CN211348710U - Unilateral fiber outlet optical isolator - Google Patents
Unilateral fiber outlet optical isolator Download PDFInfo
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- CN211348710U CN211348710U CN202020093246.9U CN202020093246U CN211348710U CN 211348710 U CN211348710 U CN 211348710U CN 202020093246 U CN202020093246 U CN 202020093246U CN 211348710 U CN211348710 U CN 211348710U
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Abstract
The utility model provides a unilateral fine optical isolator that goes out for in the optical communication field, this unilateral fine optical isolator that goes out have included input fiber, output fiber, input beam split/close optical device, output beam split/close optical device, input optical device, output optical device, lens, Faraday optical rotator, speculum. This scheme is through the light path scheme that adopts the speculum, and this unilateral fine optical isolator that goes out only needs to adopt a collimater, and input and output lie in the same one side of device, and this volume that just makes its bilateral fine optical isolator that goes out of mainstream is littleer, the cost is lower, the assembly process is more simple and convenient. Meanwhile, the unilateral fiber-outgoing optical isolator also has the advantages that the light splitting/combining device is fixed on the end face of the input/output optical fiber, so that the requirement on the light splitting/combining device is smaller in volume, the structure is more compact, and the material cost is lower.
Description
Technical Field
The utility model relates to a light passive device in the optical fiber communication field, especially a unilateral fine optical isolator that goes out.
Background
In optical fiber communication systems, there is a varying degree of reverse light on the transmission line from the optical fiber and the end faces of the nodes. These backward light severely interferes with the normal output of the laser, producing conditions such as intensity fluctuations, frequency drift, modulation bandwidth degradation, noise enhancement, and even disrupts the normal operation of the laser. At the same time, the backward light also causes the system transmission performance to deteriorate, the gain of the optical amplifier to change and self-excitation occurs, and finally, the error code is generated. The optical isolator is a non-reciprocal device which only allows unidirectional transmission of light, can effectively inhibit transmission of reverse light, reduces damage of the reverse light to the laser, maintains working stability of the laser, and prolongs service life of the laser. Therefore, the optical isolator is used as an important optical passive device and widely applied to high-speed large-capacity optical fiber communication systems.
With the development of technology in the whole communication industry, the miniaturization and cost reduction of the optical passive device will continue to be an important trend of the technology development thereof, which is not only a demand from the development of the industry technology, but also an urgent demand from the market. The mainstream optical isolator in the current market is a bilateral fiber-out device, a dual-collimator structure is adopted, the whole size is limited by the size of the collimator, the size can not be further reduced, the required assembly space is large, and the material cost is high. Meanwhile, because the input optical fiber and the output optical fiber are positioned at two sides of the device, when the input optical fiber and the output optical fiber are applied to a module and are cascaded with other devices, the optical fibers at two sides need to be respectively coiled, and the process is complex.
Disclosure of Invention
To the situation of the prior art, the utility model aims at providing a unilateral fine isolator that goes out of small, with low costs, the assembly process of structure.
In order to realize the technical purpose, the utility model discloses a technical scheme does:
a unilateral fiber-outgoing optical isolator comprises an input optical fiber, an output optical fiber, an input light splitting/combining device, an output light splitting/combining device, an input optical rotation device, an output optical rotation device, a lens, a Faraday optical rotator and a reflector which are arranged in sequence; the Faraday rotator comprises a magneto-optical crystal and a magnetic field device; the end faces of the input optical fiber and the output optical fiber close to the lens are positioned in the same plane; the input light splitting/combining device and the input optical rotation device correspond to the input optical fiber and are sequentially fixed on the end face of the input optical fiber, which is close to the lens, namely the input light splitting/combining device is fixed on the input optical fiber, and the input optical rotation device is fixed on the input light splitting/combining device; the output light splitting/combining device and the output optical rotation device correspond to the output optical fiber and are sequentially fixed on the end face of the output optical fiber close to the lens, namely the output light splitting/combining device is fixed on the output optical fiber, and the output optical rotation device is fixed on the output light splitting/combining device; two focal planes are arranged on two outer sides of the lens, the plane where the transmission end faces corresponding to the input optical fiber and the output optical fiber are located is located on one focal plane of the lens, and the reflecting surface of the reflector is located on the other focal plane of the lens; the Faraday rotator is positioned between the lens and the reflector;
when an incident beam is input from an input optical fiber, the incident beam is split by an input light splitting/combining device, enters an input optical rotation device for optical rotation, then enters a lens to form a collimated beam, then is optically rotated by a Faraday optical rotator, then enters a reflector for reflection, then returns to the Faraday optical rotator for optical rotation, then enters an output optical rotation device for optical rotation, then enters an output light splitting/combining device for light combination, and finally enters an output optical fiber for output;
when an incident beam is input from an output optical fiber, the incident beam is split by an output light splitting/combining device and then enters an output optical rotation device for optical rotation, then enters a lens to form a collimated beam, then is optically rotated by a Faraday optical rotator, then is incident to a reflector and then is reflected, so that the collimated beam returns to the Faraday optical rotator for optical rotation, then is incident to an input optical rotation device for optical rotation, then enters an input light splitting/combining device again, light combination cannot be realized, and output isolation is realized on an input optical fiber.
As a possible implementation manner, the number of the input optical fibers and the output optical fibers is equal and is 2N, N is an integer of 1 or more, the input optical fibers and the output optical fibers are combined to form a porous optical fiber head or an optical fiber array, and the arrangement combination between the input optical fibers and the output optical fibers is a central symmetry structure.
Furthermore, the input light splitting/combining device and the output light splitting/combining device are a displacement type birefringent crystal and are used for splitting/combining o light and e light in the crystal; the optical axis of the birefringent crystal is oblique to the crystal surface, and the separation direction of the o light and the e light is vertical to the propagation direction of the light beam and parallel to the relative displacement direction of the input optical fiber and the output optical fiber.
Optionally, the optical axis angles of the o light and the e light of the birefringent crystal are 45 degrees, and when the thicknesses of the crystals are consistent, the separation distance of the o light and the e light is the largest.
Optionally, the directions of the optical axes of the input light splitting/combining device and the output light splitting/combining device are consistent or perpendicular to each other; the input splitting/combining device and the output splitting/combining device may be a plurality of devices independent of each other or combined into the same device.
Further, the input optical rotation device and the output optical rotation device are 1/2 lambda phase delay type quartz wave plate crystals for rotating the polarization direction of linearly polarized light; the optical axes of the input and output optical rotation devices are oblique to the crystal surface. The input optical rotation device and the output optical rotation device are combined to realize that the total rotation angle of the linearly polarized light in the polarization direction is 45 degrees.
Optionally, the optical rotation angle of the input optical rotation device is 0 degree, and the optical rotation angle of the output optical rotation device is 45 degrees; or the optical rotation angle of the input optical rotation device is 45 degrees, and the optical rotation angle of the output optical rotation device is 0 degree.
Optionally, the optically active device rotates at an angle of 45 degrees with its optical axis at an angle of 67.5 degrees or 22.5 degrees to the crystal surface; the rotation angle of the optical rotation device is 0 degree, and the angle between the optical axis and the surface of the crystal is 0 degree or 90 degrees.
Further, the lens is a C-lens or other lens form with double-sided focal planes for focusing and collimating the light beam.
Further, the Faraday rotator is used for rotating the polarization direction of linearly polarized light, and the rotating angle is 22.5 degrees.
Alternatively, the Faraday rotator may be a combination of a magneto-optical crystal and a magnetic field device, or may be a single magneto-optical crystal.
Optionally, the magnetic field device is a permanent magnet, which may be a magnetic ring or a parallel flat plate made of a magnetic material, and is configured to provide a saturation magnetic field strength of the magneto-optical crystal, so that the magneto-optical crystal realizes fixed rotation of the polarization direction of linearly polarized light; the magnetic field direction is parallel to the light propagation direction.
Alternatively, when linearly polarized light is incident from the magnetic field N order, the polarization direction rotates clockwise; when linearly polarized light is incident from the magnetic field S order, the polarization direction rotates counterclockwise.
Further, when the optical axis directions of the input light splitting/combining device and the output light splitting/combining device are consistent, the input optical rotation device, the output optical rotation device and the Faraday optical rotator are combined to realize that the total rotation angle of linearly polarized light in forward input is 90 degrees, and the total rotation angle of linearly polarized light in reverse input is 0 degree; when the directions of the optical axes of the input light splitting/combining device and the output light splitting/combining device are mutually vertical, the input optical rotation device, the output optical rotation device and the Faraday optical rotator are combined to realize that the total rotation angle of linearly polarized light in forward input is 0 degree, and the total rotation angle of linearly polarized light in reverse input is 90 degrees.
Furthermore, the reflector is a glass flat sheet with a certain thickness, and the reflecting surface is plated with a high-reflectivity film layer.
Adopt foretell technical scheme, compared with the prior art, the utility model, its beneficial effect who has is: firstly, this scheme is through adopting the speculum to realize the light turn, makes the device only need use a collimator, and this compares traditional isolator and has reduced a collimator, and the device volume reduces half, and the required space of equipment has also reduced half in the module, and material cost has also correspondingly reduced. Secondly, the input and the output of the scheme are positioned at the same side of the device, and single-side wire coiling can be carried out simultaneously when the module is assembled, so that the process of wire coiling assembly is simplified. Meanwhile, the light splitting/combining device is fixed on the end face of the input/output optical fiber, so that the input/output controllability is stronger, the function expansibility is higher, the volume required by the light splitting/combining device is smaller, the structure is more compact, and the material cost is lower.
Drawings
The invention will be further explained with reference to the drawings and the detailed description below:
fig. 1 is a three-dimensional schematic structural view of an embodiment 1 of the single-side fiber-outlet optical isolator of the present invention;
FIG. 2 is a schematic diagram of the x-z plane of the structure of the single-side fiber-outlet optical isolator of the present invention in the embodiment 1;
FIG. 3 is a schematic y-z plane view of the structure of the single-side fiber-outlet optical isolator of the present invention in accordance with embodiment 1;
fig. 4 is a schematic view of an assembly structure of a light splitting/combining device and a light rotating device in embodiment 1 of the single-side fiber-outgoing optical isolator of the present invention;
fig. 5 is a schematic structural view of the faraday optical rotator in the embodiments 1 and 2 of the single-side fiber-outlet optical isolator of the present invention;
FIG. 6 is a schematic view of a forward optical path x-z plane of the single-side fiber-outlet optical isolator of embodiment 1 of the present invention;
FIG. 7 is a schematic x-z plane view of a reverse optical path of the single-side fiber-outlet optical isolator of embodiment 1 of the present invention;
FIG. 8 is a schematic y-z plane view of the optical path of the single-side fiber-outlet optical isolator of embodiment 1 of the present invention;
FIG. 9 is a schematic x-z plane view of the structure of the single-side fiber-outlet optical isolator of the present invention in accordance with embodiment 2;
FIG. 10 is a schematic y-z plane view of the structure of the single-side fiber-outlet optical isolator of the present invention in accordance with an embodiment 2;
fig. 11 is a schematic view of an assembly structure of a light splitting/combining device and a light rotating device according to embodiment 2 of the single-side fiber-outgoing optical isolator of the present invention;
fig. 12 is a schematic x-z plane view of a forward optical path of the single-side fiber-outlet optical isolator of the present invention in embodiment 2;
fig. 13 is a schematic x-z plane view of a reverse optical path of the single-side fiber-outlet optical isolator of the present invention in embodiment 2;
fig. 14 is a schematic y-z plane view of the optical path of the single-side fiber-outlet optical isolator of the present invention in embodiment 2.
Detailed Description
Example 1
As shown in one of fig. 1 to 3, the structure of the present embodiment includes an input optical fiber 1, an output optical fiber 2, an input beam splitting/combining device 3, an output beam splitting/combining device 4, an input optical rotation device 5, an output optical rotation device 6, a lens 7, a faraday optical rotator 8, and a reflector 9; the end faces of the input optical fiber 1 and the output optical fiber 2 are positioned in the same plane; the input light splitting/combining device 3 is fixed on the input optical fiber 1, and the input optical rotation device 5 is fixed on the input light splitting/combining device 3; two focal planes are arranged outside the lens 7, the planes of the end faces of the input optical fiber 1 and the output optical fiber 2 are positioned on one focal plane of the lens 7, and the reflecting surface of the reflector 9 is positioned on the other focal plane of the lens 7; the Faraday rotator 8 is positioned between the lens 7 and the reflector 9; the output light splitting/combining device 4 is fixed on the output optical fiber 2, and the output optical rotation device 6 is fixed on the output light splitting/combining device 4.
As shown in one of fig. 1 to 3, the input optical fiber 1 and the output optical fiber 2 in the present embodiment are combined into a dual optical fiber head; the two are symmetrically distributed in the x direction relative to the axis of the optical fiber head, and the positions of the two are the same in the y direction; the number of the input optical fibers 1 is 1, and the number of the output optical fibers 2 is 1, so that the function of one input and one output of the isolator is realized.
As shown in fig. 4, the input splitting/combining device 3 and the output splitting/combining device 4 in this embodiment are YVO4 crystals, which are independent of each other and are used for splitting/combining o light and e light in the crystals; the direction of the optical axis 31 of the input light splitting/combining device 3 is consistent with that of the optical axis 41 of the output light splitting/combining device 4, and the angle of the optical axis obliquely crossed with the crystal surface is 45 degrees; the separation direction of the o-beam and the e-beam is perpendicular to the beam propagation direction (z direction) and parallel to the relative displacement direction (x direction) of the input fiber 1 and the output fiber 2, i.e., the separation direction of the o-beam and the e-beam is in the x direction.
As shown in fig. 4, the input optical rotation means 5 and the output optical rotation means 6 in the present embodiment are a half-wave plate for rotating the polarization direction of linearly polarized light; the angle between the optical axis 51 of the input optical rotation device 5 and the x axis is 0 degree, and the rotation angle of linearly polarized light in the x-y plane in the polarization directions such as the x direction, the y direction, the 45 degree direction and the like is 0 degree; the angle between the optical axis 61 of the output optical rotation device 6 and the x-axis is 22.5 degrees, and the rotation angle of linearly polarized light in the x-y plane in the polarization directions such as the x-direction, the y-direction, and the 45-degree direction is 45 degrees.
As shown in fig. 1 to 3, the lens 7 in this embodiment is a C lens, and the lens has two focal planes, front and rear.
As shown in fig. 5, the faraday rotator 8 in this embodiment comprises a magneto-optical crystal 81 and a magnetic field device 82, wherein the magnetic field device 82 is a hollow magnetic ring for providing the saturation magnetic field strength of the magneto-optical crystal, so that the magneto-optical crystal realizes the rotation of the polarization direction of linearly polarized light in the x-y plane, and the rotation angle is 22.5 degrees; the direction of the magnetic field is parallel to the direction of light propagation, i.e. the direction of the magnetic field is along the z-direction; linearly polarized light enters from the magnetic field N level, and the polarization direction rotates clockwise.
As shown in fig. 6, the forward optical path of the x-z plane in this embodiment is: an incident light beam is input from the input optical fiber 1(x, x0, z0) along the z direction; the light is split into o and e lights inside the crystal through the input light splitting/combining device 3, namely, one incident light is split into two linearly polarized lights polarized along the x and y directions respectively; entering an input optical rotation device 5, rotating the polarization directions of the two linearly polarized light beams by 0 degree clockwise; enters the lens 7 to form beam collimation and focusing; the polarization directions of the two linearly polarized light beams rotate through the magneto-optical crystal 81 in the Faraday optical rotator 8 and rotate clockwise by 22.5 degrees; the light beam is focused on a reflecting surface 91 of the reflector 9, the light beam is reflected and returns to the magneto-optical crystal 81 in the Faraday rotator 8, the polarization directions of the two linearly polarized light beams rotate and rotate clockwise by 22.5 degrees; the polarization directions of the two linearly polarized light beams enter an output optical rotation device 6 and rotate clockwise by 45 degrees; so far, the total rotation angle of the two linearly polarized light beams is 90 degrees, and then the linearly polarized light beams enter the output light splitting/combining device 4, so that light combination can be realized; finally, the optical fiber enters the output optical fiber 2 (x-x 0, z-z 0) for output.
As shown in fig. 7, the x-z plane reverse isolation optical path in this embodiment is: an incident light beam is input from the output optical fiber 2 (x-x 0, z0) in the z direction; the o and e lights are separated in the crystal through the output light splitting/combining device 4, namely, one incident light is split into two linearly polarized lights polarized along the x and y directions respectively; the polarization directions of the two linearly polarized light beams enter an output optical rotation device 6 to rotate, and the two linearly polarized light beams rotate 45 degrees anticlockwise; enters the lens 7 to form beam collimation and focusing; the polarization directions of the two linearly polarized light beams rotate through the magneto-optical crystal 81 in the Faraday optical rotator 8 and rotate clockwise by 22.5 degrees; the light beam is focused on a reflecting surface 91 of the reflector 9, the light beam is reflected and returns to the magneto-optical crystal 81 in the Faraday rotator 8, the polarization directions of the two linearly polarized light beams rotate and rotate clockwise by 22.5 degrees; the light enters an input optical rotation device 5, the polarization directions of two linearly polarized light beams rotate, and the rotation angle is 0 degree; so far, the total rotation angle of the two linearly polarized light beams is 0 degree, and then the two linearly polarized light beams enter the input light splitting/combining device 3, so that light combination cannot be realized; the input optical fiber 1 (x-x 0, z-z 0) has no beam output.
As shown in fig. 8, in the present embodiment, the splitting/combining of the light beam is not generated in the y-z plane, and the input optical fiber 1 and the output optical fiber 2 are located at the same y position; the light beam is input from the input optical fiber 1 (y-y 0, z-z 0), and can be returned to the output optical fiber 2 (y-y 0, z-z 0) and output.
Example 2
As shown in one of fig. 9 to 10, the structure of the present embodiment includes an input fiber 11, an input fiber 12, an output fiber 21, an output fiber 22, an input splitting/combining device 3, an output splitting/combining device 4, an input optical rotation device 5, an output optical rotation device 6, a lens 7, a faraday optical rotation device 8, and a mirror 9; the end faces of the input optical fiber 11, the input optical fiber 12, the output optical fiber 21 and the output optical fiber 22 are positioned in the same plane; the input light splitting/combining device 3 is fixed on the input optical fiber 11 and the input optical fiber 12, and the input optical rotation device 5 is fixed on the input light splitting/combining device 3; two focal planes are arranged outside the lens 7, the planes of the end faces of the input optical fiber 11, the input optical fiber 12, the output optical fiber 21 and the output optical fiber 22 are positioned on one focal plane of the lens 7, and the reflecting plane of the reflector 9 is positioned on the other focal plane of the lens 7; the Faraday rotator 8 is positioned between the lens 7 and the reflector 9; the output light splitting/combining device 4 is fixed on the output optical fiber 21 and the output optical fiber 22, and the output optical rotation device 6 is fixed on the output light splitting/combining device 4.
As shown in fig. 11, the input fiber 11(x1, y1), the input fiber 12(x1, -y1), the output fiber 21(-x1, -y1), and the output fiber 22(-x1, y1) in this embodiment are combined into a four-fiber head; the input optical fiber 11(x1, y1) and the output optical fiber 21(-x1, -y1) are symmetrically distributed about the axis of the optical fiber head, and the input optical fiber 12(x1, -y1) and the output optical fiber 22(-x1, y1) are symmetrically distributed about the axis of the optical fiber head; the number of input optical fibers is 2, the number of output optical fibers is 2, and the function of two-in and two-out of the isolator is realized.
As shown in fig. 11, the input splitting/combining device 3 and the output splitting/combining device 4 in this embodiment are YVO4 crystals, which are independent of each other and are used for splitting/combining o light and e light in the crystals; the direction of the optical axis 31 of the input light splitting/combining device 3 is consistent with that of the optical axis 41 of the output light splitting/combining device 4, and the angle of the optical axis obliquely crossed with the crystal surface is 45 degrees; the separation direction of the o-beam and the e-beam is perpendicular to the beam propagation direction (z direction) and parallel to the relative displacement direction (x direction) of the input fiber 1 and the output fiber 2, i.e., the separation direction of the o-beam and the e-beam is in the x direction.
As shown in fig. 11, the input optical rotation means 5 and the output optical rotation means 6 in the present embodiment are a half-wave plate for rotating the polarization direction of linearly polarized light; the angle between the optical axis 51 of the input optical rotation device 5 and the x axis is 0 degree, and the rotation angle of linearly polarized light in the x-y plane in the polarization directions such as the x direction, the y direction, the 45 degree direction and the like is 0 degree; the angle between the optical axis 61 of the output optical rotation device 6 and the x-axis is 22.5 degrees, and the rotation angle of linearly polarized light in the x-y plane in the polarization directions such as the x-direction, the y-direction, and the 45-degree direction is 45 degrees
As shown in one of fig. 9 to 11, the lens 7 in this embodiment is a C lens having front and rear focal planes.
With reference to fig. 5, the faraday rotator 8 in this embodiment includes a magneto-optical crystal 81 and a magnetic field device 82, where the magnetic field device 82 is a hollow magnetic ring for providing the saturation magnetic field strength of the magneto-optical crystal, so that the magneto-optical crystal realizes the rotation of the polarization direction of linearly polarized light in the x-y plane, and the rotation angle is 22.5 degrees; the direction of the magnetic field is parallel to the direction of light propagation, i.e. the direction of the magnetic field is along the z-direction; linearly polarized light enters from the magnetic field N level, and the polarization direction rotates clockwise.
As shown in fig. 12, the forward optical path of the x-z plane in this embodiment is: two incident light beams are respectively input from the input optical fiber 11(x is x1, z is z0) and the input optical fiber 12(x is x1, z is z0) along the z direction; the light is split into o and e lights inside the crystal through the input light splitting/combining device 3, namely each incident light is split into two linearly polarized lights polarized along the x and y directions respectively; the polarization direction of the four linearly polarized light beams enters an input optical rotation device 5 and rotates clockwise by 0 degree; enters the lens 7 to form beam collimation and focusing; the polarization directions of the four beams of linearly polarized light rotate by 22.5 degrees clockwise after passing through a magneto-optical crystal 81 in the Faraday optical rotator 8; the light beam is focused on a reflecting surface 91 of the reflector 9, the light beam is reflected and returns to the magneto-optical crystal 81 in the Faraday rotator 8, the polarization directions of the four linearly polarized light beams are rotated, and the four linearly polarized light beams are rotated by 22.5 degrees clockwise; the polarization direction of the four linearly polarized light beams enters an output optical rotation device 6 and rotates clockwise by 45 degrees; at this time, the total rotation angle of the four linearly polarized light beams is 90 degrees, the four linearly polarized light beams enter the output light splitting/combining device 4, light combination can be realized, and two outgoing light beams are formed corresponding to two incident light beams; finally, the optical fiber enters the output optical fiber 21 (x-x 1, z-z 0) and the output optical fiber 22 (x-x 1, z-z 0) respectively for output.
As shown in fig. 13, the x-z plane reverse isolation optical path in this embodiment is: two incident light beams are respectively input from an output optical fiber 21 (x-x 1, z-z 0) and an output optical fiber 22 (x-x 1, z-z 0) along the z direction; the light is split into o and e in the crystal through the output light splitting/combining device 4, namely, each beam of incident light is split into two beams of linearly polarized light polarized along the x and y directions respectively; the polarization direction of the four beams of linearly polarized light rotates and rotates 45 degrees anticlockwise when the four beams of linearly polarized light enter the output optical rotation device 6; enters the lens 7 to form beam collimation and focusing; the polarization directions of the four beams of linearly polarized light rotate by 22.5 degrees clockwise after passing through a magneto-optical crystal 81 in the Faraday optical rotator 8; the light beam is focused on a reflecting surface 91 of the reflector 9, the light beam is reflected and returns to the magneto-optical crystal 81 in the Faraday rotator 8, the polarization directions of the four linearly polarized light beams are rotated, and the four linearly polarized light beams are rotated by 22.5 degrees clockwise; the light enters an input optical rotation device 5, the polarization direction of four beams of linearly polarized light rotates, and the rotation angle is 0 degree; so far, the total rotation angle of the four linearly polarized light beams is 0 degree, and then the four linearly polarized light beams enter the input light splitting/combining device 3, so that light combination cannot be realized; the input optical fiber 11 (x-x 1, z-z 0) and the input optical fiber 12 (x-x 1, z-z 0) have no light beam output.
As shown in fig. 14, in the present embodiment, splitting/combining of light beams is not generated in the y-z plane. A light beam is input from an input optical fiber 11(y 1, z0), focused by a lens 7 and reflected by a reflecting mirror 9, enters an output optical fiber 21(y 1, z zo) and is output; a light beam is input from an input optical fiber 12(y 1, z0), focused by a lens 7 and reflected by a mirror 9, and then output from an output optical fiber 22(y 1, z 0).
It is noted that variations and modifications of the embodiments disclosed herein are possible, and that alternatives and equivalents of the various components of the embodiments are known to those skilled in the art. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a unilateral optical isolator that goes out of fine which characterized in that: the optical fiber amplifier comprises an input optical fiber, an output optical fiber, an input light splitting/combining device, an output light splitting/combining device, an input optical rotation device, an output optical rotation device, a lens, a Faraday optical rotator and a reflector which are arranged in sequence; the end faces of the input optical fiber and the output optical fiber close to the lens are positioned in the same plane; the input light splitting/combining device and the input optical rotation device correspond to the input optical fiber and are sequentially fixed on the end face of the input optical fiber, which is close to the lens; the output light splitting/combining device and the output optical rotation device correspond to the output optical fiber and are sequentially fixed on the end face of the output optical fiber, which is close to the lens; two focal planes are arranged on two outer sides of the lens, the planes of the transmission end faces corresponding to the input optical fiber and the output optical fiber are positioned on one focal plane of the lens, and the reflecting surface of the reflector is positioned on the other focal plane of the lens;
when an incident beam is input from an input optical fiber, the incident beam is split by an input light splitting/combining device, enters an input optical rotation device for optical rotation, then enters a lens to form a collimated beam, then is optically rotated by a Faraday optical rotator, then enters a reflector for reflection, then returns to the Faraday optical rotator for optical rotation, then enters an output optical rotation device for optical rotation, then enters an output light splitting/combining device for light combination, and finally enters an output optical fiber for output;
when an incident beam is input from an output optical fiber, the incident beam is split by an output light splitting/combining device and then enters an output optical rotation device for optical rotation, then enters a lens to form a collimated beam, then is optically rotated by a Faraday optical rotator, then is incident to a reflector and then is reflected, so that the collimated beam returns to the Faraday optical rotator for optical rotation, then is incident to an input optical rotation device for optical rotation, then enters an input light splitting/combining device again, light combination cannot be realized, and output isolation is realized on an input optical fiber.
2. The single-side fiber-exiting optical isolator of claim 1, wherein: the number of the input optical fibers and the number of the output optical fibers are equal and are 2N, N is an integer more than 1, the input optical fibers and the output optical fibers are combined to form a porous optical fiber head or an optical fiber array, and the distribution combination between the input optical fibers and the output optical fibers is a central symmetrical structure.
3. The single-side fiber-exiting optical isolator of claim 2, wherein: the input light splitting/combining device and the output light splitting/combining device are both displacement type birefringent crystals and are used for splitting/combining o light and e light in the crystals; the optical axis of the birefringent crystal is oblique to the crystal surface, and the separation direction of the o light and the e light is vertical to the propagation direction of the light beam and parallel to the relative displacement direction of the input optical fiber and the output optical fiber.
4. The single-side fiber-exiting optical isolator of claim 3, wherein: the optical axis angles of the o light and the e light of the birefringent crystal are 45 degrees, and the separation distance of the o light and the e light is the largest under the condition that the thicknesses of the crystals are consistent.
5. The single-side fiber-exiting optical isolator of claim 3, wherein: the directions of the optical axes of the input light splitting/combining device and the output light splitting/combining device are consistent or mutually vertical; the input light splitting/combining device and the output light splitting/combining device are a plurality of independent devices which are in one-to-one correspondence with the input optical fibers or the output optical fibers or are combined into a whole.
6. The single-side fiber-exiting optical isolator of claim 1, wherein: the input optical rotation device and the output optical rotation device are 1/2 lambda phase delay type quartz wave plate crystals which are used for rotating the polarization direction of linearly polarized light; the optical axes of the input optical rotation device and the output optical rotation device are oblique to the surface of the crystal; and the input optical rotation device and the output optical rotation device are combined to realize that the total rotation angle of the linearly polarized light in the polarization direction is 45 degrees.
7. The single-side fiber-exiting optical isolator of claim 6, wherein: the optical rotation angle of the input optical rotation device is 0 degree, and the optical rotation angle of the output optical rotation device is 45 degrees; alternatively, the optical rotation angle of the input optical rotation device is 45 degrees, and the optical rotation angle of the output optical rotation device is 0 degree.
8. The single-side fiber-exiting optical isolator of claim 7, wherein: the rotation angle of the optical rotation device is 45 degrees, and the angle between the optical axis of the optical rotation device and the surface of the crystal is 67.5 degrees or 22.5 degrees; the rotation angle of the optical rotation device is 0 degree, and the angle between the optical axis and the surface of the crystal is 0 degree or 90 degrees.
9. The single-side fiber-exiting optical isolator of claim 1, wherein: the Faraday rotator is a combination of a magneto-optical crystal and a magnetic field device or an independent magneto-optical crystal; the magnetic field device is a permanent magnet, is a magnetic ring or a parallel flat plate made of magnetic materials and is used for providing the saturation magnetic field intensity of the magneto-optical crystal so that the magneto-optical crystal realizes fixed rotation of the polarization direction of linearly polarized light; the direction of the magnetic field is parallel to the direction of light propagation; when linearly polarized light is incident from the magnetic field N level of the magnetic field device, the polarization direction rotates clockwise; when linearly polarized light enters from the magnetic field S level, the polarization direction rotates anticlockwise;
the lens is a C lens or a lens with double-side focal planes and is used for focusing and collimating light beams;
the Faraday rotator is used for rotating the polarization direction of linearly polarized light, and the rotating angle of the Faraday rotator is 22.5 degrees;
the reflection is a glass flat sheet, and the reflection surface of the glass flat sheet is plated with a high-reflectivity film layer.
10. The single-side fiber-exiting optical isolator of claim 1, wherein: when the directions of the optical axes of the input light splitting/combining device and the output light splitting/combining device are consistent, the input optical rotation device, the output optical rotation device and the Faraday optical rotator are combined to realize that the total rotation angle of linearly polarized light in forward input is 90 degrees and the total rotation angle of linearly polarized light in reverse input is 0 degree; when the directions of the optical axes of the input light splitting/combining device and the output light splitting/combining device are mutually vertical, the input optical rotation device, the output optical rotation device and the Faraday optical rotator are combined to realize that the total rotation angle of linearly polarized light in forward input is 0 degree, and the total rotation angle of linearly polarized light in reverse input is 90 degrees.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113126210A (en) * | 2020-01-16 | 2021-07-16 | 福州高意通讯有限公司 | Unilateral fiber outlet optical isolator |
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| CN113126210A (en) * | 2020-01-16 | 2021-07-16 | 福州高意通讯有限公司 | Unilateral fiber outlet optical isolator |
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