CN116893485A - External micro single fiber bidirectional multiplexer - Google Patents

Abstract

The invention discloses an external miniature single-fiber bidirectional multiplexer, which includes a casing and an optical multiplexer and demultiplexer installed in the casing. The optical multiplexer and demultiplexer outputs three optical fibers from a single end, one of which is an inner common end optical fiber. , inner transmitting end optical fiber and inner receiving end optical fiber. The three optical fibers are connected out of the shell respectively to form a common end optical fiber, a transmitting end optical fiber and an inner receiving end optical fiber. Advantages of the present invention: due to the simple and convenient fiber winding structure of the external single-fiber bidirectional multiplexer, its volume is very small, even smaller than the volume of a dual LC optical fiber plug. It generally does not affect optical fiber wiring, and users can even use it as an ordinary dual LC optical fiber plug. The same plug-in connection greatly improves the user experience.

Description

External micro single fiber bidirectional multiplexer

Technical field

The invention relates to the technical field of single-fiber bidirectional optical modules, and in particular to an external miniature single-fiber bidirectional multiplexer.

Background technique

With the development of optical communication technology, the requirements for fiber utilization are getting higher and higher. Single-fiber bidirectional optical module is a good solution. However, single-fiber bidirectional optical modules are very different from ordinary dual-fiber optical modules. From the shell to TOSA/ROSA to PCBA they are all very different. Designing, purchasing and maintaining two completely different optical modules greatly increases the user's cost. At the same time, with the development of high-speed optical modules above 100G, it is found that only wavelengths close to 1309 nanometers can meet the needs of long-distance transmission. Traditional BOSA often uses 30 to 45-degree large-angle filters, and the characteristics of the filter at large angles are quite different from those at normal incidence. The actual filter wavelength will shift because the direction of the transmitting and receiving optical signals is 90 degrees different. Therefore, it is difficult for the filter wavelength to meet the transmission and reflection requirements of both at the same time. There are great difficulties encountered in the design, and it is also difficult to meet the requirements of a very small wavelength interval of about 2 nanometers. The transmission of 100G optical signals in the 1310 band over 30 kilometers requires a very small wavelength interval of 2 nanometers to 4.5 nanometers.

Therefore, how to design a single-fiber bidirectional optical module solution to reduce the wavelength interval and use ordinary optical modules has become an urgent problem to be solved.

Contents of the invention

The technical problem to be solved by the present invention is: how to design a single-fiber bidirectional optical module solution to reduce the wavelength interval and be able to be used in ordinary optical modules.

The specific technical solutions adopted are as follows:

An external miniature single-fiber bidirectional multiplexer, including a casing and an optical multiplexer and demultiplexer installed in the casing. The optical multiplexer and demultiplexer have three optical fibers output from a single end, namely an inner common end optical fiber and an inner transmitting end. Optical fiber and inner receiving end optical fiber, three optical fibers are connected out of the shell respectively to form a common end optical fiber, a transmitting end optical fiber and a receiving end optical fiber.

In a further preference of the technical solution of the present invention, the optical multiplexer and demultiplexer are arranged on one side of the housing in order to reduce the external volume of the external single-fiber bidirectional wavelength division multiplexer.

In a further preferred embodiment of the technical solution of the present invention, the inner common end optical fiber is arranged in a cross-circle in the inner cavity of the housing.

In a further preferred embodiment of the technical solution of the present invention, the optical fiber is fixed in the housing through glue.

In a further preferred embodiment of the technical solution of the present invention, the bending radius of the optical fiber winding is greater than 5 mm.

In a further preferred embodiment of the technical solution of the present invention, optical fiber plugs are provided at the ends of both the transmitting end optical fiber and the receiving end optical fiber.

In a further preferred embodiment of the technical solution of the present invention, the transmitting end optical fiber and the receiving end optical fiber are led out from one end of the housing, and the common end optical fiber is led out from the other end.

A further optimization of the technical solution of the present invention is that the two ends of the external micro single-fiber bidirectional multiplexer are connected to optical modules that require communication, and the optical modules at both ends use light emitting subassemblies with different wavelengths.

Compared with the prior art, the present invention has the following beneficial effects:

In this invention, due to the simple and convenient fiber winding structure of the external single-fiber bidirectional multiplexer, its volume is very small, even smaller than the volume of the dual LC optical fiber plug. It generally does not affect the optical fiber wiring, and the user can even treat it as an ordinary dual LC optical fiber plug. Plug-in connection greatly improves the user experience.

Description of the drawings

Figure 1 is a front view of the present invention;

Figure 2 is a cross-sectional view of Figure 1;

Figure 3 is a side view of Figure 2;

Figure 4 is a schematic diagram of a traditional dual-fiber optical module using an external wavelength division multiplexer for single-fiber bidirectional use (using one optical fiber);

Figure 5 is a schematic diagram of the connection of a traditional dual-fiber optical module using two original optical fibers.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings 1 to 5 and examples. It should be understood that the specific embodiments described here are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

As shown in Figures 1 and 2, this embodiment is an external miniature single-fiber bidirectional multiplexer. 1 is an external single-fiber bidirectional wavelength division multiplexer, 11 is a reflective single-ended optical multiplexer, and 12 It is an external single-fiber bidirectional wavelength division multiplexer housing. Three optical fibers of the reflective single-ended optical multiplexer and demultiplexer 11 are led out from one end. They are the common end optical fiber in 13, the inner transmitting end optical fiber in 14, and the inner receiving end optical fiber in 15. 3 is the common end optical fiber, 4 is the transmitting end optical fiber plug, and 5 is the receiving end optical fiber plug.

This embodiment is an external miniature single-fiber two-way multiplexer. The reflective single-ended optical multiplexer 11 is installed in the external single-fiber two-way multiplexer housing 12. The reflective single-ended optical multiplexer 11 There are three optical fibers coming out of the single end, which are the inner common end optical fiber 13, the inner transmitting end optical fiber 14 and the inner receiving end optical fiber 15. The three optical fibers are respectively connected to the external single fiber bidirectional wavelength division multiplexer housing 12 to form the common end optical fiber 3, The transmitting fiber and the receiving fiber. The transmitting end optical fiber and the receiving end optical fiber are located at one end of the external single-fiber bidirectional wavelength division multiplexer housing 1 and are led out, and the common end optical fiber 3 is led out from the other end.

As shown in Figure 2, a transmitting end optical fiber plug 4 and a receiving end optical fiber plug 5 are respectively provided at the ends of the transmitting end optical fiber and the receiving end optical fiber. The transmitting end optical fiber plug 4 and the receiving end optical fiber plug 5 can be directly inserted into the optical module. inside the socket.

As shown in Figure 2, both the transmitting end optical fiber plug 4 and the receiving end optical fiber plug 5 are LC optical fiber plugs.

In order to reduce the external volume of the external single-fiber bidirectional wavelength division multiplexer, the reflective single-ended optical multiplexer 11 is installed in the external single-fiber bidirectional wavelength division multiplexer housing 12, and the reflective single-ended optical multiplexer 11 The wave device 11 is arranged on one side, which can save space.

In order to reduce the size of the external single-fiber bidirectional wavelength division multiplexer, the inner common end optical fiber 13 is wound at 180 degrees and is led out from the other end of the external single-fiber bidirectional wavelength division multiplexer 1 . In order for the optical fiber to be reliably connected and the bending loss to be minimal, the optical fiber bending radius should be greater than 5 mm.

As shown in Figures 1, 2 and 3, due to the simple and convenient fiber winding structure of the external single fiber bidirectional multiplexer, its volume is small. It can be seen from the figure that it is even smaller than the volume of a double LC fiber optic plug. Generally it will not affect fiber optic cabling, and users can even insert and connect it as an ordinary dual LC fiber optic plug. Greatly improves the user experience.

At the same time, due to the use of an external structure, the optical module realizes dual-fiber and single-fiber bidirectional switchable connections. The two ends of the external micro single-fiber bidirectional multiplexer are connected to the optical modules that need communication. The optical modules at both ends use optical modules with different wavelengths. The transmitting subassembly can realize dual-fiber and single-fiber bidirectional connection methods. It is convenient for users to upgrade and use seamlessly, and its spare parts can be interchanged with each other. Greatly reduces the user's use and maintenance costs.

The optical modules at both ends use different emission wavelengths to seamlessly switch from dual-fiber bidirectional to single-fiber bidirectional. If dual-fiber communication is used now, and the amount of data will increase in the future, you can purchase an external single-fiber two-way wavelength division multiplexer and plug it in directly to double the overall fiber transmission rate, achieve seamless upgrades, and greatly reduce user usage. Maintenance costs.

As shown in Figure 4, a schematic diagram of a traditional dual-fiber optical module using an external wavelength division multiplexer to achieve single-fiber bidirectionality. As can be seen from Figure 4, light emitting subassemblies (TOSA) with different wavelengths are used at both ends, while the optical receiving subassembly (ROSA) uses a very wide wavelength, so in fact, the 1304 nm light receiving subassembly and the 1309 nm light receiving subassembly Subcomponents are the same. This further reduces components and improves component reusability.

As shown in Figure 5, the traditional dual-fiber optical module uses the connection diagram of the original two optical fibers. As can be seen from Figure 5, light emitting subassemblies (TOSA) with different wavelengths are used at both ends, while the optical receiving subassembly (ROSA) uses a very wide wavelength, so in fact, the 1304 nm light receiving subassembly and the 1309 nm light receiving subassembly Subcomponents are the same. In this way, both the transmitted signal of 1304 and 1309 can be received by the light receiving subassembly. Dual-fiber communication function is also realized.

The dual-fiber optical modules in Figure 4 and Figure 5 are almost identical. The optical module on one side uses a light emission sub-assembly (TOSA) with an emission wavelength of 1304 nanometers, and the optical module on the other side uses a light emission sub-assembly (TOSA) with an emission wavelength of 1309 nanometers. Other than that, the light receiving subassembly, PCBA, and housing are the same. To switch to single-fiber bidirectional, you only need to connect external single-fiber bidirectional wavelength division multiplexers at both ends. If the fiber usage rate of users is not high at first, there is no need to purchase an external single-fiber bidirectional wavelength division multiplexer. Later, when the amount of data increases, purchasing an external single-fiber two-way wavelength division multiplexer and plugging it in directly can double the overall transmission rate of the optical fiber, achieve seamless switching, and greatly reduce the user's use and maintenance costs.

The external micro single-fiber bidirectional multiplexer in this embodiment is used by requiring that the optical modules at both ends of the communication use optical transmitting sub-assemblies (TOSA) with different wavelengths, and the optical receiving sub-assembly (ROSA) uses a very wide wavelength , so in fact the 1304 nm light receiving subassembly and the 1309 nm light receiving subassembly are the same. In this way, both the transmitted signal of 1304 and 1309 can be received by the light receiving subassembly. Dual-fiber communication function is also realized. This setting enables seamless switching between single-fiber bidirectional and dual-fiber communications. Reduces user maintenance costs.

It is easy for those skilled in the art to understand that the above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements, etc., made within the spirit and principles of the present invention, All should be included in the protection scope of the present invention.

Claims (8)

1. An external miniature single-fiber bidirectional multiplexer, characterized in that it includes a casing and an optical multiplexer and demultiplexer installed in the casing. The optical multiplexer and demultiplexer has three optical fibers output from a single end, which are internal and public. The three optical fibers are respectively connected out of the outer shell to form a common end optical fiber, an inner transmitting end optical fiber and an inner receiving end optical fiber. 2. The external miniature single-fiber bidirectional multiplexer according to claim 1, characterized in that the optical multiplexer and demultiplexer are arranged on one side of the housing. 3. The external micro single-fiber bidirectional multiplexer according to claim 2, characterized in that the inner common end optical fiber is arranged in a cross-circle in the inner cavity of the housing. 4. The external micro single-fiber bidirectional multiplexer according to claim 3, characterized in that the optical fiber is fixed in the casing through glue. 5. The external micro single-fiber bidirectional multiplexer according to claim 3, characterized in that the bending radius of the optical fiber winding is greater than 5 mm. 6. The external micro single-fiber bidirectional multiplexer according to claim 1, characterized in that optical fiber plugs are provided at the ends of the transmitting end optical fiber and the receiving end optical fiber. 7. The external micro single-fiber bidirectional multiplexer according to claim 1, characterized in that the transmitting end optical fiber and the receiving end optical fiber are led out from one end of the housing, and the common end optical fiber is led out from the other end. 8. The external micro single-fiber bidirectional multiplexer according to claim 1, characterized in that the two ends of the external micro single-fiber bidirectional multiplexer are connected to optical modules that require communication, and the optical modules at both ends adopt different wavelengths. light emitting subassembly.