CN212031782U

CN212031782U - Wavelength division multiplexer

Info

Publication number: CN212031782U
Application number: CN202020454138.XU
Authority: CN
Inventors: 刘征; 陈松; 陈笑
Original assignee: Sichuan Haoxun Photoelectric Technology Co ltd
Current assignee: Zhuhai Haoxun Optoelectronic Technology Co ltd
Priority date: 2019-12-25
Filing date: 2020-04-01
Publication date: 2020-11-27
Anticipated expiration: 2030-04-01

Abstract

The utility model provides a wavelength division multiplexer, including outer glass sleeve pipe, binary channels collimator to and the branch is listed as first, the second single fiber collimator at binary channels collimator both ends. By adopting the wavelength division multiplexer with the structure, all wavelength optical signals are input through the common end input optical fiber, the optical signal with a certain specific dense wavelength division multiplexing wavelength is output through the rear transmission end optical fiber of the device, and the signals with other wavelengths are all isolated; meanwhile, the optical signal with another dense wavelength division multiplexing wavelength is output from the reflection end output optical fiber through the device rear transmission end optical fiber, and the optical signals with other wavelengths are all isolated. Meanwhile, the filter has the filtering function. The optical splitting/combining and filtering functions of two different signal channels are simultaneously completed by using one device, half of physical space is saved compared with the traditional product, and one-time cascade operation is omitted, so that the system space is saved and the network building process is simplified.

Description

Wavelength division multiplexer

Technical Field

The utility model belongs to realize the components and parts wavelength division multiplexer that signal goes upward/down, wavelength division multiplexing/demultiplexing function in the optical communication network.

Background

The wavelength division multiplexer combines a series of optical signals which carry information and have different wavelengths into one beam and transmits the beam along a single optical fiber; and separating the optical signals with different wavelengths by a certain method at the receiving end. This technique allows multiple signals to be simultaneously transmitted over an optical fiber, each signal being carried by light of a particular wavelength, which is a wavelength channel. Wavelength division multiplexers are optical fiber communication components that combine optical signals of different wavelengths into one beam or decompose optical signals of multiple wavelengths on one optical fiber, and can be generally divided into coarse wavelength division multiplexers and dense wavelength division multiplexers according to the size of channel separation distances. It is an important passive device in an optical fiber communication system and is widely applied to various links of optical signal transmission. At present, 5G optical networks are almost constructed all over the world, and the 5G optical networks have higher transmission frequency compared with the previous generations of optical fiber communication systems, so that higher bandwidth requirements can be met, but the higher transmission frequency also causes the need of greater base station density. And a large batch of wavelength division multiplexing systems need to be laid in the transmission process between the base station and the access network. In consideration of the fiber dispersion characteristics and the higher bandwidth requirement, the 5G systems in many countries use dense wavelength division multiplexing systems in the signal forwarding link, for example, korean. Because the density of the 5G base stations is higher, the physical structure of the base stations is smaller than that of the prior art in consideration of the economical efficiency and the aesthetic property of the base stations, so that the structure of the wavelength division multiplexing system in the base stations is required to be more compact, and correspondingly, higher requirements are put forward on the size of the wavelength division multiplexing components.

A typical wavelength division multiplexing system is divided into two links: and multiplexing and demultiplexing links. The multiplexing link is that a plurality of carrier signals with different wavelengths are merged into one optical fiber for transmission through a wavelength division multiplexer; the demultiplexing link is to separate a plurality of wavelength carrier signals contained in one optical fiber by a wavelength division multiplexer. The above-mentioned light combination/splitting is a basic function of the wavelength division multiplexer. In addition, the problems of signal noise and interference of signals with different wavelengths are also considered in the multiplexing and demultiplexing processes, and particularly, the demultiplexing link must ensure that the decomposed signals are free from other wavelength noise. The general method is to use the thin film filter type wavelength division multiplexer to filter signals, and the thin film filter type wavelength division multiplexer is limited by the coating process to have better filtering characteristics only in a transmission light path, so that when demultiplexing two wavelength signals with different wavelengths, two wavelength division multiplexers with corresponding wavelengths need to be cascaded to perform light division and filtering, and the occupied volume is larger.

SUMMERY OF THE UTILITY MODEL

Based on the above problem, an object of the present invention is to provide a wavelength division multiplexing device. In order to realize the above purpose, the utility model discloses a technical scheme be: the device comprises an outer glass sleeve, a double-channel collimator, a first single-fiber collimator and a second single-fiber collimator, wherein the first single-fiber collimator and the second single-fiber collimator are respectively arranged at two ends of the double-channel collimator; the double-channel collimator comprises a double-end tail fiber, the double-fiber tail fiber on one side of the double-end tail fiber is sequentially connected with a first lens and a first optical filter, and the first optical filter is opposite to the first single-fiber collimator; the single fiber pigtail on the other side of the double-end pigtail is sequentially connected with a second lens and a second optical filter, the second optical filter is opposite to the second single fiber collimator, and the single fiber pigtail and the second lens are fixedly sleeved in a second sleeve; the double-fiber tail fiber is fixedly sleeved in the first sleeve; two ends of the first outer sleeve are respectively bonded and fixed with the first sleeve and a third sleeve of the first single-fiber collimator; two ends of the second outer sleeve are respectively bonded and fixed with the second sleeve and a fourth sleeve of the second single-fiber collimator; two ends of the metal sleeve are fixedly connected with the first outer sleeve and the second outer sleeve respectively; the two ends of the outer glass sleeve are fixedly sleeved outside the first outer sleeve and the second outer sleeve.

By adopting the wavelength division multiplexer with the structure, the two sections of wavelength division multiplexers are packaged into a dual-channel wavelength division multiplexer through the glass sleeve, so that all wavelength optical signals are input from the common end input optical fiber of the device, the optical signals with a certain dense wavelength division multiplexing wavelength are output from the rear transmission end optical fiber of the device, and the signals with other wavelengths are all isolated; meanwhile, the optical signal with another dense wavelength division multiplexing wavelength is output from the reflection end output optical fiber through the device rear transmission end optical fiber, and the optical signals with other wavelengths are all isolated. Therefore, the light splitting/combining function of two different standard dense wavelength division multiplexing wavelengths is realized in an independent device, and the optical filter at each transmission output port enables the device to have the filtering function.

The utility model discloses a binary channels collimator realizes according to wavelength beam split, filtering and the function of beam collimation. The single optical fiber tail fiber, the spherical lens and the glass sleeve are sequentially combined together to form a single optical fiber collimator, so that the function of beam collimation is realized. The double-channel collimator and the single-fiber collimator are combined together by means of the glass sleeve, and the functions of light splitting and filtering of two paths of optical signals are achieved simultaneously. And finally, packaging the whole component into a whole by using a metal sleeve to manufacture an independent double-channel dense wavelength division multiplexer device.

Furthermore, the first lens is a self-focusing lens, and the second lens is a spherical lens. In particular, the focal point of each lens is located at section 1/4 from the end face of the self-focusing, spherical lens.

Furthermore, the first and second filters are respectively adhered to the first and second lens planes. In particular the filter is a thin film filter.

The optical filter further comprises a wedge-shaped glass tube, the plane end of the wedge-shaped glass tube is sleeved at the spherical end of the spherical lens, and the second optical filter is bonded with the inclined plane of the wedge-shaped glass tube.

Double-end tail fibers connected end to end, 1/4-pitch self-focusing lenses and spherical lenses with the focus positioned on the end surface, a thin film optical filter for realizing the separation function of the dense wavelength division multiplexing signals in a film coating mode, and a wedge-shaped glass tube with an inclination angle at one side form a double-channel collimator, the independent optical fibers of the double-channel collimator are used as a common end for transmitting all signals, after all the signals pass through the collimator, the signals which accord with the wavelength of a certain dense wavelength division multiplexing channel are changed into collimated beams to be output from one side, the other dense wavelength division multiplexing wavelength signals are changed into the collimated beams to be output from the other side,

furthermore, the double-fiber pigtail comprises a double-fiber ciliated thin glass tube, one end of the public end input fiber and one end of the reflection end output fiber are respectively arranged in two capillary holes of the double-fiber ciliated thin glass tube, and the end surfaces of the public end input fiber and the reflection end output fiber are polished and coated with films; the single fiber pigtail comprises a single ciliated thin glass tube, and the other end of the reflecting end output fiber is arranged in a capillary hole of the single ciliated thin glass tube.

The double-fiber capillary tube with the double-hole structure, the single-fiber capillary tube and the two optical fibers are combined into the double-end tail fiber with the single-fiber tail fiber on one side and the double-fiber tail fiber on the other side, the optical fiber number input by the independent optical fiber is ensured to be input from the double-fiber tail fiber, the optical signal processed by other structures is output from the other optical fiber of the double-fiber tail fiber and enters the single-fiber tail fiber, different signal processing structures on two sides are connected with each other, and a new integral structure is formed.

The utility model discloses a film filter type binary channels wavelength division multiplexer has used a device to accomplish the beam split/of two different signal channels simultaneously/closes light and filtering capability, compares traditional product and has saved half physical space, has saved a cascade operation simultaneously, has saved system space promptly and has simplified the network establishment process again.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the dual-channel DWDM device of the present invention,

FIG. 2 is a schematic diagram of an exploded structure of the double-ended tail fiber of the present invention,

FIG. 3 and FIG. 4 are schematic exploded structural views of single fiber pigtails of the present invention,

figure 5 is a schematic diagram of the dual-channel collimator of the present invention,

fig. 6 and 7 are schematic structural diagrams of a single fiber collimator according to the present invention.

Legends for the main parts of the drawings

100

metal sleeve

200, 300 glass sleeve

401. 402, 501 and 601, optical fiber 404, double-light ciliated thin glass tube

403. 502, 602 single ciliated thin glass tube 406 self-focusing lens

405. 503, 603 spherical lens

407. 408 dense wavelength division multiplexing thin film filter

410. 411, 504, 604 collimator glass sleeve 409 wedge glass tube.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Fig. 1 is the overall structure diagram of the present invention, fig. 2, fig. 3 and fig. 4 are the assembly diagrams of the double-ended pigtail and two single-fiber pigtails of the present invention, and fig. 5, fig. 6 and fig. 7 are the structural diagrams of the dual-channel collimator and the left and right single-fiber collimators.

Referring to the drawings, the dense wavelength division multiplexing device of the present example includes a metal sleeve (100) outer glass sleeve (200, 300), a dual-channel collimator (fig. 5), a single-fiber collimator (fig. 6, 7).

The independent optical fiber (401) of the dual-channel collimator (figure 5) is used as a signal input common end, after passing through the collimator, a signal which accords with the wavelength of a specific dense wavelength division multiplexing channel is output in a form of collimated light from the front end of the thin film filter (408), and other residual wavelength signals are output in a form of collimated light from the front end of the thin film filter (407) on the other side of the dual-channel collimator. The optical signal emitted from the front end of the thin film filter (408) is applied to the spherical end surface of the ball lens (603) of the single fiber collimator (fig. 7), and then the optical signal is output from the optical fiber (601) of the single fiber collimator (fig. 7) through mechanical adjustment. The outer glass sleeve (300) is sleeved outside the double-channel collimator (shown in figure 5) and the single optical fiber collimator (shown in figure 7), the inner walls of two ends of the outer glass sleeve (300) are coated with glue, so that two ends of the outer glass sleeve are respectively bonded and fixed with the glass sleeve (411) of the double-channel collimator (shown in figure 5) and the glass sleeve (604) of the single optical fiber collimator (shown in figure 7), the relative positions of the double-channel collimator (shown in figure 5) and the single optical fiber collimator (shown in figure 7) are fixed, meanwhile, the optical signal transmission path of the dense wavelength division multiplexing device is sealed and protected, and the optical signal transmission is prevented from being influenced by pollutants such as dust, water vapor and the. The optical signal emitted from the front end of the thin film filter (407) is applied to the spherical end surface of the ball lens (503) of the single optical fiber collimator (fig. 6), and then the optical signal is output from the optical fiber (501) of the single optical fiber collimator (fig. 6) through mechanical adjustment. The outer glass sleeve (200) is sleeved outside the double-channel collimator (shown in figure 5) and the single-fiber collimator (shown in figure 6), the inner walls of two ends of the outer glass sleeve (200) are coated with glue, so that two ends of the outer glass sleeve are respectively bonded and fixed with the glass sleeve (410) of the double-channel collimator (shown in figure 5) and the glass sleeve (504) of the single-fiber collimator (shown in figure 6), the relative positions of the double-channel collimator (shown in figure 5) and the single-fiber collimator (shown in figure 6) are fixed, meanwhile, the optical signal transmission path of the dense wavelength division multiplexing device is sealed and protected, and the influence of pollutants such as dust, water vapor and the like on optical signal transmission is avoided.

The utility model provides a binary channels collimater (fig. 5) contains double-end tail optical fiber (fig. 2), self-focusing lens (406), spherical lens (405), thin film filter (407, 408), wedge glass pipe (409) and glass sleeve (410, 411).

The thin film filter (408) is closely adhered to the plane of the self-focusing lens (406) through glue, namely a dense wavelength division multiplexing transflective film is formed at the plane of the self-focusing lens (406), when an optical signal passes through the film surface, the optical signal which accords with the wavelength of a special dense wavelength division multiplexing channel passes through the film layer, and all optical signals with other wavelengths are reflected and cannot pass through the film layer. Then, the inclined plane of the self-focusing lens (406) of the film optical filter (408) is well bonded to the inclined plane of the double-optical ciliated thin glass tube (404) of the double-ended tail fiber (figure 2), the relative positions of the two are adjusted to meet the requirements that when an optical signal is input into the independent optical fiber (401) of the double-ended tail fiber (figure 2), the signal reaches the optical filter (408) through the self-focusing lens (406), a specific wavelength signal passes through the optical filter for collimation output, other wavelength optical signals are reflected and output from the optical fiber (402), and then the self-focusing lens (406) and the inclined plane of the double-optical ciliated thin glass tube (404) are bonded by glue water, so that the relative positions of the two are fixed. The glass sleeve (411) is sleeved outside the double-light ciliated thin glass tube (404) and is firmly bonded. Putting the spherical lens (405) and the inclined plane of the single-fiber capillary tube (403) of the double-ended tail fiber (figure 2) into a glass sleeve (410) in a co-worker manner, adjusting the distance between the spherical lens (405) and the single-fiber capillary tube (403) to ensure that the central point of the inclined plane of the single-fiber capillary tube (403) is positioned at the focal point of the spherical lens (405), and fixing the spherical lens (405) and the single-fiber capillary tube (403) in the glass sleeve (410) through glue. The thin film optical filter (407) is tightly adhered to the inclined plane of the wedge-shaped glass tube (409) through glue, and the plane end of the wedge-shaped glass tube (409) is sleeved on the spherical end of the spherical lens (405). When optical signals are input into the optical fiber (402), the signals reach the surface of the thin film optical filter (407) after being collimated by the spherical lens (405), the wedge-shaped glass tube (409) is rotated to enable the optical signals meeting the wavelength of a certain special dense wavelength division multiplexing channel to be output through collimation of the film layer, all optical signals with other wavelengths are isolated and filtered, and then the wedge-shaped glass tube (409) and the spherical lens (405) are fixed by glue and are firmly bonded.

The single fiber collimator of the present invention (fig. 6 and 7) comprises a single fiber pigtail (fig. 3 and 4), a ball lens (503 and 603), and a glass sleeve (504 and 604).

The single fiber collimator (fig. 6 and 7) is used for receiving two collimated light signals with different wavelengths from the dual-channel collimator (fig. 5), and needs to meet the requirement of low-loss reception at the same time. To satisfy the above function, the spot size and the divergence angle of the two optical signals of the single fiber collimator (fig. 6 and 7) need to be identical to those of the two optical signals transmitted from the optical filters (407 and 408) by the two-channel collimator (fig. 5). To meet the requirement, the ball lens (503, 603) is opposite to the inclined surface of the single-fiber ciliated thin glass tube (502, 602) and is arranged in the glass sleeve (504, 604), the relative position is adjusted, the light beam property of the ball lens is completely consistent with that of two light signals transmitted by the dual-channel collimator (figure 5) from the optical filters (407, 408), and the ball lens is sealed and fixed by glue.

The double-ended pigtail (fig. 2) of the present invention comprises a double-fiber ciliated thin glass tube (404), a single-fiber capillary tube (403), and two optical fibers (401, 402). The optical fibers (401, 402) are respectively arranged in two capillary holes of the double-optical fiber ciliated thin glass tube (404), and are bonded and fixed by glue, and the end faces are polished and coated with films; the other end of the optical fiber (402) is placed in the capillary hole of the single ciliated thin glass tube (403), and is bonded and fixed by glue, and the end face is polished and coated with a film, so that the double-end tail fiber is formed (figure 2).

The double-ended pigtail (fig. 2) serves two purposes. One is that the optical fiber is fixed, which is convenient for subsequent operation, and because the optical fiber is thin and brittle, if the optical fiber is directly operated, the optical fiber is extremely easy to damage and not easy to fix, the subsequent operations such as grinding, film coating, adjustment and the like can be more convenient after the optical fiber is fixed by using the capillary glass tubes (403, 404); the second function is to fix the relative positions of the two optical fibers (401, 402) so that the optical signal with the specific wavelength reflected by the thin film filter (408) can be accurately guided into the optical fiber (402).

The single fiber pigtail (fig. 3 and 4) of the present invention comprises a single ciliated thin glass tube (502, 602) and an optical fiber (501, 601). The optical fibers (501, 601) are respectively arranged in the capillary holes of the single-fiber ciliated thin glass tubes (502, 602), and are bonded and fixed by glue, and the end faces are polished and coated with films, so that the single-fiber tail fiber is formed. The optical fiber fixing device has the main function of fixing the optical fiber, and is convenient for subsequent operations such as grinding, coating, adjusting and the like of the optical fiber.

The double-channel collimator comprises a dense wavelength division multiplexing optical filter, a self-focusing lens, a spherical lens, a double-end tail fiber, a single-fiber tail fiber, a glass sleeve, a metal sleeve and a wedge-shaped glass tube. The self-focusing lens is combined with the double-fiber tail fiber in the double-end tail fiber to realize the collimation of the light beam and converge on the end surface of the self-focusing lens; the optical filter is combined with the parts to realize the uplink and downlink functions of optical signals with different wavelengths; the glass sleeve is installed to facilitate subsequent operation. The spherical lens and the single-fiber tail fiber in the double-end tail fiber are combined together through a glass sleeve to realize the collimation of the light beam; the filter is combined with the above parts through a wedge-shaped glass tube to realize the filtering function of a specific channel. The single-fiber collimator comprises a ball lens, a single-fiber tail fiber and a glass sleeve. The ball lens and the single optical fiber tail fiber are combined together through the glass sleeve tube, so that the light beams are collimated and converged in front of the ball lens. The double-channel collimator and the single-fiber collimator are aligned according to the light path and combined together through the glass sleeve, so that two optical signals are respectively output from the ports of the left single-fiber collimator and the right single-fiber collimator according to different wavelengths.

As described above, the utility model discloses an optical signal is according to intensive wavelength division multiplexing wavelength selection, corresponds wavelength optical signal from different port output or input respectively, and has realized the filtering function to output signal simultaneously. The optical splitting/combining and filtering functions in the dense wavelength division multiplexing system are simultaneously satisfied by using one device. The size of the demultiplexing module in the system is reduced by half, and the system cost can be reduced.

The above embodiments of the present invention are merely examples for illustrating the present invention and are not intended to limit the embodiments of the present invention. Variations and modifications in other variations will occur to those skilled in the art upon reading the foregoing description. Not all embodiments are exhaustive. All obvious changes or variations which are introduced by the technical solution of the present invention are still within the scope of the present invention.

Claims

1. A wavelength division multiplexer comprises an outer glass sleeve, a double-channel collimator, a first single-fiber collimator and a second single-fiber collimator, wherein the first single-fiber collimator and the second single-fiber collimator are arranged at two ends of the double-channel collimator in a splitting mode; the method is characterized in that:

the double-channel collimator comprises a double-end tail fiber, the double-fiber tail fiber on one side of the double-end tail fiber is sequentially connected with a first lens and a first optical filter, and the first optical filter is opposite to the first single-fiber collimator; the single fiber pigtail on the other side of the double-end pigtail is sequentially connected with a second lens and a second optical filter, the second optical filter is opposite to the second single fiber collimator, and the single fiber pigtail and the second lens are fixedly sleeved in a second sleeve; the double-fiber tail fiber is fixedly sleeved in the first sleeve;

two ends of the first outer sleeve are respectively bonded and fixed with the first sleeve and a third sleeve of the first single-fiber collimator;

two ends of the second outer sleeve are respectively bonded and fixed with the second sleeve and a fourth sleeve of the second single-fiber collimator; two ends of the metal sleeve are fixedly connected with the first outer sleeve and the second outer sleeve respectively;

the two ends of the outer glass sleeve are fixedly sleeved outside the first outer sleeve and the second outer sleeve.

2. The wavelength division multiplexer according to claim 1, further comprising a common port input fiber and a reflection port output fiber, one ends of the common port input fiber and the reflection port output fiber being disposed in the dual fiber pigtail, respectively; the other end of the reflecting end output optical fiber is arranged in the single fiber tail fiber.

3. The wavelength division multiplexer according to claim 1, wherein the first and second single-fiber collimators are sequentially combined by a single-fiber pigtail, a lens and a glass sleeve to form a single-fiber collimator.

4. The wavelength division multiplexer according to claim 1, wherein the first lens is a self-focusing lens and the second lens is a spherical lens.

5. The wavelength division multiplexer according to any one of claims 1 to 4, wherein the first and second filters are bonded to the first and second lens planes, respectively, the filters being thin film filters.

6. The wavelength division multiplexer according to any one of claims 1 to 4, further comprising a wedge-shaped glass tube, wherein a planar end of the wedge-shaped glass tube is fitted over a spherical end of the spherical lens, and the second optical filter is bonded to an inclined surface of the wedge-shaped glass tube.

7. The wavelength division multiplexer according to any one of claims 1 to 4, wherein the dual fiber pigtail comprises a dual ciliated thin glass tube, one end of the common end input fiber and one end of the reflection end output fiber are respectively disposed in two capillary holes of the dual ciliated thin glass tube, and the end faces thereof are polished and coated with a film; the single fiber pigtail comprises a single ciliated thin glass tube, and the other end of the reflecting end output fiber is arranged in a capillary hole of the single ciliated thin glass tube.

8. The wavelength division multiplexer according to claim 2, wherein the other end of the common port input optical fiber exits from the second single-fiber collimator tip.

9. The wavelength division multiplexer according to claim 6, wherein the inclined surface of the self-focusing lens is opposed to and fixedly attached to the inclined surface of the double-photo ciliated thin glass tube.

10. The wavelength division multiplexer according to claim 6, wherein the focal point of each lens is located at section 1/4 from the self-focusing lens, spherical lens end face.