Wireless infrared data links

Ray-trace simulations of diffuse channels and demonstration of diffractive element for multibeam transmitters

Mikko Karppinen, Kari Kataja, Jukka-Tapani Mäkinen, Sanna Juuso, Hannu Rajaniemi, P. Paakkonen, J. Turunen, Juha Rantala, Pentti Karioja

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)

Abstract

Free-space IR transmission provides high bandwidth and good security with small-sized and low-cost links, for instance, for high-bit-rate wireless LANs. Some robustness against shadowing is achieved using diffuse channels, but disadvantages are high path loss and multipath propagation. We use ray-trace simulation software to analyze IR channels in realistic office rooms. Simulations are performed to test the methods and to specify the bandwidth and power budget requirements of diffuse links. Both diffuse and specular reflections as well as shadowing effects due to furniture are considered. Based on the study, novel Monte Carlo ray-tracing software, such as ASAP (Advanced System Analyses Program), are suitable for analyzing the multipath dispersion and the optical power budget of infrared links in realistic indoor environments. The simulations also reveal the benefits of quasidiffuse link configurations, which are composed of multibeam transmitters with restricted beam divergences as well as of detectors with narrow fields of view. For implementation of multibeam transmitters we design an array-type diffractive element that modifies the beams of a 2-D vertical-cavity surface- emitting laser (VCSEL) array. A single element providing the largest 50-deg illumination angle is fabricated for demonstration. The measured diffraction efficiency is in fair agreement with the calculated one after considering the properties of the real VCSEL beam.
Original languageEnglish
Pages (from-to)899-910
JournalOptical Engineering
Volume41
Issue number4
DOIs
Publication statusPublished - 2002
MoE publication typeA1 Journal article-refereed

Fingerprint

data links
transmitters
Telecommunication links
Transmitters
rays
Demonstrations
Surface emitting lasers
Infrared radiation
surface emitting lasers
budgets
Bandwidth
Infrared transmission
Diffraction efficiency
simulation
Multipath propagation
Ray tracing
bandwidth
computer programs
Local area networks
cavities

Keywords

  • optical links
  • wireless LAN
  • WLAN
  • Monte Carlo
  • Monte Carlo method
  • ray tracing
  • surface emitting lasers
  • semiconductor laser arrays
  • multipath channels

Cite this

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title = "Wireless infrared data links: Ray-trace simulations of diffuse channels and demonstration of diffractive element for multibeam transmitters",
abstract = "Free-space IR transmission provides high bandwidth and good security with small-sized and low-cost links, for instance, for high-bit-rate wireless LANs. Some robustness against shadowing is achieved using diffuse channels, but disadvantages are high path loss and multipath propagation. We use ray-trace simulation software to analyze IR channels in realistic office rooms. Simulations are performed to test the methods and to specify the bandwidth and power budget requirements of diffuse links. Both diffuse and specular reflections as well as shadowing effects due to furniture are considered. Based on the study, novel Monte Carlo ray-tracing software, such as ASAP (Advanced System Analyses Program), are suitable for analyzing the multipath dispersion and the optical power budget of infrared links in realistic indoor environments. The simulations also reveal the benefits of quasidiffuse link configurations, which are composed of multibeam transmitters with restricted beam divergences as well as of detectors with narrow fields of view. For implementation of multibeam transmitters we design an array-type diffractive element that modifies the beams of a 2-D vertical-cavity surface- emitting laser (VCSEL) array. A single element providing the largest 50-deg illumination angle is fabricated for demonstration. The measured diffraction efficiency is in fair agreement with the calculated one after considering the properties of the real VCSEL beam.",
keywords = "optical links, wireless LAN, WLAN, Monte Carlo, Monte Carlo method, ray tracing, surface emitting lasers, semiconductor laser arrays, multipath channels",
author = "Mikko Karppinen and Kari Kataja and Jukka-Tapani M{\"a}kinen and Sanna Juuso and Hannu Rajaniemi and P. Paakkonen and J. Turunen and Juha Rantala and Pentti Karioja",
year = "2002",
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language = "English",
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pages = "899--910",
journal = "Optical Engineering",
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}

Wireless infrared data links : Ray-trace simulations of diffuse channels and demonstration of diffractive element for multibeam transmitters. / Karppinen, Mikko; Kataja, Kari; Mäkinen, Jukka-Tapani; Juuso, Sanna; Rajaniemi, Hannu; Paakkonen, P.; Turunen, J.; Rantala, Juha; Karioja, Pentti.

In: Optical Engineering, Vol. 41, No. 4, 2002, p. 899-910.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Wireless infrared data links

T2 - Ray-trace simulations of diffuse channels and demonstration of diffractive element for multibeam transmitters

AU - Karppinen, Mikko

AU - Kataja, Kari

AU - Mäkinen, Jukka-Tapani

AU - Juuso, Sanna

AU - Rajaniemi, Hannu

AU - Paakkonen, P.

AU - Turunen, J.

AU - Rantala, Juha

AU - Karioja, Pentti

PY - 2002

Y1 - 2002

N2 - Free-space IR transmission provides high bandwidth and good security with small-sized and low-cost links, for instance, for high-bit-rate wireless LANs. Some robustness against shadowing is achieved using diffuse channels, but disadvantages are high path loss and multipath propagation. We use ray-trace simulation software to analyze IR channels in realistic office rooms. Simulations are performed to test the methods and to specify the bandwidth and power budget requirements of diffuse links. Both diffuse and specular reflections as well as shadowing effects due to furniture are considered. Based on the study, novel Monte Carlo ray-tracing software, such as ASAP (Advanced System Analyses Program), are suitable for analyzing the multipath dispersion and the optical power budget of infrared links in realistic indoor environments. The simulations also reveal the benefits of quasidiffuse link configurations, which are composed of multibeam transmitters with restricted beam divergences as well as of detectors with narrow fields of view. For implementation of multibeam transmitters we design an array-type diffractive element that modifies the beams of a 2-D vertical-cavity surface- emitting laser (VCSEL) array. A single element providing the largest 50-deg illumination angle is fabricated for demonstration. The measured diffraction efficiency is in fair agreement with the calculated one after considering the properties of the real VCSEL beam.

AB - Free-space IR transmission provides high bandwidth and good security with small-sized and low-cost links, for instance, for high-bit-rate wireless LANs. Some robustness against shadowing is achieved using diffuse channels, but disadvantages are high path loss and multipath propagation. We use ray-trace simulation software to analyze IR channels in realistic office rooms. Simulations are performed to test the methods and to specify the bandwidth and power budget requirements of diffuse links. Both diffuse and specular reflections as well as shadowing effects due to furniture are considered. Based on the study, novel Monte Carlo ray-tracing software, such as ASAP (Advanced System Analyses Program), are suitable for analyzing the multipath dispersion and the optical power budget of infrared links in realistic indoor environments. The simulations also reveal the benefits of quasidiffuse link configurations, which are composed of multibeam transmitters with restricted beam divergences as well as of detectors with narrow fields of view. For implementation of multibeam transmitters we design an array-type diffractive element that modifies the beams of a 2-D vertical-cavity surface- emitting laser (VCSEL) array. A single element providing the largest 50-deg illumination angle is fabricated for demonstration. The measured diffraction efficiency is in fair agreement with the calculated one after considering the properties of the real VCSEL beam.

KW - optical links

KW - wireless LAN

KW - WLAN

KW - Monte Carlo

KW - Monte Carlo method

KW - ray tracing

KW - surface emitting lasers

KW - semiconductor laser arrays

KW - multipath channels

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DO - 10.1117/1.1456538

M3 - Article

VL - 41

SP - 899

EP - 910

JO - Optical Engineering

JF - Optical Engineering

SN - 0091-3286

IS - 4

ER -