CN116256847A - WDM wave division multiplexing module and its making method - Google Patents

Abstract

The invention discloses a WDM wavelength division multiplexing module and a manufacturing method thereof, comprising an outer sleeve, wherein one end of the outer sleeve is provided with an incident three-fiber head, and the other end of the outer sleeve is provided with an emergent single-fiber head; a first lens, a first filter, a second lens and a second filter are arranged between the incidence three-optical-fiber head and the emergent single-optical-fiber head, the first lens is positioned between the incidence three-optical-fiber head and the first filter, and the second lens is positioned between the second filter and the emergent single-optical-fiber head; the incident three-optical-fiber head is internally provided with a first optical fiber, a second optical fiber and a third optical fiber. The invention can increase the reflective isolation capability, reduce the signal interference of adjacent channels, reduce the number of optical fibers, reduce the cost, and has small volume and space-saving WDM wavelength division multiplexing module.

Description

WDM wavelength division multiplexing module and manufacturing method thereof

technical field

The invention relates to the optical module technical field of signal wavelength transmission multiplexing technology in the field of optical fiber communication, in particular to a WDM wavelength division multiplexing module and a manufacturing method thereof.

Background technique

With the increase of communication capacity and the rapid development of data services, it is urgent to solve the problems of capacity expansion and higher and higher bandwidth requirements of the transmission network. At present, the main body of the optical communication market is gradually shifting to the metropolitan area network, and major operators have shifted their focus to the construction of the metropolitan area network. In order to adapt to the high-speed and large-capacity upgrade, especially the high-speed and large-capacity upgrade of the metropolitan area network and access network, In the 5G network, if one optical fiber needs to transmit multiple signals, it needs to be equipped with a wavelength division multiplexer and a demultiplexer to facilitate intensive miniaturization upgrades or transformations, save the number of optical fibers used, and save the cost of laying optical fibers; The demand for using/demultiplexing modules will also increase.

As shown in Figure 1-3, most of the existing WDM modules currently use single-device cascading to coil fibers, and the single-device is mainly a filter-type structure. The wavelength division single device is composed of an outer sleeve 07, a dual-fiber optical fiber head 05, a first lens 03, a filter plate 01, a first lens 04, and a single optical fiber head 06. The transmission wavelength λ 1 is input from the first optical fiber of the dual-fiber optical head, collimated by the first lens, then passes through the filter, and then converges into the optical fiber of the single-fiber collimator through the lens of the single-fiber collimator for transmission, becoming The first signal channel. The function of the filter is to allow the wavelength λ1 to pass through, while other wavelengths λ2 / λ3 ... cannot pass through, that is, other wavelengths are reflected back by the filter, and then converged into the second optical fiber of the dual-fiber fiber head through the lens for transmission, becoming the second , 3, ..., N signal channels. The above solution mainly has the disadvantages of high cost and large space occupation.

Contents of the invention

In order to overcome the deficiencies in the prior art, the object of the present invention is to provide a WDM wavelength division multiplexing module and a manufacturing method thereof.

To achieve the above object, the present invention adopts the following technical solutions:

The WDM wavelength division multiplexing module includes an outer sleeve, one end of the outer sleeve is provided with an incident three-fiber head, and the other end of the outer sleeve is provided with an outgoing single-fiber head;

A first lens, a first filter, a second lens and a second filter are arranged between the incident three-fiber head and the outgoing single-fiber head, and the first lens is located between the incident three-fiber head and the first filter , the second lens is located between the second filter and the outgoing single fiber head;

The incident three-fiber head has a first optical fiber, a second optical fiber and a third optical fiber;

The first filter is a full-wave filter that only transmits the first light wave and the second light wave;

The second filter is a half-wave filter that only transmits the first light wave and reflects light waves of other wavelengths;

After the light enters the first optical fiber of the incident three-fiber head, it passes through the first lens and reaches the first filter. The first filter is transmitted into the second optical fiber of the three-fiber head, and the remaining wavelengths are reflected into the third optical fiber of the three-fiber head through the first filter and the first lens again.

Further, the outer casing is a glass tube.

Further, both ends of the outer sleeve are sealed with glue.

Further, the first part and the second part axially arranged are formed in the outer sleeve, the incident three-fiber head and the outgoing single-fiber head form the first part, the first lens and the first filter, the second lens and the second The filter sheet forms the second part, and the joints of the first part and the second part are respectively joint planes parallel to each other.

The manufacture method of WDM wavelength division multiplexing module of the present invention, it comprises the following steps:

1) The first filter is fixed to the first lens with glue to form the filter lens assembly at the input end, and the second filter is fixed to the second lens with glue to form the filter lens assembly at the output end, and then UV curing and high temperature baking are performed ;

2) Fix the incident end filter lens assembly and the incident three-fiber head on the adjustment frame respectively;

3) Fix the output end filter lens assembly and the output single fiber head on the adjustment frame respectively;

4) Adjust according to the relevant optical parameters, so that the insertion loss between the incident three-fiber head and the exiting single-fiber head achieves the best coupling. The single optical fiber heads have respectively parallel interface surfaces;

6) Bond the first lens and the incident three-fiber head and the junction surface of the second lens and the outgoing single-fiber head with glue, and then UV-cure;

7) Put on the outer casing, and wrap the two ends of the outer casing with glue to seal, cure and bake.

The present invention adopts the above technical scheme, and by designing the incident optical fiber head of the WDM wavelength division multiplexing module into a three-fiber mode, in cascading to form a wavelength division multiplexing device, the number of optical fibers used can be saved, the cost of laying optical fibers can be saved, the volume is small, and the cost is saved. In addition, the dual filter mode can increase the reflection isolation capability and reduce the signal interference of adjacent channels.

Description of drawings

The present invention will be described in further detail below in conjunction with accompanying drawing and specific embodiment;

Fig. 1 is a schematic diagram of light waves passing wavelengths λ1 and λ2 in an existing WDM wavelength division multiplexing module;

FIG. 2 is a schematic diagram of an existing WDM wavelength division multiplexing module encapsulated by light waves of wavelength λ1/λ2;

FIG. 3 is a schematic diagram of an optical path of a wavelength division module in the prior art;

4 is a schematic diagram of light waves passing through wavelengths λ1 and λ2 in a WDM wavelength division multiplexing module in an embodiment of the present invention;

FIG. 5 is a schematic diagram of encapsulation of light waves of wavelength λ1/λ2 in a WDM wavelength division multiplexing module in an embodiment of the present invention;

Fig. 6 is a schematic diagram of a WDM wavelength division multiplexing module in an embodiment of the present invention.

Implementation

As shown in Figures 4-5, the WDM wavelength division multiplexing module of the present invention includes an outer sleeve 7, one end of the outer sleeve 7 is provided with an incident three-fiber head 5, and the other end of the outer sleeve 7 is provided with an outgoing single-fiber head 6;

A first lens 3, a first filter 1, a second lens 4 and a second filter 2 are arranged between the incident three-fiber head 5 and the outgoing single-fiber head 6, and the first lens 3 is located between the incident three-fiber head 5 and the first Between the filters 1, the second lens 4 is located between the second filter 2 and the outgoing single-fiber head 6;

There are first optical fiber 51, second optical fiber 52 and third optical fiber 53 in the incident three-fiber head 5;

The first filter 1 is a full-wave filter that only transmits the first light wave and the second light wave;

The second filter 2 is a half-wave filter that only transmits the first light wave and reflects light waves of other wavelengths;

After the light enters the first optical fiber 51 of the incident three-fiber head 5, it passes through the first lens 3 and reaches the first filter 1, the first light wave is transmitted through the second filter 2, passes through the second lens 4 and exits the single-fiber head 6 directly The second light wave is transmitted through the first filter 1 and enters the second optical fiber 52 of the three-fiber head 5, while the remaining wavelengths are reflected to the third fiber of the three-fiber head through the first filter 1 and the first lens 3 again. In the optical fiber 53.

The first part and the second part axially arranged are formed in the outer sleeve 7, the incident three-fiber head 5 and the outgoing single-fiber head 6 form the first part, the first lens 3 and the first filter 1 and the second lens 4 and the second filter The sheet 2 forms the second part, and the joints of the first part and the second part are respectively parallel joint planes.

In the application process, the manufacturing method of the above-mentioned WDM wavelength division multiplexing module comprises the following steps:

1) The first filter 1 is fixed to the first lens 3 with glue to form the filter lens assembly at the entrance end, the second filter 2 is fixed to the second lens 4 with glue to form the filter lens assembly at the exit end, and then UV-cured and high temperature baking;

2) Fix the incident end filter lens assembly and the incident three-fiber head 5 on the adjustment frame respectively;

3) Fix the filter lens assembly at the exit end and the exit single fiber head 6 on the adjustment frame respectively;

4) Adjust according to the relevant optical parameters, so that the insertion loss between the incident three-fiber head 5 and the exit single-fiber head 6 achieves the best coupling, where the incident three-fiber head 5, the filter lens assembly at the entrance end and the filter lens at the exit end The assembly and the outgoing single optical fiber head 6 have respectively parallel interface surfaces;

6) Bonding the first lens 3 and the incident three-fiber head 5 and the interface surfaces of the second lens 4 and the outgoing single-fiber head 6 with glue, and then cured by ultraviolet light;

7) Put the outer casing 7 on, and wrap the two ends of the outer casing 7 with glue to seal, cure and bake.

As shown in Figure 6, different single WDM wavelength division multiplexing modules are cascaded according to the module performance requirements to form a wavelength division multiplexer/demultiplexer. It can make the device type wavelength division multiplexer have the following functions:

Make several wavelength signals λ1/λ2/λ3/λ4/λ5/λ6 transmitted by several optical fibers multiplexed into one optical fiber for transmission, reducing the number of optical fibers used;

Conversely, several channels of signals λ1/λ2/λ3/λ4/λ5/λ6 ... transmitted by an optical fiber are separated and transmitted to the demultiplexing function on the corresponding channel respectively.

In order to facilitate cost reduction, preferably, the outer sleeve 7 is a glass tube.

For ease of installation, the first lens 3, the second lens 4, the first filter 1, the first filter 1, and the interface between the lens and the optical fiber head are glued together by glue.

In order to avoid the impact of dust and water vapor on the device, both ends of the outer sleeve 7 are sealed with glue.

The implementation of the present invention is described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific embodiments, and the above-mentioned specific embodiments are illustrative rather than limiting the present invention, and those of ordinary skill in the art should understand that: it can still be Modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention, All of them should fall within the scope of the claims and description of the present invention.

Claims (5)

1. WDM wavelength division multiplexing module, including the outer tube, its characterized in that: one end of the outer sleeve is provided with an incident three-fiber head, and the other end of the outer sleeve is provided with an emergent single-fiber head;

   a first lens, a first filter, a second lens and a second filter are arranged between the incidence three-optical-fiber head and the emergent single-optical-fiber head, the first lens is positioned between the incidence three-optical-fiber head and the first filter, and the second lens is positioned between the second filter and the emergent single-optical-fiber head;

   the incident three-optical-fiber head is internally provided with a first optical fiber, a second optical fiber and a third optical fiber;

   the first filter is a full-wave filter which only transmits the first light wave and the second light wave;

   the second filter plate is a half-wave filter plate which only transmits the first light wave and reflects the light waves with other wavelengths;

   after entering from the first optical fiber of the incident three-optical-fiber head, the light reaches the first filter through the first lens, the first light wave is transmitted through the second filter, and is directly transmitted out through the second lens and the emergent single-optical-fiber head, the second light wave is transmitted out through the first filter to enter the second optical fiber of the incident three-optical-fiber head, and the rest wavelengths are reflected into the third optical fiber of the three-optical-fiber head through the first filter and the first lens again.
2. 2. A WDM wavelength division multiplexing module in accordance with claim 1, wherein: the outer sleeve is a glass tube.
3. 3. A WDM wavelength division multiplexing module in accordance with claim 1, wherein: the two ends of the outer sleeve are sealed by glue.
4. 4. A WDM wavelength division multiplexing module in accordance with claim 1, wherein: the first part and the second part are axially arranged in the outer sleeve, the first part is formed by the incident three-optical fiber head and the emergent single-optical fiber head, the second part is formed by the first lens, the first filter and the second lens, and the second filter, and the junction of the first part and the second part is a junction surface parallel to each other.
5. 5. A method of making a WDM wavelength division multiplexing module in accordance with any one of claims 1-4, wherein: which comprises the following steps:

   1) The first filter plate is fixed on the first lens by glue to form an incident end filter plate lens component, the second filter plate is fixed on the second lens by glue to form an emergent end filter plate lens component, and then ultraviolet curing and high-temperature baking are carried out;

   2) The incidence end filter lens component and the incidence three optical fiber heads are respectively fixed on an adjusting frame;

   3) The outgoing end filter lens component and the outgoing single optical fiber head are respectively fixed on the adjusting frame;

   4) Adjusting according to the related optical parameters to ensure that the insertion loss between the incident three-fiber head and the emergent single-fiber head reaches optimal coupling, wherein the incident three-fiber head, the incident end filter lens component, the emergent end filter lens component and the emergent single-fiber head are respectively provided with mutually parallel connecting surfaces;

   6) Bonding the first lens, the incident three-optical-fiber head, the second lens and the emergent single-optical-fiber head on the joint surface through glue, and then ultraviolet curing;

   7) Sleeving an outer sleeve, wrapping glue on two ends of the outer sleeve, sealing, curing and baking.

Images