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Multichannel wavelength division multiplexer for free space

A wavelength division multiplexer and wavelength division multiplexing technology, which is applied in the direction of instruments, light guides, optics, etc., can solve the problems of low manufacturability, and achieve the effects of simple structure, small device volume and short optical path

Inactive Publication Date: 2018-11-23
华越通信技术(深圳)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Another example is the publication number CN106226868A, which requires the incident angles of the filters of each channel to be very consistent, and this manufacturability is very low

Method used

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  • Multichannel wavelength division multiplexer for free space
  • Multichannel wavelength division multiplexer for free space
  • Multichannel wavelength division multiplexer for free space

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Embodiment Construction

[0021] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. figure 2 It is a schematic diagram of increasing the incidence angle of the small-angle filter in space by a prism, the angle α is the angle between the incident light and the reflected light of the filter 22, and the angle θ is the angle between the incident light and the reflected light of the filter 22 after passing through the prism 21 angle. We can calculate the relationship between angle θ and angle α with simple geometric optics knowledge. As long as the two light-transmitting surfaces of the prism 21 form an included angle, the angle θ>α. That is to say, the prism 21 can enlarge the incident angle of the filter 22 in the external space. The magnification factor is related to the refractive index and wedge angle of the prism 21 .

[0022] The present invention utilizes the principle that the pri...

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Abstract

The invention discloses a multichannel wavelength division multiplexer for a free space, and the wavelength division multiplexer comprises a plurality of wavelength division multiplexing filters, a plurality of collimators, and a plurality of prisms. The collimators, the filters and the prisms form wavelength division multiplexing function units. The wavelength division multiplexing function unitsform the multichannel wavelength division multiplexer. The multichannel wavelength division multiplexer is characterized in that the wavelength division multiplexing filters are smaller in incident angle; the filter coating technology is easier to implement through the amplifying of the incident angles of the prisms, and the cost is lower.

Description

【Technical field】 [0001] The invention relates to a passive device in the field of optical fiber communication, in particular to a free-space, compact multi-port dense wavelength division multiplexer. 【Background technique】 [0002] In wavelength division multiplexing communication, multi-channel and multi-port wavelength division multiplexing devices can be realized by cascading three-port devices. The optical insertion loss of three-port devices mainly comes from the loss of collimator coupling, because it is cascaded, Quite a number of pairs of collimator coupling losses are superimposed, resulting in a large loss. Considering the winding of the optical fiber, it is impossible to realize a compact wavelength division multiplexing device. In order to reduce the optical insertion loss, adopt such as figure 1 The free-space structure shown in the figure realizes the direct cascading of multi-stage filters with large-angle incident filters, avoids multiple couplings from fre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/293
CPCG02B6/2938
Inventor 张钟铁
Owner 华越通信技术(深圳)有限公司
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