CN211402823U

CN211402823U - Dense wavelength division multiplexing and demultiplexing device with free space structure

Info

Publication number: CN211402823U
Application number: CN202020113108.2U
Authority: CN
Inventors: 康秀杰
Original assignee: Shanghai Shengguang Photoelectric Science & Technology Co ltd
Current assignee: Shanghai Shengguang Photoelectric Science & Technology Co ltd
Priority date: 2020-01-19
Filing date: 2020-01-19
Publication date: 2020-09-01
Anticipated expiration: 2030-01-19

Abstract

The utility model relates to a dense wavelength division multiplexing and demultiplexing ware of free space structure belongs to the optical fiber communication equipment field. The utility model provides a compact structure, with low costs, small, be suitable for batch production, can realize multiplexing and demultiplexing's a dense wavelength division multiplexing and demultiplexing ware of free space structure simultaneously. The utility model comprises a glass substrate, N optical fiber collimators, N-1 optical filters, N lenses and a prism which are arranged on the glass substrate in rows in turn, wherein the first optical fiber collimator is the input end of a wavelength division demultiplexer/the output end of the wavelength division multiplexer, and other optical fiber collimators are the output end of the wavelength division demultiplexer/the input end of the wavelength division multiplexer; no optical filter is arranged between the first optical fiber collimator and the lens, and the included angle between the incident light and the emergent light is 3.6-4.4 degrees.

Description

Dense wavelength division multiplexing and demultiplexing device with free space structure

Technical Field

The utility model relates to a dense wavelength division multiplexing and demultiplexing ware of free space structure belongs to the optical fiber communication equipment field.

Background

The wavelength division multiplexing technology is a technology for increasing transmission capacity in a same optical fiber by times, and is realized by a multiplexer and a demultiplexer. Wavelength division multiplexing can effectively increase bandwidth capacity in optical networks. With the development of optical network technology, the requirements on the wavelength division multiplexer are increasingly higher, not only the requirements on insertion loss are lower and lower, but also the requirements on the package size are smaller and smaller, and the required application environment range is worse and worse. The traditional separately packaged three-port wavelength division multiplexing device comprises a filter plate, a collimator, a self-focusing lens and a double-fiber pigtail, and is packaged by a packaging sleeve. A conventional demultiplexer module is constructed from such several individual devices of different wavelengths that are cascaded together. However, such cascaded modules have inherent disadvantages, such as large insertion loss, large package size, and large temperature-dependent performance parameters. The free space wavelength division multiplexer emerging in recent years overcomes the defects, and requires the use of a large-angle filter, the larger the incident angle is, the smaller the module packaging size can be, but the filter of the large-angle coarse wavelength division multiplexer is easy to realize by the current technology; although the current market is feasible in theory with a large amount of dense wavelength division multiplexers (200G/100G/50G), the cost is high and the method is not suitable for mass production.

Disclosure of Invention

The utility model discloses to above-mentioned problem, provide a compact structure, with low costs, small, be suitable for batch production, can realize multiplexing and demultiplexing the dense wavelength division multiplexing and demultiplexing ware of a free space structure of function simultaneously.

In order to achieve the above object, the present invention adopts the following scheme, a dense wavelength division multiplexing and demultiplexing device with a free space structure, comprising a glass substrate, N optical fiber collimators, an N-1 optical filter, N lenses and a prism, which are sequentially arranged in rows on the glass substrate, wherein the first optical fiber collimator is the input end of the wavelength division demultiplexer/the output end of the wavelength division multiplexer, and the other optical fiber collimators are the output end of the wavelength division demultiplexer/the input end of the wavelength division multiplexer; no optical filter is arranged between the first optical fiber collimator and the lens, and the included angle between the incident light and the emergent light is 3.6-4.4 degrees.

The filter is an ITU standard channel small-angle filter, and the incident angle is 1.8-2.2 degrees.

Each filter has a different transmission wavelength, and the transmission wavelength is an ITU standard wavelength.

The reflection surface of the prism is uniformly distributed with 92 +/-0.2 degrees of concave wedge angles, and the surface of each wedge angle is plated with a high-reflection film.

The beneficial effects of the utility model

The utility model solves the technical problems that the free space technical module needs long optical distance and large module size by adopting prism reflection and the small angle filter plate, and meets the requirement of customers on module miniaturization; all optical elements are arranged on the glass substrate, so that the module parameters are less influenced by temperature, the industrial-grade environmental requirements can be met, and the insertion loss is superior to that of the traditional wavelength division multiplexer module.

Drawings

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

Detailed Description

The utility model comprises a glass substrate 2, N optical fiber collimators 5, N-1 optical filters 4, N lenses 3 and a prism 1 which are arranged on the glass substrate 2 in rows in turn, wherein the first optical fiber collimator 51 is the input end of a wavelength division demultiplexer/the output end of the wavelength division multiplexer, and other optical fiber collimators are the output end of the wavelength division demultiplexer/the input end of the wavelength division multiplexer; the optical filter 4 is not arranged between the first optical fiber collimator 51 and the lens 3, incident light rays are reflected twice or more than twice by the prism 1 and then are emitted from the output end, and the included angle between the incident light rays and the emergent light rays is 3.6-4.4 degrees. The optical filter is a 4ITU standard channel small-angle optical filter, the incident angle of the optical filter is 1.8-2.2 degrees, each optical filter has different transmission wavelengths, and the transmission wavelength is the ITU standard wavelength. Concave wedge angles of 92 +/-0.2 degrees are uniformly distributed on the reflecting surface of the prism 1, and the surfaces of the wedge angles are plated with high-reflection films. The first optical fiber collimator 51 and the rest of the optical fiber collimators are respectively arranged in two directions in an inclined manner, and the specific inclined angle can be determined by enabling the insertion loss of each input and output of the wavelength division multiplexer to be less than 1.5 dB. The present invention is described in detail with reference to the accompanying drawings and examples as follows:

example 1

When the optical fiber demultiplexer is used as a wave demultiplexer, as shown in fig. 1, the optical fiber of the first optical collimator 51 is used as an input end, and the optical fibers of other optical collimators are used as output ends; the light beam is input through the optical fiber of the first fiber collimator 51 and entersThe first lens is focused on the prism 1 after passing through the first lens, the first lens is incident on the second lens after being reflected twice on the prism 1, the first lens is changed into parallel light after passing through the second lens, and the parallel light is incident on the first optical filter, wherein the transmission wavelength of the first optical filter is lambda₁The light is output through a second optical fiber collimator; meanwhile, the first optical filter also reflects light with other wavelengths to a third lens, the light is incident on the prism 1 through the third lens, and the like, and lambda is output from the optical fibers from the third fiber collimator to the ninth fiber collimator respectively₂~λ₈In this way, lambda is achieved₁~λ₈Demultiplexing application of eight paths of light.

Example 2

The utility model discloses a when wavelength division multiplexer uses, as shown in FIG. 1, the optic fibre of first fiber collimator 51 is as the output, and the optic fibre of other fiber collimator is as the input, inputs lambda from the input respectively₁~λ₈The light with eight wavelengths is output from the first optical collimator 51 through the optical filter 4, the lens 3, the prism 1 and the like, and the multiplexing of eight wavelengths from lambda 1 to lambda 8 can be realized.

Claims

1. A dense wavelength division multiplexing and demultiplexing device with a free space structure is characterized by comprising a glass substrate, N optical fiber collimators, an N-1 optical filter, N lenses and a prism, wherein the N optical fiber collimators, the N optical filter, the N lenses and the prism are sequentially arranged on the glass substrate in a row; no optical filter is arranged between the first optical fiber collimator and the lens, and the included angle between the incident light and the emergent light is 3.6-4.4 degrees.

2. The DWDM and demultiplexer of free space architecture as claimed in claim 1 wherein the filter is a low angle filter with an incident angle of 1.8-2.2 degrees.

3. A free-space structured dwdm and demux as set forth in claim 2 in which the filters have different transmission wavelengths.

4. The DWDM and demultiplexer of a free space structure as claimed in claim 1, wherein the reflecting surface of the prism is uniformly distributed with 92 ± 0.2 degree concave wedge angles, and the surface of the wedge angle is plated with high reflection film.