CN108132500B - Closed loop optical circulator - Google Patents
Closed loop optical circulator Download PDFInfo
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- CN108132500B CN108132500B CN201810089486.9A CN201810089486A CN108132500B CN 108132500 B CN108132500 B CN 108132500B CN 201810089486 A CN201810089486 A CN 201810089486A CN 108132500 B CN108132500 B CN 108132500B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
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Abstract
The invention relates to a closed-loop optical circulator, which comprises a polarization beam splitter prism, a first collimator, a second collimator, a third collimator, a fourth collimator, a first displacement plate, a first rotating plate, a first wave, a second wave plate, a second displacement plate, a second rotating plate and a third wave plate, the first optical fiber, the second optical fiber, the third optical fiber and the fourth optical fiber are respectively arranged in a first collimator, a second collimator, a third collimator and a fourth collimator, the light beam of the first optical fiber is coupled into the second optical fiber, the light beam of the second optical fiber is coupled into the third optical fiber, the light beam of the third optical fiber is coupled into the fourth optical fiber, and the light beam of the fourth optical fiber is coupled into the first optical fiber to form a closed loop. The invention has reasonable structure and low production cost, and can realize the closed loop function which can not be realized by a common circulator.
Description
The technical field is as follows:
the invention relates to a closed-loop optical circulator.
Background art:
the optical circulator is a non-reciprocal optical device with multi-port input and output, and has the function of enabling optical signals to be transmitted only along a specified port sequence. Its typical structure has N (N is 3 or more) ports, and as shown in fig. 1, when light is input from port 1, light is output from port 2, when light is input from port 2, light is output from port 3, and so on.
Due to the sequential transmission characteristic of the optical circulator, the optical circulator becomes an important device in bidirectional communication, and can be used for separating forward transmission optical signals and reverse transmission optical signals in the same optical fiber. Fig. 2 is an example of an optical circulator used for single-fiber bidirectional communication. At this time, port 1 is connected to the data transmitter, port 2 is connected to the external network, and port 3 is connected to the signal receiver. Data can be sent from the transmitter to the external network through port 1 of the optical circulator through port 2, and external signals enter the optical circulator through port 2 but do not reach port 1 and reach port 3 to enter the signal receiver.
The optical circulator can be used for single-fiber bidirectional communication in optical communication, the combined application of Fiber Bragg Gratings (FBGs), an erbium-doped fiber amplifier (EDFA), Wavelength Division Multiplexing (WDM), dispersion compensation and optical signal uploading/downloading, and can also be used as a coupler in an Optical Time Domain Reflectometer (OTDR) and a fiber optic gyroscope (Sagnac interferometer), thereby well improving the performance of the system.
The invention content is as follows:
in view of the above, an object of the present invention is to provide a closed-loop optical circulator, which not only has a reasonable design, but also has the advantages of being closed-loop, high in isolation, low in insertion loss, low in polarization dependent loss, and the like.
In order to achieve the purpose, the invention adopts the technical scheme that: a closed-loop optical circulator comprises a first optical fiber, a second optical fiber, a third optical fiber, a fourth optical fiber, a polarization beam splitter prism, a first collimator, a second collimator, a third collimator and a fourth collimator, wherein the first collimator, the second collimator, the third collimator and the fourth collimator are distributed around the polarization beam splitter prism; a second displacement plate, a second rotating plate, a third wave plate and a fourth wave plate are sequentially arranged between the second collimator and the polarization beam splitter prism along the light incidence direction, and the abscissa of the third wave plate is the same as that of the fourth wave plate; a third displacement plate, a third rotating plate, a fifth wave plate and a sixth wave plate are sequentially arranged between the third collimator and the polarization beam splitter prism along the light incidence direction, and the vertical coordinates of the fifth wave plate and the sixth wave plate are the same; a fourth displacement plate, a fourth rotating plate, a seventh wave plate and an eighth wave plate are sequentially arranged between the fourth collimator and the polarization beam splitter prism along the light incidence direction, and the longitudinal coordinates of the seventh wave plate and the eighth wave plate are the same; the first optical fiber, the second optical fiber, the third optical fiber and the fourth optical fiber are respectively arranged on the first collimator, the second collimator, the third collimator and the fourth collimator, the light beam of the first optical fiber is coupled into the second optical fiber through the closed-loop optical circulator, the light beam of the second optical fiber is coupled into the third optical fiber through the closed-loop optical circulator, the light beam of the third optical fiber is coupled into the fourth optical fiber through the closed-loop optical circulator, and the light beam of the fourth optical fiber is coupled into the first optical fiber through the closed-loop optical circulator to form a closed-loop circuit.
Further, the first displacement plate, the second displacement plate, the third displacement plate and the fourth displacement plate are polarization splitting prisms.
Furthermore, any side of the polarization splitting prism is provided with 1/4, 3/4 or 5/4 wave plates which are arranged in the direction of the optical axis of 45 degrees or 135 degrees, so that the closed-loop three-port circulator is formed.
The invention also provides another closed-loop optical circulator: the optical fiber coupler comprises a first optical fiber, a second optical fiber, a third optical fiber, a fourth optical fiber, a first collimator, a first displacement plate, a first rotating plate, a first wave plate, a second wave plate, a polarization splitting prism, a fourth wave plate, a third wave plate, a second rotating plate, a second displacement plate and a second collimator which are sequentially arranged along the same transverse axis, wherein the polarization splitting prism is respectively provided with a first right-angle reflecting prism and a second right-angle reflecting prism along the two sides of the longitudinal axis; a fourth collimator is arranged beside the second collimator in parallel along a longitudinal axis, a fourth displacement plate, a fourth rotating plate, a seventh wave plate and an eighth wave plate are sequentially arranged between the fourth collimator and the second right-angle emission prism along the incident direction of light rays, and the abscissa of the third wave plate, the abscissa of the fourth wave plate, the abscissa of the seventh wave plate and the abscissa of the eighth wave plate are the same; the first optical fiber, the second optical fiber, the third optical fiber and the fourth optical fiber are respectively arranged on a first collimator, a second collimator, a third collimator and a fourth collimator; the light beam of the first optical fiber is coupled into a second optical fiber through the closed-loop optical circulator, the light beam of the second optical fiber is coupled into a third optical fiber through the closed-loop optical circulator, the light beam of the third optical fiber is coupled into a fourth optical fiber through the closed-loop optical circulator, and the light beam of the fourth optical fiber is coupled into the first optical fiber through the closed-loop optical circulator to form a closed-loop circuit.
Further, the first displacement plate, the second displacement plate, the third displacement plate and the fourth displacement plate are polarization splitting prisms.
Furthermore, the first displacement plate and the third displacement plate, the second displacement plate and the fourth displacement plate, the first rotating plate and the third rotating plate, the second rotating plate and the fourth rotating plate, the first wave plate and the second wave plate, the third wave plate and the fourth wave plate, the fifth wave plate and the sixth wave plate, the seventh wave plate and the eighth wave plate, the first collimator and the third collimator, and the second collimator and the fourth collimator are respectively of an integrated structure; the first right-angle reflecting prism, the second right-angle reflecting prism and the polarization beam splitting prism are of an integrated structure, and 1/2 wave plates in the direction of an optical axis of 45 degrees are placed on the first right-angle reflecting prism and the second right-angle reflecting prism.
Compared with the prior art, the invention has the following effects: the invention has reasonable design, adopts the polarization beam splitter prism, reuses optical parts on small space, simplifies the structure and reduces the cost. In the application of the circulator, the closed loop function which can not be realized by the common circulator is realized, and the circulator has the advantages which can not be compared by the common circulator in a special application environment.
Description of the drawings:
FIG. 1 is a schematic diagram of a conventional optical circulator;
FIG. 2 is a schematic diagram of an optical circulator for single-fiber bi-directional communication in the prior art;
FIG. 3 is a top view of an optical path according to a first embodiment of the present invention;
FIG. 4 is a side view of an incident light path according to a first embodiment of the present invention;
FIG. 5 is a side view of an exit light path according to a first embodiment of the present invention;
fig. 6 is a top view of a second "reflection- > transmission- > reflection- > transmission" optical path according to the embodiment of the present invention;
fig. 7 is a top view of an optical path of a triple-closed-loop triple-aperture circulator according to an embodiment of the invention;
FIG. 8 is a top view of a folded optical path of a closed-loop four-port circulator employing a single-fiber collimator according to a fourth embodiment of the present invention;
fig. 9 is a top view of a folded optical path of a closed-loop four-port circulator adopting a five-fiber collimator according to an embodiment of the present invention.
In the figure:
1-a port; 2-two ports; 3-three ports; 4-four ports; 11-a first optical fiber; 12-a second optical fiber; 13-a third optical fiber; 14-a fourth optical fiber; 21-a first collimator; 22-a second collimator; 23-a third collimator; 24-a fourth collimator; 31-a first displacement plate; 32-a second displacement sheet; 33-a third displacement sheet; 34-a fourth shift piece; 41-a first rotating plate; 42-second favorite film; 43-a third rotating plate; 44-a fourth rotating plate; 51-a first wave plate; 52-a second wave plate; 53-third wave plate; 54-a fourth wave plate; 55-a fifth wave plate; 56-sixth wave plate; 57-seventh wave plate; 58-eighth wave plate; 6-polarization beam splitter prism; 7-1/4 wave plates; 81-a first right angle reflecting prism; 82-second right angle reflecting prism.
The specific implementation mode is as follows:
in order to explain the invention more clearly, the invention will be further explained below with reference to the attached drawings and examples, it being apparent that the drawings listed below are only some specific examples of the invention.
The first embodiment is as follows:
as shown in fig. 3, in this embodiment, a closed-loop optical circulator includes a first optical fiber 11, a second optical fiber 12, a third optical fiber 13, a fourth optical fiber 14, a polarization beam splitter 6, and a first collimator 21, a second collimator 22, a third collimator 23, and a fourth collimator 24 distributed around the polarization beam splitter 6, where the first collimator 21 and the second collimator 22 are disposed opposite along a transverse axis, the third collimator 23 and the fourth collimator 24 are disposed opposite along a longitudinal axis, the first optical fiber 11, the second optical fiber 12, the third optical fiber 13, and the fourth optical fiber 14 are respectively disposed on the first collimator 21, the second collimator 22, the third collimator 23, and the fourth collimator 24, the first collimator 21, the second collimator 22, the third collimator 23, and the fourth collimator 24 collimate light from the first optical fiber 11, the second optical fiber 12, the third optical fiber 13, and the fourth optical fiber 14 into parallel light beams, or to direct parallel light beams into the first optical fiber 11, the second optical fiber 12, the third optical fiber 13 and the fourth optical fiber 14.
A first displacement plate 31, a first rotating plate 41, a first wave plate 51 and a second wave plate 52 are sequentially arranged between the first collimator 21 and the polarization beam splitter prism 6 along the incident direction of light rays, and the abscissa of the first wave plate 51 is the same as that of the second wave plate 52; a second displacement plate 32, a second rotating plate 42, a third wave plate 53 and a fourth wave plate 54 are sequentially arranged between the second collimator 21 and the polarization splitting prism 6 along the light incidence direction, and the abscissa of the third wave plate 53 is the same as that of the fourth wave plate 54; a third displacement plate 33, a third rotating plate 43, a fifth wave plate 55 and a sixth wave plate 56 are sequentially arranged between the third collimator 23 and the polarization beam splitter prism 6 along the light incidence direction, and the vertical coordinates of the fifth wave plate 55 and the sixth wave plate 56 are the same; a fourth displacement plate 34, a fourth rotating plate 44, a seventh wave plate 57 and an eighth wave plate 58 are sequentially arranged between the fourth collimator 24 and the polarization splitting prism 6 along the light incidence direction, and the ordinate of the seventh wave plate 57 is the same as that of the eighth wave plate 58; the first, second, third and fourth displacement plates 31, 32, 33 and 34 are used to split an input light in an arbitrary state into two polarization components with orthogonal polarization directions or to combine the two polarization components with orthogonal polarization directions into one light beam. The first rotating plate 41, the second rotating plate 42, the third rotating plate 43, the fourth rotating plate 44, the first wave plate 51, the second wave plate 52, the third wave plate 53, the fourth wave plate 54, the fifth wave plate 55, the sixth wave plate 56, the seventh wave plate 57, and the eighth wave plate 58 are used for changing the polarization state of the light beam. And the polarization beam splitting prism 6 generates transmission directions of transmission and reflection according to the polarization state of the light beam.
The light incident from the first optical fiber 11 is horizontally polarized after passing through the first collimator 21, the first displacement plate 31, the first rotation plate 41, the first wave plate 51, and the second wave plate 52, is transmitted on the polarization splitting prism 6, and then is coupled into the second optical fiber 12 through the third wave plate 53, the fourth wave plate 54, the second rotation plate 42, the second displacement plate 32, and the second collimator 22. The light incident from the second optical fiber 12 is vertically polarized after passing through the second collimator 22, the second displacement plate 32, the second rotation plate 42, the third wave plate 53 and the fourth wave plate 54, is reflected by the polarization splitting prism 6, and then is coupled into the third optical fiber 13 after passing through the sixth wave plate 56, the fifth wave plate 55, the third rotation plate 43, the third displacement plate 33 and the third collimator 23. The light incident from the third optical fiber 13 is horizontally polarized after passing through the third collimator 23, the third displacement plate 33, the third rotation plate 43, the fifth wave plate 55 and the sixth wave plate 56, is transmitted on the polarization splitting prism 6, and is then coupled into the fourth optical fiber 14 through the eighth wave plate 58, the seventh wave plate 57, the fourth rotation plate 44, the fourth displacement plate 34 and the fourth collimator 24. The light incident from the fourth optical fiber 14 is vertically polarized after passing through the fourth collimator 24, the fourth displacement plate 34, the fourth rotation plate 44, the seventh wave plate 57 and the eighth wave plate 58, is reflected by the polarization splitting prism 6, and then is coupled into the first optical fiber 11 through the second wave plate 52, the first wave plate 51, the first rotation plate 41, the first displacement plate 31 and the first collimator 21, thereby forming a closed loop. The transmission- > reflection- > transmission- > reflection is performed on the polarization beam splitter prism 5 from the first, second, third and fourth orders.
To illustrate the polarization change of the incident light in this embodiment, as shown in fig. 4, a first optical fiber 11 is taken as an example: the light beam from the first optical fiber 11 passes through the first collimator 21 and becomes a parallel light beam 211, and the light beam 211 enters the first shifter and is split into two light beams separated in the x direction with mutually perpendicular polarization states, i.e., normal light 211o in the horizontal polarization direction and abnormal light 211e in the vertical polarization state. The xy-plane cross-sectional view below fig. 4 indicates their polarization state. The polarization of the light beam 211o is rotated by-45 ° after passing through the first wave plate 51 with an optical axis of-22.5 °, and the polarization of the light beam 211e is rotated by 45 ° after passing through the second wave plate 52 with an optical axis of 22.5 °, so that the polarization directions of the light beams 211o and 211e are the same, and the xy-plane cross-sectional view at the bottom of fig. 3 indicates the change of the polarization states of the light beams 211o and 211 e. Then the two beams of light enter a polarization beam splitter prism 6, the polarization direction rotates anticlockwise by-45 degrees, at the moment, the two beams of light are emitted in a vertical polarization state, and the polarization direction is along the direction of an x axis.
To illustrate the polarization change of the emergent light in this embodiment, as shown in fig. 5, a first optical fiber 11 is taken as an example: the two light beams 211o 'and 211 e' transmitted from the left side of the figure are in a horizontal polarization state, and the polarization direction is along the y-axis direction. The two beams of light pass through the polarization beam splitter prism 6, the polarization direction rotates anticlockwise by-45 °, and then the polarization state of the light beam 211 o' is rotated by 45 ° after passing through the first wave plate 51 with the optical axis of-22.5 ° to become horizontal polarized light; after the light beam 211 e' passes through the second wave plate 52 with an optical axis of 22.5 °, the polarization state is rotated by-45 ° to become vertically polarized light. The horizontally polarized light beam 211o ' and the vertically polarized light beam 211e ' enter the first displacement plate 31 and are combined into a parallel light beam 211 '. The xy-plane cross-sectional view below fig. 4 indicates their polarization state. The light beam 211' enters the first optical fiber 11 from the first collimator 21.
In the above fig. 4 and 5, the polarization state changes from right to left transmission and from left to right transmission are illustrated, explaining the effect that the incident light generates the vertical polarization state and the emergent light is the horizontal polarization state. Similarly, if the optical axis of the wave plate is changed at plus or minus 22.5 degrees, or the light selecting plate is changed at plus or minus 45 degrees, the effect that the incident light generates the horizontal polarization state and the emergent light generates the vertical polarization state can also occur.
In this embodiment, the first displacement plate 31, the second displacement plate 32, the third displacement plate 33, and the fourth displacement plate 34 are polarization splitting prisms, and achieve the same light splitting and combining function. Under the condition of using the polarization beam splitter prism, the optical path length can be compressed, and the cost is reduced.
In the present embodiment, the order of the first rotating plate 41 and the first wave plate 51, the order of the second wave plate 52, the order of the second rotating plate 42 and the third wave plate 53, the order of the fourth wave plate 54, the order of the third rotating plate 43 and the fifth wave plate 55, the order of the sixth wave plate 56, the order of the fourth rotating plate 44 and the seventh wave plate 57, and the order of the eighth wave plate 58 may be interchanged.
In this embodiment, the positions of the first optical fiber 11, the second optical fiber 12, the third optical fiber 13 and the fourth optical fiber 14 are defined as a port 1, a port 2, a port 3 and a port 4 in sequence. Being a closed loop circulator, each port is peer-to-peer and reciprocal. Aiming at the fact that a polarization beam splitter prism has two transmission directions of transmission and reflection, a first port, a second port, a third port and a fourth port are sequentially arranged in a crossed mode to be output in a vertical polarization mode and a horizontal polarization mode; the outgoing direction generated by the optical rotation sheet with the irreversible magnetic rotation effect and the reversible optical rotation wave plate is the vertical polarization direction or the horizontal polarization direction, and the corresponding input direction is determined to be the horizontal polarization direction or the vertical polarization direction. Then on the polarization beam splitter prism, a transmission-reflection staggered distribution layout can be formed, thereby generating the effect of a closed-loop circulator with one, two, three and four ports,
after the light from each optical fiber is collimated into parallel beams by the corresponding collimator, the beams sequentially pass through the displacement plate, the rotating plate and the two wave plates, and the transmission direction of the beams is not changed; after the light beam is incident to the polarization beam splitter prism, the polarized light parallel to the polarization beam splitter prism is reflected, the polarized light vertical to the polarization beam splitter prism is transmitted, and the transmission direction of the light beam is changed; the incident light passes through the two wave plates, the rotating plate and the displacement plate of the other circulator arm and is received by the corresponding optical fiber.
Example two:
referring to fig. 6, it is a top view of an optical path according to a second embodiment of the present invention, where the difference between the second embodiment and the first embodiment is that the direction of the wave plate is adjusted, so that the light beam of the first optical fiber is incident on the polarization beam splitter prism and is vertically polarized light, and then is reflected, thereby implementing the optical path distribution according to fig. 6.
Example three:
the difference between this embodiment and the first embodiment is: any side of the polarization beam splitter prism 6 is provided with 1/4, 3/4 or 5/4 wave plates which are arranged in the direction of an optical axis of 45 degrees or 135 degrees, so that the closed-loop three-port circulator is formed. As shown in fig. 7, the fourth collimator, the fourth displacement plate 34, the fourth rotation plate 44, the seventh wave plate 57, and the eighth wave plate 58 are replaced by 1/4 wave plates 7 disposed with an optical axis of 45 °, in which case, the incident light is in a horizontal polarization state and the emergent light is in a vertical polarization state; if the incident light is in a vertical polarization state, the emergent light is changed into a horizontal polarization state. Then the light from the third optical fiber 13 to the original fourth optical fiber 14 is directly reflected back to the optical path, and then reflected by the polarization beam splitter prism 6 to enter the first optical fiber 11, thus forming the condition of closed loop three-port. Without the 1/4 wave plate, the entire structure is a conventional three-port circulator.
Example four:
in this embodiment, another closed-loop optical circulator is also provided: as shown in fig. 8, the optical fiber comprises a first optical fiber 11, a second optical fiber 12, a third optical fiber 13, a fourth optical fiber 14, a first collimator 21, a first displacement plate 31, a first rotating plate 41, a first wave plate 54, a second wave plate 52, a polarization splitting prism 6, a fourth wave plate 54, a third wave plate 53, a second rotating plate 42, a second displacement plate 32, and a second collimator 22, which are sequentially arranged along the same horizontal axis, wherein the polarization splitting prism 6 is respectively provided with a first right-angle reflecting prism 81 and a second right-angle reflecting prism 82 along the two sides of the vertical axis, the side of the first collimator 21 is provided with a third collimator 23 side by side along the vertical axis, a third displacement plate 33, a third rotating plate 43, a fifth wave plate 55, a sixth wave plate 56, a first wave plate 51, a second wave plate 52, a third wave plate 52, a second wave plate 42, a second displacement plate 32, and a second displacement plate 32 are sequentially arranged between the third collimator 23 and the first right-angle reflecting prism 81 along, The abscissa of the fifth wave plate 55 is the same as that of the sixth wave plate 56; a fourth collimator 24 is arranged beside the second collimator 22 side by side along a longitudinal axis, a fourth displacement plate 34, a fourth rotating plate 44, a seventh wave plate 57 and an eighth wave plate 58 are sequentially arranged between the fourth collimator 24 and the second right-angle emission prism 82 along a light incidence direction, and the abscissa of the third wave plate 53, the abscissa of the fourth wave plate 54, the abscissa of the seventh wave plate 57 and the abscissa of the eighth wave plate 58 are the same; the first optical fiber 11, the second optical fiber 12, the third optical fiber 13 and the fourth optical fiber 14 are respectively placed on a first collimator 21, a second collimator 22, a third collimator 23 and a fourth collimator 24; the light beam of the first optical fiber 11 is coupled into the second optical fiber 12 through the closed-loop optical circulator, the light beam of the second optical fiber 12 is coupled into the third optical fiber 13 through the closed-loop optical circulator, the light beam of the third optical fiber 13 is coupled into the fourth optical fiber 14 through the closed-loop optical circulator, and the light beam of the fourth optical fiber 14 is coupled into the first optical fiber 11 through the closed-loop optical circulator to form a closed-loop circuit.
In this embodiment, the first collimator 21, the second collimator 22, the third collimator 23, and the fourth collimator 24 are single fiber collimators, and the third optical fiber 13 and the fourth optical fiber 14 in the first embodiment are respectively folded in the left and right directions by using the first right-angle reflecting prism 81 and the second right-angle reflecting prism 82, which is more compact than the first embodiment. Meanwhile, the first right-angle reflecting prism 81 and the second right-angle reflecting prism 82 may also be replaced with mirrors; other directions of folding the optical path may also be used.
In this embodiment, the first displacement plate 31, the second displacement plate 32, the third displacement plate 33, and the fourth displacement plate 34 are polarization splitting prisms, and achieve the same light splitting and combining function. Under the condition of using the polarization beam splitter prism, the optical path length can be compressed, and the cost is reduced.
Example five:
as shown in fig. 9, the present embodiment is different from the fourth embodiment in that: the first displacement plate 31 and the third displacement plate 33, the second displacement plate 32 and the fourth displacement plate 34, the first rotation plate 41 and the third rotation plate 43, the second rotation plate 42 and the fourth rotation plate 44, the first wave plate 51 and the second wave plate 52, the third wave plate 53 and the fourth wave plate 54, the fifth wave plate 55 and the sixth wave plate 56, the seventh wave plate 57 and the eighth wave plate 58, the first collimator 21 and the third collimator 23, and the second collimator 22 and the fourth collimator 24 are respectively of an integrated structure; the first right-angle reflecting prism 81, the second right-angle reflecting prism 82 and the polarization splitting prism 6 are of an integrated structure, and 1/2 wave plates in the direction of the optical axis of 45 degrees are placed on the first right-angle reflecting prism 81 and the second right-angle reflecting prism 82.
The first collimator 21 and the third collimator 23, and the second collimator 22 and the fourth collimator 24 are respectively of an integrated structure, so that a double-fiber collimator can be formed, at the moment, the first optical fiber 11 and the third optical fiber 13 are combined into the same collimator, and the second optical fiber 12 and the fourth optical fiber 14 are combined into the same collimator, so that the closed-loop optical circulator is simpler in structure, greatly reduced in cost, and capable of being put into practical use and being produced in mass.
The above-mentioned preferred embodiments, further illustrating the objects, technical solutions and advantages of the present invention, should be understood that the above-mentioned are only preferred embodiments of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The utility model provides a closed loop optical circulator, includes first optic fibre, the second optic fibre, third optic fibre and fourth optic fibre, its characterized in that: the polarization beam splitter comprises a polarization beam splitter prism, a first collimator, a second collimator, a third collimator and a fourth collimator which are distributed around the polarization beam splitter prism, wherein the first collimator and the second collimator are arranged oppositely along a transverse axis, the third collimator and the fourth collimator are arranged oppositely along a longitudinal axis, a first displacement plate, a first rotating plate, a first wave plate and a second wave plate are sequentially arranged between the first collimator and the polarization beam splitter prism along a light incidence direction, and the transverse coordinates of the first wave plate and the second wave plate are the same; a second displacement plate, a second rotating plate, a third wave plate and a fourth wave plate are sequentially arranged between the second collimator and the polarization beam splitter prism along the light incidence direction, and the abscissa of the third wave plate is the same as that of the fourth wave plate; a third displacement plate, a third rotating plate, a fifth wave plate and a sixth wave plate are sequentially arranged between the third collimator and the polarization beam splitter prism along the light incidence direction, and the vertical coordinates of the fifth wave plate and the sixth wave plate are the same; a fourth displacement plate, a fourth rotating plate, a seventh wave plate and an eighth wave plate are sequentially arranged between the fourth collimator and the polarization beam splitter prism along the light incidence direction, and the longitudinal coordinates of the seventh wave plate and the eighth wave plate are the same; the first optical fiber, the second optical fiber, the third optical fiber and the fourth optical fiber are respectively arranged on the first collimator, the second collimator, the third collimator and the fourth collimator, the light beam of the first optical fiber is coupled into the second optical fiber through the closed-loop optical circulator, the light beam of the second optical fiber is coupled into the third optical fiber through the closed-loop optical circulator, the light beam of the third optical fiber is coupled into the fourth optical fiber through the closed-loop optical circulator, and the light beam of the fourth optical fiber is coupled into the first optical fiber through the closed-loop optical circulator to form a closed-loop circuit.
2. The closed loop optical circulator of claim 1, wherein: the first displacement plate, the second displacement plate, the third displacement plate and the fourth displacement plate are polarization splitting prisms.
3. The utility model provides a closed loop optical circulator, includes first optic fibre, the second optic fibre, third optic fibre and fourth optic fibre, its characterized in that: the polarization splitting prism is provided with a first right-angle reflecting prism and a second right-angle reflecting prism along the two sides of the longitudinal axis respectively, the side of the first collimator is provided with a third collimator side by side along the longitudinal axis, a third displacement plate, a third rotating plate, a fifth wave plate and a sixth wave plate are sequentially arranged between the third collimator and the first right-angle reflecting prism along the incident direction of light, and the transverse coordinates of the first wave plate, the second wave plate, the fifth wave plate and the sixth wave plate are the same; a fourth collimator is arranged beside the second collimator in parallel along a longitudinal axis, a fourth displacement plate, a fourth rotating plate, a seventh wave plate and an eighth wave plate are sequentially arranged between the fourth collimator and the second right-angle emission prism along the incident direction of light rays, and the abscissa of the third wave plate, the abscissa of the fourth wave plate, the abscissa of the seventh wave plate and the abscissa of the eighth wave plate are the same; the first optical fiber, the second optical fiber, the third optical fiber and the fourth optical fiber are respectively arranged on a first collimator, a second collimator, a third collimator and a fourth collimator; the light beam of the first optical fiber is coupled into a second optical fiber through the closed-loop optical circulator, the light beam of the second optical fiber is coupled into a third optical fiber through the closed-loop optical circulator, the light beam of the third optical fiber is coupled into a fourth optical fiber through the closed-loop optical circulator, and the light beam of the fourth optical fiber is coupled into the first optical fiber through the closed-loop optical circulator to form a closed-loop circuit.
4. The closed loop optical circulator of claim 3, wherein: the first displacement plate, the second displacement plate, the third displacement plate and the fourth displacement plate are polarization splitting prisms.
5. The closed loop optical circulator of claim 3, wherein: the first displacement plate and the third displacement plate, the second displacement plate and the fourth displacement plate, the first rotating plate and the third rotating plate, the second rotating plate and the fourth rotating plate, the first wave plate and the second wave plate, the third wave plate and the fourth wave plate, the fifth wave plate and the sixth wave plate, the seventh wave plate and the eighth wave plate, the first collimator and the third collimator, and the second collimator and the fourth collimator are respectively of an integrated structure; the first right-angle reflecting prism, the second right-angle reflecting prism and the polarization beam splitting prism are of an integrated structure, and 1/2 wave plates in the direction of an optical axis of 45 degrees are placed on the first right-angle reflecting prism and the second right-angle reflecting prism.
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| CN201810089486.9A CN108132500B (en) | 2018-01-30 | 2018-01-30 | Closed loop optical circulator |
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| CN201810089486.9A CN108132500B (en) | 2018-01-30 | 2018-01-30 | Closed loop optical circulator |
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| CN111025668B (en) * | 2019-12-30 | 2023-04-25 | 珠海光库科技股份有限公司 | Optical device integrating polarization coherent beam splitting |
| CN114397760B (en) * | 2021-12-31 | 2023-09-12 | 昂纳科技(深圳)集团股份有限公司 | Wave-combining circulator assembly and circulator |
| CN115963602A (en) * | 2022-12-26 | 2023-04-14 | 武汉灵途传感科技有限公司 | Polarization-maintaining optical fiber circulator |
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| CN102207586A (en) * | 2011-05-20 | 2011-10-05 | 深圳市天阳谷科技发展有限公司 | Four-port optical directional router |
| CN103076655A (en) * | 2013-01-17 | 2013-05-01 | 珠海保税区光联通讯技术有限公司 | Adjustable optical attenuator wavelength division multiplexer |
| CN103424896A (en) * | 2013-09-02 | 2013-12-04 | 珠海保税区光联通讯技术有限公司 | Optical path control device |
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| JP4448721B2 (en) * | 2004-03-29 | 2010-04-14 | 富士通株式会社 | Wavelength demultiplexing unit |
| TWI372270B (en) * | 2009-05-04 | 2012-09-11 | Ind Tech Res Inst | Optical switch and communication system of optical signal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102207586A (en) * | 2011-05-20 | 2011-10-05 | 深圳市天阳谷科技发展有限公司 | Four-port optical directional router |
| CN103076655A (en) * | 2013-01-17 | 2013-05-01 | 珠海保税区光联通讯技术有限公司 | Adjustable optical attenuator wavelength division multiplexer |
| CN103424896A (en) * | 2013-09-02 | 2013-12-04 | 珠海保税区光联通讯技术有限公司 | Optical path control device |
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