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Single-fiber bidirectional receiving and sending device based on pentagonal prism and interference filter

A single-fiber two-way transceiver and interference filter technology, which is applied in optical components, coupling of optical waveguides, light guides, etc., can solve problems such as small angle range, different linear expansion coefficients, and affecting system reliability, so as to improve functions, Effect of Polarization Dependent Loss Reduction

Active Publication Date: 2019-07-26
CHINA JILIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The structure: by rationally designing the filter holder and controlling the spatial relative positions of the three filters, as well as adjusting the process, it is ensured that the indicators of the laser and the detector of the product of this structure can meet the requirements, so that the incident light angle can reach 10°~15° °, but since the three pieces of glass are all fixed on the metal bracket, the structure is difficult to change the incident angle, and the range of selectable angles is small; in addition, due to the different linear expansion coefficients of the metal bracket and glass components, they will Bring greater strain, thereby affecting the reliability of the system

Method used

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  • Single-fiber bidirectional receiving and sending device based on pentagonal prism and interference filter
  • Single-fiber bidirectional receiving and sending device based on pentagonal prism and interference filter
  • Single-fiber bidirectional receiving and sending device based on pentagonal prism and interference filter

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Experimental program
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Embodiment 1

[0041] Such as figure 2 As shown, a single-fiber bidirectional transceiver device based on a pentagonal prism and an interference filter, including a metal housing 1 and a laser transmitter 2 fixedly installed on the metal housing 1, an optical fiber assembly 3 and a laser detector 4 , the laser emitter 2 and the fiber optic assembly 3 are arranged horizontally, and the laser detector 4 is arranged perpendicular to the optical path between the laser emitter 2 and the fiber optic assembly 3 .

[0042] A collimating lens 5 , an optical isolator 6 , a pentagonal prism 7 , and a first lens 8 are sequentially arranged on the optical path between the laser transmitter 2 and the fiber assembly 3 . A second lens 9 is arranged between the pentagonal prism 7 and the laser detector 4 . The pentagonal prism 7 is fixedly connected to the metal housing 1 through a metal block, and each lens is placed on a corresponding lens holder and glued and fixed in the metal housing 1 .

[0043] Suc...

Embodiment 2

[0048] A new design scheme is given to further reduce the structural size of the split light path, such as Figure 4 and Figure 5 shown.

[0049] The component composition of the single-fiber bidirectional transceiver of this embodiment is the same as that of Embodiment 1, wherein the shape of the pentagonal prism is designed as follows: the first side I of the pentagonal prism 7 is parallel to the third side III, and is respectively parallel to the second side II is vertical, and the material is glass with a refractive index n=1.5. The angle of incidence α=15° of the incident light through the filter plate 10, the fourth side IV of the pentagonal prism 7 is relative to the first side I inclination angle β=47.5°; the light beams passing through the first lens 8 and the second lens 9 respectively Perpendicular to each other.

[0050] When the single-fiber bidirectional transceiver device provided by this embodiment is used as a receiver, the signal light is received by the ...

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Abstract

The invention discloses a single-fiber bidirectional receiving and sending device based on pentagonal prism and interference filter, belonging to the technical field of optical fiber communication. The single-fiber bidirectional receiving and sending device comprises a laser transmitter, a laser detector, an optical fiber component and the pentagonal prism, wherein the pentagonal prism comprises afirst side face, a second side face and a third side face arranged corresponding to each part above, and a fourth side face used for performing total reflection for a light beam, wherein the first side face is provided with the filter. In the device provided by the invention, the pentagonal prism is added in an optical path, thus, optical path of incident light is changed before entering into thefilter, an incident angle (5-30 degrees) of the incident light is changed, and polarization dependent loss of a system is reduced; meanwhile, an included angle Beta between the first side face I andthe fourth side face IV is designed suitably, thus, the second beam of output light is perpendicular to the incident light, which meets a standard of an optical transceiver. The device provided by theinvention enables each index of such structure product to meet requirements under the premise of guaranteeing size, and improves functions of the transceiver.

Description

technical field [0001] The invention relates to the technical field of optical fiber communication, in particular to a single-fiber bidirectional transceiver based on a pentagonal prism and an interference filter. Background technique [0002] With the advent of the 5G era, the huge amount of data transmission forces passive optical modules to develop in the direction of lower energy consumption and higher efficiency. As a conversion unit for signal transmission, the optical transceiver has high security and stability, and it is indispensable in the construction of an optical network. BIDI optical module is a single-fiber bidirectional optical transceiver module, which uses WDM technology to transmit and receive two central wavelengths in different directions to realize bidirectional transmission of optical signals on one optical fiber. Its structure is mainly divided into optical transmitting module, optical receiving module and wavelength division multiplexing module. ...

Claims

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Application Information

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IPC IPC(8): G02B6/42
CPCG02B6/4214G02B6/4215G02B6/4246
Inventor 余桂英谢钟涛陆舒洁刘若琳金骥徐永明
Owner CHINA JILIANG UNIV
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