July 2008 doc.: IEEE 802.15- Project: IEEE ... · July 2008 Slide 1 Dong Jae Shin et al., Samsung...
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July 2008 Dong Jae Shin et al., Samsung Slide 1 doc.: IEEE 802.15- <08/0468-00 > SG-VLC Project: IEEE P802.15 Working Group for Wireless Personal Area N Project: IEEE P802.15 Working Group for Wireless Personal Area N etworks ( etworks ( WPANs WPANs ) ) Submission Title: [VLC wavelength range] Date Submitted: [14 July, 2008] Source: [Dong Jae Shin, D.K. Jung, Y.J. Oh, Taehan Bae, Hyuk-Choon Kwon, Jaeseung Son ] Company [Samsung Electronics Co.,LTD] Address [Dong Suwon P.O. Box 105, 416 Maetan-3dong, Yeongtong-gu, Suwon-si, Gyeonggi-do, 443-742 Korea] Voice:[82-31-279-7293], FAX: [82-31-279-5130], E-Mail:[[email protected]] Re: [] Abstract: [The wavelength range of visible light communication is discussed. Considerations on VLC wavelength range are extracted from the VLC systems demonstrated so far. They include LED infrastructure, visibility, modulation limit, up/down separation, WDM.] Purpose: [Contribution to IEEE 802.15 SG-VLC] Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15.
Transcript of July 2008 doc.: IEEE 802.15- Project: IEEE ... · July 2008 Slide 1 Dong Jae Shin et al., Samsung...
July 2008
Dong Jae Shin et al., SamsungSlide 1
doc.: IEEE 802.15- <08/0468-00 >
SG-VLC
Project: IEEE P802.15 Working Group for Wireless Personal Area NProject: IEEE P802.15 Working Group for Wireless Personal Area Networks (etworks (WPANsWPANs))
Submission Title: [VLC wavelength range]Date Submitted: [14 July, 2008]Source: [Dong Jae Shin, D.K. Jung, Y.J. Oh, Taehan Bae, Hyuk-Choon Kwon, Jaeseung Son ] Company [Samsung Electronics Co.,LTD]Address [Dong Suwon P.O. Box 105, 416 Maetan-3dong, Yeongtong-gu, Suwon-si, Gyeonggi-do, 443-742 Korea]Voice:[82-31-279-7293], FAX: [82-31-279-5130], E-Mail:[[email protected]]Re: []
Abstract: [The wavelength range of visible light communication is discussed. Considerations on VLC wavelength range are extracted from the VLC systems demonstrated so far. They include LED infrastructure, visibility, modulation limit, up/down separation, WDM.] Purpose: [Contribution to IEEE 802.15 SG-VLC]Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15.
July 2008
Dong Jae Shin et al., SamsungSlide 2
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Samsung Electronics
2008. 07
VLC wavelength range
July 2008
Dong Jae Shin et al., SamsungSlide 3
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Why do we discuss on VLC wavelength range?
Wavelength range reference
Illumination industry
IrDA
Considerations on VLC wavelength range
Wavelength ranges in VLC demo systems
Technical considerations
Other considerations
Summary
Outline
July 2008
Dong Jae Shin et al., SamsungSlide 4
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Why do we discuss on VLC wavelength range?
• VLC R&D
– Unregulated range over 300 THz
– Unknown communication characteristics of visible devices
• VLC standardization
– Coexistence/Interoperability with Infrared
– Consensus on VLC Identity
– IEEE802.15 VLC PAR
July 2008
Dong Jae Shin et al., SamsungSlide 5
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Illumination industry standard
• CIE (Commission Internationale de I`Eclairage)– Illumination wavelength range : 380 ~ 780 nm
Source : www.lightemittingdiodes.org
CIE 1978 V(λ) function
July 2008
Dong Jae Shin et al., SamsungSlide 6
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IrDA standard
• Standard : 850 ~ 900 nm
• Product (Vishay TFDU6301)– Peak wavelength : 875 ~ 900 nm
– Spectral bandwidth : 45 nm
Wavelength (nm)
Transmittance (%)
July 2008
Dong Jae Shin et al., SamsungSlide 7
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Wavelength ranges in VLC demo systems
Traffic infraWDMUp/down separation
Modulation limit
Consideration
R/Y/GR/G/BR/G/B (down)
Ir (up)
Wavelength
NavigationAudio broadcastLANApplication
VLCCVLCCVLCCOrganization
July 2008
Dong Jae Shin et al., SamsungSlide 8
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SG-VLC
Wavelength ranges in VLC demo systems
LED infraWDMLED infraConsideration
WhiteR/G/BWhiteWavelength
Optical IDData broadcastAudio broadcastApplication
VLCCKoptiOxford U.Organization
July 2008
Dong Jae Shin et al., SamsungSlide 9
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SG-VLC
Wavelength ranges in VLC demo systems
LED infra
Visibility
WDM
Sign board infra
Visibility
Modulation limit
Consideration
White (down)
Red (up)
R/G/BRedWavelength
LANData broadcastP2PApplication
SamsungSamsungSamsungOrganization
July 2008
Dong Jae Shin et al., SamsungSlide 10
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Considerations on VLC wavelength range
• LED infrastructure
• Visibility
• Modulation limit
• WDM
• Up/down separation
• Coexistence/interoperability with Infrared
• Photodiode
• Link
July 2008
Dong Jae Shin et al., SamsungSlide 11
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LED infrastructure – LED efficiency
300 400 500 600 7001E-3
0.01
0.1
1
10
100
AlGaInP
Tj=25 oC
NonpolarLED
Ext
erna
l Qua
ntum
Effi
cien
cy (%
)
Peak Wavelength (nm)
AlGaInN
Green gap
By courtesy of SEM
July 2008
Dong Jae Shin et al., SamsungSlide 12
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LED infrastructure – Illumination LED spectrum
0
0.2
0.4
0.6
0.8
1
1.2
380 480 580 680 780
SEMCO
Lumiled
Nichia
Osram
~130 ns
~25 ns
Measured impulse response
Blue filtering
0 10 20 30 40 50-25
-20
-15
-10
-5
0
freq (MHz)
Rela
tive resp
onse (
dB
)
White response
Blue response
Measured LED small-signal bandwidth
White response
Blue response
July 2008
Dong Jae Shin et al., SamsungSlide 13
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Visibility
What You See Is What You Send (WYSIWYS)
July 2008
Dong Jae Shin et al., SamsungSlide 14
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Modulation limit
Wavelength
Modulation
~ 10M
> 100MPhosphorless
LED
RCLED
LD< 1G
> 500M
PhosphorLED
July 2008
Dong Jae Shin et al., SamsungSlide 15
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WDM
0
1
2
3
4
5
300 400 500 600 700 800
0
20
40
60
80
100
Tran
smitt
ance
(%)
Wavelength (nm)
Blue : 470 nm(peak), 30 nm(3dB BW)
Green : 520 nm(peak), 37 nm(3dB BW)
Red : 630 nm(peak), 17 nm(3dB BW)
LED : 3 ~ 4 channel
RCLED : 30 ~ 40 channel
July 2008
Dong Jae Shin et al., SamsungSlide 16
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Up/down separation
Ir
Visible bandInfrared band
Visible broadbandVisible narrowband
July 2008
Dong Jae Shin et al., SamsungSlide 17
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Coexistence/Interoperability with IrDA
Interoperability with infra
Interoperability with mobile
Coexistence with IrDA
July 2008
Dong Jae Shin et al., SamsungSlide 18
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Silicon PD spectral response
~4 dB Responsivity variation from Blue to Red Silicon PD variants(www.hamamatsu.com)
July 2008
Dong Jae Shin et al., SamsungSlide 19
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VLC linkOptical Spectrum
RF Spectrum
[SUN] [Fluorescent]
July 2008
Dong Jae Shin et al., SamsungSlide 20
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SUMMARY
• Technical considerations on VLC wavelength range– LED Infra
– Visibility
– Modulation limit
– WDM
– Up/down separation
• Standardization issue– Consensus on VLC wavelength range
– Common range or ranges for applications
– WDM channel
– Coexistence / Interoperability with IrDA
