CN117439661A - Light reversing light reflector, light relay device and fiber laser - Google Patents

Abstract

The embodiment of the application provides an optical reverse reflector, an optical relay device and an optical fiber laser, and relates to the technical fields of optical fiber laser and optical communication. An optical transmitter, an optical lens, a filter, and an optical reflector arranged in this order; an optical transmitter for receiving and transmitting an incident laser light or a target laser light; the optical lens is used for carrying out beam expansion and collimation treatment on incident laser to obtain collimated laser and transmitting the collimated laser to the filter; a filter for reflecting the amplified spontaneous emission noise in the collimated laser and the target laser to different positions and emitting the target laser to the light reflector; and a light reflector for reflecting the target laser light to the light transmitter. The target laser in the collimated laser can be reflected back to the optical transmitter through the filter, and the amplified spontaneous emission noise in the collimated laser is reflected to other positions, so that the amplified spontaneous emission noise in the collimated laser can be accurately and completely filtered.

Description

Optical retroreflector, optical relay device and fiber laser

Technical field

The present application relates to the technical fields of fiber lasers and optical communications. Specifically, it relates to an optical retroreflector, an optical relay device and a fiber laser.

Background technique

Fiber lasers or optical repeaters generally contain multi-stage fiber amplifiers. Each stage of fiber amplifiers amplifies the incident laser power step by step and collaboratively increases it to the target level. Usually, in the process of optical amplification of laser light by optical fiber amplifiers at all levels in active optical fibers, amplifier spontaneous emission noise (ASE) will be generated. In order to avoid damage to the fiber laser caused by ASE being transmitted to the next-level fiber amplifier, the ASE in the optically amplified laser needs to be blocked in each level of fiber amplifier.

In the existing technology, in order to filter out the ASE in the laser emitted by the previous stage fiber amplifier and the ASE generated by the current stage fiber amplifier, an optical isolator is generally provided in each stage of the fiber amplifier.

However, even if an optical isolator is used, the output laser still contains strong ASE due to the structural deficiencies of the optical isolator.

Contents of the invention

The purpose of this application includes providing an optical retroreflector, an optical relay device and a fiber laser, which can reflect the target laser in the collimated laser back to the optical transmitter through the filter, and at the same time reflect the target laser in the collimated laser. The amplified spontaneous emission noise is reflected to other locations, achieving accurate and complete filtering of the amplified spontaneous emission noise in the collimated laser.

The embodiment of this application can be implemented as follows:

In a first aspect, the present application provides a light retroreflector, including: an optical transmitter, an optical lens, a filter, and a light reflector arranged in sequence, and the optical lens is disposed on the incident laser of the optical transmitter. ejection end;

The optical transmitter is configured to receive and transmit the incident laser or target laser;

The optical lens is configured to perform shaping processing on the incident laser to obtain collimated laser and emit it to the filter;

The filter is configured to reflect amplified spontaneous emission noise in the collimated laser to the optical transmitter and transmit the target laser to the optical reflector, or is configured to reflect the target laser to the optical transmitter, and transmit the amplified spontaneous emission noise in the collimated laser to the optical reflector;

The light reflector is configured to reflect amplified spontaneous emission noise in the target laser or the collimated laser to the optical transmitter.

In an optional implementation, the filter is set at a first preset angle with respect to the direction of the vertical optical axis or the light reflector is set with a second preset angle with respect to the direction of the vertical optical axis. The device reflects the amplified spontaneous emission noise in the collimated laser to the optical transmitter, and transmits the target laser to the optical reflector, and the optical reflector reflects the target laser to the optical transmitter. A different location from the amplified spontaneous emission noise in the collimated laser.

In an optional implementation, the optical transmitter includes: the filter is set at a third preset angle relative to the direction of the vertical optical axis or the light reflector is set at a fourth preset angle relative to the direction of the vertical optical axis. At a preset angle, the filter reflects the target laser to the optical transmitter, and transmits the amplified spontaneous emission noise in the collimated laser to the optical reflector, and the optical reflector reflects the collimated laser. Amplified spontaneous emission noise in the laser to a different location in the optical transmitter than the target laser.

In an optional implementation, the optical transmitter includes: a first optical core and a second optical core;

The first optical core is used to transmit incident laser light or target laser light;

The second optical core is used to receive and transmit the amplified spontaneous emission noise reflected by the filter or the light reflector.

In an optional implementation, the directions of the tail end surfaces of the first optical core and the second optical core relative to the vertical optical axis are both set at a fifth preset angle.

In an optional implementation, the optical transmitter includes: an incident optical core;

The incident light core is used to transmit incident laser light or target laser light.

In an optional implementation, the direction of the tail end surface of the incident light core relative to the vertical optical axis is set at a sixth preset angle.

In an optional implementation, the light retroreflector further includes: a light dumper;

The light dumper is used to receive and store the amplified spontaneous emission noise reflected by the filter or the light reflector.

In an optional implementation, the direction of the end surface of the optical lens close to the optical transmitter relative to the vertical optical axis is set at a seventh preset angle.

In a second aspect, the present application provides an optical relay device, including: a multi-stage fiber amplifier; each stage of the optical fiber amplifier includes: an optical retroreflector, an amplifier gain fiber and an optical fiber according to any one of the first aspects. Router, the first port of the optical router is used to receive the initial laser, the second port of the optical router is connected to the first end of the amplifier gain fiber, and the third port of the optical router is used to emit the outgoing laser, The second end of the amplifier gain fiber is connected to the first end of the light retroreflector.

In a third aspect, the application provides a fiber laser. The fiber laser includes: a multi-stage fiber amplifier; each stage of the fiber amplifier includes: a light retroreflector and a laser gain fiber according to any one of the first aspects. and an optical router, the first port of the optical router is used to receive the initial laser, the second port of the optical router is connected to the first end of the laser gain fiber, and the third port of the optical router is used to emit outgoing light. Laser, the second end of the laser gain fiber is connected to the light retroreflector.

The beneficial effects of the embodiments of this application include:

Using the optical retroreflector, optical relay device and fiber laser provided by this application, the filter can reflect the effective target laser in the collimated laser back to the optical transmitter, and at the same time guide the ASE in the collimated laser to the Different positions of the target laser are used to re-send the target laser into the optical transmitter with minimal loss, blocking damage to other devices caused by ASE.

Description of the drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application and therefore do not It should be regarded as a limitation of the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic structural diagram of a light retroreflector provided by an embodiment of the present application;

Figure 2 is a schematic structural diagram of a light retroreflector provided by an embodiment of the present application;

Figure 3 is a schematic structural diagram of a light retroreflector provided by an embodiment of the present application;

Figure 4 is a schematic diagram of the filter and angle settings of the light retroreflector provided by the embodiment of the present application;

Figure 5 is a schematic diagram of the filter and light reflector of the light retroreflector provided by the embodiment of the present application at another angle;

Figure 6 is a schematic diagram of the filter and light reflector of the light retroreflector provided by the embodiment of the present application at another angle;

Figure 7 is a schematic diagram of the filter and light reflector of the light retroreflector provided by the embodiment of the present application at another angle;

Figure 8 is a schematic structural diagram of a light retroreflector provided by an embodiment of the present application including a first optical core and a second optical core;

Figure 9 is another structural schematic diagram of a light retroreflector provided by an embodiment of the present application including a first optical core and a second optical core;

Figure 10 is a side view of another structure of the optical transmitter of the optical retroreflector provided by the embodiment of the present application;

Figure 11 is a side view of the structure of a light retroreflector including an incident light core provided by an embodiment of the present application;

Figure 12 is a schematic structural diagram of an optical retroreflector including an optical dumper provided by an embodiment of the present application;

Figure 13 is another structural schematic diagram of an optical retroreflector including an optical dumper provided by an embodiment of the present application;

Figure 14 is a schematic structural diagram of an optical relay device provided by an embodiment of the present application;

Figure 15 is a schematic structural diagram of a light retroreflector provided by an embodiment of the present application.

Icon: 101-optical transmitter; 101a-first optical core; 101b-second optical core; 101c-first end cap; 101d-incident optical core; 101e-second end cap; 101f-optical dumper; 102 -Optical lens; 103-filter; 1031-bandpass filter; 1032-band inverse filter; 104-optical reflector; 201-first-stage optical fiber amplifier; 2011-first-stage optical router; 2012-first stage Amplifier gain fiber; 2013-first-stage optical retroreflector; 202-second-stage optical fiber amplifier; 2021-second-stage optical router; 2022-second-stage amplifier gain fiber; 2023-second-stage optical retroreflector ; 203-Nth level optical fiber amplifier; 2031-Nth level optical router; 2032-Nth level amplifier gain fiber; 2033-Nth level optical retroreflector; 301-The first optical fiber amplifier; 3011-The first optical router ;3012-First laser gain fiber; 3013-First optical retroreflector; 302-Second optical fiber amplifier; 3021-Second optical router; 3022-Second laser gain fiber; 3023-Second optical retroreflector ; 303-Nth optical fiber amplifier; 3031-Nth optical router; 3032-Nth laser gain fiber; 3033-Nth optical retroreflector.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments These are part of the embodiments of this application, but not all of them. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the application provided in the appended drawings is not intended to limit the scope of the claimed application, but rather to represent selected embodiments of the application. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.

It should be noted that similar reference numerals and letters represent similar items in the following figures, therefore, once an item is defined in one figure, it does not need further definition and explanation in subsequent figures.

In the description of this application, it should be noted that if the terms "upper", "lower", "inner", "outer", etc. appear to indicate an orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, or It is the orientation or positional relationship in which the invention product is usually placed when in use. It is only for the convenience of describing the present application and simplifying the description. It does not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. , therefore cannot be understood as a limitation on this application.

In addition, if the terms "first", "second", etc. appear, they are only used to differentiate the description and shall not be understood as indicating or implying relative importance.

It should be noted that, as long as there is no conflict, the features in the embodiments of the present application can be combined with each other.

Optical retroreflector, also known as optical fiber light reflector, consists of an optical fiber ferrule with a protective cap at one end. It can be used in various all-fiber devices, such as optical measurement systems, fiber interferometers, retroreflectors, Fiber amplifier, etc. The optical retroreflector can reflect back lasers of a certain fixed wavelength among the received lasers, while lasers of other wavelengths can pass through normally.

In the existing technology, optical retroreflectors used in fiber amplifiers can only selectively select light of one or a few preset wavelengths. Since ASE has a wide frequency band and can occupy the entire gain bandwidth, the existing technology The optical retroreflector cannot reflect ASE with a wide frequency band, which may cause high-intensity ASE to damage the components of the upper or lower level fiber amplifier.

Based on this, after research, the applicant proposed an optical retroreflector, optical relay device and fiber laser, which can reflect the target laser back to the optical transmitter through a filter (Band Pass Filter, referred to as BPF), and ASE and other light that is not at the target laser wavelength are guided to a different position from the target laser, achieving filtering of ASE with minimal loss and avoiding damage to other devices caused by high-intensity ASE.

The optical retroreflector, optical relay device and fiber laser provided in the embodiments of the present application will be explained below with reference to multiple specific application examples.

Figure 1 shows a schematic structural diagram of a light retroreflector provided by an embodiment of the present application. The light retroreflector includes: an optical transmitter 101, an optical lens 102, a filter 103 and a light reflector 104 arranged in sequence. The optical lens 102 is disposed at the incident laser output end of the optical transmitter 101.

The optical transmitter 101 is configured to receive and transmit incident laser light or target laser light.

The optical transmitter 101 may be an optical fiber used to receive and transmit incident laser light and target laser light. Optionally, the optical transmitter 101 can also receive and transmit the ASE in the collimated laser light reflected by the filter 103.

The optical transmitter 101 can receive the incident laser amplified and emitted by the gain fiber connected to the optical fiber amplifier of this level and transmit it to the optical lens 102, or it can receive the target laser reflected back by the optical reflector 104 and transmit it to the optical fiber of this level. Gain fiber in amplifier.

The optical lens 102 is configured to shape the incident laser light to obtain collimated laser light and emit it to the filter 103 .

The optical lens 102 may be a single lens, or may be a lens composed of a set of Effective Focal Length (EFL) lenses that are fixedly installed or bonded together. Of course, it is not limited to this.

It should be noted that after the incident laser emitted by the optical transmitter 101 breaks away from the optical fiber constraint of the optical transmitter 101, and then enters the optical lens 102 in a divergent manner, the optical lens 102 has the ability to detect both the incident laser and the superimposed ASE in the incident laser. With good transmission quality, it can also be reshaped. In this way, after the incident laser passes through the optical lens 102, a collimated laser with a parallel propagation direction is obtained. It can be understood that the collimated laser includes effective signal laser and ASE.

The shaping may be a process in which the optical lens 102 changes the spatial shape distribution of the incident laser and adjusts the divergent incident laser into a parallel laser. For example, it may be a process of adjusting a small circular spot of the incident laser into a large circular spot. light spot.

The filter 103 is configured to reflect the amplified spontaneous emission noise in the collimated laser to the optical transmitter 101 and transmit the target laser to the optical reflector 104, or is configured to reflect the target laser to the optical transmitter 101 and transmit the collimated laser. The spontaneous emission noise in the direct laser is amplified to the photoreflector 104 .

As shown in FIG. 2 , the filter is a bandpass filter 1031 that can pass laser light in a target frequency band and reflect signals of other frequencies. Optionally, the target frequency band of the bandpass filter 1031 may be the same as or similar to the frequency band of the signal laser in the collimated laser. In order to allow the signal laser in the collimated laser to pass through, the ASE in the collimated laser is reflected to the optical transmitter 101 at the same time.

As shown in Figure 3, the filter can also be a band inverse filter 1032 that reflects the laser of the target frequency band and allows signals of other frequencies to be reflected. Optionally, the target frequency band of the inverse filter 1032 may be the same as or similar to the frequency band of the signal laser in the collimated laser. To allow the ASE in the collimated laser to pass, and at the same time reflect the target laser in the collimated laser to the optical transmitter 101 .

Alternatively, the filter 103 may be made of multiple layers of dielectric coatings on a single substrate, or may be made of a set of sub-plates including dielectric coatings, or may be made of various diffraction gratings, including It is not limited to Volume Bragg Gratings (VBG for short), holographic diffraction gratings, or prisms, etc., of course, it is not limited to this.

The optical reflector 104 is configured to reflect the amplified spontaneous emission noise in the target laser or the collimated laser to the optical transmitter 101 .

The light reflector 104 can be a reflective device or mirror with high reflectivity for the target laser, used to completely reflect the received target laser or the ASE in the collimated laser to the optical transmitter through the filter 103 and the optical lens 102 101.

It should be noted that, as shown in Figure 2, when the filter is a band-pass filter 1031 that allows the target laser to pass and reflect the ASE, both the band-pass filter 1031 and the light reflector 104 can adjust the inclination angle to achieve The ASE reflected by the bandpass filter 1031 and the target laser reflected by the light reflector 104 have different incident point positions on the optical transmitter 101 .

Alternatively, the incident laser input end of the optical lens 102 and the incident laser output end of the optical transmitter 101 can be made into one piece through adhesive material or other fixing methods. Both the filter 103 and the light reflector 104 can be devices with adjustable tilt angles.

Next, the working process of the light retroreflector provided by the embodiment of the present application will be briefly described.

As shown in FIG. 1 , first, the optical transmitter 101 receives the incident laser light emitted by the previous device and transmits it to the optical lens 102 . Alternatively, the former device can be a gain fiber.

After the optical lens 102 performs beam expansion and collimation processing on the incident laser, a collimated laser with a parallel propagation direction is obtained and emitted to the filter 103 .

According to the properties of the filter 103, the filter 103 can pass the effective signal laser in the collimated laser, that is, the target laser, while reflecting the ASE in the collimated laser, or allow the ASE to pass and reflect the target laser.

The light reflector 104 completely reflects the received target laser or ASE, and after passing through the filter 103 and the optical lens 102, it is incident from the device in the optical transmitter 101 that receives the target laser. Alternatively, the device may be the same as the device emitting incident laser light described above.

In this embodiment, the filter can reflect the effective target laser in the collimated laser back into the optical transmitter, and at the same time guide the ASE in the collimated laser to a different position from the target laser, so as to redirect the target laser again with minimal loss. It is sent into the optical transmitter to block the damage caused by ASE to other devices.

Optionally, as shown in Figures 4 and 5, the filter 103 is set at a first preset angle relative to the direction of the vertical optical axis or the light reflector 104 is set at a second preset angle relative to the direction of the vertical optical axis. The filter 103 reflects the amplified spontaneous emission noise in the collimated laser to the optical transmitter 101, and transmits the target laser to the optical reflector 104. The optical reflector 104 reflects the target laser to the optical transmitter 101 and the amplified spontaneous emission noise in the collimated laser. different locations.

As shown in Figure 4, when the filter 103 is a band-pass filter that allows the target laser to pass and reflect the ASE, the angle between the filter 103 and the vertical direction can be set to a first preset angle to reduce the collimated laser. The ASE is reflected to other locations in the optical transmitter 101 except the target laser.

As shown in FIG. 5 , the angle between the light reflector 104 and the vertical direction can be set to a second preset angle to reflect the target laser to a different position in the optical transmitter 101 than the ASE reflected by the bandpass filter 1031 .

It can be understood that the inclination angles of both the filter 103 and the light reflector 104 can be adjusted so that the ASE reflected by the filter 103 and the target laser reflected by the light reflector 104 have different incident point positions on the optical transmitter 101 Purpose.

In this embodiment, the filter and the light reflector reflect the ASE and the target laser to different positions by adjusting their own inclination angles, thereby filtering the ASE.

Optionally, as shown in FIGS. 6 and 7 , the filter 103 is set to a third preset angle relative to the direction of the vertical optical axis or the light reflector 104 is set to a fourth preset angle relative to the direction of the vertical optical axis. 103 reflects the target laser to the optical transmitter 101, and transmits the amplified spontaneous emission noise in the collimated laser to the optical reflector 104. The optical reflector 104 reflects the amplified spontaneous emission noise in the collimated laser to the optical transmitter 101 and is in contact with the target laser. different locations.

Optionally, as shown in FIG. 6 , when the filter 103 is an inverse filter that allows ASE to pass and reflects the target laser, the angle between the filter 103 and the vertical direction can be set to a third preset angle, so as to achieve accurate alignment. The ASE in the straight laser passes through, and the target laser in the collimated laser is reflected to other locations in the optical transmitter 101 except the ASE.

As shown in FIG. 7 , the optical reflector 104 can adjust its inclination angle to the fourth preset angle so that the incident point of the reflected ASE in the optical transmitter 101 is at the same position as the incident point of the target laser reflected by the filter 103 different.

It can be understood that the filter 103 and the light reflector 104 can adjust their inclination angles synchronously to achieve different positions of the target laser reflected by the filter 103 and the ASE reflected by the light reflector 104 at the incident point of the optical transmitter. Purpose.

In this embodiment, the filter and the light reflector reflect the target laser and the ASE to different positions by adjusting their own inclination angles, thereby realizing filtering of the ASE.

Optionally, as shown in Figures 8 and 9, the optical transmitter 101 includes: a first optical core 101a, a second optical core 101b and a first end cover 101c.

The first optical core 101a is used to transmit incident laser light or target laser light.

The second optical core 101b is used to receive and transmit the amplified spontaneous emission noise reflected by the filter or light reflector.

The first end cap 101c is used to reduce the optical power density of the incident laser or the target laser.

The optical transmitter 101 may be a single or double hole sleeve made of glass, ceramic, metal or other polished hard material. When the optical transmitter 101 is a single-hole sleeve, the first optical core 101a and the second optical core 101b can be fixed side by side in the same hole to form an optical fiber with a polished end face at the tail end. When the optical transmitter 101 is a double-hole sleeve, the first optical core 101a and the second optical core 101b can be respectively fixed in different sleeves and made into optical fibers with polished end faces. Of course, this is not a limitation.

The tail ends of the first optical core 101a and the second optical core 101b may have end caps or may not have end caps, which are not limited in this application.

The surfaces of the first optical core 101a and the second optical core 101b in the optical transmitter 101 may or may not be provided with anti-reflective coatings.

Among them, the first optical core 101a can be a device used to transmit the received incident laser or target laser, and can realize the transmission of signal laser, ASE and other lasers. The second optical core 101b may be a device only used to transmit ASE, capable of receiving and transmitting the ASE in the collimated laser reflected by the filter 103 or the ASE reflected by the light reflector 104.

Optionally, the diameter of the second optical core 101b may be greater than or equal to the first optical core 101a.

Both the first optical core 101a and the second optical core 101b have good transmittance for light of various wavelengths such as signal laser, ASE and target laser among the incident lasers, and will not be damaged or aged due to the passage of the above light.

The first end cap 101c can be a short cap structure made of glass fiber, quartz or other materials, and is disposed at the bonding point between the optical transmitter 101 and the optical lens 102. The first optical core 101a and the second optical core 101b are The position of the laser entrance can be formed by welding or laser fusion to the fiber end face.

The first end cap 101c can reduce the optical power density of the incident laser and the target laser by expanding the beam thereof, so as to reduce damage to the optical transmitter 101 caused by the high-power incident laser and the target laser.

Figure 8 shows a schematic structural diagram of the first optical core 101a and the second optical core 101b being fixed on a double-hole sleeve. Figure 9 shows a structure where the first optical core 101a and the second optical core 101b are both fixed on a single-hole sleeve. Schematic.

As shown in FIGS. 8 and 9 , the incident laser light is transmitted through the first optical core 101 a and enters the optical lens 102 . After being shaped by the optical lens 102 , the collimated laser light is obtained and emitted to the filter 103 .

The filter 103 passes the signal laser beam among the collimated laser beams, and the target laser beam is reflected by the photoreflector 104 into the first optical core 101a. At the same time, the filter 103 reflects the ASE in the collimated laser light and reflects it into the second optical core 101b through the optical lens.

Alternatively, the filter 103 passes the ASE in the collimated laser light and reflects it into the second optical core 101b through the light reflector 104, and the filter 103 reflects the target laser light into the first optical core 101a.

It can be understood that in the above process, the tilt angle of the filter 103 and the light reflector 104 is related to the position of the second optical core 101b, so that the reflected ASE can enter the second optical core 101b. The inclination angle of the filter 103 and the light reflector 104 is also related to the position of the first optical core 101a, so that the target laser can enter the first optical core 101a.

In this embodiment, the optical transmitter is composed of two first optical cores and a second optical core with different functions, which realizes separate transmission of the ASE and the target laser and avoids damage to the device by the ASE.

Optionally, as shown in FIG. 2 and FIG. 10 , the directions of the tail end surfaces of the first optical core and the second optical core relative to the vertical optical axis are both set at a fifth preset angle.

Taking the first optical core 101a and the second optical core 101b respectively being fixed in different holes as an example, Figure 8 can show the rear end surfaces of the first optical core 101a, the second optical core 101b and the rear end surface of the sleeve relative to the vertical optical axis. The top view of the laser transmitting in the light retroreflector when the directions are all set to the fifth preset angle. Figure 10 shows the tail end surfaces of the first optical core, the second optical core and the tail end surface of the sleeve relative to the vertical optical axis. Side view of laser light transmitted in the light retroreflector when the directions are set to the fifth preset angle. For example, the first preset angle may be 8 degrees.

As shown in Figures 8 and 10, the tail end surfaces of the first optical core and the second optical core are polished to an oblique angle of 8 degrees. In this way, the incident laser or ASE can be better coupled into the first optical core and the second optical core. In the core.

In this embodiment, the rear end surface of the first optical core, the second optical core and the front end surface of the optical lens are all polished to the same fifth preset angle, which not only enables the optical transmitter and the optical lens to be connected more closely, but also This enables the incident laser or ASE to be better coupled into the first optical core and the second optical core.

Optionally, as shown in Figure 11, the optical transmitter 101 includes: an incident optical core 101d and a second end cover 101e.

The incident light core 101d is used to transmit incident laser light or target laser light.

The second end cap 101e is used to reduce the optical power density of the incident laser or the target laser.

Alternatively, the optical transmitter 101 can also be configured as a single hole structure, and an incident optical core 101d for transmitting incident laser light or target laser light is fixed in the single hole.

The tail end of the optical transmitter 101 may be a flat surface or an inclined surface, which is not limited in this application.

The second end cap 101e can be made of the same material as the above-mentioned first end cap, and is disposed at the bonding point between the optical transmitter 101 and the optical lens 102 at the input position of the incident laser and the target laser incident on the optical core 101d.

The second end cap 101e can also be used to reduce the optical power density of the incident laser and the target laser through beam expansion, so as to avoid damage to the optical transmitter 101 by the high-power incident laser and the target laser.

FIG. 11 shows a side view of laser light transmitted in an optical retroreflector when the optical transmitter 101 includes an incident optical core 101d.

When the intensity of the ASE contained in the incident laser light is low, the optical transmitter 101 may adopt the structure shown in FIG. 11 .

The workflow of the light retroreflector using the structure shown in Figure 11 is as follows:

First, the incident optical core 101d in the optical transmitter 101 receives the incident laser, and transmits it to the optical lens 102 for beam expansion and collimation processing to obtain the collimated laser and emit it to the filter 103.

The filter 103 passes the signal laser light in the collimated laser light to obtain the target laser light and emit it to the light reflector. At the same time, the filter 103 can reflect the ASE or other laser light in the collimated laser to other positions of the optical transmitter 101 except the incident optical core 101d by adjusting its own tilt angle.

Alternatively, the filter 103 passes the ASE in the collimated laser light and reflects the target laser light to other positions of the optical transmitter 101 except the incident optical core 101d.

The light reflector 104 adjusts its tilt angle to reflect the target laser light into the incident optical core 101d for transmission.

In this embodiment, an optional structure is provided for incident laser light with low ASE intensity, which simplifies the structure of the light retroreflector and improves the flexibility and applicability of the light retroreflector.

Optionally, continuing to refer to FIG. 11 , the direction of the rear end surface of the incident light core 101d relative to the vertical optical axis is set to a sixth preset angle.

The same as in the above embodiment, when the optical transmitter 101 includes the incident optical core 101d, the angle between the inclination angle of the rear end surface of the incident optical core 101d and the vertical direction, and the rear end of the sleeve of the optical transmitter 101 can be set It is the sixth preset angle. For example, the sixth preset angle may be 8 degrees.

In this embodiment, the inclination angle of the rear end surface of the incident optical core can be a sixth preset angle, so as to make the coupling between the optical transmitter and the optical lens closer, and also to enable the incident laser to be better coupled into the optical core. .

Optionally, as shown in Figures 12 and 13, the light retroreflector further includes: a light dumper 101f.

The light dumper 101f is used to receive and store the amplified spontaneous emission noise reflected by the filter 103 or the light reflector 104.

Alternatively, the light dumper 101f may be a beam dumper for storing laser energy.

As shown in Figure 12, when the optical transmitter 101 includes a first optical core 101a and a second optical core 101b, the optical dumper 101f can be disposed at the ASE exit end of the second optical core 101b to collect light generated by the filter 103 or ASE reflected by reflector 104.

Another optional implementation is shown in Figure 13. When the optical transmitter 101 includes the incident optical core 101d, the optical dumper 101f can be disposed below the incident optical core 101d to collect the light collected by the filter 103 or the optical reflector. 104 Reflected ASE. It can be understood that since the ASE reflected by the filter 103 or the light reflector 104 is in multiple different directions, the light dumper 101f may only collect a part of the ASE at this time.

Optionally, the light dumper 101f can also be used to monitor the intensity of collected ASEs.

In this embodiment, a light dump for collecting ASE is provided in the light retroreflector, which improves the utilization efficiency of ASE and the energy conversion rate of the light retroreflector.

Optionally, as shown in FIGS. 10 and 11 , the direction of the end surface of the optical lens 102 close to the optical transmitter 101 relative to the vertical optical axis is set to a seventh preset angle.

It can be understood that when the optical transmitter 101 provided in the above embodiment includes a first optical core 101a and a second optical core 101b, and the angle between the inclination angle of the tail end surface and the vertical direction is the fifth preset angle , the angle between the end face of the optical lens 102 fixedly connected to the optical transmitter 101 and the vertical direction can be set to a seventh preset angle to ensure tight coupling between the optical lens 102 and the optical transmitter 101 . At this time, the seventh preset angle may be equal to the fifth preset angle.

Alternatively, when the optical transmitter 101 includes an incident light core, and the angle between the inclination angle of its rear end face and the vertical direction is the sixth preset angle, the end face of the optical lens 102 fixedly connected to the optical transmitter 101 needs to be aligned with the vertical direction. The included angle can be set to a seventh preset angle to ensure tight coupling between the optical lens 102 and the optical transmitter. At this time, the seventh preset angle may be equal to the sixth preset angle.

In this embodiment, the inclination angle of the end face of the optical lens is set to a seventh preset angle that is equal to the inclination angle of the tail end face of the optical transmitter, so that the optical lens can be tightly coupled with the optical transmitter.

Optionally, the length of the optical lens is greater than the preset length.

It should be noted that the length of the optical lens needs to be set to be greater than the preset length, so that the optical lens can expand and collimate the incident laser output from the optical transmitter.

In this embodiment, the length of the optical lens is explained so that the optical lens can meet the requirements for beam processing and improve the reliability of the optical retroreflector.

Optionally, the distance between the optical lens and the filter is greater than the preset distance.

In addition, there is a certain distance between the optical lens and the filter. This distance can be greater than the preset distance, so that the distance between the filter and the optical transmitter is long enough, and the filter can reflect the ASE to the The second optical core or incident optical core of the optical transmitter.

In this embodiment, the distance between the optical lens and the filter is explained, so that the filter can reflect the ASE in a different direction from the target laser, thereby improving the reliability of the optical retroreflector.

As shown in Figure 14, the embodiment of the present application also provides an optical relay device, including: a multi-stage optical fiber amplifier; each stage of the optical fiber amplifier includes: an optical retroreflector and an amplifier gain according to any one of the previous embodiments. Optical fiber and optical router, the first port of the optical router is used to receive the initial laser, the second port of the optical router is connected to the first end of the amplifier gain fiber, the third port of the optical router is used to emit the outgoing laser, and the third port of the amplifier gain fiber The two ends are connected to the first end of the light retroreflector.

The optical relay device may be a device installed in an optical fiber communication line to amplify laser signals. The optical relay device may include a multi-stage optical fiber amplifier to cooperatively amplify the incident laser signal.

Optical fiber amplifiers at all levels can include: optical routers, amplifier gain fibers, and optical retroreflectors. Among them, the optical routers in the optical fiber amplifiers at each stage may include multiple ports, which are used to receive the initial laser, emit the outgoing laser, or connect to the gain fiber.

Taking the first-stage optical fiber amplifier 201 as an example, after the first-stage optical router 2011 receives the initial laser, it sends it to the first-stage amplifier gain fiber 2012 for amplification, and then the first-stage optical retroreflector in the aforementioned embodiment In 2013, the amplified initial laser is injected into the first-stage optical retroreflector 2013 as the incident laser. The first-stage optical retroreflector 2013 filters and reflects the incident laser to obtain the target laser and passes through the first-stage amplifier. The gain fiber 2012 amplifies again, and finally the first-stage optical router 2011 emits the outgoing laser to the next-stage fiber amplifier.

It can be understood that the second-stage optical router 2021 in the second-stage optical fiber amplifier 202, the second-stage amplifier gain fiber 2022, the second-stage optical retroreflector 2023 to the N-th stage optical fiber in the N-th stage optical fiber amplifier 203 The process of light reflection and filtering by the router 2031, the N-th stage amplifier gain fiber 2032, and the N-th stage optical retroreflector 2033 is the same as that of the first-stage optical fiber amplifier 201, and will not be described again here.

In this embodiment, a possible implementation of applying the optical retroreflector provided in the above embodiment to an optical relay device is provided to achieve pre-gain and post-gain ASE in the optical relay device. Filtering improves the signal quality of the fiber optic amplifier.

As shown in Figure 15, an embodiment of the present application also provides a fiber laser. The fiber laser includes: a multi-stage fiber amplifier; each stage of the fiber amplifier includes: a light retroreflector and a laser gain according to any one of the previous embodiments. Optical fiber and optical router, the first port of the optical router is used to receive the initial laser, the second port of the optical router is connected to the first end of the laser gain fiber, the third port of the optical router is used to emit the outgoing laser, and the third port of the laser gain fiber The two ends are connected to the light retroreflector.

The same as the optical relay device in the previous embodiment, the fiber laser also contains a multi-stage cooperatively working fiber amplifier, where the first fiber amplifier 301 may include a first optical router 3011, a first laser gain fiber 3012, a first The optical retroreflector 3013 and the second optical fiber amplifier 302 may include a second optical router 3021, a second laser gain fiber 3022, and a second optical retroreflector 3023, until the Nth optical fiber amplifier 303 may include the Nth optical router 3031, The process of the Nth laser gain fiber 3032 and the Nth light retroreflector 3033, and the fiber amplifiers at all levels working together is the same as the process of the fiber amplifiers at all levels working together in the optical relay device in the above embodiment, and this application will not be repeated here. Repeat.

In this embodiment, a fiber laser using the optical retroreflector provided in the previous embodiment is provided, which can filter out the ASE in the incident laser and avoid the interference of the ASE on the effective signal laser. It improves the communication quality and avoids ASE damage to other devices during laser transmission.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application. All are covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims (11)

1. A light reversing light reflector, comprising: the optical lens is arranged at the incident laser emission end of the optical transmitter;

the optical transmitter is configured to receive and transmit the incident laser light or the target laser light;

the optical lens is configured to shape the incident laser to obtain collimated laser and transmit the collimated laser to the filter;

the filter is configured to reflect the amplified spontaneous emission noise in the collimated laser light to the optical transmitter and transmit the target laser light to the optical reflector, or configured to reflect the target laser light to the optical transmitter and transmit the amplified spontaneous emission noise in the collimated laser light to the optical reflector;

the light reflector is configured to reflect amplified spontaneous emission noise in the target laser light or the collimated laser light to the optical transmitter.

2. The light reflecting mirror according to claim 1, wherein the filter sets a first preset angle with respect to a direction perpendicular to the optical axis or the mirror sets a second preset angle with respect to a direction perpendicular to the optical axis, the filter reflects amplified spontaneous emission noise in the collimated laser light to the optical transmitter and transmits the target laser light to the mirror, and the mirror reflects the target laser light to a position in the optical transmitter different from the amplified spontaneous emission noise in the collimated laser light.

3. The light-reversing light reflector of claim 1, wherein the filter sets a third preset angle with respect to a direction perpendicular to the optical axis or the light reflector sets a fourth preset angle with respect to a direction perpendicular to the optical axis, the filter reflects the target laser light to the light transmitter and transmits amplified spontaneous emission noise in the collimated laser light to the light reflector, the light reflector reflects amplified spontaneous emission noise in the collimated laser light to a position in the light transmitter different from the target laser light.

4. A light reversing light reflector according to any one of claims 1 to 3, wherein the light transmitter comprises: the first optical core, the second optical core and the first end cover;

the first optical core is used for transmitting incident laser or target laser;

the second optical core is used for receiving and transmitting amplified spontaneous emission noise reflected by the filter or the light reflector;

the first end cover is used for reducing the optical power density of the incident laser or the target laser.

5. The light-reflecting mirror according to claim 4, wherein the trailing end surfaces of the first and second optical cores are each set at a fifth predetermined angle with respect to a direction perpendicular to the optical axis.

6. A light reversing light reflector according to any one of claims 1 to 3, wherein the light transmitter comprises: an incident optical core and a second end cap;

the incident optical core is used for transmitting incident laser or target laser;

the second end cover is used for reducing the optical power density of the incident laser or the target laser.

7. The light-reversing light reflector of claim 6, wherein the trailing end face of the incident light core is disposed at a sixth predetermined angle with respect to a direction perpendicular to the optical axis.

8. A light reversing light reflector according to any one of claims 1 to 3, further comprising: a light transfer reservoir;

the optical dump is used for receiving and storing amplified spontaneous emission noise reflected by the filter or the optical reflector.

9. A light-reversing light reflector according to any one of claims 1 to 3, wherein an end face of the light lens adjacent to the light transmitter is disposed at a seventh preset angle with respect to a direction perpendicular to the optical axis.

10. An optical relay device, comprising: a multi-stage optical fiber amplifier; each stage of optical fiber amplifier comprises: the optical reverse reflector, the amplifier gain fiber, and the optical router of any of claims 1-9, wherein a first port of the optical router is configured to receive an initial laser light, a second port of the optical router is coupled to a first end of the amplifier gain fiber, a third port of the optical router is configured to emit an outgoing laser light, and a second end of the amplifier gain fiber is coupled to a first end of the optical reverse reflector.

11. A fiber laser, the fiber laser comprising: a multi-stage optical fiber amplifier; each stage of optical fiber amplifier comprises: the optical reverse reflector, laser gain fiber, and optical router of any of claims 1-9, wherein a first port of the optical router is configured to receive an initial laser light, a second port of the optical router is coupled to the first end of the laser gain fiber, a third port of the optical router is configured to emit an outgoing laser light, and a second end of the laser gain fiber is coupled to the optical reverse reflector.