the crystal material, the size of the included angle between the two refracted light beams is related to the propagation direction and the polarization state of the light wave. The crystal generating the birefringence phenomenon is called a birefringent crystal, and the birefringent crystal may be, for example, an yttrium vanadate crystal, which is not specifically limited in this embodiment of the present invention. Specifically, referring to fig. 1 and 2, the light splitting unit 310 is a birefringent crystal 310a, and referring to fig. 3, the light splitting unit 310 is a polarization splitting prism 310b, and thus, the arrangement of the isolator 10 provided by the embodiment of the present invention is diversified.

Fig. 4 is a schematic structural diagram of another isolator according to an embodiment of the present invention, and referring to fig. 1 to 4, a coupling module 200 includes a 0 ° wave plate 210 and a dimming unit 220; the 0 ° wave plate 210 is located on the transmission path of the pump light; the dimming unit 220 includes a first light transmission path 220a and a second light transmission path 220b, the first light transmission path 220a being used to reflect the pump light to the input collimator 120; the second light transmission path 220b is used for transmitting the second signal light to the isolation module 300.

The coupling module 200 includes a light modulating unit 220, and specifically, the light modulating unit 220 includes a first light transmission path 220a and a second light transmission path 220b, where the first light transmission path 220a transmits the pump light, that is, the pump light is transmitted to the input collimator 120. The second light transmission path 220b transmits the second signal light, and transmits the second signal light into the isolation module 300. For example, referring to fig. 1 to 4, the first light transmission path 220a and the second light transmission path 220b are interfaces or devices for the dimming unit 220 to adjust the light transmission direction, which is not specifically limited in the embodiment of the present invention.

Further, the coupling module 200 further includes a 0 ° wave plate, and the 0 ° wave plate 210 is located on a transmission path of the pump light, and can play a role of filtering light, that is, the signal light output by the input collimator 120 is further prevented from being transmitted to the pump source on the basis of the dimming unit 220, so as to avoid damage to other devices, that is, the safety and stability of the isolator 10 are improved.

Fig. 5 is a schematic structural diagram of another isolator according to an embodiment of the present invention, and referring to fig. 1 to 5, a dimming unit 220 includes a 45 ° wave plate 221; the pump light is transmitted to the 45 ° wave plate 221 and reflected to the input collimator 120, and the second signal light is transmitted to the 45 ° wave plate 221 and transmitted to the isolation module 300; alternatively, the dimming unit 220 includes a polarization splitting prism 223; the pump light is transmitted to the polarization beam splitter prism 223 to be reflected to the input collimator 120, and the second signal light is transmitted to the polarization beam splitter prism 223 to be transmitted to the isolation module 300; alternatively, the dimming cell 220 includes a birefringent crystal 222; the pump light is transmitted to the first end a of the birefringent crystal 222 and is reflected to the input collimator 120 through the second end b of the birefringent crystal 222, and the second signal light is transmitted to the second end b of the birefringent crystal 222 and is transmitted to the isolation module 300 through the third end c of the birefringent crystal 222.

The dimming unit 220 mainly adjusts the transmission paths of the pump light and the second signal light, so as to ensure that different light beams are transmitted to the correct transmission path, and ensure the normal operation of the isolator 10. Illustratively, the dimming cell 220 includes a 45 ° wave plate 221, a birefringent crystal 222, or a polarization splitting prism 223, which can achieve adjustment of transmission paths of two light rays.

Illustratively, referring to fig. 1 and 2, the dimming cell 220 is a 45 ° wave plate 221, and the pump light can be reflected and reflected to the input collimator 120, i.e., the reflection surface of the 45 ° wave plate 221, i.e., the first light transmission path 220a in the dimming cell 220, based on the arrangement position of the 45 ° wave plate 221 as shown in fig. 1 and 2. Meanwhile, the second signal light may be reflected and transmitted to the isolation module 300, i.e., the transmission surface of the 45 ° wave plate 221, i.e., the second light transmission path 220b in the dimming unit 220. Referring to fig. 3 and 5, the dimming unit 220 is a birefringent crystal 222, and the birefringent crystal 222 can provide two transmission paths of different light beams to achieve stable transmission of the second signal light and the pump light, that is, the transmission path for transmitting the pump light is a first light transmission path 220a, and the transmission path for transmitting the second signal light is a second light transmission path 220b. Referring to fig. 4, the light adjusting unit 220 may be a polarization splitting prism 223, and also may realize stable transmission of the second signal light and the pump light, that is, a reflection surface of the polarization splitting prism 223, that is, the first light transmission path 220a in the light adjusting unit 220. Meanwhile, the transmission surface of the polarization splitting prism 223 is the second light transmission path 220b in the dimming cell 220.

Illustratively, referring to fig. 3, the working process of the isolator 10 provided by the embodiment of the present invention is as follows: the pump light emitted from the pump source 110 is transmitted to the coupling module 200, and the dimming unit 220 in the coupling module 200 is used for adjusting the pump light and transmitting the pump light to the input collimator 120. And the input collimator 120 is connected to the active fiber 20, and the input collimator 120 receives the first signal light emitted from the active fiber 20 and amplifies the power of the first signal light in combination with the absorbed pump light. The input collimator 120 outputs the amplified first signal light, that is, the second signal light is transmitted to the isolation module 300 through the dimming module 220. In the isolation module 300, the second signal light passes through the half-wave plate 330, the faraday rotator 340, and the polarization splitting prism 320 in sequence, so as to implement isolation of the output light. Meanwhile, the polarization splitting prism 320 multiplexes the light splitting unit 310 to split the second signal light at different angles, light which meets the requirements under the condition of reducing the space of the isolator 10, that is, output light, is output through the output module 400, and light which does not meet the requirements, that is, monitoring light, is fed back to the isolator 10 through the monitoring module 500.

Illustratively, referring to fig. 4, the working process of the isolator 10 provided by the embodiment of the present invention is as follows: the pump light emitted from the pump source 110 is transmitted to the coupling module 200, and the dimming unit 220 in the coupling module 200 is used for adjusting the pump light and transmitting the pump light to the input collimator 120. And the input collimator 120 is connected to the active fiber 20, and the input collimator 120 receives the first signal light emitted from the active fiber 20 and amplifies the power of the first signal light in combination with the absorbed pump light. The input collimator 120 outputs the amplified first signal light, that is, the second signal light is transmitted to the isolation module 300 through the dimming module 220. The second signal light passes through the half-wave plate 330, the faraday rotator 340, and the light splitting unit 310 in sequence in the isolation module 300, wherein the light splitting unit 310 is a birefringent crystal 310a. The second signal light is split at different angles by the light splitting unit 310, the light satisfying the requirement, that is, the output light, is output through the output module 400, and the light not satisfying the requirement, that is, the monitoring light, is fed back to the isolator 10 through the monitoring module 500.

Illustratively, referring to fig. 5, the operation of the isolator 10 according to the embodiment of the present invention is similar to that of fig. 4, but a different dimming unit 220 is used in the coupling module 200. I.e., to suggest the versatility and universality of the isolator 10.

With continued reference to fig. 1-5, the amplification module 100 further includes a first collimator 130, and the output module 400 includes a second collimator 410; the first collimator 130 is positioned on a transmission path of the pump light, and the second collimator 410 is positioned on a transmission path of the output light.

The isolator 10 further includes a first collimator 130 and a second collimator 410, where the first collimator 130 and the second collimator 410 respectively realize collimation of the pump light and the output light, and ensure the working efficiency of the isolator 10. Further, the first collimator 130 and the second collimator 410 may also be polarization-maintaining fiber collimators, which is not specifically limited in this embodiment of the present invention.

With continued reference to fig. 1-5, the monitoring module 500 includes a photodetector 510; the photodetector 510 is positioned in the transmission path of the monitoring light for monitoring a performance parameter of the light.

Wherein, isolator 10 still includes Photoelectric Detector 510, and wherein Photoelectric Detector (PD) Photoelectric Detector can convert light signal into the signal of telecommunication, realizes and then monitoring and judging the light of transmission, and then realizes the feedback to isolator 10 transmission light, guarantees isolator 10's job stabilization nature.

Optionally, the monitoring module 500 further comprises at least one mirror 520; the mirror 520 is located on a transmission path of the monitoring light for transmitting the monitoring light to the photodetector 510.

Referring to fig. 1, 2, 4 and 5, the monitoring module 500 further includes at least one mirror 520, and the mirror 520 is arranged to flexibly set the position of the photodetector 510 of the monitoring module 500, that is, the mirror 520 may be used to adaptively adjust the actual setting mode of the isolator 10. Only one mirror 520 is illustrated in the figure, which is not particularly limited in the embodiment of the present invention.

Further, in order to ensure the flexible arrangement of the isolator 10, a mirror 230 may be added to the coupling module 200, which is shown in fig. 3 and 5, and the number of the mirrors is not limited in this embodiment of the present invention.

Based on the same concept, an embodiment of the present invention further provides a laser, fig. 6 is a schematic structural diagram of the laser provided in the embodiment of the present invention, and as shown in fig. 6, the laser 1 includes the isolator 10 described in any of the above embodiments, so that the laser 1 provided in the embodiment of the present invention has the corresponding beneficial effects in the above embodiments, and details are not repeated here.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An isolator, comprising: the device comprises an amplifying module, a coupling module, an isolating module, a monitoring module and an output module which are arranged in an integrated manner;

the amplifying module comprises a pumping source and an input collimator; the pump source emits pump light; the input collimator is connected with an active optical fiber and is used for transmitting first signal light emitted by the active optical fiber;

the output module is positioned on the transmission path of the output light and used for outputting the output light.

2. The isolator of claim 1, wherein the isolation module further comprises a polarization splitting prism, a half wave plate, and a faraday rotator;

the polarization beam splitter prism, the half wave plate, the Faraday rotator and the beam splitting unit are all located on a transmission path of the second signal light, the second signal light sequentially passes through the polarization beam splitter prism, the half wave plate, the Faraday rotator and the beam splitting unit, the beam splitting unit divides the second signal light into the output light and the monitoring light, the output light is transmitted to the output module, and the monitoring light is transmitted to the monitoring module.

3. The isolator according to claim 1, wherein the isolation module further comprises a polarization splitting prism, a half wave plate and a faraday rotator;

4. A spacer as claimed in claim 2 or 3 wherein the beam splitting cell comprises a birefringent crystal or a polarizing beam splitting prism.

5. The isolator of claim 1, wherein the coupling module comprises a 0 ° wave plate and a dimming cell;

the 0-degree wave plate is positioned on a transmission path of the pump light;

the dimming unit comprises a first light transmission path and a second light transmission path, and the first light transmission path is used for reflecting the pump light to the input collimator; the second light transmission path is used for transmitting the second signal light to the isolation module.

6. The isolator as claimed in claim 5, wherein the dimming cell comprises a 45 ° wave plate;

or, the light adjusting unit comprises a polarization splitting prism;

alternatively, the dimming cell comprises a birefringent crystal;

7. An isolator as claimed in claim 1, wherein the amplification module further comprises a first collimator and the output module comprises a second collimator;

8. An isolator as claimed in claim 1, wherein the monitoring module comprises a photodetector;

9. An isolator as claimed in claim 8, wherein the monitoring module further comprises at least one mirror;

10. A laser comprising the isolator as claimed in any one of claims 1 to 9.