A high-isolation narrow-band demultiplexing assembly
By designing a high-isolation narrowband wavelength division multiplexing (WDM) component and employing multi-layer filters and prism structures, the compatibility issues between 50G PON and GPON and 10G PON networks were resolved, achieving high isolation and low-loss optical signal separation, and supporting network upgrades.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUHAN HUAGONG GENUINE OPTICS TECH CO LTD
- Filing Date
- 2025-05-27
- Publication Date
- 2026-06-26
AI Technical Summary
Existing fiber optic access technologies cannot meet the high wavelength rate requirements of 5G, 8K video and cloud computing, and 50G PON networks need to be compatible with GPON and 10G PON networks. Existing components cannot effectively achieve signal wavelength separation and high isolation for the coexistence of the three modes. In particular, the 50G uplink wavelength is only 2nm away from the GPON uplink wavelength, resulting in severe signal crosstalk.
A high-isolation narrowband wavelength division multiplexing (WDM) component is designed, employing multi-layer filters and prism structures, and assembled using optical glass and optical path adhesive to achieve optical signal separation for 50G PON, 10G PON, and GPON. Parallel optical path design and special optical path structure are used to reduce energy loss and improve isolation.
It achieves high isolation narrowband wavelength division multiplexing with 50G PON tri-mode coexistence, reduces energy loss, ensures the stability and reliability of optical path transmission, and meets network upgrade requirements.
Smart Images
Figure CN224417063U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of optical communication technology. More specifically, this utility model relates to a high-isolation narrowband wavelength division multiplexing (WDM) component. Background Technology
[0002] With the continuous development of fiber optic access technology, the rates of traditional PON (GPON / 10G PON) can no longer meet the demands of 5G, 8K video, cloud computing, and other technologies. 50G PON, as the next-generation optical access technology, supports higher wavelength rates. To ensure compatibility with existing ODN (Optical Distribution Network) architectures and achieve smooth network upgrades, 50G PON needs to be compatible with both GPON and 10G PON networks, i.e., tri-mode coexistence. This requires designing a narrowband wavelength division multiplexing (WDM) component to address the signal wavelength separation issue in tri-mode coexistence WDM scenarios. Furthermore, according to protocol standards, the uplink wavelength for 50G is 1284~1288nm, for GPON it is 1290~1330nm, and for 10G PON it is 1260~1280nm. It can be seen that the 50G uplink wavelength of 1288nm is only 2nm away from the GPON uplink wavelength of 1290nm, and the isolation between adjacent channels in 50G PON needs to be greater than 30dB. Therefore, a high-isolation narrowband wavelength division multiplexing component needs to be designed to meet the requirements of 50G… PON uplink channel narrowband wavelength division multiplexing, high isolation, low insertion loss, and realizes 50G PON three-mode integration. Utility Model Content
[0003] The purpose of this invention is to provide a high-isolation narrowband demultiplexing component that achieves narrowband demultiplexing, high isolation, and low loss, in order to support more flexible wavelength allocation and network upgrades.
[0004] To achieve these objectives and other advantages according to the present invention, a high-isolation narrowband demultiplexing assembly is provided, comprising:
[0005] An optical channel having an inlet light port and at least three outlet light ports;
[0006] The first filter receives the incident light beam at the light inlet;
[0007] The second filter is located on the reflected light path of the first filter;
[0008] The fourth filter receives the reflected light beam from the second filter;
[0009] The first filter, the second filter, and the fourth filter are respectively disposed at the three light outlets of the optical channel.
[0010] Furthermore, the high-isolation narrowband demultiplexing component further includes:
[0011] An optical glass, wherein the first filter is disposed at one end of the optical glass in a first direction, and the other end of the optical glass in the first direction has a reflective surface corresponding to the first filter;
[0012] A first filtering unit and a second filtering unit are respectively disposed at both ends of the optical glass in a second direction, the second direction being perpendicular to the first direction. The first filtering unit has a second filter and the second filtering unit has a fourth filter.
[0013] Furthermore, the high-isolation narrowband demultiplexing component further includes:
[0014] A prism, which is connected to the optical glass, receives the reflected light beam from the fourth filter.
[0015] Furthermore, in the high isolation narrowband wavelength division multiplexing assembly, the first filtering unit includes a second filter and at least one third filter arranged sequentially along a first direction, with the second filter located near the other end of the optical glass.
[0016] Furthermore, in the high isolation narrowband wavelength division multiplexing assembly, the second filtering unit includes a fourth filter and at least one third filter arranged sequentially along a first direction, with the fourth filter located near one end of the optical glass.
[0017] Furthermore, in the high isolation narrowband demultiplexing component, the third filter and the second filter are the same filter.
[0018] Furthermore, in the aforementioned high-isolation narrowband demultiplexing component, both the first filtering unit and the second filtering unit include two third filters.
[0019] Furthermore, in the aforementioned high-isolation narrowband wavelength division multiplexing assembly, the first filter, the second filter, the third filter, the fourth filter, and the prism are all bonded to the optical glass using optical path adhesive.
[0020] Furthermore, in the aforementioned high-isolation narrowband wavelength division multiplexing assembly, the other end of the optical glass in the first direction is provided with a chamfer, and a reflective film is coated at the chamfer to form the reflective surface.
[0021] Furthermore, in the aforementioned high-isolation narrowband wavelength division multiplexing (WDM) assembly, the angle between the incident light path of the WDM assembly and the first direction is 8°.
[0022] The beneficial effects of this utility model are:
[0023] 1. The high isolation narrowband wavelength division multiplexing component of this utility model has a highly integrated structure. Under the premise of ensuring that the optical path does not block light and the structure is reliable, the structure has been designed with a small volume through optical simulation to meet the technical requirements of 50G PON tri-mode coexistence.
[0024] 2. The optical path transmission method of the high isolation narrowband wavelength division component of this utility model is a parallel light design, which is beneficial for narrowband wavelength division of multi-channel optical paths and reduces energy loss;
[0025] 3. The high isolation narrowband wavelength division multiplexing component of this utility model adopts a special optical path structure design and has a high degree of structural integration, realizing narrowband wavelength division with a 2nm interval from 1288nm to 1290nm and a high isolation design.
[0026] 4. The filter, prism and optical glass of the high isolation narrowband wavelength division multiplexing component of this utility model are assembled and bonded with optical path adhesive, which can effectively reduce the energy loss of optical path transmission.
[0027] 5. The outgoing light from the first, second, and third receiving channels of the high-isolation narrowband wavelength division multiplexing assembly of this invention is perpendicular to the incident light, which is beneficial for optical path reception and detection.
[0028] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description
[0029] Figure 1 This is a schematic diagram of the high isolation narrowband demultiplexer assembly described in this utility model;
[0030] Figure 2 This is a schematic diagram of the optical path operation of the high isolation narrowband wavelength division multiplexing component described in this utility model;
[0031] Figure 3 This is a schematic diagram of the optical path structure of the first receiving channel described in this utility model;
[0032] Figure 4 This is a schematic diagram of the optical path structure of the second receiving channel described in this utility model;
[0033] Figure 5 This is a schematic diagram of the optical path structure of the third receiving channel described in this utility model.
[0034] The reference numerals in the attached figures are as follows:
[0035] 1. Optical glass; 2. First filter; 3. Second filter; 4. Third filter a; 5. Third filter b; 6. Third filter c; 7. Third filter d; 8. Fourth filter; 9. Prism. Detailed Implementation
[0036] The present invention will be further described in detail below with reference to the embodiments, so that those skilled in the art can implement it based on the description.
[0037] like Figures 1-5 As shown, an embodiment of this utility model provides a high-isolation narrowband demultiplexing component, comprising:
[0038] Optical glass 1, one end of which is provided with a first filter 2 for wavelength division of 50G PON tri-mode transmission wavelength and reception wavelength, and the other end is provided with a chamfered corner, wherein a reflective film is coated at the chamfered corner to form a reflective surface;
[0039] The first filter unit and the second filter unit are respectively disposed at both ends of the optical glass 1 in the second direction. The first filter unit is located on the reflected light path of the reflective surface. Both the first filter unit and the second filter unit are provided with a plurality of light outlets at equal intervals along the first direction.
[0040] The first filtering unit includes a second filter 3, a third filter b5, and a third filter d7 arranged sequentially along a first direction. The second filter 3 is located near the other end of the optical glass 1 and forms the outlet of the first receiving channel. The second filtering unit includes a fourth filter 8, a third filter a4, and a third filter c6 arranged sequentially along the first direction. The fourth filter 8 is located near one end of the optical glass 1 and forms the outlet of the second receiving channel. The third filter is the same as the second filter 3.
[0041] Prism 9 is disposed at the exit of the third receiving channel so that the outgoing light of the third receiving channel is perpendicular to the incident light.
[0042] The optical glass 1, the first filter 2, and the first filter unit form a first receiving channel for transmitting and emitting light in the 1284~1288nm uplink band of 50G PON. The outlet of the first receiving channel is the light outlet of the first filter unit near the other end of the optical glass 1.
[0043] The optical glass 1, the first filter 2, the first filter unit, and the second filter unit form a second receiving channel for transmitting and emitting light in the 1260~1280nm uplink band of 10GPON. The outlet of the second receiving channel is the light outlet of the second filter unit near the end of the optical glass 1.
[0044] The optical glass 1, the first filter 2, the first filter unit, and the second filter unit form a third receiving channel for transmitting and emitting light in the 1290~1330nm uplink band of GPON. The outlet of the third receiving channel is located on the optical glass 1.
[0045] In this embodiment, the first filter 2 is used to transmit the wavelength of the 50G tri-mode optical device's transmitter and reflect the wavelength of the receiver, thereby achieving wavelength division between the 50G PON tri-mode transmitter and receiver. The second filter 3 is used to transmit the 1284~1288nm uplink light of the 50G PON and reflect the 1260~1280nm uplink light of the 10G PON and the 1290~1330nm uplink light of the GPON back into the optical glass 1 assembly, thereby achieving narrowband wavelength division of the first receiving channel. The third filters a4, b5, c6, and d7 are all used to transmit the 1284-1288nm uplink light from 50G PON. The 1260-1280nm uplink light from 10G PON and the 1290-1330nm uplink light from GPON are sequentially reflected into the optical glass 1 assembly. The 1284-1288nm light is reflected, filtered, and transmitted out through the optical path of optical glass 1. The light undergoes 5 transmissions, thereby reducing the optical crosstalk caused by the 1284-1288nm light received by 50G PON to the 1260-1280nm and 1290-1330nm light. This achieves a high-isolation narrowband wavelength division multiplexing design, with an isolation of over 45dB. The fourth filter 8 is used to transmit the 1260~1280nm uplink light from the 10G PON and reflect the 1290~1330nm uplink light from the GPON, thus achieving narrowband wavelength division between the second and third receiving channels. The prism 9 is used to adjust the optical path of the 1290~1330nm uplink light from the GPON, so that the direction of the outgoing light from the third receiving channel is perpendicular to the incident light of the narrowband wavelength division component.
[0046] Figure 2 This is a schematic diagram of the optical path operation in this embodiment, wherein the optical glass 1 is a square block. Figure 2 The longer side is the first direction, and the wider side is the second direction. The 50G PON system follows... Figure 2 Light rays are emitted from the horizontal direction to the other end of the optical glass 1, and the angle between the first direction and the horizontal direction is 8°.
[0047] like Figure 3 As shown, the 1284~1288nm light emitted by the 50G PON system is incident on the first receiving channel, passes through the optical glass 1, is reflected by the first filter 2, and then is reflected again by the reflective surface at the chamfered corner of the optical glass 1, and is transmitted vertically out through the second filter 3.
[0048] like Figure 4As shown, the 1260~1280nm light emitted by the 50G PON system is incident on the second receiving channel, passes through the optical glass 1, is reflected by the first filter 2, is reflected again by the reflective surface at the chamfered corner of the optical glass 1, and is then reflected sequentially by the second filter 3, the third filter a4, the third filter b5, the third filter c6 and the third filter d7 to the fourth filter 8 and transmitted vertically.
[0049] like Figure 5 As shown, the 1290~1330nm light emitted by the 50G PON system is incident on the optical glass 1, reflected by the first filter 2, reflected again by the reflective surface at the chamfered corner of the optical glass 1, and then reflected by the second filter 3, the third filter a4, the third filter b5, the third filter c6, the third filter d7 and the fourth filter 8 in sequence to be emitted vertically from the prism 9.
[0050] like Figure 2 As shown, the combined light of 1260~1280nm, 1284~1288nm, and 1290~1330nm is filtered, transmitted, reflected, and split into three independent light channels after passing through the wavelength division component, realizing a narrowband wavelength division design with high isolation for 50G PON tri-mode coexistence.
[0051] Preferably, in another embodiment of the present invention, the first filter 2, the second filter 3, the third filter, the fourth filter 8 and the prism 9 are all bonded to the optical glass 1 by optical path adhesive.
[0052] In this embodiment, optical glass 1 serves as the carrier for assembling and bonding various optical components. High-reliability optical adhesive is used to sequentially bond the first filter 2, the second filter 3, the third filter a4, the third filter b5, the third filter c6, the third filter d7, the fourth filter 8, and the prism 9 to the optical glass 1, ensuring a stable structure and reliability for the wave division component that meets industry requirements. During the assembly and bonding of the wave division component, real-time monitoring and testing of the optical path and beam spot can be performed using a beam quality analyzer to ensure assembly and bonding accuracy and performance.
[0053] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and embodiments shown and described herein.
Claims
1. A high-isolation narrow-band demultiplexing component, characterized by, include: An optical channel having an inlet light port and at least three outlet light ports; The first filter receives the incident light beam at the light inlet; The second filter is located on the reflected light path of the first filter; The fourth filter receives the reflected light beam from the second filter; The first filter, the second filter, and the fourth filter are respectively disposed at the three light outlets of the optical channel.
2. A high-isolation narrow-band demultiplexing component as claimed in claim 1, characterized in that Also includes: An optical glass, wherein the first filter is disposed at one end of the optical glass in a first direction, and the other end of the optical glass in the first direction has a reflective surface corresponding to the first filter; A first filtering unit and a second filtering unit are respectively disposed at both ends of the optical glass in a second direction, the second direction being perpendicular to the first direction. The first filtering unit has a second filter and the second filtering unit has a fourth filter.
3. A high-isolation narrow-band demultiplexer according to claim 2, wherein, Also includes: A prism, which is connected to the optical glass, receives the reflected light beam from the fourth filter.
4. A high-isolation narrow-band demultiplexer as claimed in claim 3, characterized in that The first filtering unit includes a second filter and at least one third filter arranged sequentially along a first direction, with the second filter located near the other end of the optical glass.
5. A high-isolation narrow-band demultiplexer as claimed in claim 4, characterized in that The second filtering unit includes a fourth filter and at least one third filter arranged sequentially along a first direction, wherein the fourth filter is located near one end of the optical glass.
6. A high-isolation narrow-band demultiplexer according to claim 5, wherein, The third filter is the same as the second filter.
7. A high-isolation narrow-band demultiplexer as claimed in claim 5, characterized in that Both the first and second filtering units include two third filter chips.
8. A high-isolation narrow-band demultiplexer as claimed in claim 5, characterized in that The first filter, the second filter, the third filter, the fourth filter, and the prism are all bonded to the optical glass with optical adhesive.
9. A high-isolation narrowband demultiplexing component as described in claim 2, characterized in that, The optical glass has a beveled corner at the other end in the first direction, and a reflective film is coated at the beveled corner to form the reflective surface.
10. A high-isolation narrowband demultiplexing component as described in claim 2, characterized in that, The angle between the incident light path of the wavelength division component and the first direction is 8°.