MIMO visible light communication system receiving device

Patent metadata

Field	Value
Publication number	US-10128945-B2
Application number	US-201415028097-A
Country	US
Kind code	B2
Filing date	May 29, 2014
Priority date	Oct 8, 2013
Publication date	Nov 13, 2018
Grant date	Nov 13, 2018

Abstract

A receiving device for a multi-input multi-output (MIMO) visible light communication system includes a collimation unit, a metal thin film, a transparent substrate and a receiving unit. The receiving device performs receiving by using optical components, and uses the metal thin film as a main receiving component, which plays a role of filtering and enhanced transmission, and equals to implementing a function of filtering and signal amplification by using electronic components, but overcomes the nonlinear effect of the electronic components, thereby solving the problem of waveform distortion in receiving.

First claim

What is claimed is:

1. A receiving device for a multi-input multi-output (MIMO) visible light communication system, comprising a collimation unit, a metal thin film, a transparent substrate and a receiving unit; wherein,
the collimation unit is configured to: receive incident light, and collimate the incident light, and obtain the collimated light, to make the collimated light output vertically incident to the metal thin film;
the metal thin film is configured to: receive the collimated light, filter the collimated light, obtain the filtered light, and output the filtered light to the transparent substrate;
the transparent substrate is configured to: transmit the filtered light; and
the receiving unit is configured to: receive the light transmitted by the transparent substrate;
wherein plasma frequency of the metal thin film is greater than frequency of the light;
wherein a two-dimensional array of nanopores is distributed on the metal thin film, and a distance between any two points on the nanopore is less than a wavelength of the incident light;
wherein the receiving unit is a two-dimensional charge coupled device (CCD) array or a two-dimensional complementary metal-oxide semiconductor (CMOS) array, each CCD or CMOS pixel corresponds to one nanopore.

2. The receiving device according to claim 1 , wherein, the collimation unit comprises a convergence lens, a field stop and a collimation lens; wherein,
the convergence lens is configured to: receive the incident light, converge the incident light to a focal plane, and obtain the converged light;
the collimation lens is configured to: receive the converged light, and turn the converged light into parallel light; and
the field stop is located between the convergence lens and the collimation lens, and located on the focal plane of the convergence lens, and is configured to: limit a field of view of the incident light, to make the parallel light output as the collimated light vertically incident to the metal thin film.

3. The receiving device according to claim 1 , wherein, shapes of the nanopores are squares, or circles, or triangles.

4. The receiving device according to claim 1 , wherein, the metal thin film comprises N zones, shapes of nanopores in different zones are different, or areas of nanopores in different zones are different, or periods of nanopores in different zones are different.

5. The receiving device according to claim 4 , wherein, in the N zones, shapes of nanopores within a same zone are all identical, areas of nanopores within a same zone are all identical, and periods of nanopores within a same zone are all identical.

6. The receiving device according to claim 1 , wherein, material of the metal thin film is gold, or silver.

7. The receiving device according to claim 1 , wherein, when shapes of the nanopores are squares, and the light is vertically incident, wavelength of a transmission peak of the light is:

λ
max

=

d

i
2

+

j
2

⁢

ɛ
m

⁢

ɛ
d

ɛ
m

+

ɛ
d

wherein, i and j are reciprocal lattice vectors corresponding to different orders, d is a period of two-dimensional array of the nanopores, ε m is a dielectric constant of the metal thin film, and ε d is a dielectric constant of medium in contact with the upper surface of the metal thin film.

8. The receiving device according to claim 1 , wherein, when shapes of the nanopores are triangles, and the light is vertically incident, wavelength of a transmission peak of the light is:

λ
max

=

d

4
3

⁢

i
2

+
ij
+

j
2

⁢

ɛ
m

⁢

ɛ
d

ɛ
m

+

ɛ
d

wherein, i and j are reciprocal lattice vectors corresponding to different orders, d is a period of two-dimensional array of the nanopores, ε m is a dielectric constant of the metal thin film, and ε d is a dielectric constant of medium in contact with the upper surface of the metal thin film.

Assignees

• Zte Corp

Inventors

• Zhi Zhou
• Xu Chao
• Yang Tao
• Yu Zhong
• Wei Wei

Classifications

• H04B10/697

  Arrangements for reducing noise and distortion · CPC title

• G02B5/18

  Diffraction gratings {(holographic optical elements G02B5/32, G03H; integrally combined with optical fibres G02B6/02057; for coupling light guides G02B6/34; integrally combined with optical integrated light guides G02B6/12; grating systems G02B27/44)} · CPC title

• G01N21/25

  Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands · CPC title

• G02B27/0025

  for optical correction, e.g. distorsion, aberration · CPC title

• H04B10/116 Primary

  Visible light communication · CPC title