CN214474082U - Wavelength division multiplexing device - Google Patents

Abstract

The application discloses a wavelength division multiplexing device, and relates to the field of optical communication. The wavelength division multiplexing device comprises a first self-focusing lens, a second self-focusing lens and a filter plate, wherein the pitch of the first self-focusing lens is one fourth or odd times of one fourth; the pitch of the second self-focusing lens is one quarter or an odd multiple of one quarter; the filter is arranged between the first self-focusing lens and the second self-focusing lens and is respectively bonded with the first self-focusing lens and the second self-focusing lens through optical path glue; wherein, the refractive index of the light path glue is larger than that of air. This application uses the light path glue of high refractive index to bond WDM filter, self-focusing lens, optic fibre tail fiber, compares in the air, and the light path glue that this application used is closer to the refracting index of each part, has consequently reduced the relative refractive index of each part interface to reduced the reflection of light at interface, made the required precision lower, and the light path glue occupation space is little, can reduce the overall size of wavelength division multiplexing device.

Description

Wavelength division multiplexing device

Technical Field

The present invention relates to the field of optical communications, and in particular, to a wavelength division multiplexing device.

Background

Wavelength division multiplexing refers to a technology of coupling two or more optical signals with different wavelengths to the same optical fiber for transmission at a transmitting end through a multiplexer, and separating the optical signals with different wavelengths at a receiving end through a demultiplexer. The multiplexer and demultiplexer may be collectively referred to as a wavelength division multiplexing device.

There are gaps between the various components of the prior art wavelength division multiplexing devices. While light passing through media of different refractive indices will be reflected at the interface, reducing the intensity of the incident light, the lower the relative refractive index of the two media, the lower the reflectivity at the interface. In order to reduce the reflection phenomenon of the existing wavelength division multiplexing device, an antireflection film is plated on the end face of each fitting of the device. If a better low-reflectivity effect is to be achieved, the requirement on the precision of the antireflection film is higher. In addition, since there is a gap between the components of the conventional wavelength division multiplexing device, the size of the entire device is also large.

SUMMERY OF THE UTILITY MODEL

The application aims to provide a wavelength division multiplexing device to solve the technical problems that the wavelength division multiplexing device in the prior art is large in size and high in precision requirement.

In a first aspect, the present application provides a wavelength division multiplexing device, including a first self-focusing lens, a second self-focusing lens, and a filter. The pitch of the first self-focusing lens is one quarter or an odd multiple of one quarter; the pitch of the second self-focusing lens is one quarter or an odd multiple of one quarter; the filter is arranged between the first self-focusing lens and the second self-focusing lens and is respectively bonded with the first self-focusing lens and the second self-focusing lens through optical path glue; wherein the refractive index of the optical path glue is greater than that of air.

In the application, the refractive index of the optical path glue is greater than that of air, so that the relative refractive index of the optical path glue and the filter is smaller than that of air and the filter, thereby reducing the refractive index of light at the interface of the optical path glue and the filter; similarly, the relative refractive index of the optical path glue and the first self-focusing lens is smaller than that of air and the first self-focusing lens, so that the refractive index of light at the interface of the optical path glue and the first self-focusing lens is reduced; the relative refractive index of the optical path glue and the second self-focusing lens is smaller than that of air and the second self-focusing lens, so that the refractive index of light at the interface of the optical path glue and the second self-focusing lens is reduced. In other words, the wavelength division multiplexing device in the embodiment of the application does not need to additionally plate antireflection films on all the accessories, the cost can be reduced, the precision requirement on the optical path glue is almost eliminated, the cost can be further reduced, in addition, all the accessories are bonded together through the optical path glue, the occupied space of the optical path glue is small, and the size of the whole wavelength division multiplexing device is reduced.

With reference to the technical solution provided by the first aspect, in some possible implementations, the filter includes a substrate and a WDM film, and a relative refractive index between the substrate and the optical path glue is smaller than a relative refractive index between the substrate and the air; the WDM film is plated on the surface of the substrate.

In this application, the WDM membrane is used for reflecting the optical signal of specific wavelength, makes the optical signal that needs the reflection go back unable pass through the filter, the substrate with the relative refractive index that the light path glued is less than the substrate with the relative refractive index of air, therefore, the optical signal is passing through the substrate with the interface surface is glued to the light path, and the reflection of optical signal can reduce.

In some possible implementations, the WDM film is plated on one end surface of the substrate, or the WDM film is plated on both end surfaces of the substrate.

In this application, when the WDM film is plated on one end surface of the substrate, the end of the substrate plated with the WDM film is close to the first self-focusing lens, or the end of the substrate plated with the WDM film is close to the second self-focusing lens; when the WDM film is close to the first self-focusing lens and an optical signal is incident from the first self-focusing lens, the WDM film reflects the optical signal with a specific wavelength back, and the optical signals with the rest wavelengths enter the substrate through the WDM film; when the WDM film is plated on the surfaces of two opposite ends of the substrate, the two opposite ends of the substrate plated with the WDM film are respectively close to the first self-focusing lens and the second self-focusing lens, and when an optical signal is incident from the first self-focusing lens or when the optical signal is incident from the second self-focusing lens, the optical signal with a specific wavelength is directly reflected back by the WDM film without passing through the substrate.

In combination with the technical solution provided by the first aspect, in some possible implementation manners, the wavelength division multiplexing device further includes a first sealing fixing tube, a bonding position between the first self-focusing lens and the filter, and a bonding position between the second self-focusing lens and the filter are located in the first sealing fixing tube, and the filter, the first self-focusing lens, the second self-focusing lens and the first sealing fixing tube are fixed by an optical path adhesive.

In this application, first sealed fixed pipe is used for the protection the filter the first self-focusing lens the second self-focusing lens the first self-focusing lens with the junction of filter the second self-focusing lens with the junction of filter, simultaneously, glue through the light path and make the filter first self-focusing lens the second self-focusing lens with the relative position of first sealed fixed pipe is fixed. In addition, the arrangement mode of the first sealing fixing tube in the application can reduce the size of the whole wavelength division multiplexing device compared with the mode in the prior art.

With reference to the technical solution provided by the first aspect, in some possible implementations, the first sealing and fixing tube is a glass tube, and an outer diameter of the glass tube is 2.4 mm.

In this application, the first sealing and fixing tube can enlarge the selection range of the optical path glue by using a glass tube, namely the optical path glue can use light curing glue. In addition, selecting a glass tube having an outer diameter of 2.4 mm as the first seal fixing tube can further reduce the size of the wavelength division multiplexing device while securing the fixing effect.

With reference to the technical solution provided by the first aspect, in some possible implementation manners, the wavelength division multiplexing device further includes a first fiber pigtail and a second fiber pigtail, a connector of the first fiber pigtail is bonded to the first self-focusing lens through an optical path glue, and a relative refractive index between the connector of the first fiber pigtail and the optical path glue is smaller than a relative refractive index between the connector of the first fiber pigtail and the air; the connector of second optic fibre tail optical fiber with the second is glued through the light path and is glued the bonding by the self-focusing lens, the connector of second optic fibre tail optical fiber with the relative refractive index that the light path glued is less than the connector of second optic fibre tail optical fiber with the relative refractive index of air.

In the application, the relative refractive index between the connector of the first optical fiber pigtail and the optical path glue is smaller than the relative refractive index between the connector of the first optical fiber pigtail and the air, so that the reflection of an optical signal when passing through the interface between the connector of the first optical fiber pigtail and the optical path glue can be reduced; the connector of second optic fibre tail optical fiber with the relative refractive index that the light path glued is less than the connector of second optic fibre tail optical fiber with the relative refractive index of air consequently can reduce the light signal and pass through the connector of second optic fibre tail optical fiber with the reflection of the interfacial surface that the light path glued.

In combination with the technical solution provided by the first aspect, in some possible implementation manners, the wavelength division multiplexing device further includes a second sealing fixing tube, and the first fiber pigtail connector, the second fiber pigtail connector, and the first sealing fixing tube are disposed in the second sealing fixing tube.

In this application, the sealed fixed pipe of second is used for the protection the sealed fixed pipe of first self-focusing lens the second self-focusing lens first optic fibre tail optical fiber second optic fibre tail optical fiber, simultaneously, the relative position of fixed each part prevents that the light path from gluing because of external factors denaturalizing.

In combination with the technical solution provided by the first aspect, in some possible implementation manners, the two ends of the second sealing fixing tube are sealed by using a sealant, the sealant is used for preventing external factors from affecting the optical path glue, and the sealant is further used for fixing the first optical fiber pigtail and the second optical fiber pigtail.

In the application, the sealant is used for sealing the second sealing fixing tube, so that the property of the optical path adhesive is prevented from being changed under the influence of external factors, the performance of the wavelength division multiplexing device is prevented from being influenced, other substances which can influence the wavelength division multiplexing device are prevented from entering the wavelength division multiplexing device, and the reliability of a product is ensured; and simultaneously fixing the first optical fiber pigtail and the second optical fiber pigtail to ensure that the positions of all the parts in the second sealing and fixing pipe are relatively fixed, and ensuring that the function of the product can be realized. In addition, the second sealing and fixing tube in the present application is arranged in a manner that the size of the whole wavelength division multiplexing device can be reduced compared with the prior art.

With reference to the technical solution provided by the first aspect, in some possible implementations, the second sealing and fixing tube is a glass tube, and an outer diameter of the glass tube is 3.2 mm.

In this application, the second sealed fixed tube uses the glass tube to increase the selection range of the optical path glue, i.e. the optical path glue can use the light-cured glue. In addition, selecting a glass tube having an outer diameter of 3.2 mm as the second seal fixing tube can further reduce the size of the wavelength division multiplexing device while securing the fixing effect.

With reference to the technical solution provided by the first aspect, in some possible implementation manners, the thickness of the filter is 0.8 mm, and the size of the wavelength division multiplexing device can be reduced by using the filter of 0.8 mm.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

Fig. 1 is a schematic structural diagram of a wavelength division multiplexing device according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a filter according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of another filter segment according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of another wavelength division multiplexing device provided in an embodiment of the present application;

fig. 5 is a schematic diagram of a propagation path of an optical signal in a partial structure of a wavelength division multiplexing device according to an embodiment of the present application;

fig. 6 is a schematic diagram of a propagation path of an optical signal in a partial structure of a wavelength division multiplexing device according to an embodiment of the present application;

fig. 7 is a schematic diagram of a propagation path of an optical signal in a partial structure of a wavelength division multiplexing device according to an embodiment of the present application.

Icon: 1-a wavelength division multiplexing device; 10-a filter; 11-a first self-focusing lens; 12-a second self-focusing lens; 13-a first fiber pigtail; 14-a second fiber pigtail; 15-a first seal fixing tube; 16-a second seal retaining tube; 17-optical path glue; 171-optical path glue; 172-optical path glue; and (18) sealing glue.

Detailed Description

The terms "first," "second," "third," and the like are used for descriptive purposes only and not for purposes of indicating or implying relative importance, and do not denote any order or order.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it should be noted that the terms "inside", "outside", "left", "right", "upper", "lower", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally arranged when products of the application are used, and are used only for convenience in describing the application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the application.

In the description of the present application, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements.

The technical solution of the present application will be clearly and completely described below with reference to the accompanying drawings.

Referring to fig. 1, a wavelength division multiplexing device is provided according to an embodiment of the present application. The wavelength division multiplexing device 1 includes a filter 10, a first self-focusing lens 11, and a second self-focusing lens 12, wherein the pitch of the first self-focusing lens 11 is one-fourth or an odd multiple of one-fourth, the pitch of the second self-focusing lens 12 is one-fourth or an odd multiple of one-fourth, the filter 10 is disposed between the first self-focusing lens 11 and the second self-focusing lens 12, and is respectively bonded to the first self-focusing lens 11 and the second self-focusing lens 12 through an optical path adhesive 17.

With reference to fig. 1, in order to focus the incident light beam with a very small incident angle into a parallel light output or focus the incident parallel light beam into a light output, one embodiment of the first self-focusing lens 11 is that the pitch of the first self-focusing lens 11 is one fourth.

Alternatively, the first self-focusing lens 11 has a three-quarter pitch, and the self-focusing lens with the three-quarter pitch can also focus the light beam incident at a very small incident angle into a parallel light output, or focus the incident parallel light into a light output.

With reference to fig. 1, in order to focus the light beam incident at a very small incident angle into a parallel light output or to focus the incident parallel light into a light output, one embodiment of the second self-focusing lens 12 is that the pitch of the second self-focusing lens 12 is a quarter, and the end surface of the second self-focusing lens 12 far from the filter 10 has an inclination angle of 8 ° with the vertical surface.

Referring to fig. 1 and 2, one embodiment of the filter 10 is that the filter 10 includes a substrate 101 and a WDM film 102, a relative refractive index between the substrate 101 and the optical path adhesive 17 is much smaller than a relative refractive index between the substrate 101 and air, and the WDM film 102 is plated on a surface of the substrate 10.

Alternatively, in order to reduce the size of the wavelength division multiplexing device 1, it is necessary to reduce the thickness of the filter as much as possible, so the filter 10 may be set to be the thinnest filter, i.e., a filter having a thickness of 0.8 mm. In practice, the filter segment 10 may also be provided as a thinner filter segment, if such a thinner filter segment is present.

With continued reference to fig. 1 and 2, one embodiment of the filter 10 is that the WDM film 102 is plated on the end surface of the substrate 101 near the first self-focusing lens 11, or the WDM film 102 is plated on the end surface of the substrate 101 near the second self-focusing lens 12.

In this embodiment, when the WDM film 102 is close to the first self-focusing lens 11 and the optical signal enters from the first self-focusing lens 11, the WDM film 102 reflects the optical signal with the specific wavelength back, and the optical signals with the other wavelengths enter the substrate 101 through the WDM film 102, and if the WDM film 102 is close to the second self-focusing lens 12 and the optical signal enters from the first self-focusing lens 11, the reflected optical signal needs to enter the substrate 101 and then be reflected back by the WDM film 102, so that the intensity of the reflected optical signal is reduced.

Optionally, in order to reduce the refraction of the optical signal at the interface between the substrate 101 and the optical path paste 17, an embodiment of the substrate 101 is that the substrate 101 is a sapphire substrate with a high refractive index. The embodiment of the application adopts the light path glue 17 with high refractive index to bond the filter 10 with the first self-focusing lens 11 and the second self-focusing lens 12, and the refractive index of the sapphire substrate with high refractive index is close to that of the light path glue 17, so the relative refractive index of the substrate 101 and the light path glue 17 is very small, and the refraction of the optical signal at the interface of the light path glue 17 and the filter 10 is reduced.

Optionally, the refractive index of substrate 101 of filter 10 is 1.5.

Referring to fig. 1 and 3, an embodiment of the filter 10 is that the filter 10 includes a substrate 103, a WDM film 104, and a WDM film 105, and the WDM film 104 and the WDM film 105 are respectively plated on two end surfaces of the substrate 103 near the first self-focusing lens 11 and the second self-focusing lens 12.

In this embodiment, the substrate 103 is plated with the WDM film 104 and the WDM film 105, and both ends of the WDM film 105 are respectively close to the first self-focusing lens 11 and the second self-focusing lens 12, so that when an optical signal is incident from the first self-focusing lens 11 or when an optical signal is incident from the second self-focusing lens 12, the optical signal with a specific wavelength is directly reflected back by the WDM film 104 or the WDM film 105 without passing through the substrate 103.

Optionally, in order to reduce the refraction of the optical signal at the interface between the substrate 103 and the optical path paste 17, an embodiment of the substrate 103 is that the substrate 103 is a sapphire substrate with a high refractive index. In the embodiment of the present application, the optical path glue 17 with a high refractive index is used to bond the filter 10 with the first self-focusing lens 11 and the second self-focusing lens 12, and the refractive index of the sapphire substrate with a high refractive index is close to the refractive index of the optical path glue 17, so the relative refractive index of the substrate 103 and the optical path glue 17 is very small, and the refraction of the optical signal at the interface of the optical path glue 17 and the filter 10 is reduced.

Optionally, the refractive index of the substrate 103 of the filter 10 is 1.5.

Referring to fig. 1, in order to reduce the relative refractive index between the optical path glue 17 and the filter 10, one embodiment of the optical path glue 17 is that the refractive index of the optical path glue 17 is 1.507, and the refractive index of the optical path glue 17 is 1.507 close to the refractive index of the filter 10, which is 1.5.

Two implementation manners of the filter are described above, in practical applications, the filter 10 may have other structures as long as it can reflect the optical signal with the specific wavelength back into the fiber pigtail of the optical signal, and enable the optical signal with other wavelengths to normally pass through the filter.

Optionally, the optical path glue 17 may be a glue with high refractive index and good light transmittance, such as UV glue and FA tail glue.

Referring to fig. 1 and 4, the wavelength division multiplexing device 1 further includes a first sealing fixing tube 15, in order to prevent the optical path adhesive 17 from being denatured by external factors, and to fix the positions of the filter 10, the first self-focusing lens 11, and the second self-focusing lens 12, an embodiment of the first sealing fixing tube 15 is that the bonding position of the first self-focusing lens 11 and the filter 10, and the bonding position of the second sealing fixing tube 12 and the filter are disposed in the first sealing fixing tube 15, and the optical path adhesive 17 is used to fix the first self-focusing lens 11, the filter 10, and the second self-focusing lens 12 in the first sealing fixing tube 15.

Optionally, the filter 10, the first self-focusing lens 11, and the second self-focusing lens 12 are completely accommodated in the first sealing fixing tube 15.

Alternatively, the first seal fixing tube 15 is a glass tube having an outer diameter of 2.4 mm.

Alternatively, the first seal holding tube 15 may have a length of 6 mm.

Alternatively, the first sealing and fixing tube 15 may also be a thin tube made of other materials, such as a metal tube, a plastic tube, etc., and the specific parameters of the first sealing and fixing tube 15, such as the length and the outer diameter, are not limited to specific values.

In this embodiment, the first sealing fixing tube 15 is used to protect the filter 10, the first self-focusing lens 11, the second self-focusing lens 12, the bonding position between the first self-focusing lens 11 and the filter 10, and the bonding position between the second self-focusing lens 12 and the filter 10, and meanwhile, the relative positions of the filter 10, the first self-focusing lens 11, the second self-focusing lens 12 and the first sealing fixing tube 15 are fixed by the optical path adhesive 17. In addition, the first sealing fixing tube 15 in the present application is arranged in a manner that the size of the entire wavelength division multiplexing device can be reduced compared with the prior art.

Referring to fig. 1, the wavelength division multiplexing device 1 further includes a first fiber pigtail 13, in an embodiment of the first fiber pigtail 13, the first fiber pigtail 13 is a single fiber pigtail, the first fiber pigtail 13 is bonded to the first self-focusing lens 11 by an optical adhesive 171, and a refractive index of the optical adhesive 171 is close to a refractive index of the connector of the first fiber pigtail 13.

Alternatively, the first fiber pigtail 13 may be another type of fiber pigtail, such as a dual fiber pigtail, a triple fiber pigtail, or the like.

Optionally, in order to prevent the light reflected at the bonding position of the first self-focusing lens 11 and the first fiber pigtail 13 from affecting the optical signal transmitted in the first fiber pigtail, an embodiment of the first self-focusing lens 11 and the first fiber pigtail 13 is that the interface between the first self-focusing lens 11 and the first fiber pigtail 13 is an inclined plane having an inclination angle of 8 ° with respect to the vertical plane, and because the inclination angle of 8 ° exists, the light reflected at the inclined plane is not reflected back along the incident optical path, that is, the reflected light does not enter the fiber of the first fiber pigtail 13.

Referring to fig. 1, the wavelength division multiplexing device 1 further includes a second fiber pigtail 14, in an embodiment of the second fiber pigtail 14, the second fiber pigtail 14 is a dual-fiber pigtail, the second fiber pigtail 14 is bonded to the second self-focusing lens 12 by a light path glue 172, and a refractive index of the light path glue 172 is close to a refractive index of the connector of the second fiber pigtail 14.

Alternatively, the second fiber pigtail 14 may be other types of fiber pigtails, such as a dual fiber pigtail, a triple fiber pigtail, or the like.

Optionally, in order to prevent the light reflected at the bonding position of the second self-focusing lens 12 and the second fiber pigtail 14 from affecting the optical signal transmitted in the second fiber pigtail 14, an embodiment of the second self-focusing lens 12 and the second fiber pigtail 14 is that the interface between the second self-focusing lens 12 and the second fiber pigtail 14 is an inclined plane having an inclination angle of 8 ° with the vertical plane, and because the inclination angle of 8 ° exists, the light reflected at the inclined plane is not reflected back along the incident optical path, that is, the reflected light does not enter the fiber of the second fiber pigtail 14.

Referring to fig. 1, the wavelength division multiplexing device 1 further includes a second sealing fixing tube 16, and in order to prevent the optical path adhesive 171, the optical path adhesive 172, and the optical path adhesive 17 from being modified by external factors, the positions of the first sealing fixing tube 15, the connector of the first optical fiber pigtail 13, and the connector of the second optical fiber pigtail 14 are fixed, and one embodiment of the second sealing fixing tube 16 is that the connector of the first optical fiber pigtail 13, the connector of the second optical fiber pigtail 14, and the first sealing fixing tube 15 are disposed in the second sealing fixing tube 16.

Referring still to fig. 1, in the alternative, one embodiment of the second seal retaining tube 16 is such that the second seal retaining tube 16 has an outer diameter of 3.2 mm.

Optionally, the inner diameter of the second seal fixing tube 16 is 2.4 mm or more.

Optionally, the second seal-fixing tube 16 is a glass tube.

Alternatively, the second sealing fixing tube 16 is a thin tube made of other materials, such as a metal tube, a plastic tube, etc., and the specific parameters of the second sealing fixing tube 16, such as the length and the outer diameter, are not limited to specific values.

In this embodiment, the second sealing fixing tube 16 is used to protect the first sealing fixing tube 15, the first self-focusing lens 11, the second self-focusing lens 12, the first optical fiber pigtail 13, and the second optical fiber pigtail 14, and at the same time, fix the relative positions of the components to prevent the optical path glue from being denatured by external factors. The first sealing and fixing tube 15 uses a glass tube to increase the selection range of the optical path glue, i.e. the optical path glue can use light-curing glue. In addition, selecting a glass tube having an outer diameter of 2.4 mm as the first seal fixing tube 15 can further reduce the size of the wavelength division multiplexing device 1 while securing the fixing effect.

Referring to fig. 1, the wavelength division multiplexing device 1 further includes a sealant 18, and two ends of the second sealing fixing tube 16 are sealed by the sealant 18 to prevent external factors from affecting the performance of the optical path adhesive; meanwhile, the sealant 18 is also used for fixing the first optical fiber pigtail 13 and the second optical fiber pigtail 14.

With the above scheme, one case of the optical signal being conducted in the wavelength division multiplexing device is shown in fig. 5, 6, and 7.

Referring to fig. 5, one of the optical fibers of the second optical fiber pigtail 14 transmits an optical signal, and the optical signal enters the optical fiber pigtail 172 through the interface between the second optical fiber pigtail 14 and the optical fiber pigtail 172, because the refractive index of the optical fiber pigtail 172 is similar to that of the connector of the second optical fiber pigtail 14, the reflection of the optical signal at the interface between the optical fiber pigtail 172 and the second optical fiber pigtail 14 is greatly reduced, and the interface between the optical fiber pigtail 172 and the second optical fiber pigtail 14 is not vertical, so the optical signal is not vertically incident, and therefore the reflected optical signal does not enter any optical fiber of the second optical fiber pigtail 14, and the transmission of the optical signal is not affected.

Referring to fig. 5, the optical signal enters the second self-focusing lens 12 through the interface between the optical path glue 172 and the second self-focusing lens 12, because the relative refractive index between the optical path glue 172 and the second self-focusing lens 12 is smaller than the relative refractive index between the self-focusing lens and the air, the reflection of the optical signal at the interface between the optical path glue 172 and the second self-focusing lens 12 is reduced, because the interface between the second self-focusing lens 12 and the optical path glue 172 is not a vertical plane, the optical signal is not a vertical incidence, and therefore the reflected optical signal does not enter any optical fiber of the dual-fiber pigtail 14, and the transmission of the optical signal is not affected. After entering the second self-focusing lens 12, the optical signal is separated into two or more parallel optical signals by the second self-focusing lens 12.

Referring to fig. 6, the separated parallel optical signals enter the optical path adhesive 17 through the interface between the second self-focusing lens 12 and the optical path adhesive 17, and because the relative refractive index between the optical path adhesive 172 and the second self-focusing lens 12 is smaller than the relative refractive index between the second self-focusing lens 12 and the air, the reflection of the optical signals at the interface between the optical path adhesive 172 and the second self-focusing lens 12 is reduced.

Referring to fig. 6, since the filter 10 is coated with the WDM film, the optical signal with a specific wavelength is reflected by the WDM film and enters the other fiber of the dual fiber pigtail through the optical path glue 17, the second self-focusing lens 12 and the optical path glue 172, and the optical signals with the other wavelengths enter the filter 10.

Referring to fig. 7, the separated parallel optical signals enter the optical path glue 17 through the interface between the filter 10 and the optical path glue 17, because the refractive indexes of the optical path glue 17 and the filter 10 are close, the relative refractive index is much smaller than the relative refractive index between the filter 10 and the air, and the reflection of the optical signals at the interface between the optical path glue 17 and the filter 10 is reduced.

Referring to fig. 7, the separated parallel optical signals enter the first self-focusing lens 11 through the interface between the optical path glue 17 and the first self-focusing lens 11, and because the relative refractive index between the optical path glue 17 and the first self-focusing lens 11 is smaller than the relative refractive index between the self-focusing lens and air, the reflection of the optical signals at the interface between the optical path glue 17 and the first self-focusing lens 11 is reduced; the separated parallel optical signals are coupled into one optical signal by the first self-focusing lens 11.

With reference to fig. 7, the coupled optical signal enters the optical path adhesive 171 through the interface between the first self-focusing lens 11 and the optical path adhesive 171, and because the relative refractive index between the first self-focusing lens 11 and the optical path adhesive 171 is smaller than the relative refractive index between the first self-focusing lens 11 and the air, the reflection of the optical signal at the interface between the first self-focusing lens 11 and the optical path adhesive 171 is reduced; the optical signal enters the optical fiber of the first optical fiber pigtail 13 through the interface of the optical path adhesive 171 and the first optical fiber pigtail 13, and because the relative refractive index of the optical path adhesive 171 and the connector of the first optical fiber pigtail 13 is smaller than the relative refractive index of the connector of the first optical fiber pigtail 13 and air, the reflection of the optical signal at the interface of the optical path adhesive 171 and the first optical fiber pigtail 13 is reduced.

To sum up, the optical wave multiplexer that this application embodiment provided need not additionally to plate the antireflection coating for each accessory, can reduce cost, does not have the precision requirement to the optical path glue hardly moreover, can further reduce cost, in addition through the optical path gluing splice together between each accessory, the optical path glue occupies the space very little, so reduced whole wavelength division multiplexer's size.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. A wavelength division multiplexing device, comprising:

a first self-focusing lens having a pitch of one quarter or an odd multiple of one quarter;

a second self-focusing lens having a pitch of one quarter or an odd multiple of one quarter;

the filter is arranged between the first self-focusing lens and the second self-focusing lens and is respectively bonded with the first self-focusing lens and the second self-focusing lens through optical path glue; wherein the refractive index of the optical path glue is greater than that of air.

2. A wavelength division multiplexing device according to claim 1, wherein the filter comprises:

the relative refractive index of the substrate and the optical path glue is smaller than that of the substrate and the air;

a WDM film plated on the substrate surface.

3. The WDM device of claim 2, wherein said WDM film is plated on one end surface of said substrate, or said WDM film is plated on both end surfaces of said substrate.

4. The wavelength division multiplexing device according to claim 1, further comprising:

the first sealed fixed pipe, first from focusing lens with the bonding department of filter plate the second from focusing lens with the bonding department of filter plate is located in the first sealed fixed pipe, the filter plate first from focusing lens the second from focusing lens with first sealed fixed pipe passes through the light path and glues fixedly.

5. The WDM device according to claim 4, wherein the first sealing and fixing tube is a glass tube having an outer diameter of 2.4 mm.

6. The wavelength division multiplexing device of claim 4, wherein the wavelength division multiplexing device further comprises:

the connector of the first optical fiber pigtail is bonded with the first self-focusing lens through optical path glue, and the relative refractive index of the connector of the first optical fiber pigtail and the optical path glue is smaller than that of the connector of the first optical fiber pigtail and the air;

the second optic fibre tail optical fiber, the connector of second optic fibre tail optical fiber with the second is glued through the light path and is bonded from focusing lens, the connector of second optic fibre tail optical fiber with the relative refractive index that the light path was glued is less than the connector of second optic fibre tail optical fiber with the relative refractive index of air.

7. The wavelength division multiplexing device of claim 6, wherein the wavelength division multiplexing device further comprises:

the sealed fixed pipe of second, first optic fibre pigtail connector the second optic fibre pigtail connector first sealed fixed pipe set up in the sealed fixed pipe of second is intraductal.

8. The wavelength division multiplexing device according to claim 7, wherein two ends of the second sealing/fixing tube are sealed with a sealant, the sealant is used to prevent external factors from affecting the optical path glue, and the sealant is further used to fix the first optical fiber pigtail and the second optical fiber pigtail.

9. The wdm device according to claim 7, wherein the second sealing fixing tube is a glass tube having an outer diameter of 3.2 mm.

10. The wdm device of claim 1, wherein the filter thickness is 0.8 mm.

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