Optical transceiver provided with multiple filter capacitors with noise absorbers

Abstract

An optical transceiver provided with a plurality of filter capacitors having a noise absorber includes a printed circuit board, a transceiver module, a plurality of filter capacitors, and a noise absorber. The printed circuit board is provided with a plurality of signal lines and a plurality of golden fingers, and each of the plurality of golden fingers is connected to one of the plurality of signal lines. The transceiver module is arranged on the printed circuit board and is connected with the plurality of signal lines. Each of the plurality of filter capacitors is located on one of the plurality of signal lines. The noise absorber covers at least one surface of the plurality of filter capacitors, and the at least one surface is opposite to the printed circuit board.

Description

Technical Field

[0001] The present invention relates to an optical transceiver, and in particular to an optical transceiver provided with a plurality of filter capacitors having noise absorbers. Background Art

[0002] Optical fiber is widely used to transmit audio and data signals. As a transmission medium, optical technology offers many advantages over traditional electronic communication methods. For example, optical signals allow for extremely high transmission rates and very high bandwidth capacity. In addition, optical components provide safer signal transmission because it does not allow parts of the signal to escape from the fiber optic cable, as can happen with wired systems. Optical transmission can also cover longer distances without the signal losses typically associated with copper wires that carry telecommunication signals.

[0003] As the optical transmission rates provided by electronic modules increase, additional problems arise. For example, electronic devices and components operating at high frequencies often emit signals known as electromagnetic interference (EMI). This form of electrical noise is undesirable because it can disrupt the normal operation of other electronic components. Optical transceiver packages, especially those operating at high transmission rates, are particularly susceptible to radiated EMI. Summary of the invention

[0004] In view of the above, the present invention provides an optical transceiver.

[0005] According to an embodiment of the present invention, an optical transceiver comprises a printed circuit board, a transceiver module, a plurality of filter capacitors and a noise absorber. The printed circuit board is provided with a plurality of signal lines and a plurality of gold fingers, each of the plurality of gold fingers being connected to one of the plurality of signal lines. The transceiver module is disposed on the printed circuit board and connected to the plurality of signal lines. Each of the plurality of filter capacitors is located on one of the plurality of signal lines. The noise absorber covers at least one surface of the plurality of filter capacitors, and the at least one surface is opposite to the printed circuit board.

[0006] In summary, the optical transceiver according to one or more embodiments of the present invention can reduce electromagnetic interference, thereby reducing the impact of electromagnetic interference on the operation of the optical transceiver.

[0007] The above description of the content of the present invention and the following description of the implementation modes are used to demonstrate and explain the spirit and principle of the present invention, and to provide further explanation for the protection scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 FIG. 4 is a schematic diagram of an optical transceiver according to an embodiment of the present invention.

[0009] Figure 2 The figure shows a cross-sectional view of a printed circuit board, a filter capacitor and a noise absorber.

[0010] Figure 3 Another cross-sectional view showing a printed circuit board, a filter capacitor and a noise absorber.

[0011] [Description of Reference Numerals]

[0012] 1: Optical transceiver

[0013] 10: Printed Circuit Board

[0014] 11: Transceiver module

[0015] 12: Filter capacitor

[0016] 13: Noise absorber

[0017] 130: Sub-absorber

[0018] 101: Gold Finger

[0019] 102: Signal line

[0020] D1: Set direction DETAILED DESCRIPTION

[0021] The detailed features and advantages of the present invention are described in detail in the following embodiments, and the contents are sufficient to enable ordinary technicians in the field to understand the technical content of the present invention and implement it accordingly. According to the contents, protection scope and drawings disclosed in this specification, ordinary technicians in the field can easily understand the relevant purposes and advantages of the present invention. The following examples further illustrate the viewpoints of the present invention in detail, but do not limit the scope of the present invention in any viewpoint.

[0022] According to an embodiment of the present invention, an optical transceiver may include a printed circuit board, a filter capacitor, and a noise absorber. A surface of one side of the filter capacitor is opposite to the printed circuit board, and the noise absorber covers the surface of the filter capacitor. By providing the noise absorber, electromagnetic interference on the optical transceiver can be reduced, thereby reducing the impact of electromagnetic interference on the operation of the optical transceiver.

[0023] According to an embodiment of the present invention, the filter capacitor can be packaged into a smaller housing to reduce the overall size of the optical transceiver and even reduce the corresponding parasitic capacitance. By reducing the size of one or more filter capacitors, the energy of the radiated leakage of electromagnetic interference can be reduced.

[0024] Please refer to Figure 1 ,in Figure 1 FIG. 1 is a schematic diagram of an optical transceiver according to an embodiment of the present invention. Figure 1As shown, the optical transceiver 1 may include a printed circuit board 10, a transceiver module 11, a plurality of filter capacitors 12, and a noise absorber 13. The printed circuit board 10 may be provided with a plurality of gold fingers 101 and a plurality of signal lines 102. Each of the plurality of gold fingers 101 is connected to one of the plurality of signal lines 102.

[0025] The transceiver module 11 may include an optical transmitter and an optical receiver. The transceiver module 11 and the plurality of filter capacitors 12 may be disposed on a printed circuit board 10. The signal line 102 may also be disposed inside the printed circuit board 10. Each of the plurality of filter capacitors 12 is located on one of the plurality of signal lines 102. For example, the filter capacitor 12 may be an alternating current (AC) coupling capacitor or a direct current (DC) coupling capacitor. For example, the filter capacitor 12 may be a silicon capacitor and may be applicable to the signal line 102 with a signal transmission rate ranging from 56 GBaud to 112 GBaud. When the filter capacitor 12 is placed on the signal line 102, the filter capacitor 12 may have a low bandwidth insertion loss, thereby reducing power consumption. Further, the filter capacitor 12 may be packaged to have a smaller housing to reduce the overall size of the optical transceiver 1 and even reduce the corresponding parasitic capacitance. Further, the filter capacitor 12 may have a high capacitance value.

[0026] Each of the plurality of signal lines 102 may connect one of the plurality of gold fingers 101 and the transceiver module 11. For example, a signal line 102 may connect the transceiver module 11 to a filter capacitor 12 and further connect the filter capacitor 12 to the corresponding gold finger 101.

[0027] It should be noted that, in addition to the transceiver module 11 and the filter capacitor 12, the optical transceiver 1 may include other electronic components disposed on the printed circuit board 10. Figure 1 The number and arrangement of the filter capacitors 12 , gold fingers 101 , and signal lines 102 shown are exemplary.

[0028] Please refer to Figure 1 and Figure 2 ,in Figure 2 A cross-sectional view of a printed circuit board, filter capacitors and noise absorbers is shown. Figure 2 As shown, the noise absorber 13 covers at least one surface of the filter capacitor 12, and the at least one surface is opposite to the printed circuit board 10. Figure 2Taking the two filter capacitors 12 shown as an example, the noise absorber 13 may cover one surface of each filter capacitor 12. In other words, the noise absorber 13 may be in direct contact with the surface of the filter capacitor 12. Figure 2 As shown, the surface of the filter capacitor 12 covered by the noise absorber 13 may be opposite to the surface of the filter capacitor 12 contacting the printed circuit board 10. In addition, the noise absorber 13 may cover multiple surfaces of the filter capacitor 12. For example, the noise absorber 13 may cover all other surfaces of the filter capacitor 12 except for the surface contacting the printed circuit board 10.

[0029] By means of the noise absorber 13 , the electromagnetic interference on the optical transceiver 1 can be reduced, thereby reducing the influence of the electromagnetic interference on the operation of the optical transceiver.

[0030] like Figure 1 and Figure 2 As shown, the projection of the entire filter capacitor 12 along the arrangement direction D1 on the printed circuit board 10 can be located within the projection of the noise absorber 13 along the arrangement direction D1 on the printed circuit board 10. That is, the projection range of the noise absorber 13 is preferably larger than the projection range of the filter capacitor 12. The arrangement direction D1 is the arrangement direction of the plurality of filter capacitors 12 on the printed circuit board 10, and is particularly a direction perpendicular to the upper surface of the printed circuit board 10.

[0031] Figure 1 The noise absorber 13 is illustrated as being implemented in a longitudinal strip shape. However, in another implementation, the noise absorber 13 may include a plurality of sub-absorbers, wherein each sub-absorber covers a surface of one of the plurality of filter capacitors 12 relative to the printed circuit board 10. Therefore, the number of sub-absorbers is equal to the number of filter capacitors 12.

[0032] Please refer to Figure 3 ,in Figure 3 Another cross-sectional view of the printed circuit board, the filter capacitor and the noise absorber is shown. Alternatively, each sub-absorber 130 of the noise absorber 13 may further cover one or more side surfaces of each filter capacitor 12. The extension direction of the side surface is substantially perpendicular to the upper surface of the printed circuit board 10 and parallel to the setting direction D1.

[0033] The material of the noise absorber 13 may include nickel, silicon and iron, wherein the weight percentage of nickel is 37% to 42%, the weight percentage of silicon is 15% to 25%, and the weight percentage of iron is 38% to 43%.

[0034] Please refer to Table 1 below, which shows the test results of electromagnetic interference leakage of a general optical transceiver (Case 1) and an optical transceiver using the noise absorber as described above. Specifically, for Case 1, the optical transceiver does not have a noise absorber. For Case 2, the optical transceiver has Figure 1 and Figure 2 The structure shown includes a noise absorber, and the material of the noise absorber includes nickel, silicon and iron, wherein the weight percentages of nickel, silicon and iron are as described above.

[0035] Table 1 shows the test parameters of carrier frequency, field strength level, field strength limit and test distance. The average type margin of case 2 is 4.46 dB higher than that of case 1, indicating that the optical transceiver (case 2) including the noise absorber can effectively reduce electromagnetic interference.

[0036] Table 1

[0037]

[0038] In addition, the size of one of the filter capacitors 12 may be 01005 inches (i.e., the size is 0.4 millimeters (mm) × 0.2 mm × 0.2 mm), while the size of the other filter capacitors 12 may be 0402 inches (i.e., the size is 0.6 mm × 0.3 mm × 0.23 mm); or, the size of each filter capacitor 12 may be 01005 inches. Accordingly, by reducing the size of one or more filter capacitors 12, the energy of radiation leakage of electromagnetic interference can be reduced.

[0039] Please refer to the following Table 2, which shows the test results of electromagnetic interference leakage of an optical transceiver using a 0402-inch filter capacitor (Case 1) and an optical transceiver using a 01005-inch filter capacitor (Case 2). Specifically, for Case 1, the size of each filter capacitor of the optical transceiver is 0402 inches. For Case 2, the optical transceiver has Figure 1 and Figure 2 The architecture shown, and the size of the multiple filter capacitors is 01005 inches.

[0040] Table 2

[0041]

[0042] The test parameters of carrier frequency, field strength level, field strength limit and test distance are shown in Table 2. The average type difference of case 2 is 1.96 dB higher than that of case 1, indicating that case 2 effectively reduces electromagnetic interference.

[0043] In summary, the optical transceiver according to one or more embodiments of the present invention can reduce electromagnetic interference, thereby reducing the impact of electromagnetic interference on the operation of the optical transceiver.

Claims

1. An optical transceiver, characterized in that: Include: A printed circuit board is provided with a plurality of signal lines and a plurality of gold fingers, each of the plurality of gold fingers is connected to one of the plurality of signal lines; a transceiver module, disposed on the printed circuit board and connected to the plurality of signal lines; A plurality of filter capacitors, each of the plurality of filter capacitors being located on one of the plurality of signal lines; as well as A noise absorber covers at least one surface of the plurality of filter capacitors, and the at least one surface is opposite to the printed circuit board.

2. The optical transceiver according to claim 1, characterized in that: One of the plurality of filter capacitors has a size of 01005 inches.

3. The optical transceiver according to claim 1, wherein: Each of the plurality of filter capacitors is sized 01005 inches.

4. The optical transceiver according to claim 1, wherein: The material of the noise absorber includes nickel, silicon and iron.

5. The optical transceiver according to claim 4, characterized in that: The weight percentage of the nickel is 37% to 42%, the weight percentage of the silicon is 15% to 25%, and the weight percentage of the iron is 38% to 43%.

6. The optical transceiver according to claim 1, characterized in that: The projection of the entirety of the plurality of filter capacitors on the printed circuit board is located within the projection of the noise absorber on the printed circuit board.

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