CN113126211B - A high isolation optical splitter - Google Patents
A high isolation optical splitter Download PDFInfo
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- CN113126211B CN113126211B CN202010047495.9A CN202010047495A CN113126211B CN 113126211 B CN113126211 B CN 113126211B CN 202010047495 A CN202010047495 A CN 202010047495A CN 113126211 B CN113126211 B CN 113126211B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 243
- 238000002955 isolation Methods 0.000 title claims abstract description 29
- 239000013307 optical fiber Substances 0.000 claims abstract description 180
- 230000010287 polarization Effects 0.000 claims description 46
- 239000013078 crystal Substances 0.000 claims description 36
- 239000000835 fiber Substances 0.000 claims description 18
- 239000011521 glass Substances 0.000 claims description 4
- 239000010453 quartz Substances 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 2
- 230000009977 dual effect Effects 0.000 claims 2
- 238000004891 communication Methods 0.000 abstract description 5
- 238000013461 design Methods 0.000 abstract description 2
- 238000011161 development Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract description 2
- 230000010354 integration Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 238000000926 separation method Methods 0.000 description 4
- 230000003321 amplification Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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Classifications
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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
- 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
- G02B6/2706—Optical coupling means with polarisation selective and adjusting means as bulk elements, i.e. free space arrangements external to a light guide, e.g. polarising beam splitters
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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
- G02B6/2746—Optical coupling means with polarisation selective and adjusting means comprising non-reciprocal devices, e.g. isolators, FRM, circulators, quasi-isolators
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Abstract
本发明提供一种用于光通信领域内的高隔离度分光器。该高隔离度分光器包括了输入光纤、第一输出光纤、输入分光/合光装置、第一输出分光/合光装置、输入旋光装置、第一输出旋光装置、第一透镜、隔离器芯、第二透镜、第二输出旋光装置、第二输出分光/合光装置、第二输出光纤。通过采用集成化结构设计，该高隔离度分光器实现了光隔离器和分光器的功能集成，既能实现光信号从一根输入光纤输入，分配到两根输出光纤输出，又能实现反向光隔离，减小其对输入端光源的损害。在系统应用中，采用单个高隔离度分光器替代传统两个独立的光隔离器和分光器，可以有效减小组装空间，降低组装难度，简化组装工艺，有利于系统小型化、集成化的应用发展。
The present invention provides a high-isolation optical splitter for use in the field of optical communications. The high-isolation optical splitter includes an input optical fiber, a first output optical fiber, an input light splitting/combining device, a first output light splitting/combining device, an input optical rotation device, a first output optical rotation device, a first lens, an isolator core, a second lens, a second output optical rotation device, a second output light splitting/combining device, and a second output optical fiber. By adopting an integrated structural design, the high-isolation optical splitter realizes the functional integration of an optical isolator and a light splitter, which can not only realize the input of an optical signal from an input optical fiber and the distribution to two output optical fibers for output, but also realize reverse optical isolation, thereby reducing the damage to the input end light source. In system applications, a single high-isolation optical splitter is used to replace two traditional independent optical isolators and optical splitters, which can effectively reduce the assembly space, reduce the difficulty of assembly, simplify the assembly process, and is conducive to the development of system miniaturization and integrated applications.
Description
The invention relates to the field of optical fiber communication, in particular to a high-isolation optical splitter applied to an optical amplifier system.
Background
In an optical fiber communication system, the optical isolator can effectively reduce the interference of reverse light on a transmission line to a laser due to the unidirectional transmission performance, lighten the deterioration of the transmission performance of the system, reduce the gain change of an optical amplifier and the probability of self-excitation, maintain the working stability of the laser, prolong the service life of the laser and be an important passive optical device widely applied to the optical fiber communication system. Optical splitters are another type of passive optical device that can distribute optical signals from one link to multiple links, and are also widely used in optical fiber communication systems. In particular, in optical amplifier systems, optical isolators and optical splitters are often used in combination for reverse optical isolation and power splitting after signal amplification.
The optical isolator and the optical splitter which are conventionally applied to the optical amplification system are two independent devices, so that the required assembly space is large, the assembly cost is high, and a certain assembly risk is provided.
In view of the situation in the prior art, the invention aims to provide a high-isolation optical splitter, which integrates functions of a traditional optical isolator and an optical splitter by one device.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the high-isolation optical splitter comprises an input optical fiber, a first output optical fiber, an input light splitting/combining device, a first output light splitting/combining device, an input optical rotation device, a first output optical rotation device, a first lens, an isolator core, a second lens, a second output optical rotation device, a second output light splitting/combining device and a second output optical fiber which are sequentially arranged;
The input light splitting/combining device and the input optical rotation device correspond to the input optical fiber and are sequentially arranged between the end face, close to the first lens, of the input optical fiber and the first lens; the first output light splitting/combining device and the first output optical rotation device correspond to the first output optical fiber and are sequentially arranged between the end face of the first output optical fiber, which is close to the first lens, and the first lens;
In addition, the isolator core comprises a first Faraday rotator, a light splitting sheet, a second Faraday rotator and a magnetic ring which is sleeved with the first Faraday rotator, the light splitting sheet and the second Faraday rotator in sequence, wherein the open ends at two ends of the magnetic ring are respectively opposite to the first lens and the second lens;
when an incident light beam is input from the input optical fiber, light splitting is generated through the light splitting sheet in the isolator core, reflected light is output from the first output optical fiber, transmitted light is output from the second output optical fiber, when the incident light beam is input from the first output optical fiber, the input optical fiber is isolated from the light beam on the second output optical fiber, and when the incident light beam is input from the second output optical fiber, the input optical fiber is isolated from the light beam on the first output optical fiber.
As a possible implementation manner, the first output optical fiber and the input optical fiber are combined to form a double-fiber optical fiber head structure, the first output optical fiber and the input optical fiber are symmetrical along a virtual center axis of the double-fiber optical head, and the second output optical fiber and the first output optical fiber are positioned on the same side of the virtual center axis.
Preferably, the second output optical fiber is one optical fiber of a double-fiber optical fiber head, and the hole spacing of the double-fiber optical fiber head is consistent with that of the double-fiber optical fiber head formed by the first output optical fiber and the input optical fiber.
The input optical splitting/combining device and the input optical rotation device are corresponding to the input optical fiber and are sequentially arranged on the end face, close to the first lens, of the input optical fiber, the first output optical splitting/combining device and the first output optical rotation device are corresponding to the first output optical fiber and are sequentially arranged on the end face, close to the first lens, of the first output optical fiber, the second optical splitting/combining device and the second optical rotation device are corresponding to the second output optical fiber and are sequentially arranged on the end face, close to the second lens, of the second output optical fiber, in short, the input optical splitting/combining device is fixed on the input optical fiber, the input optical rotation device is fixed on the input optical splitting/combining device, the first output optical splitting/combining device is fixed on the first output optical fiber, the first output optical splitting/combining device is fixed on the first output optical splitting/combining device, the second output optical splitting/combining device is fixed on the second output optical fiber, and the second optical rotation device is fixed on the second output optical splitting/combining device.
Optionally, the input light splitting/combining device is consistent with the first output light splitting/combining device and the second output light splitting/combining device in size.
The light splitting/combining device is a displacement type double refraction crystal and is used for realizing light splitting/combining of o light and e light in the crystal, the optical axis of the double refraction crystal is obliquely crossed with the surface of the crystal, the angle is 45 degrees, the separation direction of the o light and the e light is perpendicular to the light beam propagation direction, and the separation direction of the o light and the e light is parallel to the relative displacement direction of the input optical fiber and the output optical fiber.
The optical rotation angle realized by the combination of the input optical rotation device, the first output optical rotation device and the first Faraday rotator is 90 degrees when the input optical rotation device is parallel to the optical axis direction of the first output optical rotation device, the optical rotation angle realized by the combination of the input optical rotation device, the first output optical rotation device and the first Faraday rotator is 0 degrees when the input optical rotation device is perpendicular to the optical axis direction of the first output optical rotation device, the optical rotation angle realized by the combination of the input optical rotation device, the second output optical rotation device and the second Faraday rotator is 0 degrees when the input optical rotation device is parallel to the optical axis direction of the second output optical rotation device, and the optical rotation angle realized by the combination of the input optical rotation device, the second output optical rotation device and the second Faraday rotator is 90 degrees when the input optical rotation device is parallel to the optical axis direction of the second output optical rotation device.
Further, the optical rotation device is a 1/2 lambda phase delay type quartz wave plate crystal used for rotating the polarization direction of linearly polarized light, the optical rotation angle realized by the combination of the input optical rotation device and the first output optical rotation device is 45 degrees, and the optical rotation angle realized by the combination of the input optical rotation device and the second output optical rotation device is 45 degrees.
Optionally, the input optical rotation device, the first output optical rotation device, and the second output optical rotation device are uniform in size.
Further, the first lens and the second lens are in the form of a C lens or other lenses with double focal planes for focusing and collimating the light beams, the input optical fiber and the first output optical fiber are positioned at one focal plane of the first lens, the light splitting surface of the light splitting sheet is positioned at the other focal plane of the first lens, the second output optical fiber is positioned at one focal plane of the second lens, and the light splitting surface of the light splitting sheet is positioned at the other focal plane of the second lens.
Optionally, the collimated light spots of the first lens and the second lens are identical.
Optionally, the first lens and the second lens are consistent in size and material.
Further, the first faraday rotator and the second faraday rotator are magneto-optical crystals, and the rotation angle of the polarization direction of linearly polarized light is 22.5 degrees.
Optionally, the first faraday rotator and the second faraday rotator are uniform in size.
Further, the magnetic ring is a permanent magnet 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, and the magnetic field direction is parallel to the light propagation direction.
Alternatively, the polarization direction is rotated clockwise when the linearly polarized light is incident from the magnetic field N-order, and rotated counterclockwise when the linearly polarized light is incident from the magnetic field S-order.
Further, the light splitting sheet is a glass flat sheet with a certain thickness, and the light splitting surface is plated with a light splitting power TAP film or a light splitting wavelength WDM film.
Compared with the prior art, the integrated optical isolator has the beneficial effects that the integrated optical isolator has the integrated structure design, so that the functions of the optical isolator and the optical splitter are unified in one device, the assembly space is reduced, the assembly difficulty is reduced, the assembly process is simplified, and the miniaturized and integrated application development of the system is facilitated.
The invention is further illustrated by the following description in conjunction with the accompanying drawings and detailed description:
FIG. 1 is a three-dimensional schematic diagram of the overall structure of embodiments 1, 2 of the high isolation beam splitter of the present invention;
FIG. 2 is a three-dimensional schematic diagram of the isolator core of embodiments 1, 2 of the high isolation beam splitter of the present invention;
FIG. 3 is a front view and a right side view of the assembly structure of the reflective end of the embodiment 1 of the high isolation beam splitter of the present invention;
FIG. 4 is a front view and a left side view of the transmission end assembly structure of embodiment 1 of the high isolation beam splitter of the present invention;
FIG. 5 is a schematic diagram of a forward optical path of embodiment 1 of the high isolation beam splitter of the present invention;
FIG. 6 is a schematic diagram of a reverse optical path of an embodiment 1 of a high isolation beam splitter according to the present invention;
FIG. 7 is a front view and a right side view of the assembly structure of the reflective end of embodiment 2 of the high isolation beam splitter of the present invention;
FIG. 8 is a front view and a left side view of the transmission end assembly structure of embodiment 2 of the high isolation beam splitter of the present invention;
FIG. 9 is a schematic diagram of a forward optical path of embodiment 2 of the high isolation beam splitter of the present invention;
fig. 10 is a schematic diagram of a reverse optical path of embodiment 2 of the high isolation beam splitter of the present invention.
Detailed Description
Example 1
As shown in fig. 1 and 2, the structure of the present embodiment includes an input optical fiber 1, a first output optical fiber 2, an input light splitting/combining device 3, a first output light splitting/combining device 4, an input optical rotation device 5, a first output optical rotation device 6, a first lens 7, an isolator core 8, a second lens 9, a second output optical rotation device 10, a second output light splitting/combining device 11, and a second output optical fiber 12, wherein the isolator core 8 includes a first faraday rotator 801, a light splitting sheet 802, a second faraday rotator 803, and a magnetic ring 804 arranged in this order, when an incident light beam is input from the input optical fiber 1, light splitting is generated through the light splitting sheet 802 in the isolator core 8, reflected light is output from the first output optical fiber 2, transmitted light is output from the second output optical fiber 12, when the incident light beam is input from the first output optical fiber 2, light beam is isolated from the input optical fiber 1 and the second output optical fiber 12, and when the incident light beam is input from the second output optical fiber 12, light beam is isolated from the input optical fiber 1 and the first output optical fiber 2.
As shown in FIG. 1, the first output optical fiber 2 and the input optical fiber 1 are combined into a double-fiber optical fiber head, the double-fiber optical fiber head is positioned on the same side of the device, the second output optical fiber 12 is positioned on the other side of the device, the first output optical fiber 2 and the input optical fiber 1 are symmetrical about the central axis of the double-fiber optical head, and the second output optical fiber 12 and the input optical fiber 1 are positioned on two sides of the central axis of the device and are positioned on the same side of the central axis of the device as the first output optical fiber 2.
As shown in fig. 3 and 4, the input spectroscopic/optical combiner 3 is fixed to the input optical fiber 1, the input optical rotation device 5 is fixed to the input spectroscopic/optical combiner 3, the first output spectroscopic/optical combiner 4 is fixed to the first output optical fiber 2, the first output optical rotation device 6 is fixed to the first output spectroscopic/optical combiner 4, the second output spectroscopic/optical combiner 11 is fixed to the second output optical fiber 12, and the second output optical rotation device 10 is fixed to the second output spectroscopic/optical combiner 11. The light splitting/combining devices 3,4, 11 are displacement type birefringent crystals, and are used for realizing light splitting/combining of o light and e light in the crystals, and optical axes 301, 401, 1101 corresponding to the light splitting/combining devices one by one are inclined with the surface of the crystals, and the angle is 45 degrees. The separation direction of the o light and the e light is perpendicular 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. The optical rotation means 5,6, 11 are a 1/2 lambda phase retardation type quartz wave plate crystal for rotating the polarization direction of linearly polarized light. The optical axis 501 of the input optical rotation device 5 is parallel to the crystal surface and has a rotation angle of 0 degrees with respect to the x-axis, y-axis and 45 degrees polarization direction, the optical axis 601 of the first output optical rotation device 6 is oblique to the crystal surface and has an angle of 22.5 degrees with respect to the x-axis and 45 degrees polarization direction, the optical axis 1001 of the second output optical rotation device 10 is oblique to the crystal surface and has an angle of 22.5 degrees with respect to the x-axis and 45 degrees polarization direction, and the rotation angle of 45 degrees with respect to the x-axis, y-axis and 45 degrees polarization direction.
As shown in fig. 1 and 5, the first lens 7 and the second lens 9 are C lenses for focusing and collimating the light beam, the beam splitting sheet 802 is a glass flat sheet with a certain thickness, and the beam splitting surface 8021 is coated with a beam splitting power TAP film, so that the incident light beam is reflected and transmitted in a certain proportion. The input optical fiber 1 and the first output optical fiber 2 are positioned at one focal plane of the first lens 7, the light splitting plane 8021 of the light splitting sheet 802 is positioned at the other focal plane of the first lens, the second output optical fiber 12 is positioned at one focal plane of the second lens 9, and the light splitting plane 8021 of the light splitting sheet 802 is positioned at the other focal plane of the second lens.
As shown in fig. 2 and 5, the first faraday rotator 801 and the second faraday rotator 803 are magneto-optical crystals, and the rotation angle of the polarization direction of linearly polarized light is 22.5 degrees. The magnetic ring 804 is a permanent magnet, and is used for providing the saturation magnetic field strength of the magneto-optical crystal, so that the magneto-optical crystal realizes the fixed rotation of the polarization direction of linearly polarized light, and the magnetic field direction is parallel to the light propagation direction. The polarization direction is rotated clockwise when the linearly polarized light is incident from the N-order magnetic field, and rotated counterclockwise when the linearly polarized light is incident from the S-order magnetic field.
As shown in FIG. 5, the forward light path realized by the device is that an incident light beam is input from an input optical fiber 1 along the z-axis direction, and two linearly polarized light beams o and e in the x-direction are separated by an input light splitting/combining device 3, wherein the polarization directions of the o and e light beams are respectively in the x-direction and the y-direction; the two linearly polarized light beams in the x and y directions enter the first lens 7, enter the first Faraday rotator 801 from the N level, rotate clockwise by 22.5 degrees respectively, focus on the light splitting surface 8021 of the light splitting plate 802, reflect part of the light and transmit part of the light, reflect back to the first Faraday rotator 801, rotate clockwise by 22.5 degrees again in the polarization direction, enter the first output optical rotator 6 through the first lens 7, rotate clockwise by 45 degrees, and the total optical rotation angle of the linearly polarized light is 90 degrees, and because the optical axis directions of the first output light splitting/combining device 4 and the input light splitting/combining device 3 are parallel to each other, the two linearly polarized light beams enter the first output light splitting/combining device 4 to generate combined light and finally reach the first output optical fiber 2 to output, transmit part of the light to the second Faraday rotator 803, rotate clockwise by 22.5 degrees, enter the second output optical rotator 10 through the second lens 9, rotate clockwise by 45 degrees, enter the first output optical rotator 6 through the first lens, rotate clockwise, and enter the second output optical fiber 11 to generate combined optical fiber 11, and finally enter the second optical fiber 11 to generate combined optical fiber 11, and the total optical rotation angle of the linearly polarized light beams is perpendicular to the second optical axis of the first output optical splitting/combining device.
As shown in FIG. 6, the device realizes a reverse light path, which is that an incident light beam is input from a first output optical fiber 2 along a z-axis direction, two light beams o and e in an x-direction are separated by a first output light splitting/combining device 4, the o and e light polarization directions are respectively in an x-direction and a y-direction, the two light beams in the x-direction and the y-direction pass through a first output optical rotation device 6 to generate rotation, the polarization directions of the two light beams are respectively rotated 45 degrees anticlockwise, the light beams enter a first lens 7, the polarization directions of the two light beams are respectively rotated clockwise by 22.5 degrees from an N-stage and focused on a light splitting surface 8021 of a light splitting plate 802, part of the light is reflected, part of the light is transmitted, the reflected light is reflected back to the first Faraday rotator 801, the polarization directions are respectively rotated clockwise by 22.5 degrees, the light beams are then incident on an input optical rotation device 5 through the first lens 7, no rotation is generated, the total optical rotation angle of the light beams in the x-direction and the y-direction is 0 degree, the polarization directions of the two light beams enter the first output light splitting/combining device 4 and the input optical splitting/combining device 3, namely, the two light beams enter the second optical fiber 3 and the second optical fiber 12 and the second optical fiber are not parallel to each other, and the light beam enters the second optical splitter 3 and the optical fiber and the second optical fiber is not rotated in the first optical fiber and the second optical fiber and the optical fiber 3, and the light splitting device is sequentially, and the light is not rotated, and the light is reflected by the light and the light beam is transmitted from the optical fiber 3 and the light is transmitted to the light and the light beam is respectively.
The incident light beam is input from the second output optical fiber 12 along the z-axis direction, the two light beams o and e in the x-direction are separated by the second output light splitting/combining device 11, the polarization directions of the o and e light beams are respectively in the x-direction and the y-direction, the two light beams in the x-direction and the y-direction are rotated by 45 degrees anticlockwise by the second output optical rotation device 10, the incident light beam enters the second lens 9, the light beam enters the second Faraday rotator 803 from the N level, the polarization directions of the two light beams are respectively rotated by 22.5 degrees clockwise, the light beam is focused on the light splitting surface 8021 of the light splitting plate 802, part of the light beam is reflected, part of the light beam is transmitted, the transmitted light beam is transmitted to the first Faraday rotator 801, the polarization directions are rotated by 22.5 degrees clockwise again, the incident light beam enters the input optical device 5 through the first lens 7, no optical rotation is generated, the total optical rotation angle of the light beam enters the second output light splitting/combining device 11 and the input optical splitting/combining device 3 is 0 degrees, the light beam enters the second optical splitter/combining device 3 and the optical axis is perpendicular to each other, and the light beam enters the second optical splitter 3 and is not rotated by the optical splitter 3, and is deviated from the second optical splitter 2, namely, the light beam enters the second optical splitter 2 and the optical splitter 2 is sequentially output from the second optical splitter 2.
Example 2
As shown in fig. 1 and 2, the structure of the present embodiment includes an input optical fiber 1, a first output optical fiber 2, an input light splitting/combining device 3, a first output light splitting/combining device 4, an input optical rotation device 5, a first output optical rotation device 6, a first lens 7, an isolator core 8, a second lens 9, a second output optical rotation device 10, a second output light splitting/combining device 11, and a second output optical fiber 12, wherein the isolator core 8 includes a first faraday rotator 801, a light splitting sheet 802, a second faraday rotator 803, and a magnetic ring 804 arranged in this order, when an incident light beam is input from the input optical fiber 1, light splitting is generated through the light splitting sheet 802 in the isolator core 8, reflected light is output from the first output optical fiber 2, transmitted light is output from the second output optical fiber 12, when the incident light beam is input from the first output optical fiber 2, light beam is isolated from the input optical fiber 1 and the second output optical fiber 12, and when the incident light beam is input from the second output optical fiber 12, light beam is isolated from the input optical fiber 1 and the first output optical fiber 2.
As shown in FIG. 1, the first output optical fiber 2 and the input optical fiber 1 are combined into a double-fiber optical fiber head, the double-fiber optical fiber head is positioned on the same side of the device, the second output optical fiber 12 is positioned on the other side of the device, the first output optical fiber 2 and the input optical fiber 1 are symmetrical about the central axis of the double-fiber optical head, and the second output optical fiber 12 and the input optical fiber 1 are positioned on two sides of the central axis of the device and are positioned on the same side of the central axis of the device as the first output optical fiber 2.
As shown in fig. 7 and 8, the input spectroscopic/optical combiner 3 is fixed to the input optical fiber 1, the input optical rotation device 5 is fixed to the input spectroscopic/optical combiner 3, the first output spectroscopic/optical combiner 4 is fixed to the first output optical fiber 2, the first output optical rotation device 6 is fixed to the first output spectroscopic/optical combiner 4, the second output spectroscopic/optical combiner 11 is fixed to the second output optical fiber 12, and the second output optical rotation device 10 is fixed to the second output spectroscopic/optical combiner 11. The light splitting/combining devices 3,4, 11 are displacement type birefringent crystals, and are used for realizing light splitting/combining of o light and e light in the crystals, and optical axes 301, 401, 1101 corresponding to the light splitting/combining devices one by one are inclined with the surface of the crystals, and the angle is 45 degrees. The separation direction of the o light and the e light is perpendicular 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. The optical rotation means 5,6, 11 are a 1/2 lambda phase retardation type quartz wave plate crystal for rotating the polarization direction of linearly polarized light. The optical axis 501 of the input optical rotation device 5 is parallel to the crystal surface and has a rotation angle of 0 degrees with respect to the x-axis, y-axis and 45 degrees polarization direction, the optical axis 601 of the first output optical rotation device 6 is oblique to the crystal surface and has an angle of 22.5 degrees with respect to the x-axis and 45 degrees polarization direction, the optical axis 1001 of the second output optical rotation device 10 is oblique to the crystal surface and has an angle of 22.5 degrees with respect to the x-axis and 45 degrees polarization direction, and the rotation angle of 45 degrees with respect to the x-axis, y-axis and 45 degrees polarization direction.
As shown in fig. 1 and 5, the first lens 7 and the second lens 9 are C lenses for focusing and collimating the light beam, the beam splitting sheet 802 is a glass flat sheet with a certain thickness, and the beam splitting surface 8021 is coated with a beam splitting power TAP film, so that the incident light beam is reflected and transmitted in a certain proportion. The input optical fiber 1 and the first output optical fiber 2 are positioned at one focal plane of the first lens 7, the light splitting plane 8021 of the light splitting sheet 802 is positioned at the other focal plane of the first lens, the second output optical fiber 12 is positioned at one focal plane of the second lens 9, and the light splitting plane 8021 of the light splitting sheet 802 is positioned at the other focal plane of the second lens.
As shown in fig. 2 and 9, the first faraday rotator 801 and the second faraday rotator 803 are magneto-optical crystals, and the rotation angle of the polarization direction of linearly polarized light is 22.5 degrees. The magnetic ring 804 is a permanent magnet, and is used for providing the saturation magnetic field strength of the magneto-optical crystal, so that the magneto-optical crystal realizes the fixed rotation of the polarization direction of linearly polarized light, and the magnetic field direction is parallel to the light propagation direction. The polarization direction is rotated clockwise when the linearly polarized light is incident from the N-order magnetic field, and rotated counterclockwise when the linearly polarized light is incident from the S-order magnetic field.
As shown in FIG. 9, the device realizes a forward light path that an incident light beam is input from an input optical fiber 1 along the z-axis direction, and is separated by an input light splitting/combining device 3 to generate two linearly polarized lights o and e in the x-direction, wherein the polarization directions of the o and e lights are respectively the x-direction and the y-direction; the two linearly polarized light beams in the x and y directions enter the first lens 7, enter the first Faraday rotator 801 from the N level, rotate clockwise by 22.5 degrees respectively, focus on the light splitting surface 8021 of the light splitting plate 802, reflect part of the light and transmit part of the light, reflect back to the first Faraday rotator 801, rotate clockwise by 22.5 degrees again in the polarization direction, enter the first output optical rotator 6 through the first lens 7, rotate clockwise by 45 degrees, and reach the total optical rotation angle of 90 degrees, and the two linearly polarized light beams enter the first output optical splitter/combiner 4 to generate combined light and finally reach the first output optical fiber 2 to output, transmit part of the light to the second Faraday rotator 803, rotate clockwise by 22.5 degrees, enter the second output optical rotator 10 through the second lens 9, rotate anticlockwise by 45 degrees, enter the first output optical rotator 6 through the first lens 7, rotate clockwise by 45 degrees, and reach the second optical splitter 11/combiner 11 degrees, and finally reach the second optical splitter 11/combiner 11 degrees, and enter the second optical splitter/combiner 11 degrees, and finally reach the total optical rotation angle of the second optical splitter/combiner 11 degrees, and reach the total optical rotation angle of the first optical splitter/combiner and the second optical splitter and the optical splitter.
As shown in FIG. 10, the device realizes a reverse light path, which is that an incident light beam is input from a first output optical fiber 2 along a z-axis direction, two light beams o and e in an x-direction are separated by a first output light splitting/combining device 4, the o and e light polarization directions are respectively in an x-direction and a y-direction, the two light beams in the x-direction and the y-direction pass through a first output optical rotation device 6 to generate rotation, the polarization directions of the two light beams are respectively rotated 45 degrees anticlockwise, the light beams enter a first lens 7, the polarization directions of the two light beams are respectively rotated clockwise by 22.5 degrees from an N-stage and focused on a light splitting surface 8021 of a light splitting plate 802, part of the light is reflected, part of the light is transmitted, the reflected light is reflected back to the first Faraday rotator 801, the polarization directions are respectively rotated clockwise by 22.5 degrees, the light beams are then incident on an input optical rotation device 5 through the first lens 7, no rotation is generated, the total optical rotation angle of the light beams in the x-direction and the y-direction is 0 degree, the polarization directions of the two light beams enter the first output light splitting/combining device 4 and the input optical splitting/combining device 3, namely, the two light beams enter the second optical fiber 3 and the second optical fiber 12 and the second optical fiber are not parallel to each other, and the light beam enters the second optical splitter 3 and the optical fiber and the second optical fiber is not rotated in the direction, and the second optical fiber is sequentially, and the light is not parallel to the optical fiber 12, and the light enters the second optical fiber is transmitted from the optical fiber 3, and the optical fiber is transmitted from the optical fiber and the optical fiber is 12.
The incident light beam is input from the second output optical fiber 12 along the z-axis direction, the two beams of linearly polarized light o and e in the x-direction are separated by the second output light splitting/combining device 11, the polarization directions of the o and e are respectively in the x-direction and the y-direction, the two beams of linearly polarized light in the x-direction and the y-direction pass through the second output optical rotation device 10 to generate optical rotation, the polarization directions of the two beams of linearly polarized light are respectively rotated 45 degrees clockwise, the incident light enters the second lens 9, the N-level incident light enters the second Faraday rotator 803, the polarization directions of the two beams of linearly polarized light are respectively rotated 22.5 degrees clockwise, the light is focused on the light splitting surface 8021 of the light splitting plate 802, part of the light is reflected, part of the light is transmitted, the transmitted light is transmitted to the first Faraday rotator 801, the polarization directions are respectively rotated clockwise by 22.5 degrees again, the incident light enters the input optical rotation device 5 through the first lens 7, no optical rotation is generated, the total optical rotation angle of the light is 90 degrees, and the directions of the second output light splitting/combining device 11 and the input optical splitting/combining device 3 are mutually parallel, so that the two beams of linearly polarized light enter the second output optical splitter/combining device 3 and are not deviated from the second optical axis 3 to the second optical splitter 2, namely, the first optical splitter 2 and the second optical splitter 3 and the second optical splitter 2 and the first optical splitter 2 and the optical splitter 3 are sequentially output.
It is noted that variations and modifications of the embodiments disclosed herein are possible, and alternatives to and equivalents of the various components of the embodiments are known to those of ordinary skill in the art. It will be apparent to persons skilled in the relevant art that various changes in form and detail can be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A high-isolation optical splitter is characterized by comprising an input optical fiber, a first output optical fiber, an input light splitting/combining device, a first output light splitting/combining device, an input optical rotation device, a first output optical rotation device, a first lens, an isolator core, a second lens, a second output optical rotation device, a second output light splitting/combining device and a second output optical fiber which are sequentially arranged, wherein the input light splitting/combining device and the input optical fiber correspond to the input optical fiber and are sequentially arranged between the end face of the input optical fiber, which is close to the first lens, and the first output light splitting/combining device and the first output optical fiber correspond to the first output optical fiber and are sequentially arranged between the end face of the first output optical fiber, which is close to the first lens, and the second output optical fiber correspond to the second output optical fiber and are sequentially arranged between the end face of the second output optical fiber, which is close to the second lens;
When the incident light beam is input from the first output optical fiber, the input optical fiber is isolated from the light beam on the second output optical fiber, and when the incident light beam is input from the second output optical fiber, the input optical fiber is isolated from the light beam on the first output optical fiber;
The first output optical fiber and the input optical fiber are combined to form a double-fiber optical fiber head structure, and the first output optical fiber and the input optical fiber are symmetrical along a virtual center axis of the double-fiber optical head;
The input light splitting/combining device and the input optical rotation device are corresponding to the input optical fiber and are sequentially arranged on the end face of the input optical fiber, which is close to the first lens, the first output light splitting/combining device and the first output optical rotation device are corresponding to the first output optical fiber and are sequentially arranged on the end face of the first output optical fiber, which is close to the first lens, and the second output light splitting/combining device and the second output optical rotation device are corresponding to the second output optical fiber and are sequentially arranged on the end face of the second output optical fiber, which is close to the second lens.
2. The high isolation beam splitter of claim 1, wherein the second output fiber is one of a dual fiber optic head having a uniform hole spacing from the dual fiber optic head formed by the first output fiber and the input fiber.
3. The high isolation beam splitter of claim 1, wherein the splitting/combining means is a shift type birefringent crystal for splitting/combining o-ray and e-ray in the crystal, an optical axis of the birefringent crystal is oblique to a surface of the crystal at an angle of 45 degrees, and a direction of splitting the o-ray and the e-ray is perpendicular to a direction of propagation of the light beam and parallel to a direction of relative shift of the input optical fiber and the output optical fiber.
4. The high isolation beam splitter of claim 1, wherein the optical rotation angle achieved by the combination of the input optical rotation device, the first output optical rotation device, and the first Faraday rotator is 90 degrees when the input optical rotation device is parallel to the optical axis direction of the first output optical rotation device, the optical rotation angle achieved by the combination of the input optical rotation device, the first output optical rotation device, and the first Faraday rotator is 0 degrees when the input optical rotation device is perpendicular to the optical axis direction of the first output optical rotation device, the optical rotation angle achieved by the combination of the input optical rotation device, the second output optical rotation device, and the second Faraday rotator is 0 degrees when the input optical rotation device is parallel to the optical axis direction of the second output optical rotation device, and the optical rotation angle achieved by the combination of the input optical rotation device, the second output optical rotation device, and the second Faraday rotator is 90 degrees when the input optical rotation device is parallel to the optical axis direction of the second output optical rotation device.
5. The high isolation beam splitter of claim 1, wherein the input optical rotation device, the first output optical rotation device and the second output optical rotation device are 1/2λ phase delay quartz wave plate crystals for rotating polarization directions of linearly polarized light, the combination of the input optical rotation device and the first output optical rotation device achieves an optical rotation angle of 45 degrees, the combination of the input optical rotation device and the second output optical rotation device achieves an optical rotation angle of 45 degrees, and the dimensions of the input optical rotation device, the first output optical rotation device and the second output optical rotation device are identical.
6. The high isolation beam splitter of claim 1, wherein the first lens and the second lens are C-lenses or double-sided focal plane lenses for focusing and collimating the light beam, the input optical fiber and the first output optical fiber are positioned at one focal plane of the first lens, the splitting plane of the splitting sheet is positioned at the other focal plane of the first lens, the second output optical fiber is positioned at one focal plane of the second lens, the splitting plane of the splitting sheet is positioned at the other focal plane of the second lens, and the collimated light spots of the first lens and the second lens are identical.
7. The high isolation beam splitter of claim 1, wherein the first Faraday rotator and the second Faraday rotator are magneto-optical crystals, the rotation angle of the polarization direction of linearly polarized light is 22.5 degrees, the first Faraday rotator and the second Faraday rotator are identical in size, the first lens and the second lens are identical in size and material, and the input beam splitting/combining device is identical in size with the first output beam splitting/combining device and the second output beam splitting/combining device.
8. The high isolation beam splitter of claim 1, wherein the magnetic ring is a permanent magnet for providing a saturation magnetic field strength of the magneto-optical crystal to enable the magneto-optical crystal to realize fixed rotation of a polarization direction of linearly polarized light, the magnetic field direction is parallel to a light propagation direction, the polarization direction rotates clockwise when linearly polarized light is incident from an N-level of a magnetic field formed by the magnetic ring, the polarization direction rotates counterclockwise when linearly polarized light is incident from an S-level of the magnetic field, the beam splitter is a glass plate, and the beam splitting surface is coated with a split power TAP film or a split wavelength WDM film.
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| AU8489498A (en) * | 1997-09-04 | 1999-03-22 | U.S.A. Kaifa Technology, Inc. | Multiport non-reciprocal optical device |
| US5909310A (en) * | 1997-12-08 | 1999-06-01 | U.S.A Kaifa Technology, Inc. | Optical circulator |
| US6226115B1 (en) * | 1998-09-30 | 2001-05-01 | Fujitsu Limited | Optical circulator or switch having a birefringent wedge positioned between faraday rotators |
| US6711310B2 (en) * | 2001-04-02 | 2004-03-23 | Jds Uniphase Corporation | High power fiber isolator |
| US6587273B2 (en) * | 2001-06-25 | 2003-07-01 | Jds Uniphase Corporation | Beam splitting device |
| CN103913857B (en) * | 2014-04-01 | 2017-04-12 | 浙江奥智光电科技有限公司 | Optical isolation method and optical isolation device |
| CN108628013B (en) * | 2017-03-15 | 2024-04-19 | 吕婧菲 | Optical phase conjugate mirror device |
| CN108089352B (en) * | 2018-01-11 | 2021-05-07 | 广东三石园科技有限公司 | Optoelectronic component |
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