CN113655567B

CN113655567B - Wavelength division multiplexer with multiple channels

Info

Publication number: CN113655567B
Application number: CN202111021897.2A
Authority: CN
Inventors: 袁春英; 高小燕; 孙雪萍; 李涛
Original assignee: Sichuan Tianyi Comheart Telecom Co Ltd
Current assignee: Sichuan Tianyi Comheart Telecom Co Ltd
Priority date: 2021-09-01
Filing date: 2021-09-01
Publication date: 2023-08-01
Anticipated expiration: 2041-09-01
Also published as: CN113655567A

Abstract

The invention discloses a wavelength division multiplexer with multiple channels, which comprises a splitter and 32 groups of wavelength division multiplexers, wherein each group of wavelength division multiplexer comprises 3 coarse wavelength division multiplexers CWDM and 1 filter-sheet type wavelength division multiplexer FWDM, the splitter is respectively connected with each group of wavelength division multiplexer, the 3 coarse wavelength division multiplexers CWDM and the 1 filter-sheet type wavelength division multiplexer FWDM in each group of wavelength division multiplexer are sequentially connected, and the coarse wavelength division multiplexer CWDM comprises 1551CWDM, 1431CWDM and 1451CWDM. The invention injects the signal into the input port of the branching unit, can divide the signal with the wavelength of 1551nm into 32 paths for transmission, and the other signals are isolated; the invention integrates the transmission of the 32-group wavelength division multiplexer, has small size and is convenient for installation.

Description

Wavelength division multiplexer with multiple channels

Technical Field

The present invention relates to the technical field of communication devices, and in particular, to a wavelength division multiplexer with multiple channels.

Background

Wavelength division multiplexing WDM (Wavelength Division Multiplexing) is a technology of combining two or more optical carrier signals with different wavelengths (carrying various information) at a transmitting end via a Multiplexer (also called a Multiplexer) and coupling the signals to the same optical fiber of an optical line for transmission; at the receiving end, the optical carriers of various wavelengths are separated by a Demultiplexer (also known as a Demultiplexer) and then further processed by an optical receiver to recover the original signal. This technique of transmitting two or more different wavelength optical signals simultaneously in the same optical fiber is known as wavelength division multiplexing.

CWDM (Coarse Wavelength Division Multiplexer) is a sparse wavelength division multiplexer, also known as a coarse wavelength division multiplexer. CWDM has 18 different wavelength channels, each separated by 20nm, using wavelengths 1270 nm to 1610 nm. CWDM supports fewer channels than DWDM because it is compact and cost effective, thus making it an ideal solution for short-range communications. The biggest advantage of the CWDM system is low cost, and the device cost is mainly represented by the filter and the laser. The wide wavelength spacing of 20nm also brings advantages to CWDM such as low technical index requirements for the laser and simplified structure of the optical multiplexer/demultiplexer. The structure is simplified, the yield is improved, and the cost is reduced.

DWDM (Dense Wavelength Division Multiplexer) is a dense wavelength division multiplexer. The channel spacing of DWDM is 1.6/0.8/0.4 nm (200 GHz/100 GHz/50 GHz), much smaller than CWDM. DWDM with a tighter wavelength spacing can carry 8 to 160 wavelengths on one fiber than CWDM, and is more suitable for long distance transmission. With the help of EDFAs, DWDM systems can operate over thousands of kilometers.

FWDM (Filter Wavelength Division Multiplexing) filter-chip wavelength division multiplexers are based on the mature thin-film filter technology. The filter type wavelength division multiplexer can mix or separate light with different wavelengths in a wider wavelength range, and is widely applied to erbium-doped optical amplifiers, raman amplifiers and WDM optical fiber networks.

The MWDM is to reuse the first 6 waves of the CWDM, compress the wavelength interval of 20nm of the CWDM into 7nm, and realize the expansion of 1 wave into 2 waves by adopting the TEC (Thermal Electronic Cooler, semiconductor refrigerator) temperature control technology. This allows for further savings in optical fiber while achieving capacity improvement.

LWDM is a wavelength division multiplexing Lan-WDM technology based on ethernet channels, also known as fine wavelength division multiplexing. The channel spacing is 200-800 GHz, which ranges between DWDM (100 GHz, 50 GHz) and CWDM (about 3 THz).

At present, the conventional wavelength division multiplexer is usually configured to connect different center wavelength multiplexers in series, so as to filter the required wavelength, the final wavelength reflecting end is used as an upgrading end, the maximum channel supported by the CWDM is generally 1 x 18 channels, the COM end, the transmitting end and the reflecting end are connected with the rest of devices in a conventional SC/FC/LC connector mode, and the packaging mode is generally a box type and an inserting sheet mode. The traditional wavelength division multiplexer has the problems that the insertion loss of an output port is higher, the uniformity of the insertion loss is poor, and signals in a wider wavelength range cannot be isolated and transmitted.

Disclosure of Invention

In order to solve the above problems, the present invention provides a wavelength division multiplexer with multiple channels, including a splitter and 32 groups of wavelength division multiplexers, where each group of wavelength division multiplexer includes 3 coarse wavelength division multiplexers CWDM and 1 filter-chip wavelength division multiplexer FWDM, the splitter is connected to each group of wavelength division multiplexers, and 3 coarse wavelength division multiplexers CWDM and 1 filter-chip wavelength division multiplexer FWDM in each group of wavelength division multiplexers are sequentially connected.

Specifically, the coarse wavelength division multiplexer CWDM includes 1551CWDM, 1431CWDM and 1451CWDM, the splitter is connected to a transmitting end of the 1551CWDM, a reflecting end of the 1551CWDM is connected to a COM end of the 1431CWDM, a reflecting end of the 1431CWDM is connected to a COM end of the 1451CWDM, and a reflecting end of the 1451CWDM is connected to a COM end of the FWDM.

Specifically, the COM end of the 1551CWDM is welded with the 0.9SC/APC pigtail.

Specifically, the transmission end of 1431CWDM is provided with a 24-core MPO connector.

Specifically, the transmission end of 1451CWDM is provided with a 24-core MPO connector.

Specifically, the transmission end of the FWDM is provided with a 12-core MPO linker.

Specifically, the reflecting end of the FWDM is welded with the 0.9LC/APC pigtail.

Specifically, the connection mode of the splitter and each group of wavelength division multiplexer is fusion.

Specifically, the connection modes of 3 coarse wavelength division multiplexers CWDM and 1 filter-sheet type wavelength division multiplexer FWDM in each group of wavelength division multiplexers are welding.

The invention has the beneficial effects that: the signals are injected into the input port of the splitter, the signals with the wavelength of 1551nm can be divided into 32 paths for transmission, and other signals are isolated; the COM end of the 1551CWDM carries various signals, and signals with wavelength ranges of 1431nm, 1451nm, 1260-1420nm, 1460-1500nm, 1510-1540nm and 1560-1620nm can be isolated and transmitted; the invention integrates the transmission of 32 groups of wavelength division multiplexers, has small size and is convenient for installation; the output port 1431CWDM transmission end, 1451CWDM transmission end, FWDM transmission end and FDWM reflection end have the characteristics of low insertion loss and small insertion loss uniformity.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a set of WDM structures;

FIG. 2 is a schematic diagram of a set of WDM structures;

FIG. 3 is a schematic diagram of the structure of the present invention.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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 should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present invention, it should be noted that, the azimuth or positional relationship indicated by the term "intermediate" is based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship in which the inventive product is conventionally put in use, only for convenience of description and simplification of description, and is not to indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present invention.

In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the term "connected" should be construed broadly, and may be a fixed connection, a removable connection, or an integral connection, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Some embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.

Example 1:

referring to fig. 1-3, a wavelength division multiplexer with multiple channels includes a splitter and 32 groups of wavelength division multiplexers, each group of wavelength division multiplexer includes 3 coarse wavelength division multiplexers CWDM and 1 filter-chip wavelength division multiplexer FWDM, the splitter is connected with each group of wavelength division multiplexer respectively, and 3 coarse wavelength division multiplexers CWDM and 1 filter-chip wavelength division multiplexer FWDM in each group of wavelength division multiplexer are connected in turn.

Further, in this embodiment, the coarse wavelength division multiplexer CWDM includes 1551CWDM, 1431CWDM and 1451CWDM, the splitter is connected to the transmitting end of the 1551CWDM, the reflecting end of the 1551CWDM is connected to the COM end of the 1431CWDM, the reflecting end of the 1431CWDM is connected to the COM end of the 1451CWDM, and the reflecting end of the 1451CWDM is connected to the COM end of the FWDM.

Further, in this embodiment, the COM end of the 1551CWDM (L1, L1 in fig. 1 represents the COM end of the first set of wdm 1551CWDM, and so on) is welded to the 0.9SC/APC pigtails, and the SC/APC pigtails are in a clamped square shape (large square opening). The SC type tail fiber connector is fastened by adopting a plug pin latch type, and the plug pin latch type is free from rotation, convenient in plug operation, low in price, small in insertion loss fluctuation and higher in compressive strength.

Further, in this embodiment, the transmission end of the 1431CWDM (R1, R1 in fig. 1 represent the transmission end of the first set of wavelength division multiplexers 1431CWDM, and so On) is provided with a 24-core MPO connector (Multi-fiber Push On, which is one of the types of optical fiber connectors), and the middle 16 cores are reserved. MPO splice (connector) is a multi-core connector standard, typically comprising 12-core optical fibers arranged in a row, and can support one or more rows of optical fibers in the same MPO connector, the standard being specified by IEC 61754-7, and being divided into one row (12 cores) and multiple rows (24 cores or more) according to the number of cores arranged in the connector.

Further, in this embodiment, the transmission end of the 1451CWDM (T1, T1 in fig. 1 represents the transmission end of the first set of wavelength division multiplexers 1451CWDM, and so on) is provided with a 24-core MPO connector, leaving a middle 16-core.

Further, in this embodiment, the transmission end of the FWDM (E1, E1 in fig. 1 are transmission ends of the first group of wavelength division multiplexers FWDM, and so on) is provided with a 12-core MPO connector, leaving an intermediate 8-core.

Further, in this embodiment, the reflective end of the FWDM (D1, D1 in fig. 1 are reflective ends of the first group of wavelength division multiplexers FWDM, and the like) is welded to the 0.9LC/APC pigtail, the LC/APC pigtail connector is a clamping square (small square opening), the LC-type pigtail connector is made by using a modular jack (RJ) latch mechanism with convenient operation, and the sizes of the pins and the sleeves used are half of those of the common SC, FC, and the like, so as to improve the density of the optical fiber connectors in the optical fiber distribution frame. Currently, LC-type connectors have been dominant in single-mode SFF, and applications in multimode have also grown rapidly.

Furthermore, in this embodiment, the splitter is connected to each set of wavelength division multiplexers in a fusion manner.

Further, in this embodiment, the connection modes of the 3 coarse wavelength division multiplexers CWDM and the 1 filter-type wavelength division multiplexer FWDM in each set of wavelength division multiplexers are fusion.

Further, in this embodiment, the splitter is a PLC controller.

The invention combines the coarse wavelength division multiplexer CWDM, the filter wave sheet type wavelength division multiplexer FWDM and the PLC controller to realize the combination of 32 groups of wavelength division multiplexers, and adds MPO, SC/APC and LC/APC connectors to integrate the 128 channels of wavelength division multiplexer into a case.

In the embodiment, the signals are injected into an input port of a splitter (PLC controller), the signals with the wavelength of 1551nm can be divided into 32 paths for transmission, and other signals are isolated; the COM end of the 1551CWDM carries various signals, and signals with wavelength ranges of 1431nm, 1451nm, 1260-1420nm, 1460-1500nm, 1510-1540nm and 1560-1620nm can be isolated and transmitted; the invention integrates the transmission of 32 groups of wavelength division multiplexers, has small size and is convenient for installation; the output port 1431CWDM transmission end, 1451CWDM transmission end, FWDM transmission end and FDWM reflection end have the characteristics of low insertion loss and small insertion loss uniformity.

Further, in order to increase the mounting density of the wavelength division multiplexer, another embodiment of the present invention is proposed.

Example 2:

Further, in this embodiment, the COM end of the 1551CWDM (L1 in fig. 1, L1 represents the COM end of the first group of wdm 1551CWDM and so on) is welded with the 0.9LC/APC pigtail, and the LC/APC pigtail connector is a clamping square (small square opening), so that the size of the 0.9LC/APC pigtail connector is smaller than that of the SC/APC pigtail connector in embodiment 1, thereby further improving the installation density of the wdm.

Further, in this embodiment, the transmission end of the 1431CWDM (R1, R1 in fig. 1 represent the transmission end of the first set of wavelength division multiplexers 1431CWDM, and so On) is provided with a 24-core MPO (Multi-fiber Push On, the fiber jumper connector is one of MT series connectors), and the middle 16 cores are reserved.

Further, in this embodiment, the reflective end of the FWDM (D1, D1 in fig. 1 are reflective ends of the first set of wavelength division multiplexers FWDM, and so on) is welded to the 0.9LC/APC pigtails, and the LC/APC pigtail connectors are in a clamped square shape (small square opening).

Further, in this embodiment, the splitter is a PLC controller.

It should be noted that, for simplicity of description, the foregoing embodiments are all described as a series of combinations of actions, but it should be understood by those skilled in the art that the present application is not limited by the order of actions described, as some steps may be performed in other order or simultaneously according to the present application. Further, those skilled in the art will appreciate that the embodiments described in the specification are all preferred embodiments and that the acts referred to are not necessarily required in the present application.

In the above embodiments, the basic principle and main features of the present invention and advantages of the present invention are described. It will be appreciated by persons skilled in the art that the present invention is not limited by the foregoing embodiments, but rather is shown and described in what is considered to be illustrative of the principles of the invention, and that modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the invention, and therefore, is within the scope of the appended claims.

Claims

1. The wavelength division multiplexer with multiple channels is characterized by comprising 32 channel splitters and 32 groups of wavelength division multiplexers, wherein each group of wavelength division multiplexer comprises 3 coarse wavelength division multiplexers CWDM and 1 filter-chip wavelength division multiplexer FWDM, the output ports of the 32 channel splitters are respectively connected with each group of wavelength division multiplexer, and the 3 coarse wavelength division multiplexers CWDM and the 1 filter-chip wavelength division multiplexer FWDM in each group of wavelength division multiplexer are sequentially connected; the coarse wavelength division multiplexer CWDM comprises 1551CWDM, 1431CWDM and 1451CWDM, the branching device is connected with a transmission end of the 1551CWDM, a reflection end of the 1551CWDM is connected with a COM end of the 1431CWDM, the reflection end of the 1431CWDM is connected with a COM end of the 1451CWDM, and the reflection end of the 1451CWDM is connected with a COM end of the FWDM; the transmission end of the 1431CWDM is provided with a 24-core MPO connector; the transmission end of the 1451CWDM is provided with a 24-core MPO connector; the transmissive end of the FWDM is provided with a 12-core MPO connector.

2. A wavelength division multiplexer having multiple channels as recited in claim 1, wherein the COM terminal of 1551CWDM is fused with the 0.9SC/APC pigtail.

3. A wavelength division multiplexer having multiple channels as recited in claim 1, wherein the reflective end of the FWDM is fused with the 0.9LC/APC pigtail.

4. A wavelength division multiplexer having multiple channels as recited in claim 1, wherein the splitter is connected to each set of wavelength division multiplexers by fusion.

5. A wavelength division multiplexer with multiple channels as claimed in claim 1, wherein the connection mode of 3 coarse wavelength division multiplexers CWDM and 1 filter-chip wavelength division multiplexer FWDM in each group of wavelength division multiplexers is fusion.