Optical device collimator containing isolator
By arranging the isolator on the convergent optical path between the lens and the optical fiber ferrule in the optical device collimator, and adjusting the distance and position of the lens and the optical fiber ferrule, the problem of optical isolators and collimators in optical communication equipment is solved. The problem of independent coupling achieves smaller isolator volume and higher collimator consistency and yield.
Patent Information
- Application Number
- CN202421221602.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-31
- Publication Date
- 2025-01-21
- Estimated Expiration
- 2034-05-31
AI Technical Summary
In existing optical communication equipment, the optical isolator and the collimator are independent components and need to be coupled separately, resulting in working hours and poor consistency of the collimator. The isolator is large in size, which increases the material and process cost. .
Design an optical device collimator containing an isolator. By placing the isolator on the convergent optical path between the lens and the optical fiber ferrule, the volume of the isolator is reduced, and by adjusting the distance between the lens and the optical fiber ferrule. position to ensure the coupling and consistency of the optical path.
It effectively reduces the volume of the isolator and device cost, improves the collimation performance and consistency of the collimator, simplifies the optical path coupling calibration during the production process, and improves the device yield.
Smart Images
Figure CN222379918U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of optical communication equipment, and specifically provides an optical device collimator containing an isolator. Background Art
[0002] The high-speed optical module uses a laser chip to convert electrical signals into optical signals of different wavelengths, which are then transmitted through a wavelength division multiplexer for multi-wavelength combined transmission. After being transmitted through an optical isolator, they enter a collimator and are coupled into a single-mode optical fiber for multi-wavelength unidirectional transmission.
[0003] In actual use, the optical isolator and collimator are independent components that need to be coupled and bonded separately in the optical module, which takes a lot of time and also leads to poor consistency of the collimator. At the same time, the general combination method is to set the isolator on the parallel light beam, and the effective light-transmitting area of the isolator needs to be larger than the diameter of the parallel light beam, which will lead to larger specifications such as the aperture and internal crystal, and increase the material and process costs. Utility Model Content
[0004] The utility model provides an optical device collimator containing an isolator, which improves the collimation performance and consistency of the collimator while reducing the volume of the isolator, thereby reducing the manufacturing cost.
[0005] The technical solution of the utility model is as follows:
[0006] An optical device collimator containing an isolator comprises a pin assembly, one end of the pin assembly is a light outlet for inserting an optical module, and the other end is a light inlet for connecting a wavelength division multiplexer, a lens, an isolator and an optical fiber ferrule are sequentially arranged at the light inlet toward the light outlet, and the central axis of the optical fiber ferrule coincides with the central axis of the pin assembly.
[0007] In this scheme, the parallel composite light of the wavelength division multiplexer is converged by a lens and coupled into the optical fiber ferrule after passing through an isolator. Unlike the existing isolator that is set at the parallel light beam position to isolate the light, in this scheme, the isolator is set between the lens and the optical fiber ferrule so that the isolator is on the converging light path, which greatly reduces the size of the required isolator and effectively reduces the device cost.
[0008] Preferably, a lens holder is provided at the light entrance of the pin assembly, the lens is provided in the lens holder, and the distance between the lens holder and the light entrance is adjustable.
[0009] In this solution, the isolator is fixed in the pin assembly and fixed to the port position of the fiber optic ferrule. The coupling of the optical path is adjusted by changing the distance between the lens and the fiber optic ferrule, and the isolator is coupled together with the fiber optic ferrule. Compared with the structure of an external isolator, the isolator will not block the optical path and there is no need to additionally adjust the isolator coupling, which reduces the difficulty of device coupling calibration during production.
[0010] Preferably, an adjustment ring is sleeved at the light entrance of the pin assembly, and the adjustment ring abuts against the lens bracket.
[0011] In this solution, when the device is produced, there will be errors after the same parts are assembled, so the coupling of the optical path in the collimator must be guaranteed. When the device is calibrated for coupling, the relative distance and position of the lens and the fiber optic ferrule are adjusted to ensure that the optical path output by the lens can converge to the center of the fiber optic ferrule. Due to the existence of various errors, the relative position and distance between the fiber optic ferrule and the lens are different when coupling different collimator optical paths. During calibration, an adjustment ring is set between the two to locate the position of the lens bracket and the fiber optic ferrule during coupling, thereby ensuring the consistency of each collimator and thus ensuring the yield of the device.
[0012] Preferably, the isolator is composed of an internal crystal and an external magnetic ring, and the internal crystal is composed of a 0° polarizer, a Faraday magneto-optical rotation plate and a 45° polarizer in sequence along the incident direction of light.
[0013] Preferably, an anti-reflection film is coated on one end of the optical fiber ferrule close to the isolator to increase the transmittance of the optical fiber and improve the coupling efficiency.
[0014] Preferably, a limiting convex ring is provided at the light outlet of the pin assembly to ensure the fit between the finished collimator and the optical device when the optical device is inserted.
[0015] Preferably, the ferrule assembly is divided into a fiber optic insertion portion and an isolator mounting portion, a gap is provided between the fiber optic insertion portion and the isolator mounting portion, and both ends of the fiber optic ferrule are respectively inserted into the fiber optic insertion portion and the isolator mounting portion.
[0016] In this solution, the pin assembly is divided into two unconnected parts, and electrical isolation is achieved when the optical device housing is used as a ground wire.
[0017] Preferably, the optical fiber insertion portion and the isolator mounting portion are fixedly connected by insulating glue.
[0018] Beneficial effects of the utility model:
[0019] 1. The utility model places the isolator on the converging light path output by the lens, which greatly reduces the volume of the required isolator and effectively reduces the device cost.
[0020] 2. The utility model fixes the port positions of the isolator and the optical fiber ferrule. Compared with the structure of an external isolator, the isolator will not block the light path, and there is no need to additionally adjust the isolator when the device performs optical path coupling calibration, thereby reducing the difficulty of device production coupling calibration.
[0021] 3. During coupling calibration, the utility model can adjust the relative distance and relative position between the lens and the optical fiber ferrule, thereby ensuring that the light path output by the lens can converge to the center of the optical fiber ferrule, ensuring the consistency of each collimator, and thus ensuring the yield of the device. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solution of the present invention, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0023] Figure 1 It is a structural diagram of the utility model;
[0024] Figure 2 This is a light path diagram of the utility model during calibration.
[0025] In the above drawings, the corresponding reference numerals are as follows:
[0026] 1-pin assembly, 12-limiting convex ring, 13-optical fiber insertion part, 14-isolator mounting part, 2-lens, 3-isolator, 4-optical fiber ferrule, 5-lens bracket, 6-adjustment ring. DETAILED DESCRIPTION
[0027] In conjunction with the accompanying drawings, the technical solution of the present invention is clearly and completely described through the specific implementation methods of the embodiments of the present invention.
[0028] like Figure 1 An optical device collimator containing an isolator 3 is shown, comprising a pin assembly 1, one end of the pin assembly 1 is a light outlet for inserting an optical module, and the other end is a light inlet for connecting a wavelength division multiplexer, and a lens 2, an isolator 3 and a fiber optic ferrule 4 are sequentially arranged at the light inlet toward the light outlet, and the central axis of the fiber optic ferrule 4 coincides with the central axis of the pin assembly 1.
[0029] Specifically, the collimator provided by the utility model converges the parallel composite light of the wavelength division multiplexer through the lens 2, and is coupled to the optical fiber core 4 after passing through the isolator 3. The other end of the optical fiber core 4 is coupled to the finished optical fiber connected to the optical device to perform multi-wavelength combination. The isolator 3 is set between the optical fiber core 4 and the lens 2, that is, the isolator 3 is placed on the convergent light path. The beam diameter of the convergent light path is much smaller than the beam diameter of the parallel light path, and the isolator 3 is close to the end face of the optical fiber core 4. The smaller the optical path, the smaller the volume of the isolator 3 required. Generally, the distance between the end face of the optical fiber core 4 and the isolator 3 is 0.10-0.05mm. Compared with placing the isolator 3 on the parallel light path, the volume of the required isolator 3 can be greatly reduced, effectively reducing the device cost.
[0030] Furthermore, a lens holder 5 is provided at the light entrance of the pin assembly 1, and the lens 2 is arranged in the lens holder 5. The lens 2 can be a conventional C lens, which is fixed to the lens holder 5 by glue. The center of the lens 2 must be ensured to coincide with the axis of the optical fiber core 4, and the distance between the lens holder 5 and the light entrance is adjustable.
[0031] Specifically, the isolator 3 is fixedly arranged in the pin assembly 1 and fixed to the port position of the optical fiber ferrule 4. The coupling of the optical path is adjusted by changing the distance between the adjustment lens 2 and the optical fiber ferrule 4, and the isolator 3 is coupled together with the optical fiber ferrule 4. Compared with the structure of the external isolator 3, the isolator 3 will not block the optical path and there is no need to additionally adjust the isolator 3 occasionally, thereby reducing the difficulty of device coupling calibration during production.
[0032] Furthermore, a specific structure for adjusting the distance between the lens 2 and the optical fiber ferrule 4 is provided. An adjusting ring 6 is sleeved at the light entrance of the ferrule assembly 1 , and the adjusting ring 6 abuts against the lens bracket 5 .
[0033] Specifically, during device production, the same components will also have errors after assembly, so the coupling of the optical path in the collimator must be ensured. When the device is calibrated for coupling, the relative distance and position between the lens 2 and the optical fiber ferrule 4 are adjusted to ensure that the optical path output by the lens 2 can converge to the center of the optical fiber ferrule 4. Due to the existence of various errors, the relative position and distance between the optical fiber ferrule 4 and the lens 2 are different when different collimator optical paths are coupled. During calibration, an adjustment ring 6 is set between the two to locate the position of the lens bracket and the optical fiber ferrule during coupling, thereby ensuring the consistency of each collimator, thereby ensuring the yield of the device.
[0034] While ensuring that the light path converged by the lens 2 is on the axis of the optical fiber ferrule 4, the adjustment ring 6 can be threadedly connected to the pin assembly 1, and the position of the adjustment ring 6 on the pin assembly 1 can be adjusted by rotating the adjustment ring 6. At the same time, the lens bracket 5 and the adjustment ring 6 are fixedly connected, and the distance between the lens 2 and the optical fiber ferrule 4 can be adjusted by rotating the adjustment ring 6.
[0035] It should be noted that the process of adjusting the distance and position between the lens 2 and the optical fiber ferrule 4 can only be performed during the coupling calibration process. After the coupling is completed, the position of the adjustment ring 6 needs to be fixed by laser welding or other methods.
[0036] Furthermore, the isolator 3 is composed of an internal crystal and an external magnetic ring, and the internal crystal is composed of a 0° polarizer, a Faraday magneto-optical rotator, and a 45° polarizer in the incident direction of the light. It should be noted that the isolator 3 can be applied to the existing finished isolator 3, and a magnetized Faraday rotator can also be separately provided to ensure the volume of the isolator 3.
[0037] Furthermore, an anti-reflection film is coated on one end of the optical fiber ferrule 4 close to the isolator 3 to increase the transmittance of the optical fiber and improve the coupling efficiency.
[0038] Furthermore, a limiting convex ring 12 is provided at the light outlet of the pin assembly 1 to ensure the fit between the finished collimator and the optical device when the optical device is inserted.
[0039] Furthermore, the ferrule assembly 1 is divided into a fiber insertion portion 13 and an isolator mounting portion 14, a gap is provided between the fiber insertion portion 13 and the isolator mounting portion 14, and both ends of the fiber ferrule 4 are respectively inserted into the fiber insertion portion 13 and the isolator mounting portion 14.
[0040] Specifically, the pin assembly 1 is divided into two unconnected parts, and electrical isolation is achieved when the optical device housing is used as a ground wire. It is necessary to ensure that the axis of the optical fiber insertion part 13, the isolator mounting part 14 and the optical fiber ferrule 4 coincide with each other to ensure horizontal accuracy, while also making it easier to assemble the optical fiber ferrule 4 and the pin assembly 1.
[0041] Furthermore, the optical fiber insertion portion 13 and the isolator mounting portion 14 are fixedly connected by insulating glue, which ensures insulation and also reinforces the needle assembly.
[0042] The coupling calibration steps of the utility model are as follows:
[0043] S1. Prepare a wavelength division multiplexer without an isolator 3 and multiple groups of laser emission ends;
[0044] In this step, except for not including the isolator 3, the other structural parameters of the alignment standard are consistent with the parameters of the collimator to be calibrated.
[0045] S2. Install the collimation standard on the wavelength division multiplexer, connect the output end of the collimation standard to a power meter, and obtain a maximum coupling power by debugging the wavelength division multiplexer;
[0046] In this step, it is necessary to ensure that the lasers emitted from the wavelength division multiplexer are all collimated light and overlap, so as to ensure the true consistency of the calibrated collimator.
[0047] S3. Place the target collimator containing the isolator 3 on the debugged wavelength division multiplexer and connect it to a power meter. Use the clamp to adjust the distance D and relative position between the lens 2 and the optical fiber ferrule 4. When the reading of the power meter is close to the maximum coupling power obtained in S2, the optical path is coupled.
[0048] S4. During the optical path coupling, the adjustment ring 6 is welded to locate the relative position of the lens bracket 5 and the optical fiber ferrule 4, and the coupling calibration of the collimator is completed.
[0049] In this step, the two ends of the adjustment ring 6 are connected to the pin assembly 1 and the lens bracket 5 by lap welding, and the middle position of the adjustment ring 6 is completely fixed to the pin assembly 1 by penetration welding.
[0050] It should be noted that, since the isolator 3 is placed inside the collimator, the collimator can only transmit light in one direction, and the conventional method cannot be used to make the collimation standard. As a result, the collimation performance of the collimator used in coupling cannot be guaranteed, and the individual differences between the collimators are large, which leads to a decrease in the device yield. However, using this step, such as Figure 2 As shown in (a), by providing a collimation standard to obtain the power during coupling, when debugging the target collimator, Figure 2 As shown in (b), by adjusting the distance D between the lens 2 and the optical fiber ferrule 4, the indication of the power meter will change due to the different degrees of optical path coupling. When the indication of the power meter is close to the indication obtained by using the collimation mark, it is coupled, which effectively ensures the yield of the device.
[0051] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.
Claims
1. An optical device collimator containing an isolator, characterized in that: The invention comprises a pin assembly (1), one end of which is a light outlet for inserting an optical module, and the other end of which is a light inlet for connecting a wavelength division multiplexer, wherein a lens (2), an isolator (3) and an optical fiber core (4) are arranged in sequence at the light inlet in the direction of the light outlet, and the central axis of the optical fiber core (4) coincides with the central axis of the pin assembly (1).
2. The optical device collimator containing an isolator according to claim 1, characterized in that: A lens bracket (5) is provided at the light entrance of the pin assembly (1), the lens (2) is arranged in the lens bracket (5), and the distance between the lens bracket (5) and the light entrance is adjustable.
3. The optical device collimator containing an isolator according to claim 2, characterized in that: An adjustment ring (6) is sleeved on the light entrance of the pin assembly (1), and one end of the adjustment ring (6) abuts against the lens bracket (5).
4. The optical device collimator with an isolator according to claim 1, characterized in that: The isolator (3) is composed of an internal crystal and an external magnetic ring, wherein the internal crystal is composed of a 0° polarizing plate, a Faraday magneto-optical rotation plate and a 45° polarizing plate in sequence along the incident direction of light.
5. The optical device collimator with an isolator according to claim 1, characterized in that: One end of the optical fiber ferrule (4) close to the isolator (3) is coated with an anti-reflection film.
6. The optical device collimator with a built-in isolator according to claim 1, characterized in that: A limiting convex ring (12) is provided at the light outlet of the pin assembly (1).
7. An optical device collimator with an isolator according to any one of claims 1 to 6, characterized in that: The ferrule assembly (1) is divided into an optical fiber insertion portion (13) and an isolator mounting portion (14), a gap is provided between the optical fiber insertion portion (13) and the isolator mounting portion (14), and the two ends of the optical fiber ferrule (4) are respectively inserted into the optical fiber insertion portion (13) and the isolator mounting portion (14).
8. The optical device collimator with a built-in isolator according to claim 7, characterized in that: The optical fiber insertion portion (13) and the isolator installation portion (14) are fixedly connected by insulating glue.