Optical transmitting assembly and optical module suitable for single-mode and multi-mode optical fibers
Patent Information
- Application Number
- CN202522694426.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-19
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-12-19
AI Technical Summary
然而，这种离焦耦合方式会导致激光光束的焦点偏离光纤纤芯，致使大部分光功率进入光纤插针的包层而非纤芯
[0018]1、通过在管壳内或者光口单元中集成衰减组件，能够对DFB组件输出的光源功率进行衰减，使得本光发射组件能够采用准直耦合方式，有效解决了单模与多模混合应用中的模场失配和功率不匹配问题，显著增强了光器件在多模态光纤环境下的兼容性、适应性与性能一致性。
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Figure CN224907094U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of optical communication technology, specifically to an optical transmitting component and optical module suitable for single-mode optical fiber and multimode optical fiber. Background Technology
[0002] With the continuous growth of global AI computing power demand and the upgrading and evolution of networks, situations often arise where single-mode and multi-mode optical fibers are used in hybrid networks. However, due to the significant difference in mode field diameter between single-mode and multi-mode fibers, switching between them can lead to severe mode field mismatch and power mismatch problems, resulting in a surge in insertion loss, low coupling efficiency, and unstable system performance. Existing technologies either employ expensive mode-switching devices or compromise through defocus coupling, but these methods suffer from drawbacks such as high cost, poor performance, and low stability. For example, regarding defocus coupling, such as... Figure 1 As shown, power requirements are met by deliberately reducing coupling efficiency. However, this defocused coupling method causes the laser beam's focus to deviate from the fiber core, resulting in most of the optical power entering the cladding of the fiber ferrule rather than the core. Since the core diameter of multimode fiber (MMF) is much larger than that of single-mode fiber (SMF), and it can transmit a portion of the optical power in the cladding, during testing, the power value measured using multimode fiber is much higher than that measured using single-mode fiber, resulting in a huge power difference between single-mode and multimode testing conditions. Utility Model Content
[0003] The purpose of this invention is to provide an optical transmitting component and optical module suitable for single-mode and multimode optical fibers, which can at least solve some of the defects in the prior art.
[0004] To achieve the above objectives, the present invention provides the following technical solution: an optical transmitting component suitable for single-mode and multimode optical fibers, comprising a housing and an optical port unit disposed at the optical port end of the housing, wherein a DFB component, a collimating component, a wavelength division multiplexer, and an isolator are sequentially disposed in the housing along the optical path direction, and the optical transmitting component further comprises an attenuation component for attenuating the light source power output by the DFB component, wherein the attenuation component is integrated in the housing or integrated in the optical port unit.
[0005] Furthermore, the attenuation component includes a first attenuator, which is disposed in the optical path inside the housing or in the optical path of the optical port unit.
[0006] Furthermore, the first attenuator is disposed in the optical path between the DFB component and the collimating component;
[0007] Alternatively, the first attenuator may be disposed in the optical path between the collimation component and the wavelength division multiplexer;
[0008] Alternatively, the first attenuator may be disposed in the optical path between the wavelength division multiplexer and the isolator;
[0009] Alternatively, the first attenuator can be positioned in the optical path between the isolator and the light outlet of the housing.
[0010] Furthermore, the attenuation component includes a first attenuation film, which is disposed on the collimation component, the wavelength division multiplexer, or the isolator.
[0011] Furthermore, a converging lens is also provided in the optical path of the optical port unit.
[0012] Furthermore, the attenuation component includes a second attenuation film, which is deposited on the light-incident surface or light-outceasing surface of the converging lens.
[0013] Furthermore, the attenuation component includes a second attenuator, which is disposed on the front or rear optical path of the converging lens.
[0014] Furthermore, the optical port unit is connected to a single-mode optical fiber.
[0015] Furthermore, the optical port unit is connected to a multimode optical fiber.
[0016] This utility model provides another technical solution: an optical module, including an optical receiving component and the above-mentioned optical emitting component.
[0017] Compared with the prior art, the beneficial effects of this utility model are:
[0018] 1. By integrating attenuation components inside the housing or in the optical port unit, the power of the light source output by the DFB component can be attenuated, enabling the optical transmitting component to adopt collimated coupling. This effectively solves the mode field mismatch and power mismatch problems in single-mode and multi-mode mixed applications, and significantly enhances the compatibility, adaptability and performance consistency of optical devices in multi-mode fiber environments.
[0019] 2. It effectively overcomes the mode field mismatch between single-mode and multimode fibers, significantly improving the compatibility and adaptability of optical devices in two different scenarios; it reduces insertion loss, improves coupling efficiency, and ensures the stability and reliability of optical signal transmission; by realizing multi-scenario applications in a single optical device design, it avoids the use of expensive mode conversion modules and reduces the overall cost of the solution; it provides a more flexible and economical technical option for network upgrades and hybrid networking. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of an existing defocus coupling optical path;
[0021] Figure 2A schematic diagram of a collimated coupling optical path for an optical transmitting component suitable for single-mode and multimode optical fibers, provided for an embodiment of this utility model;
[0022] Figure 3 A schematic diagram of a light-emitting component suitable for single-mode and multimode optical fibers provided for an embodiment of this utility model (the attenuator is in the optical port unit).
[0023] Figure 4 A schematic diagram of a light-emitting component suitable for single-mode and multimode optical fibers provided for an embodiment of this utility model (the attenuation film is on the wavelength division multiplexer).
[0024] Figure 5 A schematic diagram of a light-emitting component suitable for single-mode and multimode optical fibers provided for an embodiment of this utility model (attenuation film on isolator).
[0025] In the attached figures, the following labels are used: 1-tube shell; 2-optical port unit; 3-DFB assembly; 4-collimation assembly; 5-isolator; 6-wavelength division multiplexer; 7-second attenuator; 8-first attenuation film; a-cladding; b-fiber core. Detailed Implementation
[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.
[0027] Please see Figure 3 , Figure 4 and Figure 5This utility model provides an optical transmitting component suitable for single-mode and multimode optical fibers, including a housing 1 and an optical port unit 2 disposed at the optical port end of the housing 1. A DFB component 3, a collimating component 4, a wavelength division multiplexer 6, and an isolator 5 are sequentially arranged along the optical path in the housing 1. The optical transmitting component also includes an attenuation component for attenuating the light source power output by the DFB component 3. The attenuation component is integrated within the housing 1 or within the optical port unit 2. In this embodiment, by integrating the attenuation component within the housing 1 or within the optical port unit 2, the light source power output by the DFB component 3 can be attenuated, enabling the optical transmitting component to adopt a collimated coupling method. This effectively solves the mode field mismatch and power mismatch problems in mixed single-mode and multimode applications, significantly enhancing the compatibility, adaptability, and performance consistency of optical devices in multimode fiber environments. Specifically, in the manufacturing process of TOSA, when using a high-efficiency laser to achieve a lower output power target, traditional processes typically employ defocus coupling. Figure 1 As shown, power requirements are met by deliberately reducing coupling efficiency. However, this defocused coupling method causes the laser beam's focus to deviate from the fiber core b, resulting in most of the optical power entering the cladding a of the fiber ferrule instead of the core b. Since the core b diameter of multimode fiber (MMF) is much larger than that of single-mode fiber (SMF), and it can transmit part of the optical power in cladding a, during testing, the power value measured using multimode fiber is much higher than that measured using single-mode fiber, resulting in a huge power difference under single-mode / multimode testing conditions. To solve this problem, this embodiment introduces an attenuation component, which allows the device to be fabricated using a collimated coupling method (…). Figure 2 As shown in the diagram, this allows laser energy to be efficiently and precisely focused and injected into the center of fiber core b, ensuring that optical power is concentrated and transmitted within fiber core b to the maximum extent. This significantly reduces power measurement deviations between single-mode and multimode fibers in cross-application scenarios, improving product consistency and reliability.
[0028] Please see Figure 3 , Figure 4 and Figure 5 The attenuation component includes a first attenuator, which is disposed in the optical path inside the housing 1 or in the optical path of the optical port unit 2. In this embodiment, the attenuation component can be further refined into an attenuator, which can be disposed inside the housing 1 or in the optical port unit 2, and can attenuate the power of the light source in the optical path, thereby achieving collimation coupling.
[0029] For a further detailed explanation of the above embodiments, please refer to [link / reference]. Figure 3 , Figure 4 and Figure 5Inside the housing, the first attenuator is disposed on the optical path between the DFB component and the collimating component; or the first attenuator is disposed on the optical path between the collimating component and the wavelength division multiplexer; or the first attenuator is disposed on the optical path between the wavelength division multiplexer and the isolator; or the first attenuator is disposed on the optical path between the isolator and the light outlet of the housing. In this embodiment, the position of the first attenuator can be between the DFB component and the collimating component, between the collimating component and the wavelength division multiplexer, between the wavelength division multiplexer and the isolator, or on the optical path after the isolator. All these implementations can attenuate the power of the light source, and any one of the setting methods can be selected as needed. This embodiment does not limit this. For example, if the wavelength division multiplexer 5 has four optical channels, then correspondingly, four first attenuators can be disposed on the four optical paths between the wavelength division multiplexer 5 and the collimating component 4, or one first attenuator can be disposed at the light outlet, that is, on the optical path between the wavelength division multiplexer 5 and the isolator 6. Similarly, if the DFB assembly has four DFB lasers outputting four beams, then the collimation assembly also has four collimating lenses to collimate the four beams respectively. In this case, a first attenuator is provided in each of the four beams between the four collimating lenses and the four DFB lasers, or a first attenuator is provided in each of the four beams between the four collimating lenses and the four filters of the wavelength division multiplexer 5. When there are more optical paths, more attenuators are provided as needed. For example, in an eight-channel configuration, the four first attenuators mentioned in the above embodiment can be increased to eight.
[0030] Please see Figure 3 , Figure 4 and Figure 5The attenuation component includes a first attenuation film 8, which is disposed on the collimation component 4, the wavelength division multiplexer 5, or the isolator 6. In this embodiment, in addition to using the aforementioned attenuation sheet to attenuate the light source power inside the housing 1, the light source power can also be attenuated by coating. Specifically, an attenuation film can be coated on the collimation component 4, the wavelength division multiplexer 5, or the isolator 6 to attenuate the light source power and thus achieve collimation coupling. Specifically, the first attenuation film 8 is coated on the light-incident surface or the light-exit surface of the collimation component 4; or the first attenuation film 8 is coated on the light-incident surface or the light-exit surface of the wavelength division multiplexer 5; or the first attenuation film 8 is coated on the light-incident surface or the light-exit surface of the isolator 6. Coating on the light-incident surface or the light-exit surface attenuates the light power passing through the current device. For example, if a wavelength division multiplexer 5 has four optical channels, then correspondingly, a first attenuation film can be deposited on each of the four filters at the input surface of the wavelength division multiplexer 5, or at the output surface after multiplexing, where a first attenuation film 8 is deposited. Similarly, if a DFB assembly has four DFB lasers and outputs four beams, then correspondingly, the collimation assembly also has four collimating lenses to collimate the four beams respectively, and the input or output surfaces of the four collimating lenses can be deposited with a first attenuation film 8.
[0031] Please see Figure 3 , Figure 4 and Figure 5 The optical path of the optical port unit 2 is also provided with a converging lens (not shown). Preferably, the attenuation component includes a second attenuation film, which is deposited on the light-incident or light-outcident surface of the converging lens. Alternatively, the attenuation component includes a second attenuation plate 7, which is disposed on the front or rear optical path of the converging lens. In this embodiment, there are two attenuation methods in the optical port unit 2: one is to use an attenuation film, and the other is to use an attenuation plate. To distinguish them from the attenuation film and attenuation plate in the above embodiments, the terms first attenuation film, second attenuation film, first attenuation plate, and second attenuation plate are defined. They have no functional difference, but are only used to distinguish their placement. When attenuation is achieved by coating, the second attenuation film can be disposed on the light-incident or light-outcident surface of the converging lens. When attenuation is achieved by placing an attenuation plate on the optical path, the second attenuation plate 7 can be disposed on the front optical path of the converging lens or on the rear optical path of the converging lens. Preferably, as Figure 3 , Figure 4 and Figure 5 As shown, the optical port unit 2 includes a mounting housing, a converging lens disposed within the mounting housing, and an adjustment ring disposed on the optical path to the right of the mounting housing. An adapter is located on the optical path to the right of the adjustment ring. If a second attenuator 7 is designed, both the second attenuator 7 and the converging lens can be disposed within the mounting housing. Figure 3The second attenuator 7 is shown in the mounting housing, but the converging lens is not shown. In some embodiments, a converging lens is not required, so it is not shown here. The mounting housing is connected to the adapter via an adjustment ring.
[0032] Please see Figure 3 , Figure 4 and Figure 5 The optical port unit 2 is connected to a single-mode optical fiber. Alternatively, the optical port unit 2 is connected to a multimode optical fiber. By employing the aforementioned attenuation components, this optical port unit 2 can be used with both single-mode and multimode optical fibers.
[0033] Thus, the core of this embodiment is the integration of optical attenuation into the optical path, achieving efficient collimated coupling through precise control of optical power levels. Traditional methods often employ defocus coupling to meet specific power requirements. However, in cross-applications of single-mode and multimode fibers, the significant differences in mode field distribution between the two can easily lead to excessive optical power deviation, low coupling efficiency, and unstable system performance. This embodiment, by introducing optical attenuation and optimizing its integrated design, effectively overcomes the challenges of mode field mismatch and power mismatch in cross-application scenarios. It significantly improves the compatibility, adaptability, and performance consistency of optical devices in both single-mode and multimode fiber environments, thereby accommodating the needs of multiple application scenarios within a single design. It also enables efficient transmission of optical signals with low insertion loss and high return loss, while reducing system costs and enhancing product market competitiveness.
[0034] Please see Figure 3 , Figure 4 and Figure 5 This utility model provides an optical module, including an optical receiving component and the aforementioned optical emitting component. The optical emitting component can be used in the optical module to improve its performance and expand its application range.
[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A light-emitting component suitable for single-mode and multimode optical fibers, characterized in that: The device includes a housing and an optical port unit disposed at the optical port end of the housing. A DFB component, a collimation component, a wavelength division multiplexer, and an isolator are sequentially arranged in the housing along the optical path direction. The optical emitting component also includes an attenuation component for attenuating the light source power output by the DFB component. The attenuation component is integrated into the housing or into the optical port unit.
2. The optical emitting component applicable to single-mode and multimode optical fibers as described in claim 1, characterized in that: The attenuation component includes a first attenuator, which is disposed in the optical path inside the housing or in the optical path of the optical port unit.
3. The optical transmitting component applicable to single-mode and multimode optical fibers as described in claim 2, characterized in that: The first attenuator is disposed in the optical path between the DFB component and the collimating component; Alternatively, the first attenuator may be disposed in the optical path between the collimation component and the wavelength division multiplexer; Alternatively, the first attenuator may be disposed in the optical path between the wavelength division multiplexer and the isolator; Alternatively, the first attenuator can be positioned in the optical path between the isolator and the light outlet of the housing.
4. The optical transmitting component applicable to single-mode and multimode optical fibers as described in claim 1, characterized in that: The attenuation component includes a first attenuation film, which is disposed on the collimation component, the wavelength division multiplexer, or the isolator.
5. The optical transmitting component applicable to single-mode and multimode optical fibers as described in claim 1, characterized in that: A converging lens is also provided in the optical path of the optical port unit.
6. The optical transmitting component applicable to single-mode and multimode optical fibers as described in claim 5, characterized in that: The attenuation component includes a second attenuation film, which is deposited on the light-incident or light-outceasing surface of the converging lens.
7. The optical emitting component applicable to single-mode and multimode optical fibers as described in claim 5, characterized in that: The attenuation component includes a second attenuator, which is disposed on the front or rear optical path of the converging lens.
8. The optical transmitting component applicable to single-mode and multimode optical fibers as described in claim 1, characterized in that: The optical port unit is connected to a single-mode optical fiber.
9. The optical emitting component applicable to single-mode and multimode optical fibers as described in claim 1, characterized in that: The optical port unit is connected to a multimode optical fiber.
10. An optical module, characterized in that: It includes an optical receiving component and an optical emitting component as described in any one of claims 1-9.