CN116346238A

CN116346238A - 50G passive optical network receiving end assembly

Info

Publication number: CN116346238A
Application number: CN202310379761.1A
Authority: CN
Inventors: 张佳伟
Original assignee: Suzhou Jialan Zhiyuan Electronic Technology Co ltd
Current assignee: Suzhou Jialan Zhiyuan Electronic Technology Co ltd
Priority date: 2023-04-11
Filing date: 2023-04-11
Publication date: 2023-06-27

Abstract

The invention discloses a 50G passive optical network receiving end component, which belongs to the field of optical networks, wherein a first photodiode and a second photodiode are respectively arranged on two opposite sides of a shell, a first reflector and a second reflector are respectively positioned at two ends of a wavelength division multiplexer, a lens is positioned between the wavelength division multiplexer and a receiving port, and light of 1342nm,1490nm and 1577nm entering from a transmitting port passes through the wavelength division multiplexer and the lens and then is emitted from the receiving port; light of 1270nm,1286nm and 1310nm entering from a receiving port enters a wavelength division multiplexer after being collimated by a lens, light of 1286nm is reflected to a first photodiode by a second reflector after being multiplexed by the wavelength division multiplexer, light of 1270nm and 1310nm is reflected to a second photodiode by the first reflector after being multiplexed by the wavelength division multiplexer, and the light is coupled with a receiving end and a transmitting end by the lens, so that the accuracy of angle offset of a receiving light path and a transmitting light path is improved, and the coupling efficiency and the yield of a client are improved; on the basis of realizing the single-fiber bidirectional function, the requirement of a 50GPON wavelength division multiplexing receiving end is met.

Description

50G passive optical network receiving end assembly

Technical Field

The invention relates to the field of optical fiber networks, in particular to a 50G passive optical fiber network receiving end component.

Background

Along with the development of the access network, the network speed is continuously improved, the development of the PON (passive optical network) is continuously upgraded from GPON to 10GPON to 50GPON, the ITU-T formally releases the 50G PON standard in 9 months of 2021 as the only standard of the next-generation PON after 10G PON, and the establishment of the 50GPON standard lays a foundation for the broadband service from gigabit to tera age; in the existing 10G PON network, in order to implement a single-fiber bidirectional scheme that a Combo PON is adopted, an OLT (optical line terminal) of the Combo PON is a four-port optical device, and two sets of transceiver devices are integrated in one optical device: 2.5G 1490nm laser of the traditional GPON, 10G 1577nm laser and 1270nm APD of 1310nm APD and XGPON are coupled to an output optical port by WDM multiplexing, and a single-fiber bidirectional function is realized by butterfly packaging; the emission end of the 50GPON standard is a laser with the wavelength of 1342nm,1490nm and 1577nm, and the receiving end of the 50GPON standard is a laser with the wavelength of 1270nm,1286nm and 1310nm, and the coaxial butterfly scheme of the Combo PON is adopted for packaging, so that the volume is large, the filter is increased, the assembly precision is poor, and the wavelength division multiplexing of 1286nm cannot be realized due to the large-angle incidence of the filter; the requirements of 50G PON are not satisfied.

Disclosure of Invention

In order to overcome the defects of the prior art, one of the purposes of the invention is to provide a 50G passive optical network receiving end component which has small volume, simple structure and high assembly precision and meets the requirements of a 50GPON wavelength division multiplexing receiving end.

One of the purposes of the invention is realized by adopting the following technical scheme:

a 50G passive optical network receiving end assembly, which comprises a shell, a transmitting port, a receiving port, a first photodiode, a second photodiode, a first reflector, a wavelength division multiplexer, a second reflector and a lens, wherein the transmitting port, the receiving port, the first photodiode, the second photodiode, the first reflector, the second reflector and the lens are arranged on two opposite sides of the shell respectively, the first reflector, the wavelength division multiplexer, the second reflector and the lens are arranged in the shell respectively, the first reflector and the second reflector are positioned on two ends of the wavelength division multiplexer respectively, the lens is positioned between the wavelength division multiplexer and the receiving port, light with wavelengths of 1342nm,1490nm and 1577nm entering from the transmitting port passes through the wavelength division multiplexer and the lens to be converged and then is emitted from the receiving port, light with wavelengths of 1270nm,1286nm and 1310nm entering from the receiving port passes through the lens to be collimated and then enters the wavelength division multiplexer, light with wavelengths of 1286nm passes through the wavelength division multiplexer to be multiplexed and then is reflected to the first photodiode by the second reflector, and light with wavelengths of 1270nm and 1310nm passes through the wavelength division multiplexer to be multiplexed and then is reflected to the second photodiode by the first reflector.

Further, the lens is a square lens.

Further, the first photodiodes and the second photodiodes are alternately arranged on two sides of the shell.

Further, the first reflector is fixed on the shell, the first reflector is inclined, and the first reflector faces the wavelength division multiplexer and the second photodiode.

Further, the first reflector is adhered to the inside of the shell through ultraviolet glue.

Further, the second reflector is fixed on the shell, the second reflector is inclined, and the second reflector faces the wavelength division multiplexer and the first photodiode.

Further, the second reflector is adhered to the inside of the shell through ultraviolet glue.

Further, the casing is square, the casing includes a tube shell and a tube cover, the transmitting port, the receiving port, the first photodiode, the second photodiode, the first reflector, the wavelength division multiplexer, the second reflector and the lens are mounted on the tube shell, and the tube cover is mounted on the tube shell.

Compared with the prior art, the 50G passive optical network receiving end component adopts the wavelength division multiplexer and the lens, light with the wavelengths of 1342nm,1490nm and 1577nm entering from the transmitting port is converged by the wavelength division multiplexer and the lens and then is emitted from the receiving port, light with the wavelengths of 1270nm,1286nm and 1310nm entering from the receiving port is collimated by the lens and then enters the wavelength division multiplexer, light with the wavelength of 1286nm is multiplexed by the wavelength division multiplexer and then is reflected to the first photodiode by the second reflector, light with the wavelengths of 1270nm and 1310nm is multiplexed by the wavelength division multiplexer and then is reflected to the second photodiode by the first reflector, and through the design, under the condition of not increasing cost, the accuracy of angle offset of receiving and transmitting light paths is improved by coupling of the square lens and the receiving and transmitting ends, and the coupling efficiency and the yield of the client are improved; on the basis of realizing the single-fiber bidirectional function, the requirement of a 50GPON wavelength division multiplexing receiving end is met, and the device has the advantages of small volume, simple structure and high assembly precision.

Drawings

FIG. 1 is a front view of a 50G passive optical network receiver assembly of the present invention;

FIG. 2 is a side view of the 50G passive fiber optic network receiver assembly of FIG. 1;

FIG. 3 is a schematic diagram of the internal structure of the receiving-end assembly of the 50G passive optical network of FIG. 1;

FIG. 4 is a forward optical path diagram of the 50G passive optical network receiver assembly of FIG. 1;

fig. 5 is a reverse optical path diagram of the 50G passive optical network receiver-side assembly of fig. 1.

In the figure: 10. a transmit port; 20. a housing; 21. a tube shell; 22. a tube cover; 30. a receiving port; 40. a first photodiode; 50. a second photodiode; 60. a first mirror; 70. a wavelength division multiplexer; 80. a second mirror; 90. and a lens.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or be present as another intermediate element through which the element is fixed. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1 to 5, the passive optical network receiving end assembly of the present invention 50G includes a transmitting port 10, a housing 20, a receiving port 30, a first photodiode 40, a second photodiode 50, a first mirror 60, a wavelength division multiplexer 70, a second mirror 80, and a lens 90.

The emission port 10 is connected with a laser, and light with wavelengths of 1342nm,1490nm and 1577nm emitted by the laser enters the passive optical network receiving end assembly from the emission port 10.

The housing 20 includes a tube housing 21 and a tube cover 22. The package 21 is a hollow structure for mounting the first photodiode 40, the second photodiode 50, the first mirror 60, the wavelength division multiplexer 70, the second mirror 80, and the lens 90. In this embodiment, the housing 20 is square, and the tube cover 22 is welded to the tube housing 21. In other embodiments, the tube cover 22 and the tube shell 21 may be fixed in a non-sealing manner by using a buckle, or may be sealed by adding a sealing ring.

The receiving port 30 is connected to the optical fiber, and the receiving port 30 is welded and fixed to the housing 20. The receiving port 30 and the transmitting port 10 are located at opposite ends of the housing 20, respectively.

The first photodiode 40 is fixed to a side surface of the housing 20 near the receiving port 30, and the first photodiode 40 is for receiving light having a wavelength of 1286 nm.

The second photodiode 50 is fixed on the side surface of the housing 20 near the emission port 10, and the second photodiode 50 is staggered with the first photodiode 40. The second photodiode 50 is capable of receiving light having wavelengths of 1270nm and 1310nm simultaneously.

The first mirror 60 is mounted in the housing 21 between the wavelength division multiplexer 70 and the transmit port 10. The first mirror 60 is disposed obliquely, and the first mirror 60 is directed toward the wavelength division multiplexer 70 and the second photodiode 50. In this embodiment, the first reflective mirror 60 is directly attached in a passive manner, and is adhered in the tube shell 21 by using ultraviolet glue, so that automatic attachment can be realized, and consistency and stability of products are ensured.

The wavelength division multiplexer 70 is installed in the package 21, and the wavelength division multiplexer 70 is located between the transmitting port 10 and the receiving port 30. In this embodiment, the wavelength division multiplexer 70 is a passive direct mounting, and is adhered in the tube shell 21 by using ultraviolet glue, so that automatic mounting can be realized, and consistency and stability of products are ensured.

A second mirror 80 is mounted within the housing 21 between the wavelength division multiplexer 70 and the receiving port 30. The second mirror 80 is disposed obliquely, and the second mirror 80 faces the wavelength division multiplexer 70 and the first photodiode 40. In this embodiment, the second reflector 80 is directly attached in a passive manner, and is adhered in the tube shell 21 by using ultraviolet glue, so that automatic attachment can be realized, and consistency and stability of products are ensured.

A lens 90 is mounted within the housing 21 between the wavelength division multiplexer 70 and the receiving port 30. The lens 90 is a square lens.

When the 50G passive optical network receiving end component is used, light with three wavelengths of 1342nm,1490nm and 1577nm of the transmitting port 10 is incident into the wavelength division multiplexer 70 from a laser, light with three wavelengths of 1342nm,1490nm and 1577nm after multiplexing by the wavelength division multiplexer 70 is incident into the lens 90 and is converged into an optical fiber of the receiving port 30 through the lens 90, and thus optical signals are transmitted into the optical fiber after being transmitted by wavelength division multiplexing.

Optical signals with wavelengths of 1270nm,1286nm and 1310nm are input into the receiving port 30 from the optical fiber, collimated by the lens 90 and then are incident on the wavelength division multiplexer 70, and the wavelength division multiplexer 70 demultiplexes the optical signals and outputs the optical signals to corresponding reflectors respectively. The 1286nm optical signal is reflected by the second mirror 80 such that the 1286nm optical signal is received by the first photodiode 40; optical signals of 1270nm and 1310nm are reflected by the first mirror 60 and received by the second photodiode 50; thus, the 1270nm,1286nm and 1310nm are respectively received by the corresponding photodiodes, and the single-fiber bidirectional receiving and transmitting integrated function is realized.

According to the method, the collimating lens is changed into the square lens, and under the condition of not increasing the cost, the accuracy of angle offset of a receiving light path and a transmitting light path is improved by coupling the square lens with the receiving port 30 and the transmitting port 10, so that the coupling efficiency and the yield of a client are improved; the receiving port 30 is in the form of a TO package; the requirements of different costs and application scenes of customers are met, and the requirement of 50GPON is met; the laser at customer emission port 10 may be in COB package form, and is smaller and less costly than the overall TO package.

The foregoing examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, it is possible to make several modifications and improvements without departing from the concept of the present invention, which are equivalent to the above embodiments according to the essential technology of the present invention, and these are all included in the protection scope of the present invention.

Claims

1. The utility model provides a 50G passive optical network receiving end subassembly, includes the casing, install in transmitting port and receiving port of casing, its characterized in that: the 50G passive optical network receiving end assembly further comprises a first photodiode, a second photodiode, a first reflecting mirror, a wavelength division multiplexer, a second reflecting mirror and a lens, wherein the first photodiode and the second photodiode are respectively arranged on two opposite sides of the shell, the first reflecting mirror, the wavelength division multiplexer, the second reflecting mirror and the lens are respectively arranged in the shell, the first reflecting mirror and the second reflecting mirror are respectively arranged at two ends of the wavelength division multiplexer, the lens is arranged between the wavelength division multiplexer and the receiving port, light with wavelength of 1342nm,1490nm and 1577nm enters from the receiving port after being converged by the wavelength division multiplexer and the lens, light with wavelength of 1270nm,1286nm and 1310nm enters into the wavelength division multiplexer after being collimated by the lens, and light with wavelength of 6nm enters from the wavelength division multiplexer after being multiplexed by the second reflecting mirror and the lens with wavelength of 1280 nm after being multiplexed by the second reflecting mirror and the second reflecting mirror with wavelength of 1280 nm.

2. The 50G passive optical network receiver assembly of claim 1, wherein: the lens is a square lens.

3. The 50G passive optical network receiver assembly of claim 1, wherein: the first photodiodes are arranged on two sides of the shell in a staggered mode.

4. The 50G passive optical network receiver assembly of claim 1, wherein: the first reflector is fixed to the housing, the first reflector is inclined, and the first reflector faces the wavelength division multiplexer and the second photodiode.

5. The 50G passive optical network receiver assembly of claim 4, wherein: the first reflector is adhered to the inside of the shell through ultraviolet glue.

6. The 50G passive optical network receiver assembly of claim 1, wherein: the second reflector is fixed on the shell, the second reflector is inclined, and the second reflector faces the wavelength division multiplexer and the first photodiode.

7. The 50G passive optical network receiver assembly of claim 6, wherein: the second reflector is adhered to the inside of the shell through ultraviolet glue.

8. The 50G passive optical network receiver assembly of claim 1, wherein: the casing is square, the casing includes tube shell and tube cover, the transmitting port receive port first photodiode, second photodiode first reflector, wavelength division multiplexer second reflector and lens install in the tube shell, the tube cover install in the tube shell.