CN214750932U

CN214750932U - Wavelength division multiplexer

Info

Publication number: CN214750932U
Application number: CN202121179605.3U
Authority: CN
Inventors: 刘继亮
Original assignee: Hebi Tengtianguang Communication Technology Co ltd
Current assignee: Hebi Tengtianguang Communication Technology Co ltd
Priority date: 2021-05-30
Filing date: 2021-05-30
Publication date: 2021-11-16
Anticipated expiration: 2031-05-30

Abstract

The utility model provides a wavelength division multiplexer, including the interior sleeve pipe of both ends open-ended, be fixed with coaxial first glass pipe in the left side open end of interior sleeve pipe, be equipped with three optic fibre pigtails in the first glass pipe, the light path direction of three optic fibre pigtails is to having the focusing lens that carries out the light path collimation to the optical signal, and another tip of focusing lens is to having the light filter; the inner sleeve is characterized in that a coaxial second glass tube is fixed in the right opening end of the inner sleeve, a reflecting rod and an adjusting rod are sequentially arranged in the second glass tube, the reflecting rod is arranged on one side close to the optical filter, and a reflecting film is arranged at one end, close to the optical filter, of the reflecting rod. The wavelength division multiplexer adopts three optical fiber pigtails with single end outgoing fiber to replace the existing double optical fiber pigtail and single optical fiber pigtail, thereby reducing the cost of raw materials; meanwhile, the inner sleeve is in threaded connection with the first glass tube, so that the glass tube can be quickly installed, and time is saved; in addition, through the design of pyrocondensation pipe and elastic rubber pipe, can guarantee the leakproofness, can increase the anti falling ability of antidetonation of whole device again.

Description

Wavelength division multiplexer

Technical Field

The utility model relates to an optical communication technical field, concretely relates to wavelength division multiplexer.

Background

Wavelength division multiplexing WDM is that a series of optical signals which carry information and have different wavelengths are combined into a beam and transmitted along a single optical fiber; at the receiving end, the optical signals of different wavelengths are separated by some method. WDM systems are classified by channel capacity into two categories: 1. sparse wavelength division multiplexing (CWDM): the wavelength interval is large, and is generally 20 nm; 2. dense Wavelength Division Multiplexing (DWDM): the wavelength interval is small and is less than or equal to 0.8 nm. The CWDM wavelength division multiplexer is usually made by cascading separately packaged three-port wavelength division multiplexers and then using as a multi-channel multi-port wavelength division multiplexing device; three-port wavelength division multiplexers belong to the important components of CWDM wavelength division multiplexers.

Disclosure of Invention

The utility model provides a convenient assembly, and go into light and light-emitting all are in with the wavelength division multiplexer of one side.

The utility model adopts the technical proposal that: a wavelength division multiplexer comprises an inner sleeve with openings at two ends, a coaxial first glass tube is fixed in the left opening end of the inner sleeve, three optical fiber tail fibers are arranged in the first glass tube, a focusing lens for collimating optical signals in an optical path is butted in the optical path direction of the three optical fiber tail fibers, and an optical filter is butted at the other end of the focusing lens; the inner sleeve is characterized in that a coaxial second glass tube is fixed in the right opening end of the inner sleeve, a reflecting rod and an adjusting rod are sequentially arranged in the second glass tube, the reflecting rod is arranged on one side close to the optical filter, and a reflecting film is arranged at one end, close to the optical filter, of the reflecting rod.

Preferably, the left opening end and the right opening end of the inner sleeve are both in a step-shaped structure, and the first glass tube and the second glass tube are in a convex structure matched with the opening ends.

Preferably, the left part of the first glass tube is screwed into the inner sleeve, and the heat shrinkable tube is sleeved on the right part of the first glass tube and the outer side of the left part of the second glass tube.

Preferably, an elastic rubber tube having an outer diameter equal to an inner diameter of the sleeve is provided outside the focus lens.

Preferably, the sealing device further comprises an outer sleeve, the inner sleeve is arranged in the outer sleeve, and sealing covers for sealing the inner sleeve are arranged at two ends of the outer sleeve.

Compared with the prior art, the beneficial effects of the utility model reside in that: the wavelength division multiplexer of the utility model adopts three optical fiber pigtails with single end outgoing fiber to replace the existing double optical fiber pigtail and single optical fiber pigtail, thus reducing the cost of raw materials; meanwhile, the inner sleeve is in threaded connection with the first glass tube, so that the glass tube can be quickly installed, and time is saved; in addition, through the design of pyrocondensation pipe and elastic rubber pipe, can guarantee the leakproofness, can increase the anti falling ability of antidetonation of whole device again.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

In the figure: 1. an outer sleeve; 2. a glass inner sleeve; 3. a first glass tube; 4. three optical fiber pigtails; 5. a focusing lens; 6. an optical filter; 7. a second glass tube; 8. a reflective rod; 9. an adjusting rod; 10. heat shrink tubing; 11. an elastic rubber tube; 12. and (7) sealing the cover.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.

Referring to fig. 1, the wavelength division multiplexer of the present invention includes a glass inner tube 2 with two open ends, a first glass tube 3 fixed in the left open end of the glass inner tube 2, three optical fiber pigtails 4 disposed in the first glass tube 3, the three optical fiber pigtails including three optical fibers, the three optical fiber arrays being arranged in a three-core capillary, the three-core capillary being a glass three-core capillary, the end face of the three-core capillary being L-shaped or delta-shaped, one optical fiber of the three optical fibers being used as the input end (or output end), the other two optical fibers being used as the output end (or input end), the end face of the three optical fiber pigtails being 8 ° face and covered with an anti-reflection film, a focusing lens 5 for collimating the optical path of the optical signal being butt-jointed in the optical path direction, the focusing lens 5 including glass and anti-reflection films disposed at the first end and the second end of the glass, the first end connected with the tail part of the three optical fiber pigtails is an 8-degree surface, the second end far away from the three optical fiber pigtails is a plane, the second end is butted with the optical filter 6, the focal length of the second end is the thickness of the optical filter, and one end of the optical filter far away from the focusing lens is covered with a filter film capable of filtering out corresponding wavelengths; a coaxial second glass tube 7 is fixed in the right opening end of the glass inner sleeve, a reflecting rod 8 and an adjusting rod 9 are sequentially arranged in the second glass tube 7, the reflecting rod is cylindrical glass and is arranged on one side close to the optical filter, and a reflecting film is arranged at one end, close to the optical filter, of the reflecting rod 8. When the second glass tube assembly is manufactured, the distance between the reflecting rod and the optical filter is adjusted by moving the adjusting rod back and forth.

In this embodiment, the left side open end and the right side open end of glass interior sleeve pipe all design and are step-like structure, first glass pipe and second glass pipe for with the protruding type structure of open end assorted, this structure is in order to carry on spacingly, convenient and fast assembly to first glass pipe and second glass pipe.

In addition, an internal thread is arranged on the inner side of the left opening end of the glass inner sleeve, an internal thread is arranged on the outer side of the left part of the first glass tube, the left part of the first glass tube is in threaded connection with the inner sleeve, a heat-shrinkable tube 10 is sleeved on the right part of the first glass tube and the outer side of the left part of the second glass tube, the heat-shrinkable tube is equal to the inner diameter of the inner sleeve or slightly larger than the inner diameter of the inner sleeve after being shrunk, the first glass tube and the second glass tube can be conveniently screwed into the inner sleeve to achieve the sealing effect, and the first glass tube and the second glass tube can be slowly adjusted in the circumferential direction along the inner sleeve through manual rotation. During assembly, the first glass tube assembly is manufactured firstly, so that after multiple paths of optical signals are input, the optical signals with corresponding wavelengths can be transmitted through the filter plate, and the optical signals with the other wavelengths can be output from one path of optical fiber after being reflected; connecting the first glass tube assembly to the left side of the inner sleeve in a threaded manner, penetrating the first glass tube assembly into the second glass tube assembly, and rotating the first glass tube assembly in the circumferential direction to ensure that a transmission light signal can be output from the other path of optical fiber after being reflected by the reflection rod; and after the adjustment is finished, the glue injection fixes the second glass tube assembly on the right side of the inner sleeve.

Meanwhile, the elastic rubber tube 11 is arranged on the outer side of the focusing lens, the outer diameter of the elastic rubber tube 11 is equal to the inner diameter of the sleeve, the elastic rubber tube is conveniently arranged in the inner sleeve, and the elastic rubber tube plays a role in protecting the focusing lens by utilizing elastic buffering.

In addition, the wavelength division multiplexer also comprises an outer sleeve 1 which is a steel pipe, the inner sleeve is arranged in the outer sleeve after the inner sleeve assembly is manufactured, and sealing covers 12 used for plugging the inner sleeve are arranged at the two ends of the outer sleeve.

The preparation process comprises the following steps: the first glass tube assembly is manufactured firstly, so that after multiple paths of optical signals are input, the optical signals with corresponding wavelengths can be transmitted through the filter plate, and the optical signals with the other wavelengths can be output from one path of optical fiber after being reflected; fixing the first glass tube assembly by using a special fixture according to the effective length inside the glass inner sleeve, assembling the reflection rod and the adjusting rod into the second glass tube, fixing the reflection rod without injecting glue, adjusting the distance between the reflection rod and the filter by using the forward and backward movement of the adjusting rod, ensuring that a transmission light signal can be output from the other path of optical fiber after being reflected by the reflection rod, and injecting glue and sealing the reflection rod and the adjusting rod at the same time after determining that the transmission light signal is reflected by the reflection rod; respectively sleeving the first glass tube and the second glass tube assembly which are assembled into the left and right opening ends of the inner sleeve, screwing the first glass tube, circumferentially adjusting the second glass tube to ensure that the light path is accurate, and injecting glue to fix the second glass tube on the inner sleeve through the first glass tube; after curing, the entire assembly was assembled to the outer sleeve and plugged with a sealing cap.

The working principle is as follows: a demultiplexing state: the optical signals with multiple wavelengths are input through an optical fiber, are collimated by the focusing lens and then enter the optical filter, the optical signals with corresponding wavelengths are transmitted from the optical filter, the optical signals with the other wavelengths are reflected and then return through the collimating lens again, and are output through one reflecting optical fiber, the transmitted optical signals enter the reflecting film of the reflecting rod, and are output from the other filtering optical fiber after being reflected and then pass through the collimating lens and the optical filter again, so that the demultiplexing function is completed. Multiplexing state: optical signals with two wavelengths are input through two optical fibers, are collimated by a focusing lens and then enter an optical filter, the optical signals with corresponding wavelengths are transmitted by the optical filter, the optical signals with the rest wavelengths are reflected and then return through a collimating lens again, and are output through a third optical fiber, the transmitted optical signals enter a reflecting film of a reflecting rod, and are output from the third optical fiber after being reflected and then pass through the collimating lens and the optical filter again, so that the multiplexing function is completed.

Claims

1. A wavelength division multiplexer, characterized by: the optical fiber coupler comprises an inner sleeve with openings at two ends, wherein a coaxial first glass tube is fixed in the opening end at the left side of the inner sleeve, three optical fiber tail fibers are arranged in the first glass tube, a focusing lens for collimating optical signals in an optical path is butted in the optical path direction of the three optical fiber tail fibers, and an optical filter is butted at the other end of the focusing lens; the inner sleeve is characterized in that a coaxial second glass tube is fixed in the right opening end of the inner sleeve, a reflecting rod and an adjusting rod are sequentially arranged in the second glass tube, the reflecting rod is arranged on one side close to the optical filter, and a reflecting film is arranged at one end, close to the optical filter, of the reflecting rod.

2. A wavelength division multiplexer according to claim 1, wherein: the left side open end and the right side open end of the inner sleeve are both of stepped structures, and the first glass tube and the second glass tube are of convex structures matched with the open ends.

3. A wavelength division multiplexer according to claim 1, wherein: the left part of the first glass tube is in threaded connection with the inner sleeve, and heat-shrinkable tubes are sleeved on the right part of the first glass tube and the outer side of the left part of the second glass tube.

4. A wavelength division multiplexer according to claim 1, wherein: an elastic rubber tube is arranged on the outer side of the focusing lens, and the outer diameter of the elastic rubber tube is equal to the inner diameter of the sleeve.

5. A wavelength division multiplexer according to claim 1, wherein: the sealing device is characterized by further comprising an outer sleeve, the inner sleeve is arranged in the outer sleeve, and sealing covers used for sealing the inner sleeve are arranged at two ends of the outer sleeve.