Blue light filter film for visible light communication

A technology of visible light communication and blue light, which is applied in optics, optical filters, optical components, etc., can solve the problems of insufficient transmittance of blue light signal band, insufficient accuracy and steepness of blue light boundary, insufficient noise and signal-to-noise ratio, etc., to achieve Suppression of influence of visible light noise, improvement of SNR, effect of improving efficiency and SNR

Active Publication Date: 2014-01-08
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI +1
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Problems solved by technology

[0007] 1) The transmittance of the blue light signal band is not high enough, and there is still room for improvement;
[0008] 2) The out-of-band cut-off is only achieved in the visible band, and the near-infrared band that still has a strong response to the detector has a high transmittance, resulting in in...

Method used

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  • Blue light filter film for visible light communication
  • Blue light filter film for visible light communication
  • Blue light filter film for visible light communication

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Embodiment Construction

[0042] by figure 1 The LED spectrum shown is an example, and the specific design specifications are as follows:

[0043] 1) In the blue light band from 420nm to 478nm, the average transmittance is ≥90%, ensuring that all blue light signals for visible light communication near the central wavelength of 456nm are transmitted and collected by the detector.

[0044] 2) In other visible and near-infrared bands from 500nm to 1100nm, the average transmittance is ≤1%, and all other visible and near-infrared stray light including fluorescence and sunlight excited by LEDs are filtered out to prevent noise interference from entering the detector .

[0045] The low and high refractive index layer materials L and H respectively choose the thin film material SiO 2 (n=1.46) and Ta 2 o 5 (n=2.16), the basic structure of the designed interference cut-off filter is a λ / 4 multilayer film system, and its structure is or Among them, H represents the physical thickness λ / 4n of the high refr...

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Abstract

The invention discloses a blue light filter film for visible light communication, which is structurally characterized in that a wide-pass band interference cutoff filter film, a high reflection film and an antireflection film are arranged on a substrate sequentially. The blue light filter film can greatly reduce noises formed due to a reason that visible illuminating light and background radiation enter a detector. Moreover, since the edge of the blue light filter film for blue light signal penetration and visible illuminating light cutoff is steep and accurate, when the visible illuminating light and near-infrared interference are filtered to an utmost extent, the loss of the blue light signals is minimum, the efficiency and the signal-to-noise ratio of the visible light communication are remarkably improved, and the blue light filter film is very beneficial to the development and the application of fields such as the visible light communication.

Description

technical field [0001] The invention relates to an optical filter film, in particular to a blue light filter film used in visible light communication, which can filter blue light signals for communication from illumination and background light. Background technique [0002] Visible light communication (visible light communication, VLC) is a new optical wireless communication technology developed on the basis of white light LED technology. Compared with traditional radio frequency communication and other optical wireless communications, visible light communication has the advantages of high transmission power, no electromagnetic interference, no bandwidth limitation, and energy saving. It has great development potential and has attracted widespread attention and research. [0003] At present, the light source commonly used in visible light communication is mainly blue LED chip + yellow phosphor to excite white light (spectrum such as figure 1 shown). The blue light LED exci...

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Application Information

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IPC IPC(8): G02B5/20G02B1/11B32B9/00G02B1/115
Inventor 王少伟梁礼晔陆卫陈飞良凌艳菁冀若楠刘星星陈效双俞立明田硕
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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