CN113934011A - Polarization controller, titanium diffusion straight waveguide tail fiber polarization crosstalk test system and method - Google Patents
Polarization controller, titanium diffusion straight waveguide tail fiber polarization crosstalk test system and method Download PDFInfo
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- CN113934011A CN113934011A CN202111400564.0A CN202111400564A CN113934011A CN 113934011 A CN113934011 A CN 113934011A CN 202111400564 A CN202111400564 A CN 202111400564A CN 113934011 A CN113934011 A CN 113934011A
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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
- G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
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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
- G02B6/2753—Optical coupling means with polarisation selective and adjusting means characterised by their function or use, i.e. of the complete device
- G02B6/2766—Manipulating the plane of polarisation from one input polarisation to another output polarisation, e.g. polarisation rotators, linear to circular polarisation converters
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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
- G02B6/2753—Optical coupling means with polarisation selective and adjusting means characterised by their function or use, i.e. of the complete device
- G02B6/2793—Controlling polarisation dependent loss, e.g. polarisation insensitivity, reducing the change in polarisation degree of the output light even if the input polarisation state fluctuates
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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
- G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends
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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
- G02B6/36—Mechanical coupling means
- G02B6/38—Mechanical coupling means having fibre to fibre mating means
- G02B6/3807—Dismountable connectors, i.e. comprising plugs
- G02B6/381—Dismountable connectors, i.e. comprising plugs of the ferrule type, e.g. fibre ends embedded in ferrules, connecting a pair of fibres
- G02B6/3825—Dismountable connectors, i.e. comprising plugs of the ferrule type, e.g. fibre ends embedded in ferrules, connecting a pair of fibres with an intermediate part, e.g. adapter, receptacle, linking two plugs
Abstract
The invention provides a polarization controller, a titanium diffusion straight waveguide tail fiber polarization crosstalk test system and a method. The polarization controller includes: the input end of the first collimating lens is used for connecting a light source; the linear polarization control sheet is arranged on a transmission path of light rays passing through the first collimating lens; and the second collimating lens is arranged on a transmission path of the light after passing through the linear polarization control sheet. By adopting the polarization controller, the titanium diffusion straight waveguide tail fiber polarization crosstalk testing system and the method, the polarization of light is realized by rotating the linear polarization control sheet, so that the process of welding the polarization waveguide in the waveguide polarizer and the waveguide to be tested in a polarization maintaining manner when the waveguide polarizer is used for polarizing the light is avoided, the polarization process is simplified, and the work efficiency is improved.
Description
Technical Field
The invention relates to the technical field of optical waveguide devices, in particular to a polarization controller, a titanium diffusion straight waveguide tail fiber polarization crosstalk test system and a method.
Background
The titanium-diffused lithium niobate optical waveguide is a common device in an optical system, and has wide application in numerous fields such as optical communication, high-power laser synthesis, laser radar, precision measurement, sensing and the like because the titanium-diffused lithium niobate optical waveguide can adjust the phase characteristics of light waves.
Before use, the polarization crosstalk of the titanium diffused straight waveguide needs to be tested, and because the titanium diffused straight waveguide is in a dual-polarization working mode, the polarization crosstalk of TE/TM can be respectively tested only after the light input into the waveguide is polarized. In the prior art, a polarization part mainly adopts a waveguide type polarizer, however, the waveguide with the polarization function needs to be subjected to polarization maintaining fusion with the waveguide to be detected, the polarization maintaining fusion requirement is high, the fusion process time is long, the test parameters are limited by polarization crosstalk of tail fibers of the waveguide polarizer, and the mass and high-efficiency normal-temperature test requirement is not favorably realized.
Disclosure of Invention
In view of the above, the present invention provides a polarization controller, a titanium-diffused straight waveguide pigtail polarization crosstalk testing system and a method thereof, which enable light to pass through a first collimating lens and then transmit to a linear polarization control plate, and the linear polarization control plate is used to adjust circularly polarized light into linearly polarized light, and then the linearly polarized light passes through a second collimating lens and then transmits to the titanium-diffused straight waveguide, so that polarization-maintaining fusion between a polarization waveguide and the titanium-diffused straight waveguide is not required, thereby overcoming the defects of the prior art.
The polarization controller provided by the invention comprises: the input end of the first collimating lens is used for connecting a light source; the linear polarization control sheet is arranged on a transmission path of light rays passing through the first collimating lens; and the second collimating lens is arranged on a transmission path of the light after passing through the linear polarization control sheet.
Optionally, the polarization controller further includes an optical platform, and the first collimating lens, the linear polarization control plate, and the second collimating lens are disposed on the optical platform.
The invention also provides a titanium diffused straight waveguide tail fiber polarization crosstalk test system, which comprises a titanium diffused straight waveguide, an extinction ratio tester and the polarization controller, wherein the input end of the titanium diffused straight waveguide is connected with the output end of a second collimating lens of the polarization controller; and the output end of the titanium diffusion straight waveguide is connected with the input end of the extinction ratio tester.
Optionally, the titanium diffused straight waveguide pigtail polarization crosstalk test system further includes a light source, and the light source is connected to an input end of the first collimating lens of the polarization controller.
Optionally, an input end pigtail is coupled to an input end of the titanium diffused straight waveguide, and the input end pigtail is connected to an output end of the second collimating lens.
Optionally, the input end pigtail is configured as a polarization maintaining fiber.
Optionally, an output end tail fiber is coupled to an output end of the titanium diffused straight waveguide, and the output end tail fiber is connected to an input end of the extinction ratio tester.
Optionally, the output end pigtail is configured as a polarization maintaining fiber.
Optionally, the titanium diffused straight waveguide pigtail polarization crosstalk test system further includes: the two opposite ends of the first optical fiber adapter are respectively connected with the input end tail fiber and the output end of the second collimating lens; and the two opposite ends of the second optical fiber adapter are respectively connected with the tail fiber of the output end and the input end of the extinction ratio tester.
The invention also provides a method for testing the polarization crosstalk of the titanium diffused straight waveguide tail fiber, which tests the polarization crosstalk by using any one of the systems for testing the polarization crosstalk of the titanium diffused straight waveguide tail fiber, and comprises the following steps:
arranging a first collimating lens, a linear polarization control sheet and a second collimating lens of a polarization controller along the same straight line in sequence;
adjusting the first collimating lens, the linear polarization control plate and the second collimating lens to the same horizontal height;
adjusting the first collimating lens and the second collimating lens to make the light power value of the light passing through the first collimating lens and the second collimating lens be the maximum value;
connecting the output end of the second collimating lens with the input end of the titanium diffusion straight waveguide;
connecting the output end of the titanium diffusion straight waveguide with the input end of an extinction ratio tester;
connecting the input end of the first collimating lens with an external light source to detect polarization crosstalk;
and rotating the linear polarization control plate to detect the polarization crosstalk of the TE mode propagation direction and the TM mode propagation direction.
Compared with the prior art, the technical scheme provided by the invention at least has the following beneficial effects:
by adopting the polarization controller, the titanium diffusion straight waveguide tail fiber polarization crosstalk testing system and the method, the polarization of light is realized by rotating the linear polarization control sheet, so that the process of welding the polarization waveguide in the waveguide polarizer and the waveguide to be tested in a polarization maintaining manner when the waveguide polarizer is used for polarizing the light is avoided, the polarization process is simplified, and the work efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of a polarization controller according to an embodiment of the present invention;
FIG. 2 is a schematic connection diagram of a titanium-diffused straight waveguide pigtail polarization crosstalk testing system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a Ti-diffused straight waveguide of the Ti-diffused straight waveguide pigtail polarization crosstalk test system shown in FIG. 2;
fig. 4 is a flowchart of a method for testing polarization crosstalk of a tail fiber of a titanium-diffused straight waveguide according to an embodiment of the present invention.
Reference numerals:
1: a polarization controller; 11: a first collimating lens; 12: a linear polarization control sheet; 13: a second collimating lens; 14: an optical platform; 2: a titanium diffused straight waveguide; 21: a titanium diffusion chip; 22: a straight waveguide; 3: an extinction ratio tester; 4: a light source.
Detailed Description
The embodiments of the present invention will be further described with reference to the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention, and do not indicate or imply that the device or assembly referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
Fig. 1 is a schematic diagram of a polarization controller according to an embodiment of the present invention. As shown in fig. 1, the polarization controller 1 includes a first collimating lens 11, a linear polarization control sheet 12, and a second collimating lens 13. The input end of the first collimating lens 11 is used for connecting a light source; the linear polarization control plate 12 is arranged on a transmission path of light after passing through the first collimating lens 11; the second collimating lens 13 is disposed on a transmission path of the light after passing through the linear polarization control plate 12.
When the polarization controller 1 is used for polarizing light, the first collimating lens 11, the linear polarization control plate 12 and the second collimating lens 13 are arranged in the same straight line and adjusted to the same horizontal height, the input end of the first collimating lens 11 is connected with a light source, and the first collimating lens 11 and the second collimating lens 13 are adjusted to make the light power value of the light emitted from the light source after passing through the two be the maximum value. Light emitted by the light source is transmitted to the linear polarization control sheet 12 after passing through the first collimating lens 11, the linear polarization control sheet 12 can adjust circularly polarized light emitted by the light source into linearly polarized light, so that the light is polarized, the linearly polarized light can be matched with other devices to be tested after passing through the second collimating lens 13, for example, the titanium diffusion straight waveguide is used for detecting polarization crosstalk of the devices to be tested, and tail fiber polarization crosstalk of the TE mode propagation direction and the TM mode propagation direction can be detected by rotating the linear polarization control sheet 12.
By adopting the polarization controller, the polarization of light is realized by rotating the linear polarization control sheet 12, so that the process of fusion welding of polarization waveguide in the waveguide polarizer and the waveguide to be detected in polarization maintaining manner is avoided when the waveguide polarizer is used for polarizing the light, the polarization process is simplified, and the work efficiency is improved.
In this embodiment, as shown in fig. 1, the first collimating lens 11 is on the left side, the second collimating lens 13 is on the right side, the linear polarization control plate 12 is located between the first collimating lens 11 and the second collimating lens 13, the first collimating lens 11 and the second collimating lens are located on the same straight line and at the same horizontal height, the left side of the first collimating lens 11 is an input end for connecting a light source, the right side of the second collimating lens 13 is an output end for connecting a device to be detected, such as a titanium diffused straight waveguide, and the linear polarization control plate 12 can rotate an angle to realize polarization of light. The linear polarization control plate 12 is a mature prior art, and the specific working principle thereof is not described herein again. According to practical applications, the sizes of the first collimating lens 11, the linear polarization control plate 12 and the second collimating lens 13 and the relative distances therebetween can be adjusted.
Optionally, the polarization controller 1 further includes an optical platform 14, and the first collimating lens 11, the linear polarization control sheet 12, and the second collimating lens 13 are disposed on the optical platform 14. The optical platform 14 can provide a horizontal, stable platform.
In this embodiment, as shown in fig. 1, the optical platform 14 is horizontally disposed, the first collimating lens 11 is disposed at the left end of the optical platform 14 in fig. 1 and perpendicular to the optical platform 14, the second collimating lens 13 is disposed at the right end of the optical platform 14 in fig. 1 and perpendicular to the optical platform 14, and the linear polarization control plate 12 is disposed at the center of the optical platform 14 in fig. 1 and perpendicular to the optical platform 14. The optical platform 14 is a mature prior art, and the specific structure, the adjustment process, and the installation process with each structural component are not described herein any more, and the optical platform 14 may select any specification model sold in the market as required.
FIG. 2 is a schematic connection diagram of a titanium-diffused straight waveguide pigtail polarization crosstalk testing system according to an embodiment of the present invention; FIG. 3 is a schematic diagram of a Ti-diffused straight waveguide of the Ti-diffused straight waveguide pigtail polarization crosstalk test system shown in FIG. 2. As shown in fig. 2 and fig. 3, the present invention further provides a titanium diffused straight waveguide pigtail polarization crosstalk testing system, which includes a titanium diffused straight waveguide 2, an extinction ratio tester 3, and a polarization controller 1 according to any of the above embodiments, wherein an input end of the titanium diffused straight waveguide 2 is connected to an output end of a second collimating lens 13 of the polarization controller 1; the output end of the titanium diffusion straight waveguide 2 is connected with the input end of the extinction ratio tester 3.
When the linear polarization control device is used, the first collimating lens 11, the linear polarization control plate 12 and the second collimating lens 13 are arranged in the same straight line and adjusted to the same horizontal height, the input end of the first collimating lens 11 is connected with a light source, and the first collimating lens 11 and the second collimating lens 13 are adjusted to enable the light power value of light emitted from the light source after passing through the first collimating lens 11 and the second collimating lens 13 to be the maximum value. Light emitted by the light source is transmitted to the linear polarization control sheet 12 after passing through the first collimating lens 11, the linear polarization control sheet 12 can adjust circularly polarized light emitted by the light source into linearly polarized light, the linearly polarized light is transmitted to the titanium diffusion straight waveguide 2 after passing through the second collimating lens 13, and then is transmitted to the extinction ratio tester 3 through the titanium diffusion straight waveguide 2, so that polarization crosstalk is detected. After the polarization crosstalk detection in a certain direction is completed, the linear polarization control plate 12 is rotated by 90 °, and the polarization crosstalk detection process is repeated, so that the polarization crosstalk in the TE mode propagation direction and the polarization crosstalk in the TM mode propagation direction are obtained.
By adopting the titanium diffusion straight waveguide tail fiber polarization crosstalk testing system, the polarization of light is realized by rotating the linear polarization control sheet 12, so that the process of maintaining the polarization waveguide in the waveguide polarizer and the waveguide to be tested for polarization fusion when the waveguide polarizer is used for polarizing the light is avoided, the polarization process is simplified, the polarization crosstalk detection efficiency is improved, the influence of the tail fiber polarization crosstalk value of the polarization waveguide can be avoided, and the accurate test is facilitated.
In this embodiment, as shown in fig. 3, the titanium-diffused straight waveguide 2 includes a titanium-diffused chip 21 and a straight waveguide 22 embedded in a central line position of an upper surface of the titanium-diffused chip 21, a left end of the titanium-diffused straight waveguide 2 is a light input end, and a right end of the titanium-diffused straight waveguide 2 is a light output end. The extinction ratio tester 3 is an extinction ratio tester with the same wavelength as the titanium diffusion straight waveguide 2. When the polarization crosstalk detection is performed, the input end and the output end of the titanium diffusion straight waveguide 2 are respectively connected with a tail fiber, the second collimating lens 13 of the polarization controller 1 is connected with the tail fiber at the input end of the titanium diffusion straight waveguide 2 through an optical fiber adapter, and the extinction ratio tester 3 is connected with the tail fiber at the output end of the titanium diffusion straight waveguide 2 through the optical fiber adapter. After being output by the polarization controller 1, the light is adjusted into linearly polarized light from circularly polarized light, is transmitted to the titanium diffusion straight waveguide 2 through the optical fiber adapter and the tail fiber, is transmitted to the extinction ratio tester 3 through the tail fiber at the output end of the titanium diffusion straight waveguide 2 and the optical fiber adapter, and finally is subjected to polarization crosstalk detection. According to practical application, the titanium diffused straight waveguide 2 and the polarization controller 1, and the titanium diffused straight waveguide 2 and the extinction ratio tester 3 may be connected by other elements besides an optical fiber adapter.
Optionally, the titanium diffused straight waveguide pigtail polarization crosstalk test system further includes a light source 4, and the light source 4 is connected to an input end of the first collimating lens 11 of the polarization controller 1. The light source 4 is arranged, so that the titanium diffused straight waveguide tail fiber polarization crosstalk test system has higher integration level, and the whole polarization crosstalk detection process can be completed without depending on an external light source.
In this embodiment, the light source 4 is a circularly polarized light source with the same wavelength as the titanium diffused straight waveguide 2, and the light source 4 is connected to the input end of the first collimating lens 11 of the polarization controller 1 through a single-mode jumper. According to practical application, the light source 4 can be any commercially available light source meeting the test conditions.
Optionally, an input end pigtail (not shown) is coupled to an input end of the titanium diffused straight waveguide 2, and the input end pigtail is connected to an output end of the second collimating lens 13. The input end tail fiber is arranged, so that when the output end of the second collimating lens 13 is connected with the input end of the titanium diffusion straight waveguide 2 through the optical fiber adapter, the input end tail fiber is directly used for introducing a light source, and a tail fiber introduction light source does not need to be temporarily coupled, so that the coupling time is saved, and the overall working efficiency is improved.
In this embodiment, the left end of the titanium diffused straight waveguide 2 in fig. 3 is an input end, and the input end pigtail is coupled to the left end of the titanium diffused straight waveguide 2 in fig. 3, that is, coupled to the left end of the straight waveguide 22 in fig. 3.
Optionally, the input end pigtail is configured as a polarization maintaining fiber. The polarization maintaining optical fiber transmits linearly polarized light, the linear polarization direction can be ensured to be unchanged, and the coherent signal-to-noise ratio is improved, so that high-precision measurement of physical quantity is realized.
Optionally, an output end pigtail (not shown) is coupled to the output end of the titanium diffused straight waveguide 2, and the output end pigtail is connected to the input end of the extinction ratio tester 3. The arrangement of the tail fiber at the output end can directly utilize the tail fiber at the output end to output a light source when the input end of the extinction ratio tester 3 is connected with the output end of the titanium diffusion straight waveguide 2 through an optical fiber adapter, and a tail fiber leading-out light source does not need to be temporarily coupled, so that the coupling time is saved, and the overall working efficiency is improved.
In this embodiment, the right end of the titanium diffused straight waveguide 2 in fig. 3 is an output end, and the output end pigtail is coupled to the right end of the titanium diffused straight waveguide 2 in fig. 3, that is, the right end of the straight waveguide 22 in fig. 3.
Optionally, the output end pigtail is configured as a polarization maintaining fiber. The polarization maintaining optical fiber transmits linearly polarized light, the linear polarization direction can be ensured to be unchanged, and the coherent signal-to-noise ratio is improved, so that high-precision measurement of physical quantity is realized.
Optionally, the titanium diffused straight waveguide pigtail polarization crosstalk test system further comprises a first fiber adapter (not shown) and a second fiber adapter (not shown). The two opposite ends of the first optical fiber adapter are respectively connected with the input end tail fiber and the output end of the second collimating lens 13, and the two opposite ends of the second optical fiber adapter are respectively connected with the output end tail fiber and the input end of the extinction ratio tester 3. The first optical fiber adapter is pre-connected with the input end tail fiber and the output end of the second collimating lens 13, and the second optical fiber adapter is pre-connected with the output end tail fiber and the input end of the extinction ratio tester 3, so that the temporary connection of the input end tail fiber and the second collimating lens 13 or the temporary connection of the output end tail fiber and the extinction ratio tester 3 when polarization crosstalk needs to be detected is avoided, the connection time is saved, and the overall working efficiency is improved.
The optical fiber adapter is mature prior art, the specific structure of the optical fiber adapter is not described herein any more, and according to the practical application situation, the first optical fiber adapter and the second optical fiber adapter can be any specification type meeting the connection condition.
The use process of the titanium diffused straight waveguide tail fiber polarization crosstalk test system is further described as follows:
when the device is used, the first collimating lens 11, the linear polarization control plate 12 and the second collimating lens 13 are arranged in the same straight line and adjusted to the same horizontal height, the light source 4 is connected to the input end of the first collimating lens 11 through a single-mode jumper, the output end of the second collimating lens 13 is connected to the input end tail fiber coupled to the input end of the titanium diffusion straight waveguide 2 through the first optical fiber adapter, the output end tail fiber coupled to the output end of the titanium diffusion straight waveguide 2 is connected to the extinction ratio tester 3 through the second optical fiber adapter, the light source 4 is turned on, the first collimating lens 11 and the second collimating lens 13 are adjusted, and the value of the optical power of the light emitted from the light source 4 after passing through the two is the maximum value. Light emitted by the light source 4 is transmitted to the linear polarization control sheet 12 after passing through the first collimating lens 11, the linear polarization control sheet 12 can adjust circularly polarized light emitted by the light source into linearly polarized light, the linearly polarized light is transmitted to the titanium diffusion straight waveguide 2 after passing through the second collimating lens 13, and then is transmitted to the extinction ratio tester 3 through the titanium diffusion straight waveguide 2, so that polarization crosstalk is detected. After the polarization crosstalk detection in a certain direction is completed, the linear polarization control plate 12 is rotated by 90 °, and the polarization crosstalk detection process is repeated, so that the polarization crosstalk in the TE mode propagation direction and the polarization crosstalk in the TM mode propagation direction are obtained.
By adopting the titanium diffusion straight waveguide tail fiber polarization crosstalk testing system, the polarization of light is realized by rotating the linear polarization control sheet 12, so that the process of maintaining the polarization waveguide in the waveguide polarizer and the waveguide to be tested for polarization fusion when the waveguide polarizer is used for polarizing the light is avoided, the polarization process is simplified, the polarization crosstalk detection efficiency is improved, the influence of the tail fiber polarization crosstalk value of the polarization waveguide can be avoided, and the accurate test is facilitated.
Fig. 4 is a flowchart of a method for testing polarization crosstalk of a tail fiber of a titanium-diffused straight waveguide according to an embodiment of the present invention. As shown in fig. 4, the present invention further provides a method for testing polarization crosstalk of a titanium diffused straight waveguide pigtail, where the method for testing polarization crosstalk of a titanium diffused straight waveguide pigtail according to any of the above embodiments includes the following steps:
s101: the first collimating lens 11, the linear polarization control plate 12, and the second collimating lens 13 of the polarization controller 1 are sequentially arranged along the same straight line.
S102: the first collimating lens 11, the linear polarization control plate 12, and the second collimating lens 13 are adjusted to the same level.
S103: and adjusting the first collimating lens 11 and the second collimating lens 13 to make the optical power value of the light passing through the first collimating lens 11 and the second collimating lens 13 be the maximum value.
S104: and connecting the output end of the second collimating lens 13 with the input end of the titanium diffusion straight waveguide 2.
S105: and connecting the output end of the titanium diffusion straight waveguide 2 with the input end of an extinction ratio tester 3.
S106: the input end of the first collimating lens 11 is connected to an external light source to detect polarization crosstalk.
S107: the linear polarization control plate 12 is rotated to detect the polarization crosstalk in the TE mode propagation direction and the TM mode propagation direction.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A polarization controller, comprising:
the input end of the first collimating lens is used for connecting a light source;
the linear polarization control sheet is arranged on a transmission path of light rays passing through the first collimating lens;
and the second collimating lens is arranged on a transmission path of the light after passing through the linear polarization control sheet.
2. The polarization controller of claim 1, further comprising:
and the first collimating lens, the linear polarization control sheet and the second collimating lens are arranged on the optical platform.
3. A titanium diffused straight waveguide pigtail polarization crosstalk test system, including titanium diffused straight waveguide and extinction ratio tester, characterized by, also include the polarization controller of claim 1 or 2, the input end of the said titanium diffused straight waveguide is connected with output end of the second collimating lens of the said polarization controller; and the output end of the titanium diffusion straight waveguide is connected with the input end of the extinction ratio tester.
4. The titanium diffused straight waveguide pigtail polarization crosstalk testing system of claim 3, further comprising:
a light source connected to an input end of a first collimating lens of the polarization controller.
5. The titanium diffused straight waveguide pigtail polarization crosstalk test system of claim 3 or 4, wherein:
the input end of the titanium diffusion straight waveguide is coupled with an input end tail fiber, and the input end tail fiber is connected with the output end of the second collimating lens.
6. The titanium diffused straight waveguide pigtail polarization crosstalk test system of claim 5, wherein:
the input end tail fiber is set as a polarization maintaining fiber.
7. The titanium diffused straight waveguide pigtail polarization crosstalk test system of claim 5, wherein:
the output end of the titanium diffusion straight waveguide is coupled with an output end tail fiber, and the output end tail fiber is connected with the input end of the extinction ratio tester.
8. The titanium diffused straight waveguide pigtail polarization crosstalk test system of claim 7, wherein:
the tail fiber of the output end is set as a polarization maintaining fiber.
9. The titanium diffused straight waveguide pigtail polarization crosstalk testing system of claim 7, further comprising:
the two opposite ends of the first optical fiber adapter are respectively connected with the input end tail fiber and the output end of the second collimating lens;
and the two opposite ends of the second optical fiber adapter are respectively connected with the tail fiber of the output end and the input end of the extinction ratio tester.
10. A method for testing polarization crosstalk of a titanium diffused straight waveguide tail fiber, which is characterized in that the method for testing the polarization crosstalk by the polarization crosstalk testing system of the titanium diffused straight waveguide tail fiber of any one of claims 3 to 9 comprises the following steps:
arranging a first collimating lens, a linear polarization control sheet and a second collimating lens of a polarization controller along the same straight line in sequence;
adjusting the first collimating lens, the linear polarization control plate and the second collimating lens to the same horizontal height;
adjusting the first collimating lens and the second collimating lens to make the light power value of the light passing through the first collimating lens and the second collimating lens be the maximum value;
connecting the output end of the second collimating lens with the input end of the titanium diffusion straight waveguide;
connecting the output end of the titanium diffusion straight waveguide with the input end of an extinction ratio tester;
connecting the input end of the first collimating lens with an external light source to detect polarization crosstalk;
and rotating the linear polarization control plate to detect the polarization crosstalk of the TE mode propagation direction and the TM mode propagation direction.
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| CN117193261A (en) * | 2023-10-13 | 2023-12-08 | 华南师范大学 | Polarization controller performance test method, system and device |
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2021
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117193261A (en) * | 2023-10-13 | 2023-12-08 | 华南师范大学 | Polarization controller performance test method, system and device |
| CN117193261B (en) * | 2023-10-13 | 2024-04-02 | 华南师范大学 | Polarization controller performance test method, system and device |
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