Device for accurately testing insertion loss IL and isolation ISO of isolator
By using a five-dimensional and three-dimensional adjustment frame to adjust the position and angle of the optical components, combined with the use of polarizer plates and polarization controllers, the problems of time consumption and poor data repetition are solved in the existing optical isolator test devices, and fast and accurate insertion loss IL and isolation ISO tests are achieved.
Patent Information
- Application Number
- CN202421437790.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-24
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2034-06-24
AI Technical Summary
When testing insertion loss IL and isolation degree ISO, the existing optical isolator test device requires multiple adjustments to the polarization controller and the coupling operation, which consumes a long time and poor data repetition.
The five-dimensional adjustment frame and three-dimensional adjustment frame are used to adjust the position and angle of the lens lens, the isolator under test and the PD photosensitive probe, and the stable adjustment of the light source is completed through the polarizer and the adjustment polarization controller to achieve rapid testing.
The efficiency of isolator testing is greatly improved. The time for testing each isolator is about 3 seconds, the test efficiency is increased by more than 5 times, and the test repeatability is good.
Smart Images
Figure CN222776289U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of optical device testing, in particular to a device for accurately testing the insertion loss IL and isolation ISO of an isolator. Background Art
[0002] An optical isolator is a passive optical device that has very little loss for forward light and very high attenuation for reverse light. It can suppress the adverse effects of unwanted reflected light waves on the light source in optical communication systems and ensure the stable operation of the system. It is a commonly used and indispensable device in large-capacity optical communication systems.
[0003] At present, many test devices use two lenses for coupling, but the lens cannot receive all the lasers transmitted through the optical isolator, so there will be inaccurate display: manual / automatic coupling through two lenses, where the coupling takes a long time, and the different placement of the isolator under test will affect the test value. Moreover, only ISO or IL can be tested separately. If two performance parameters need to be tested, the position of the isolator under test needs to be reversed, and then re-coupled, or an external optical switching switch is connected. In this method, the polarization controller needs to be adjusted multiple times, the coupling operation of the two lenses takes a long time, and the data repeatability is poor, among other problems. Utility Model Content
[0004] In order to solve the problems that the above-mentioned existing isolator testing device needs to adjust the polarization controller multiple times when used to test the two performance parameters IL and ISO, the lens needs to be re-coupled when the performance parameters are rotated for testing, the coupling operation is time-consuming, and the data repeatability is poor, the utility model provides a device for accurately testing the insertion loss IL and isolation ISO of the isolator. First, the positions and angles of the lens, the isolator to be tested and the PD photosensitive probe are adjusted by a five-dimensional adjustment frame and a three-dimensional adjustment frame. The light source can be stably adjusted by a polarizer and adjusting the polarization controller, and the test can be carried out. When the light passes in the forward direction, the insertion loss IL can be tested. The isolation ISO can be tested by flipping the rotatable bracket 180°. The test time of each isolator is about 3 seconds, the test efficiency is improved by more than 5 times, and the test repeatability is good.
[0005] To achieve the above-mentioned purpose, the utility model provides a device for accurately testing the insertion loss IL and isolation ISO of an isolator, characterized in that: it comprises a light source, a polarization controller, a lens, a PD photosensitive probe and an optical power meter connected in sequence from left to right, the light source and the polarization controller are connected through an optical fiber jumper, the PD photosensitive probe and the optical power meter are connected through wires, the lens and the PD photosensitive probe are connected through optical transceiver, the lens and the PD photosensitive probe are respectively fixedly connected to a first five-dimensional adjustment frame and a second five-dimensional adjustment frame, the positions and angles of the lens and the PD photosensitive probe can be adjusted respectively through the first five-dimensional adjustment frame and the second five-dimensional adjustment frame, and a polarizer is provided at the output end of the lens;
[0006] The isolator under test is fixedly connected to the three-dimensional adjustment frame and is arranged between the lens and the PD photosensitive probe. When working, the position and angle of the isolator under test can be adjusted through the three-dimensional adjustment frame so that the isolator under test is arranged in the middle of the optical path. A rotatable magnetic field is arranged on one side of the isolator under test, and the rotatable magnetic field can cover the isolator under test.
[0007] The polarization controller is used to adjust the transmission direction of the light output by the light source in the isolator under test to be consistent with the polarization direction of the isolator under test, the lens is used to couple the light output by the light source into the isolator under test with maximum efficiency, the polarizer is used to determine the polarization direction of the light input end of the isolator under test, the PD photosensitive probe is used to receive the light coming out of the isolator under test, and the optical power meter is used to detect the power of the light coming out of the isolator under test.
[0008] Furthermore, the rotatable magnetic field includes a rotatable bracket and a permanent magnet fixedly connected to the rotatable bracket, the magnetic field strength on the surface of the permanent magnet is greater than 4000 GS, and the direction of the magnetic field can be adjusted by adjusting the rotatable bracket.
[0009] Furthermore, the distance between the lens and the PD photosensitive probe is set to 40-60 mm.
[0010] Furthermore, the light output by the light source is polarized light, and the power of the polarized light is a fixed value.
[0011] Furthermore, the diameter of the PD photosensitive probe is ≥1 mm.
[0012] Furthermore, when the N pole of the rotatable magnetic field faces the lens, light passes in the forward direction, and the insertion loss IL of the isolator under test can be tested. After the insertion loss IL test is completed, the rotatable bracket only needs to be rotated 180° so that the S pole of the rotatable magnetic field faces the lens, and the isolation ISO of the isolator under test can be detected.
[0013] Compared with the prior art, the beneficial effects of the utility model are:
[0014] 1. First, adjust the positions and angles of the lens, the isolator under test and the PD photosensitive probe by adjusting the five-dimensional adjustment frame and the three-dimensional adjustment frame, so that the isolator under test is set in the middle of the optical path of the lens and the PD photosensitive probe. The polarization direction of the light input end of the isolator under test can be determined by the polarizer, and then the light source can be adjusted stably by adjusting the polarization controller. At this time, the utility model can be tested. When the light passes in the forward direction, the insertion loss IL can be tested. The rotatable bracket can be flipped 180°, and the isolation IS0 can be tested without any other operation, which greatly improves the test efficiency of the isolator.
[0015] 2. When testing the IL and ISO of the isolator, the forward input power and the reverse input power of the light are fixed, so that when testing other isolators in the future, there is no need to adjust the polarization controller, which further improves the test efficiency of the isolator. The test time of each isolator in the utility model is about 3 seconds, the test efficiency is improved by more than 5 times, and the test repeatability is good. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic diagram of the principle structure of an embodiment of the utility model.
[0017] In the figure: 1. light source, 2. polarization controller, 3. lens, 4. isolator under test, 5. PD photosensor, 6. optical power meter, 7. first five-dimensional adjustment frame, 8. three-dimensional adjustment frame, 9. rotatable magnetic field, 10. second five-dimensional adjustment frame. DETAILED DESCRIPTION
[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0019] like Figure 1As shown, an apparatus for accurately testing the insertion loss IL and isolation ISO of an isolator according to an embodiment of the utility model comprises a light source 1, a polarization controller 2, a lens 3, a PD photosensitive probe 5 and an optical power meter 6 connected in sequence from left to right, the light source 1 and the polarization controller 2 are connected by an optical fiber jumper, the PD photosensitive probe 5 and the optical power meter 6 are connected by wires, the lens 3 and the PD photosensitive probe 5 are connected by optical transceiver, the lens 3 and the PD photosensitive probe 5 are respectively fixedly connected to a first five-dimensional adjustment frame 7 and a second five-dimensional adjustment frame 10, the positions and angles of the lens 3 and the PD photosensitive probe 5 can be adjusted respectively by the first five-dimensional adjustment frame 7 and the second five-dimensional adjustment frame 10, and a polarizer is provided at the output end of the lens 3;
[0020] The isolator 4 under test is fixedly bonded to a three-dimensional adjustment frame 8 by optical tape, and is arranged between the lens 3 and the PD photosensitive probe 5. During operation, the position and angle of the isolator 4 under test can be adjusted by the three-dimensional adjustment frame 8, so that the isolator 4 under test is arranged in the middle of the optical path. A rotatable magnetic field 9 is provided on one side of the isolator 4 under test, and the rotatable magnetic field 9 can cover the isolator 4 under test; when the magnetic field 9 is rotated, the suction force will not affect the bonding and fixation of the isolator 4 under test by the optical tape.
[0021] The polarization controller 2 is used to adjust the transmission direction of the light output by the light source 1 in the isolator 4 under test to be consistent with the polarization direction of the isolator 4 under test. The lens 3 is used to couple the light output by the light source 1 into the isolator 4 under test with maximum efficiency. The polarizer is used to determine the polarization direction of the light input end of the isolator 4 under test. The PD photosensitive probe 5 is used to receive the light coming out of the isolator 4 under test. The optical power meter 6 is used to detect the power of the light coming out of the isolator 4 under test.
[0022] Furthermore, the rotatable magnetic field 9 includes a rotatable bracket and a permanent magnet fixedly connected to the rotatable bracket. The magnetic field strength on the surface of the permanent magnet is greater than 4000 GS. The direction of the magnetic field can be adjusted by adjusting the rotatable bracket.
[0023] Furthermore, the distance between the lens 3 and the PD photosensitive probe 5 is set to 40-60 mm.
[0024] Furthermore, the light output by the light source 1 is polarized light, and the power of the polarized light is a fixed value.
[0025] Furthermore, the diameter of the PD photosensitive probe 5 is ≥1 mm.
[0026] Furthermore, when the N pole of the rotatable magnetic field 9 is facing the lens 3, light passes in the forward direction, and the insertion loss IL of the isolator 4 under test can be tested. After the insertion loss IL test is completed, it is only necessary to rotate the rotatable bracket 180° so that the S pole of the rotatable magnetic field 9 is facing the lens 3, and the isolation ISO of the isolator 4 under test can be detected.
[0027] The working method of the utility model is as follows: firstly, the positions and angles of the lens 3, the PD photosensitive probe 5 and the isolator 4 to be tested are adjusted respectively by adjusting the first five-dimensional adjustment frame 7, the second five-dimensional adjustment frame 10 and the three-dimensional adjustment frame 8, so that the isolator 4 to be tested is arranged in the middle of the optical path of the lens 3 and the PD photosensitive probe 5, and the polarization direction of the light input end of the isolator 4 to be tested can be determined by the polarizer, and then the light source can be adjusted stably by adjusting the polarization controller 2, and the test can be carried out at this time. When the light passes in the forward direction, the insertion loss IL can be tested, and the rotatable bracket can be flipped 180°, and the isolation IS0 can be tested without any other operation, which greatly improves the test efficiency of the isolator;
[0028] When testing the IL and ISO of the isolator, the forward input power and the reverse input power of the light are fixed, so that when testing other isolators subsequently, there is no need to adjust the polarization controller 2, which further improves the test efficiency of the isolator. The test time of the utility model for testing each isolator is about 3 seconds, the test efficiency is improved by more than 5 times, and the test repeatability is good.
[0029] The embodiment of the utility model is very suitable for testing an isolator core unit, an isolator large piece unit and an isolator finished product without a magnetic block.
[0030] The above are only preferred implementations of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.
Claims
1. A device for accurately testing the insertion loss IL and isolation ISO of an isolator, characterized by: It includes a light source, a polarization controller, a lens, a PD photosensitive probe and an optical power meter connected in sequence from left to right, wherein the light source and the polarization controller are connected via an optical fiber jumper, the PD photosensitive probe and the optical power meter are connected via electric wires, the lens and the PD photosensitive probe are connected via optical transceiver, the lens and the PD photosensitive probe are respectively fixedly connected to a first five-dimensional adjustment frame and a second five-dimensional adjustment frame, the positions and angles of the lens and the PD photosensitive probe can be respectively adjusted via the first five-dimensional adjustment frame and the second five-dimensional adjustment frame, and a polarizer is provided at the output end of the lens; The isolator under test is fixedly connected to the three-dimensional adjustment frame and is arranged between the lens and the PD photosensitive probe. When working, the position and angle of the isolator under test can be adjusted through the three-dimensional adjustment frame so that the isolator under test is arranged in the middle of the optical path. A rotatable magnetic field is arranged on one side of the isolator under test, and the rotatable magnetic field can cover the isolator under test. The polarization controller is used to adjust the transmission direction of the light output by the light source in the isolator under test to be consistent with the polarization direction of the isolator under test, the lens is used to couple the light output by the light source into the isolator under test with maximum efficiency, the polarizer is used to fix the polarization direction of the light coming out of the lens, the PD photosensitive probe is used to receive the light coming out of the isolator under test, and the optical power meter is used to detect the power of the light coming out of the isolator under test.
2. The device for accurately testing the insertion loss IL and isolation ISO of an isolator according to claim 1, characterized in that: The rotatable magnetic field comprises a rotatable bracket and a permanent magnet fixedly connected to the rotatable bracket. The magnetic field strength on the surface of the permanent magnet is greater than 4000 GS. The direction of the magnetic field can be adjusted by adjusting the rotatable bracket.
3. The device for accurately testing the insertion loss IL and isolation ISO of an isolator according to claim 2, characterized in that: The distance between the lens and the PD photosensitive probe is set to 40-60 mm.
4. The device for accurately testing the insertion loss IL and isolation ISO of an isolator according to claim 1, characterized in that: The light output by the light source is polarized light, and the power of the polarized light is a fixed value.
5. The device for accurately testing the insertion loss IL and isolation ISO of an isolator according to claim 1, characterized in that: The diameter of the PD photosensitive probe is ≥1 mm.
6. The device for accurately testing the insertion loss IL and isolation ISO of an isolator according to claim 1, characterized in that: When the N pole of the rotatable magnetic field faces the lens, light passes forward, and the insertion loss IL of the isolator under test can be tested. After the insertion loss IL test is completed, the rotatable bracket only needs to be rotated 180° so that the S pole of the rotatable magnetic field faces the lens, and the isolation ISO of the isolator under test can be detected.