A method for reducing crosstalk of reflected light by an optical device
A technology of reflecting light and optical devices, which is applied in the field of optical communication and can solve the problems of rising cost of laser components
Active Publication Date: 2021-07-30
JIANGSU ALLRAY
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Problems solved by technology
Since the transmission of optical signals will form a certain reflection at each interface, and the reflected light will cause crosstalk to the light source, so during long-distance transmission, an isolator will be added to the front end of the laser to reduce the crosstalk caused by the reflected light to the laser, but the isolator The increase has also led to an increase in the cost of laser components
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[0017] see figure 1 , a method for reducing reflected light crosstalk by an optical device, comprising the following steps:
[0018] (1) Select the corresponding filter 3 film system according to the wavelength that needs to be transmitted. Generally, the conventional filter 3 film system is divided into high transmission band and high reflection band. The outside is a high reflection zone. The filter 3 forms an installation angle of 45° with the emitted light 101 .
[0019] (2) Select the ceramic ferrule 4 with optical fiber, the end face grinding angle α of the ceramic ferrule is greater than or equal to 8°, and the direction of the grinding angle α of the ceramic ferrule is consistent with the inclination direction of the 45° optical filter 3 during installation.
[0020] (3) Taking a ceramic ferrule with a grinding angle α of 8° as an example, the lens is located between the laser and the optical filter, and the emitted light 101 emitted by the laser 1 is converged by th...
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The invention relates to a method for reducing the crosstalk of reflected light by an optical device. According to the wavelength to be transmitted, the corresponding optical filter film system is selected, and the optical filter and the emitted light form a 45° installation angle; ceramic ferrules with optical fibers, ceramic The end face grinding angle of the ferrule is greater than or equal to 8°, and the grinding angle direction of the ceramic ferrule is consistent with the inclination direction of the 45° filter during installation; the emitted light from the laser is converged by the lens and then passes through the filter, and enters the band The ceramic ferrule with the grinding angle α is transmitted in the optical fiber, the reflected light is transmitted from the optical fiber to the air, and the reflected light and the emitted light will form an angle of 3.7°; a film system offset of about 26nm is formed, and the transmission band range exceeds 20nm. Reach the reflection band, so that the reflected light cannot pass through the filter and form crosstalk to the laser. The invention forms an effective anti-reflection mechanism in an optical communication device through basic optical principles, has a simple structure, does not need to use an isolator, and reduces product cost.
Description
technical field [0001] The invention relates to the field of optical communication, in particular to a method for reducing crosstalk of reflected light by an optical device. Background technique [0002] With its advantages of high speed, large capacity, anti-interference, low energy consumption and strong confidentiality, photoelectric communication technology has been widely used in the fields of sensing detection, communication transmission, data storage, biomedicine, aerospace and other fields. It is an important supporting technology for the construction of modernization and national defense industry. Since the transmission of optical signals will form a certain reflection at each interface, and the reflected light will cause crosstalk to the light source, so during long-distance transmission, an isolator will be added to the front end of the laser to reduce the crosstalk caused by the reflected light to the laser, but the isolator The increase has also led to an incre...
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IPC IPC(8): G02B6/42
CPCG02B6/4206G02B6/4207G02B6/4215
Inventor 薛京谷许奔波陈岭闫明雪
Owner JIANGSU ALLRAY