CN213210537U

CN213210537U - Small passive optical device

Info

Publication number: CN213210537U
Application number: CN202021628745.XU
Authority: CN
Inventors: 陆凯; 朱健
Original assignee: SHANGHAI CHINA SCIENCE FIBEROPTIC COMPONENTS CO Ltd; Shanghai China Sciences Co ltd; Shanghai Zhongke Chuangxin Communication Equipment Co ltd
Current assignee: SHANGHAI CHINA SCIENCE FIBEROPTIC COMPONENTS CO Ltd; Shanghai China Sciences Co ltd; Shanghai Zhongke Chuangxin Communication Equipment Co ltd
Priority date: 2020-08-07
Filing date: 2020-08-07
Publication date: 2021-05-14
Anticipated expiration: 2030-08-07

Abstract

The utility model discloses a small-size passive optical device, this passive optical device include coaxial arrangement's first lens and second lens, the terminal surface before first lens and the looks proximal surface of second lens are, the WDM membrane has been plated to the preceding terminal surface of first lens, the AR membrane has been plated to the preceding terminal surface of second lens, first lens and second lens are self-focusing lens and the focus all sets up in preceding terminal surface, the rear end face of first lens and second lens is the inclined plane. The device overcomes the defects of the traditional film filter type WDM device, has good flatness, is insensitive to temperature and polarization change, simplifies the packaging process, saves materials and labor and reduces the manufacturing cost.

Description

Small passive optical device

Technical Field

The utility model relates to an optical communication technical field especially relates to a small-size passive optical device.

Background

Passive optical devices (WDM) are mainly optical fiber connectors, optical power splitters, optical directional couplers, wavelength division multiplexers, and optical isolators, from the viewpoint of their functions. At present, a WDM device is a thin film filter type WDM device.

The thin film filter type WDM device generally combines a plurality of layers of dielectric thin films of different materials, refractive indexes and thicknesses according to design requirements, and achieves the effect of synthesizing and separating different wavelengths by forming pass bands and blocking bands for different wavelengths. The device has the advantages of compact structure, almost independence on optical fiber parameters, very flat signal pass band and low insertion loss which can reach 0.4 dB. The defects are that a plurality of glass tubes are used as structural members for bridging and fixing, and glue is needed for fixing among all parts. The whole device needs to be completed by consuming a large amount of materials, auxiliary materials and manpower, and the packaging cost is high.

Disclosure of Invention

The utility model aims to solve the technical problem that a small-size passive optical device is provided, the defect of traditional film filter type WDM device is overcome to this device, and its flatness is good, and is insensitive to temperature and polarization change, and simplifies packaging technology, save material and manual work, reduction in manufacturing cost.

In order to solve the technical problem, the utility model discloses small-size passive optical device includes first lens and the second lens of coaxial arrangement, the terminal surface before first lens and the looks proximal surface of second lens are, the WDM membrane has been plated to the preceding terminal surface of first lens, the AR membrane has been plated to the preceding terminal surface of second lens, first lens and second lens are self-focusing lens and the focus all sets up in preceding terminal surface, the rear end face of first lens and second lens is the inclined plane.

Further, the inclined plane angles of the rear end faces of the first lens and the second lens are 8 degrees.

Furthermore, the rear end face of the first lens is provided with a double-optical tail fiber through a first optical fiber capillary, and the rear end face of the second lens is provided with a single-optical tail fiber through a second optical fiber capillary.

Furthermore, the first lens and the second lens, the first lens and the double-optical tail fiber and the second lens and the single-optical tail fiber are fixed in a side encapsulation mode.

Because the utility model discloses small-size passive optical device has adopted above-mentioned technical scheme, this passive optical device includes coaxial first lens and the second lens of arranging promptly, the looks proximal surface of first lens and second lens is preceding terminal surface, the WDM membrane has been plated to the preceding terminal surface of first lens, the AR membrane has been plated to the preceding terminal surface of second lens, first lens and second lens are self-focusing lens and the focus all sets up in preceding terminal surface, the rear end face of first lens and second lens is the inclined plane. The device overcomes the defects of the traditional film filter type WDM device, has good flatness, is insensitive to temperature and polarization change, simplifies the packaging process, saves materials and labor and reduces the manufacturing cost.

Drawings

The invention will be described in further detail with reference to the following drawings and embodiments:

fig. 1 is a schematic structural diagram of a small passive optical device of the present invention;

fig. 2 is a schematic diagram of the optical path of the miniature passive optical device.

Detailed Description

Embodiment as shown in fig. 1, the small passive optical device of the present invention includes a first lens 1 and a second lens 2 coaxially disposed, the adjacent surfaces of the first lens 1 and the second lens 2 are

front end surfaces

11 and 21, the front end surface 11 of the first lens 1 is plated with a WDM film, the front end surface 21 of the second lens 2 is plated with an AR film, the first lens 1 and the second lens 2 are self-focusing lenses and the focal point is set on the

front end surfaces

11 and 21, and the

rear end surfaces

12 and 22 of the first lens 1 and the second lens 2 are inclined surfaces.

Preferably, the bevel angles of the

rear end surfaces

12 and 22 of the first lens 1 and the second lens 2 are 8 degrees.

Preferably, the rear end face 12 of the first lens 1 is provided with a double optical tail fiber 3 through a first optical fiber capillary 5, and the rear end face 22 of the second lens 2 is provided with a single optical tail fiber 4 through a second optical fiber capillary 6.

Preferably, the first lens 1 and the second lens 2, the first lens 1 and the first fiber capillary 5, and the second lens 2 and the second fiber capillary 6 are fixed in a side encapsulation manner.

The small passive optical device is characterized in that the WDM film is plated on the front end face of the first lens 1, in the implementation process, the reflection insertion loss can be adjusted to the minimum by using the double-optical tail fiber 3 and the first lens 1, and the double-optical tail fiber 3 and the first lens 1 are fixed in a side encapsulation mode.

After the reflection insertion loss debugging is finished, the first lens 1 and the second lens 2 are assembled and fixed, the first lens 1 and the second lens 2 are ensured to be coaxial in the assembling process, and the fixing is realized in a side surface encapsulation mode. The distance between the first lens 1 and the second lens 2 is controlled to ensure that glue encapsulated on the side surface cannot penetrate between the two lenses.

And after the first lens 1 and the second lens 2 are fixed, debugging of a transmission end is carried out. The transmission end receives light by the single optical tail fiber 4, the transmission insertion loss is adjusted to be minimum, and the second lens 2 and the single optical tail fiber 4 are fixed in a side encapsulation mode.

As shown in fig. 2, the first lens 1 and the second lens 2 are each a self-focusing lens with a pitch Z =0.25P, and the two lenses are coaxially assembled and can be equivalent to a self-focusing lens with a pitch Z = 0.5P. For the reflection end, when a beam of divergent light is input from the first optical fiber at the left end face of the first lens 1, the light passes through the converging action of the first lens 1, is parallel light on the right end face, passes through the first lens 1 again after being reflected by the WDM film, is converged to the left end face, becomes convergent light, and is received by the second optical fiber. For the transmission end, the diverging light beam input from the first optical fiber passes through two self-focusing lenses with the equivalent pitch Z =0.5P, is converged on the right end face of the second lens 2, and is received by the third optical fiber, so that the light combining and separating effects are realized.

The small passive optical device has small volume, no bridging glass tube and low cost.

Claims

1. A miniature passive optical device, characterized by: the passive optical device comprises a first lens and a second lens which are coaxially arranged, wherein the adjacent surfaces of the first lens and the second lens are front end surfaces, the front end surface of the first lens is plated with a WDM film, the front end surface of the second lens is plated with an AR film, the first lens and the second lens are self-focusing lenses, the focuses of the first lens and the second lens are arranged on the front end surfaces, and the rear end surfaces of the first lens and the second lens are inclined surfaces.

2. A miniature passive optical device as claimed in claim 1, wherein: the inclined plane angle of the rear end faces of the first lens and the second lens is 8 degrees.

3. A miniature passive optical device according to claim 1 or 2, wherein: the rear end face of the first lens is provided with a double-optical tail fiber through a first optical fiber capillary, and the rear end face of the second lens is provided with a single-optical tail fiber through a second optical fiber capillary.

4. A miniature passive optical device as claimed in claim 3, wherein: and the first lens and the second lens, the first lens and the double-optical tail fiber and the second lens and the single-optical tail fiber are fixed in a side encapsulation mode.