A receiving end assembly of a high-speed optical module

Abstract

The utility model discloses a receiving end subassembly of high speed optical module, including printed circuit board, still include, optical fiber array, optical fiber array sets up on printed circuit board, and with printed circuit board electricity is connected, and optical fiber array's light output end is towards photodiode and sets up, and the optical fiber in optical fiber array is inclined and sets up, and the interval between each passageway of optical fiber array is 250um, photodiode, and with printed circuit board electricity is connected, and the output of photodiode is connected with the input of transimpedance amplifier, and sends telecommunication signal to transimpedance amplifier, transimpedance amplifier, and with printed circuit board electricity is connected, and the input of transimpedance amplifier is coupled with the output of photodiode, and the amplified telecommunication signal is exported outward, digital signal processing chip, and the input of digital signal processing chip is connected with the output of transimpedance amplifier, the utility model discloses through reducing the interval between optical fiber array passageway, makes full use of the limited space on printed circuit board, reduces the space occupied.

Description

Technical Field

[0001] This utility model relates to the field of optical module technology, and in particular to a receiver component for a high-speed optical module. Background Technology

[0002] The main function of the high-speed optical module receiver component is to convert optical signals into electrical signals and amplify and shape them so that subsequent digital circuits can accurately identify and process the data.

[0003] In the prior art, Chinese patent document with publication number CN220105355U discloses an optical module receiver sub-assembly, including a circuit board, a collimator, an optical splitter, a deflecting prism, a detector, a transimpedance amplifier, and a coupling lens. The optical input end of the collimator is connected to a metal adapter via an optical fiber. The optical output end of the collimator is aligned with the optical input end of the optical splitter. The optical output end of the optical splitter is aligned with the optical input end of the deflecting prism. The optical output end of the deflecting prism is aligned with the optical input end of the coupling lens. The coupling lens has an internal cavity space for positioning and accommodating the detector and the transimpedance amplifier. The optical output end of the coupling lens is coupled and aligned with the detector.

[0004] The existing optical module receiver sub-components occupy a large space, which limits their miniaturization. Therefore, it is necessary to improve this structure to overcome the aforementioned shortcomings. Utility Model Content

[0005] The purpose of this invention is to provide a receiver component for a high-speed optical module, which solves the problem that existing optical module receiver sub-components occupy a large space, thus limiting the miniaturization of optical module receiver sub-components.

[0006] The above-mentioned technical objective of this utility model is achieved by the following technical solution:

[0007] A receiver assembly for a high-speed optical module includes a printed circuit board (PCB) for providing electrical connections and mechanical support for the receiver assembly, and further includes...

[0008] The fiber optic array is mounted on and electrically connected to the printed circuit board. The fiber optic array is used to output optical signals to the photodiode to complete photoelectric conversion. The optical output end of the fiber optic array is set towards the photodiode. The optical fibers in the fiber optic array are set at an angle. The spacing between each channel of the fiber optic array is 250um.

[0009] A photodiode is mounted on a printed circuit board and electrically connected to it. The output of the photodiode is connected to the input of a transimpedance amplifier. The photodiode is used to convert the received optical signal into an electrical signal and send the electrical signal to the transimpedance amplifier.

[0010] A transimpedance amplifier is mounted on and electrically connected to a printed circuit board. The input terminal of the transimpedance amplifier is coupled to the output terminal of a photodiode. The transimpedance amplifier is used to amplify the received electrical signal and output the amplified electrical signal.

[0011] A digital signal processing chip is mounted on and electrically connected to a printed circuit board. The input terminal of the digital signal processing chip is connected to the output terminal of a transimpedance amplifier. The digital signal processing chip is used to process received data signals.

[0012] A further feature of this invention is that the fiber tilt angle in the fiber array is between 40 and 45°.

[0013] A further feature of this invention is that multiple photodiodes are provided, with a spacing of 250 μm between adjacent photodiodes.

[0014] A further feature of this invention is that the photodiode is a front-illuminated photodiode.

[0015] A further feature of this invention is that an integrated lens is provided on the photodiode, which is used to improve the coupling efficiency between the fiber array and the photodiode.

[0016] A further feature of this invention is that the spacing between the channels of the transimpedance amplifier is 250µm.

[0017] A further feature of this invention is that the fiber array employs an arrayed waveguide grating.

[0018] In summary, this utility model has the following beneficial effects:

[0019] 1. By reducing the spacing between fiber optic array channels, the overall size of the fiber optic array is reduced, making full use of the limited space on the printed circuit board, allowing more fiber optic channels to be integrated within the limited area of ​​the printed circuit board, thus reducing the space occupied by the fiber optic array.

[0020] 2. The optical fibers in the fiber optic array are set at an angle, which can prevent reflected light from recoupling back into the fiber, effectively reducing the interference of reflected light, making the transmitted signal more stable, thereby improving the reliability of communication and the accuracy of data transmission. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] Figure 2 This is a schematic diagram of an existing receiver component.

[0023] Figure 3 This is a schematic diagram of Embodiment 1 of the present invention.

[0024] Digital labels: Digital signal processing chip 100, transimpedance amplifier 101, photodiode 103, fiber optic array 104, printed circuit board 110. Detailed Implementation

[0025] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with the illustrations and specific embodiments.

[0026] like Figures 1 to 3 As shown, the present invention proposes a high-speed optical module receiver assembly, including a printed circuit board 110 (PCB), which provides electrical connection and mechanical support for the receiver assembly.

[0027] Fiber optic array 104 is mounted on a printed circuit board and electrically connected to the printed circuit board 110. Fiber optic array 104 is used to output optical signals to photodiode 103 to complete photoelectric conversion. The optical output end of fiber optic array 104 is positioned facing photodiode 103 to ensure that fiber optic array 104 can be precisely coupled to the input end of photodiode 103.

[0028] Specifically, the fiber array 104 adopts a narrow channel fiber array 104, and the spacing between each channel of the fiber array 104 is 250um. Preferably, the optical fibers in the fiber array 104 are inclined, and the inclination angle of the optical fibers is between 40-45°. The inclined optical fibers can improve the coupling efficiency between the optical signal and the photodiode 103, which is beneficial to improving the transmission and conversion speed of the optical signal.

[0029] In some embodiments, the fiber array 104 employs an arrayed waveguide grating (AWG), with a spacing of 250 μm between each channel of the arrayed waveguide grating.

[0030] A photodiode (PD) 103 is disposed on a printed circuit board and electrically connected to the printed circuit board 110. The output terminal of the photodiode 103 is connected to the input terminal of the transimpedance amplifier 101. The photodiode 103 is used to convert the received optical signal into an electrical signal and send the electrical signal to the transimpedance amplifier 101. Multiple photodiodes 103 together form a photodiode 103 array. The spacing between adjacent photodiodes 103 is the same as the spacing between the channels of the fiber optic array 104, and the spacing between the photodiodes 103 is 250um.

[0031] Specifically, the photodiode 103 is a front-illuminated photodiode 103. When the light signal shines on the front surface of the front-illuminated photodiode 103, the photons penetrate the front surface and excite electron-hole pairs to form a photocurrent. The magnitude of the photocurrent is proportional to the intensity of the incident light, thereby realizing the photo-to-electric conversion.

[0032] Preferably, an integrated lens (not shown in the figure) is disposed on the photodiode 103. The integrated lens is used to achieve precise focusing of light and improve the coupling efficiency between the fiber array 104 and the photodiode 103. By using the front-illuminated photodiode 103 in conjunction with the integrated lens, the coupling efficiency between the fiber array 104 and the photodiode 103 can be further improved, thereby improving the photoelectric conversion efficiency.

[0033] Trans-Impedance Amplifier 101 (TIA) is disposed on and electrically connected to the printed circuit board 110. The input terminal of the trans-impedance amplifier 101 is coupled to the output terminal of the photodiode 103. The trans-impedance amplifier 101 is used to amplify the received electrical signal and output the amplified electrical signal to the digital signal processing chip 100.

[0034] Specifically, the transimpedance amplifier 101 adopts a narrow channel spacing. The spacing between each channel of the transimpedance amplifier 101 is the same as the spacing between the photodiodes 103. The spacing between the transimpedance amplifiers 101 is 250um. The narrow channel spacing of the transimpedance amplifier 101 can reduce the volume occupied. More transimpedance amplifiers 101 can be integrated on the same area of ​​printed circuit board, thereby significantly improving space utilization and making the layout of the receiver components more compact.

[0035] Digital signal processing chip 100 (DSP) is disposed on printed circuit board 110 and electrically connected to printed circuit board 110. The input terminal of digital signal processing chip 100 is connected to the output terminal of transimpedance amplifier 101. Digital signal processing chip 100 is used to process received data signals.

[0036] In use, the fiber optic array 104 outputs an optical signal, which illuminates the input terminal of the photodiode 103. The photodiode 103 converts the optical signal into an electrical signal and transmits the electrical signal to the transimpedance amplifier 101. After receiving the electrical signal output by the photodiode 103, the transimpedance amplifier 101 amplifies it to increase the signal amplitude, and then outputs the amplified electrical signal to the digital signal processing chip 100. The digital signal processing chip 100 processes the electrical signal output by the transimpedance amplifier 101.

[0037] Example 1:

[0038] like Figure 3 As shown, in this embodiment, there are two receiving end components, both positioned close to the digital signal processing chip 100 to improve signal transmission efficiency. The two receiving end components maintain a certain distance, with a distance D along the Y-axis, preferably 50-150 μm. If the two receiving end components are too close, problems such as optical interference may occur, affecting their normal operation. By maintaining a certain distance D along the Y-axis, mutual interference between the components is avoided, ensuring that each receiving end component can operate independently and stably, maintaining high-speed signal performance while preserving the optical coupling efficiency of the photodiode 103.

[0039] In this embodiment, the fiber optic array 104 is a narrow-channel fiber optic array 104, with a spacing of 250µm between each channel. The narrow-channel design helps integrate more channels within a limited space, increasing the transmission density of optical signals. The optical fibers in the fiber optic array 104 are tilted, with a tilt angle between 45° and 45°. This tilted arrangement alters the transmission path of the optical signal, allowing it to couple more effectively to the photodiode 103, thereby improving the coupling efficiency between the optical signal and the photodiode 103 and enhancing the transmission and conversion speed of the optical signal. This solves the problem of low coupling efficiency between the optical signal and the photodiode 103 in traditional receiver components. Through the tilted arrangement of the optical fibers and the application of integrated lenses, the coupling efficiency between the optical signal and the photodiode 103 is improved, enabling more optical signals to be effectively received and converted.

[0040] In this embodiment, multiple photodiodes 103 together form a photodiode array 103, with a spacing of 250µm between adjacent photodiodes 103, matching the channel spacing of the fiber array 104, ensuring that the optical signal can be accurately coupled to the corresponding photodiode 103. This solves the problem of low photo-to-electric conversion efficiency. The use of front-illuminated photodiodes 103, with their fast response speed and high quantum efficiency, combined with an integrated lens, further improves coupling efficiency, thereby significantly improving the photo-to-electric conversion efficiency.

[0041] In this embodiment, the transimpedance amplifier 101 employs a narrow-channel spacing design, with each channel spaced at 250µm. This narrow-channel spacing reduces the volume occupied by the transimpedance amplifier 101, allowing for the integration of more transimpedance amplifiers 101 on a printed circuit board of the same area. This significantly improves space utilization and makes the layout of the receiver components more compact, thus solving the problem of low component space utilization. By using a narrow-channel spacing fiber array 104, photodiode array 103, and transimpedance amplifier 101, more components can be integrated on a printed circuit board of the same area, improving space utilization and making the layout of the receiver components more compact.

[0042] In summary, maintaining a certain space between the two receiving components ensures both high-speed signal performance and the optical coupling efficiency of the photodiodes. The inclined optical fiber alters the optical signal transmission path, allowing for more effective coupling to the photodiodes and improving the coupling efficiency between the optical signal and the photodiodes. Matching the adjacent spacing of the photodiode array with the channel spacing of the optical fiber array guarantees accurate optical signal coupling. The use of front-illuminated photodiodes, combined with integrated lenses, further enhances coupling efficiency, significantly improving the photoelectric conversion efficiency.

[0043] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connect" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. In this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0044] Any descriptions not covered in the above specific embodiments of this utility model belong to the well-known technology in the field, and can be implemented by referring to the well-known technology.

[0045] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A receiver assembly for a high-speed optical module, comprising a printed circuit board, the printed circuit board being used to provide electrical connections and mechanical support for the receiver assembly, characterized in that, It also includes, The fiber optic array is mounted on and electrically connected to a printed circuit board. The fiber optic array is used to output optical signals to a photodiode to complete photoelectric conversion. The optical output end of the fiber optic array is oriented towards the photodiode. The optical fibers in the fiber optic array are arranged at an angle. The spacing between each channel of the fiber optic array is 250 μm. A photodiode is disposed on and electrically connected to a printed circuit board. The output terminal of the photodiode is connected to the input terminal of a transimpedance amplifier. The photodiode is used to convert a received optical signal into an electrical signal and send the electrical signal to the transimpedance amplifier. A transimpedance amplifier is mounted on and electrically connected to a printed circuit board. The input terminal of the transimpedance amplifier is coupled to the output terminal of a photodiode. The transimpedance amplifier is used to amplify the received electrical signal and output the amplified electrical signal. A digital signal processing chip is disposed on and electrically connected to a printed circuit board. The input terminal of the digital signal processing chip is connected to the output terminal of a transimpedance amplifier. The digital signal processing chip is used to process received data signals.

2. The receiving end component of a high-speed optical module according to claim 1, characterized in that, The fiber tilt angle in the fiber array is between 40 and 45°.

3. The receiving end component of a high-speed optical module according to claim 1, characterized in that, Multiple photodiodes are provided, with a spacing of 250µm between adjacent photodiodes.

4. The receiving end component of a high-speed optical module according to claim 1, characterized in that, The photodiode is a front-illuminated photodiode.

5. The receiving end component of a high-speed optical module according to claim 1, characterized in that, An integrated lens is provided on the photodiode, which is used to improve the coupling efficiency between the fiber array and the photodiode.

6. The receiving end component of a high-speed optical module according to claim 1, characterized in that, The spacing between the channels of the transimpedance amplifier is 250µm.

7. The receiving end component of a high-speed optical module according to claim 1, characterized in that, The fiber array employs an arrayed waveguide grating.

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