A compact 50G PON device, 50G PON apparatus and 50G PON system

Abstract

The utility model discloses a kind of 50G PON devices and 50G PON device and 50G PON system of compact type, it is related to optical communication technical field, including parallel glass block, first reflector, second reflector, fifth optical filter and pedestal, parallel glass block has parallel first side and second side, which is provided with optical filter and public port, by optimizing the transmission path of optical signal and improving space utilization, improve the isolation of optical signal, realize the three of optical signal Three receiving, different optical signal is reflected after emitting from parallel glass block by first reflector and second reflector, realize accurate separation by different output direction, pedestal is used for bearing and supporting each structural member, by irregular design further reduce size, realize compact device, solve the existing 50G PON optical device structure redundancy, size is larger, the problem of lower optical signal isolation.

Description

Technical Field

[0001] This utility model relates to the field of optical communication technology, and more specifically, to a compact 50G PON device, 50G PON apparatus, and 50G PON system. Background Technology

[0002] For prior art, please refer to the appendix to the instruction manual. Figure 1 The first working component's transmitting optical path: After the three transmitting chips 62 emit beams, they are adjusted into parallel beams by collimating lenses 63 for transmission. Then, the parallel beams enter the first Z-BLOCK 64 for beam merging. The merged beams are then corrected by the first prism 65. The second working component's receiving optical path: The beam corrected by the first prism 65 is transmitted to the vertical beam splitter 72. The vertical beam splitter 72 transmits the beam to the second prism 73 for secondary correction. The second prism 73 then transmits the secondary-corrected beam to the second Z-BLOCK 74, which disperses the beam into three different wavelengths. The dispersed beams are focused and transmitted by the corresponding focusing lenses 75, and finally, the beams are received by the receiving chips 76. Specifically, the beam, after optical path correction by the first prism 65, is transmitted to the vertical beam splitter prism 72. The beam is then transmitted to the second prism 73 for secondary correction before entering the second Z-BLOCK 74 receiver. The second Z-BLOCK 74 splits the beam into three wavelengths: 1270nm, 1286nm, and 1310nm. The split beam then passes through the focusing lens 75 and is received by three receiving chips 76: a 10G APD at 1270nm, a 25G APD at 1286nm, and a 1.25G APD at 1310nm. This achieves "three-transmission, three-reception" beam transmission for the 50G PON optical device.

[0003] However, existing 50G PON optical devices arrange two Z-blocks side-by-side, resulting in a large overall size. While increasing the incident angle could reduce size, this would also increase the difficulty of coating and fail to meet the high isolation requirements. Therefore, existing 50G PON optical devices suffer from structural redundancy, large size, and lack a simple, compact design with high optical signal isolation. Utility Model Content

[0004] The present invention aims to overcome at least one of the defects of the prior art and provide a compact 50G PON device, 50G PON apparatus and 50G PON system to solve the problems of redundant structure, large size and low optical signal isolation of existing 50G PON optical devices.

[0005] The technical solution adopted by this utility model is a compact 50G PON device, including a parallel glass block. The parallel glass block has a first side and a second side. The upper half of the first side is provided with a first filter and a third filter. The upper half of the second side is provided with a common port, which is opposite to the first filter. The lower half of the second side is provided with a second filter and a fourth filter. The transmitted signal enters from the first filter and exits through the common port. The received signal enters from the common port, is reflected by the first filter opposite to the common port, and is then reflected to the second filter. The received signal includes a first optical signal, a second optical signal, and a third optical signal. The first optical signal exits through the second filter. The second and third optical signals are reflected by the second filter to the third filter. The second optical signal exits through the third filter. The third optical signal is reflected by the third filter to the fourth filter and then exits through the fourth filter.

[0006] In this scheme, the parallel glass block provides a stable optical transmission medium for transmitting transmitted signals and separating received signals into three optical signals, ensuring the optical signals can be transmitted along a predetermined optical path and guaranteeing the stability and accuracy of the optical path. The first and second sides are polished surfaces, preferably with a parallelism of <10″. The angle between the first or second side and the flat surface of the parallel glass block is within the range of 8°±0.5°. The first and third filters are arranged side-by-side in the upper half of the first side. The common port is opposite to the first and third filters and is arranged in the upper half of the second side. The second and fourth filters are arranged side-by-side in the lower half of the second side. The common port is used to transmit transmitted and received signals, and the first filter is used to transmit transmitted signals and reflect received signals. The second filter reflects the second and third optical signals and transmits the first optical signal; the third filter reflects the third optical signal and transmits the second optical signal; and the fourth filter transmits the third optical signal. The second, third, and fourth filters are coated with bandpass films for selectively transmitting optical signals and isolating stray signals, achieving stable optical signal transmission, improving optical signal isolation, meeting high-precision signal processing requirements, improving optical signal transmission efficiency, and reducing losses. Preferably, the second, third, and fourth filters include a substrate, a high-refractive-index layer, and a low-refractive-index layer, with the high-refractive-index layer and low-refractive-index layer alternately deposited on the substrate. The ingenious arrangement of filters on parallel glass blocks achieves precise transmission and separation of optical signals, reducing size and improving isolation.

[0007] Furthermore, it also includes a first reflector, which is positioned opposite and spaced apart from the second and fourth filters. The first reflector has at least two reflective surfaces, the first reflective surface being used to reflect the first optical signal and the second reflective surface being used to reflect the third optical signal.

[0008] The first and second reflective surfaces are coated with high-reflectivity films to separate the output paths of the first and third optical signals, allowing for simultaneous output of both signals. This reduces the number of components, thereby minimizing the overall size of the device. Simultaneously, changing the output direction of the optical signals facilitates the layout of the receiving components. The spacing also helps reduce crosstalk between the optical signals, improving isolation and transmission efficiency. The first optical signal, emitted from the second filter, reaches the first reflective surface and is reflected before being output. The third optical signal, emitted from the fourth filter, reaches the second reflective surface and is reflected before being output. This solves the spatial layout problem after the optical signals are separated. The first reflector prevents interference between the receiving components and the optical path, improving compactness.

[0009] Furthermore, the first reflective surface is perpendicular to the second reflective surface.

[0010] The first and second reflective surfaces are perpendicular, facilitating processing and allowing for precise control of the reflection directions of the first and third optical signals. This reduces the impact of assembly tolerances on optical signal transmission. Preferably, the first reflector is square-shaped, with the high-reflectivity coating on the first reflective surface having an incident angle of 37°±1° and a required R>99.7%@1250~1360nm. The high-reflectivity coating on the second reflective surface has an incident angle of 53°±1°, also requiring R>99.7%@1250~1360nm. The first and second reflective surfaces ensure that the output paths of the first and third optical signals are opposite, minimizing mutual interference, improving isolation, and enhancing signal separation accuracy.

[0011] Furthermore, it also includes a second reflector and a fifth filter. The second reflector is opposite to and spaced apart from the third filter to reflect the second optical signal to the fifth filter. The fifth filter is disposed below the second reflector to filter the second optical signal.

[0012] The second reflector is coated with a high-reflectivity film to reflect the second optical signal, refracting the light path of the second optical signal perpendicularly, reducing the transmission distance and lateral dimensions, facilitating the layout of the receiving components, improving isolation, increasing optical signal transmission efficiency, and reducing losses. Preferably, the second reflector is a 45-degree parallelogram structure with a processing angle of 45°±0.1°, and its high-reflectivity film incident angle is 45°±2°, with a requirement of R>99.7%@1250~1360nm. The fifth filter is used to increase the isolation of the second optical signal, remove stray light or interference signals, and improve the purity and quality of the second optical signal. After the second optical signal is emitted from the third filter, it reaches the high-reflectivity film of the second reflector, is reflected by the second reflector to the fifth filter, and is output after being filtered by the fifth filter, further optimizing the optical signal transmission process and ensuring the accuracy and quality of the optical signal.

[0013] Furthermore, it also includes a base for supporting the parallel glass block, the first reflector, the second reflector, and the fifth filter.

[0014] The base provides a mechanical bearing platform to ensure the stability of the structural components it supports, improve the reliability of the device, and support the parallel glass block, the first reflector, the second reflector, and the fifth filter.

[0015] Furthermore, the base is formed by cutting a rectangle at two diagonal angles, with one angled surface being larger than the other. The base is divided into a left area, a middle area, and a right area, with the angled surfaces located in the left and right areas respectively. The left area is equipped with the second reflector and the fifth filter, the middle area is equipped with the parallel glass block, and the right area is equipped with the first reflector. The transmitted signal enters from the flat surface of the left area, passes through the parallel glass block, and exits from the angled surface of the right area. The received signal enters from the angled surface of the right area and is separated into three optical signals by the parallel glass block. The first optical signal exits from the angled surface of the right area, the second optical signal exits from the angled surface of the left area, and the third optical signal has the opposite output direction to the first optical signal and exits from the flat surface of the right area.

[0016] The base has a hexagonal structure, formed by beveling a rectangle at two opposite corners, with one bevel larger than the other. This bevel design integrates multiple optical paths, improving space utilization and enabling miniaturized optical devices. It also enhances optical signal transmission efficiency and reduces losses. Based on the base's partitions, the second reflector and fifth filter are installed in the left partition, the parallel glass block in the middle partition, and the first reflector in the right partition. The flat surface of the left partition transmits the transmitted signal to the parallel glass block, while the beveled surface outputs the second optical signal to the receiving component. The beveled surface of the right partition transmits the received signal to the parallel glass block and outputs the first optical signal. The flat surface of the right partition outputs the third optical signal, which has the opposite output direction to the first optical signal. This design helps reduce the device's size, making the overall structure more compact. It also allows for an orderly distribution of optical paths on the base, ensuring accurate transmission of optical signals between different structural components, facilitating optical signal input and output, and improving the accuracy and reliability of beam splitting.

[0017] Furthermore, the common port is coated with an air-reflective coating.

[0018] The common port is coated with an air-reflective coating to form a high-transmittance film surface, which reduces the reflection loss of the received signal at the interface between the common port and the air, enhances the transmission strength of the received signal, and improves the accuracy and sensitivity of the device. Preferably, the air-reflective coating has R<0.25%@1240~1360nm@AOI: 8°±2°.

[0019] Furthermore, an anti-reflective coating is deposited at the junction of the first filter, the second filter, the third filter, and the fourth filter with the parallel glass block.

[0020] Preferably, the antireflective coating has R > 10% @ 380~780nm and R < 0.25% @ 1240~1360nm @ AOI: 5.3° ± 1°, to form a reflectivity greater than 5% in the visible light range, reducing the reflection and scattering of light signals at the connection between the filter and the parallel glass block, improving the transmission efficiency and quality of light signals, increasing transmittance, and enhancing the accuracy and sensitivity of the device. Optionally, the antireflective coating can be deposited on the entire surface of the first side and the lower half of the second side.

[0021] Another objective of this invention is to provide a 50G PON device, comprising the aforementioned compact 50G PON device, a transmitting component, and three receiving components, wherein the transmitting component is used to transmit the transmitted signal, and the three receiving components are used to receive a first optical signal, a second optical signal, and a third optical signal, respectively.

[0022] The transmitting component inputs the transmitted signal into the compact 50G PON device. After processing by the compact 50G PON device, the three receiving components respectively receive the three separated optical signals, realizing the complete process of optical signal transmission, processing, and reception. The 50G PON device transforms the compact 50G PON device into a functional module, supporting three-way transmission and reception of optical signals, with high space utilization, adapting to the miniaturization requirements of different devices, high optical signal isolation, wide applicability, and high optical signal processing efficiency.

[0023] Another objective of this invention is to provide a 50G PON system, wherein two 50G PON devices are respectively provided at both ends, the two 50G PON devices are paired and connected by optical fiber, and the receiving end of one 50G PON device corresponds to the transmitting end of the other, and its transmitting end corresponds to the receiving end of the other.

[0024] By pairing two 50G PON devices and connecting them with optical fibers, bidirectional transmission of various optical signals between the two 50G PON devices is realized, forming a complete 50G PON bidirectional communication link and optical communication system. The 50G PON system has the advantages of compact structure, high optical signal isolation and strong optical signal processing capability, meeting the needs of high-speed optical communication and large-scale efficient data transmission.

[0025] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. Compact structure: Through the rational layout of parallel glass blocks, mirrors and filters, as well as the irregular design of the base, redundant combination of multiple optical components in the prior art is avoided, the size of the device is reduced, and it is conducive to integration and miniaturization applications.

[0026] 2. Optimized optical path design and high isolation: By integrating multiple filters on a parallel glass block and designing specific reflection and transmission paths, the transmission path of optical signals is effectively controlled, achieving efficient separation of multiple optical signals, high optical signal isolation, and improving the stability and reliability of the device.

[0027] 3. Reduced coating difficulty, easier production and assembly: The number of discrete components is reduced, and the coating is concentrated on the surface of parallel glass blocks, which simplifies the coating and assembly process, reduces production costs and manufacturing difficulty, and improves the yield of devices.

[0028] 4. Strong optical signal processing capability and high efficiency: It can effectively separate the received signal into three different optical signals, accurately process and transmit the transmitted and received signals, realize efficient and stable optical communication, and meet the needs of 50G PON devices or systems for high-speed optical communication and large-scale efficient data transmission. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the background technology.

[0030] Figure 2 This is a schematic diagram of the structure of Embodiment 1 of this utility model.

[0031] Figure 3 This is a schematic diagram of the partitioning of the base in Embodiment 1 of this utility model.

[0032] Figure 4 This is a schematic diagram of the structure of Embodiment 2 of this utility model.

[0033] Figure 5 This is a structural schematic diagram of Embodiment 3 of the present invention.

[0034] Explanation of reference numerals in the attached diagram: Parallel glass block 100, first filter 110, second filter 120, third filter 130, fourth filter 140, common port 150, first side surface 160, second side surface 170, first reflector 200, first reflective surface 210, second reflective surface 220, second reflector 300, fifth filter 400, base 500, left area 510, middle area 520, right area 530, flat surface 540, beveled surface 550, 50G PON device 600, transmitting component 610, receiving component 620, 50G PON system 700. Detailed Implementation

[0035] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this invention. To better illustrate the following embodiments, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0036] In the description of this utility model, it should be noted that the terms "upper," "lower," 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. These terms are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] Example 1 like Figure 2As shown, this embodiment is a compact 50G PON device, including a parallel glass block 100, a first reflector 200, a second reflector 300, a fifth filter 400, and a base 500.

[0038] The parallel glass block 100 has a parallel first side 160 and a second side 170, both of which are polished surfaces. Preferably, the parallelism is <10″. The angle between the first side 160 or the second side 170 and the flat surface 540 of the parallel glass block 100 is within the range of 8°±0.5°. The upper half of the first side 160 is provided with a first filter 110 and a third filter 130. The upper half of the second side 170 is provided with a common port 150, which is opposite to the first filter 110. The lower half of the second side 170 is provided with a second filter 140. The second filter 120 and the fourth filter 140 are respectively coated with a bandpass filter film of 1270±20nm, the third filter 130 with a bandpass filter film of 1310±20nm, and the fourth filter 140 with a bandpass filter film of 1286±2nm, to achieve precise separation and high isolation of optical signals. The second filter 120, the third filter 130 and the fourth filter 140 include a substrate, a high refractive index layer and a low refractive index layer, which are alternately coated on the substrate. Preferably, the high refractive index layer is made of tantalum pentoxide and the low refractive index layer is made of silicon dioxide.

[0039] An air-reflective coating is deposited on the upper half of the second side 170 to form a high-transmittance film surface, reducing the reflection loss of the received signal at the interface between the common port 150 and the air, and improving the accuracy and sensitivity of the device. Preferably, the air-reflective coating has R < 0.25% @ 1240~1360nm @ AOI: 8° ± 2°. An adhesive-coated anti-reflective coating is deposited on the lower half of the first side 160 and the second side 170. Preferably, R > 10% @ 380~780nm, R < 0.25% @ 1240~1360nm @ AOI: 5.3° ± 1°, to form a reflectivity greater than 5% in the visible light range, reducing the reflection and scattering of the optical signal at the connection between the filter and the parallel glass block 100, improving the transmission efficiency and quality of the optical signal, and enhancing the accuracy and sensitivity of the device.

[0040] In this embodiment, the transmitted signals (solid arrows) are 1342±2nm, 1490±10nm and 1577±3nm, and the received signals (dashed arrows) include a first optical signal of 1270±20nm, a second optical signal of 1286±2nm and a third optical signal of 1310±20nm. The transmitted signal enters from the first filter 110 and exits from the common port 150. The received signal enters from the common port 150, is reflected by the first filter 110 opposite to the common port 150, and is then reflected to the second filter 120. The first optical signal is then reflected by the second filter 120 and exits. The second and third optical signals are reflected by the second filter 120 and then to the third filter 130. The second optical signal is then reflected by the third filter 130 and exits. The third optical signal is then reflected by the third filter 130 and exits through the fourth filter 140. This optimizes the optical path transmission path, reduces optical path loss, and improves the transmission efficiency of the optical signal.

[0041] The first reflector 200 is positioned opposite and spaced apart from the second filter 120 and the fourth filter 140. The first reflector 200 has at least two reflective surfaces. Preferably, the first reflective surface 210 is perpendicular to the second reflective surface 220. The first reflector 200 is square, precisely controlling the reflection directions of the first and third optical signals and reducing the impact of assembly tolerances on optical signal transmission. The first reflective surface 210 reflects the first optical signal, and the second reflective surface 220 reflects the third optical signal. Both the first and second reflective surfaces 210 and 220 are coated with high-reflectivity films to separate the output paths of the first and third optical signals. Preferably, the incident angle of the high-reflectivity film on the first reflective surface 210 is 37°±1°, with a requirement R>99.7%@1250~1360nm, and the incident angle of the high-reflectivity film on the second reflective surface 220 is 53°±1°, with a requirement R>99.7%@1250~1360nm. The first reflective surface 210 and the second reflective surface 220 output two kinds of optical signals simultaneously, which can reduce the number of components and improve space utilization. At the same time, they can change the output direction of the optical signals, reduce crosstalk between optical signals, and improve isolation and transmission efficiency.

[0042] The second reflector 300 and the fifth filter 400 are positioned opposite each other and spaced apart. The second reflector 300 reflects the second optical signal to the fifth filter 400. The second reflector 300 is coated with a high-reflectivity film to refract the light of the second optical signal perpendicularly, reducing the transmission distance, reducing the lateral dimension, and improving isolation. Preferably, the second reflector 300 has a 45-degree parallelogram structure with a processing angle of 45°±0.1° and an incident angle of 45°±2° for its high-reflectivity film. The required performance is R>99.7%@1250~1360nm. The fifth filter 400 is positioned below the second reflector 300 to filter the second optical signal, improving its purity and quality.

[0043] like Figure 3 As shown, the base 500 is formed by beveling a rectangle at two opposite corners, with one bevel 550 being larger than the other, to achieve miniaturized optical devices while improving optical signal transmission efficiency and reducing losses. The base 500 supports the parallel glass block 100, the first reflector 200, the second reflector 300, and the fifth filter 400. The base 500 can be divided into a left area 510, a middle area 520, and a right area 530. The bevel 550s are located in the left area 510 and the right area 530, respectively. The left area 510 is equipped with the second reflector 300 and the fifth filter 400, the middle area 520 is equipped with the parallel glass block 100, and the right area 530 is equipped with the first reflector 200. The transmitted signal enters from the flat surface 540 of the left region 510, passes through the parallel glass block 100, and exits from the oblique surface 550 of the right region 530. The received signal enters from the oblique surface 550 of the right region 530 and is separated into three optical signals by the parallel glass block 100. The first optical signal exits from the oblique surface 550 of the right region 530, the second optical signal exits from the oblique surface 550 of the left region 510, and the third optical signal is output in the opposite direction to the first optical signal and exits from the flat surface 540 of the right region 530. This helps to reduce the size of the device and improve the accuracy and reliability of beam splitting.

[0044] In this embodiment, the transmission path of the optical signal is as follows: Transmitted signal path: The transmitted signal enters from the flat surface 540 of the left area 510 of the base 500 to the first filter 110, is transmitted in a straight line through the first filter 110 to the common port 150, and is output from the common port 150 to the oblique surface 550 of the right area 530.

[0045] Received signal path: The received signal enters from the oblique surface 550 of the right area 530 to the common port 150, and is transmitted in a straight line through the common port 150 to the first filter 110. The first filter 110 reflects the received signal to the second filter 120 for separation.

[0046] The first optical signal is emitted from the second filter 120 to the first reflecting surface 210 of the first reflecting mirror 200, and after being reflected by the first reflecting surface 210, it is output to the oblique section 550 of the right area 530.

[0047] The second optical signal is reflected from the second filter 120 to the third filter 130, then emitted through the third filter 130 to the second reflector 300, reflected by the second reflector 300 to the fifth filter 400 for filtering, and emitted from the fifth filter 400 to the oblique surface 550 of the left area 510 for output.

[0048] The third optical signal is reflected from the second filter 120 to the third filter 130, then reflected by the third filter 130 to the fourth filter 140, and emitted from the fourth filter 140 to the second reflecting surface 220 of the first reflecting mirror 200. After being reflected by the second reflecting surface 220, it is output to the flat surface 540 of the right area 530.

[0049] Example 2 like Figure 4 As shown, this embodiment is a 50G PON device 600, including the compact 50G PON device from Embodiment 1, a transmitting component 610, and three receiving components 620. The transmitting component 610 transmits the transmitted signal, and the three receiving components 620 respectively receive a first optical signal, a second optical signal, and a third optical signal. The transmitting component 610 inputs the transmitted signal into the compact 50G PON device. After processing by the compact 50G PON device, the three receiving components 620 respectively receive the three separated optical signals, realizing the complete process of optical signal transmission, processing, and reception. This Embodiment 2 transforms the compact 50G PON device into a functional module, supporting three-way transmission and reception of optical signals, with high space utilization, adapting to the miniaturization requirements of different devices, high optical signal isolation, wide applicability, and high optical signal processing efficiency.

[0050] Example 3 like Figure 5 As shown, this embodiment is a 50G PON system 700, with 50G PON devices 600 of Embodiment 2 respectively set at both ends. The two 50G PON devices 600 are paired and connected by optical fiber. The receiving end of one 50G PON device 600 corresponds to the transmitting end of the other, and its transmitting end corresponds to the receiving end of the other. This realizes bidirectional transmission of multiple optical signals between the two 50G PON devices 600, forming a complete 50G PON bidirectional communication link and optical communication system. This Embodiment 3 has the advantages of compact structure, high optical signal isolation and strong optical signal processing capability, meeting the needs of high-speed optical communication and large-scale efficient data transmission.

[0051] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the technical solution of this utility model, and are not intended to limit the specific implementation of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the claims of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A compact 50G PON device, characterized in that, The device includes a parallel glass block with a first side and a second side. The upper half of the first side has a first filter and a third filter, and the upper half of the second side has a common port opposite to the first filter. The lower half of the second side has a second filter and a fourth filter. A transmitted signal enters from the first filter and exits through the common port. A received signal enters from the common port, is reflected by the first filter opposite to the common port, and is then reflected to the second filter. The received signal includes a first optical signal, a second optical signal, and a third optical signal. The first optical signal exits through the second filter, and the second and third optical signals are reflected by the second filter to the third filter. The second optical signal exits through the third filter, and the third optical signal is reflected by the third filter to the fourth filter and then exits through the fourth filter.

2. The compact 50G PON device according to claim 1, characterized in that, It also includes a first reflector, which is positioned opposite and spaced apart from the second and fourth filters. The first reflector has at least two reflective surfaces, the first reflective surface being used to reflect the first optical signal and the second reflective surface being used to reflect the third optical signal.

3. The compact 50G PON device according to claim 2, characterized in that, The first reflecting surface is perpendicular to the second reflecting surface.

4. The compact 50G PON device according to claim 2, characterized in that, It also includes a second reflector and a fifth filter. The second reflector and the fifth filter are opposite to each other and spaced apart, and are used to reflect the second optical signal to the fifth filter. The fifth filter is disposed below the second reflector and is used to filter the second optical signal.

5. The compact 50G PON device according to claim 4, characterized in that, It also includes a base for supporting the parallel glass block, the first reflector, the second reflector, and the fifth filter.

6. The compact 50G PON device according to claim 5, characterized in that, The base is formed by cutting a rectangle at two diagonal angles, with one angled surface being larger than the other. The base is divided into a left area, a middle area, and a right area, with the angled surfaces located in the left and right areas respectively. The left area is equipped with a second reflector and a fifth filter, the middle area is equipped with the parallel glass block, and the right area is equipped with the first reflector. The transmitted signal enters from the flat surface of the left area, passes through the parallel glass block, and exits from the angled surface of the right area. The received signal enters from the angled surface of the right area and is separated into three optical signals by the parallel glass block. The first optical signal exits from the angled surface of the right area, the second optical signal exits from the angled surface of the left area, and the third optical signal has the opposite output direction to the first optical signal and exits from the flat surface of the right area.

7. The compact 50G PON device according to claim 1, characterized in that, The common port is coated with an air-reflective coating.

8. The compact 50G PON device according to claim 1, characterized in that, An anti-reflective coating is deposited at the junction of the first filter, the second filter, the third filter, and the fourth filter with the parallel glass block.

9. A 50G PON device, characterized in that, The device includes a compact 50G PON device as described in any one of claims 1 to 8, a transmitting component, and three receiving components, wherein the transmitting component is used to transmit the transmitted signal, and the three receiving components are used to receive a first optical signal, a second optical signal, and a third optical signal, respectively.

10. A 50G PON system, characterized in that, The two ends are respectively provided with the 50G PON device as described in claim 9, the two 50G PON devices are arranged in pairs and connected by optical fiber, the receiving end of one 50G PON device corresponds to the transmitting end of the other, and its transmitting end corresponds to the receiving end of the other.

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