TY - JOUR
T1 - Holographic Diffusers for Indoor Infrared Communication Systems
AU - Pakravan, M. R.
AU - Simova, E.
AU - Kavehrad, M.
N1 - Funding Information:
1Department of Electrical Engineering, University of Ottawa, Ottawa, Ontario, Canada, K1N 6N5; e-mail: pakravan@elg.uott awa.ca. 2National Research Council of Canada, INMS, Ottawa, Canada, K1A 0S2; e-mail: eli.simova@nrc.ca . 3Department of Electrical Engineering, Pennsylvania State Universit,y University Park, Pennsylvania 16802-2701; e-mail: kavehrad@engr. psu.edu. 4Correspondence should be directed to M. R. Pakravan, Department of Electrical Engineering, University of Ottawa, 770 King Edward, Ottawa, Ontario, Canada, K1N 6N5.
Funding Information:
This research was supported by a grant from the Canadian Institute for Telecommunications Research under the NCE program of the Government of Canada.
PY - 1997
Y1 - 1997
N2 - Diffused infrared transmission is one of the preferred techniques used in indoor wireless communications. Tolerance to shadowing and a lack of alignment requirements are among the many advantages offered by this technique compared to the line-of-sight techniques. However, it has its disadvantages, namely high path loss and multipath dispersion. The limitation imposed by eye-safety requirements restricts the transmitted power. Therefore, efficient use of transmitted optical power is the key for practical broadband infrared systems. In this paper, we report on using a holographic diffuser for shaping of infrared radiation pattern in an indoor infrared transmission system. The holographic diffusers have the advantage of light weight and added flexibility in the system design. The reported measurements show that employing a properly designed holographic diffuser can reduce the path loss of a nondirected optical link. The results also show another advantage of using the proposed holographic diffuser, which is additional tolerance of the transmission to shadowing.
AB - Diffused infrared transmission is one of the preferred techniques used in indoor wireless communications. Tolerance to shadowing and a lack of alignment requirements are among the many advantages offered by this technique compared to the line-of-sight techniques. However, it has its disadvantages, namely high path loss and multipath dispersion. The limitation imposed by eye-safety requirements restricts the transmitted power. Therefore, efficient use of transmitted optical power is the key for practical broadband infrared systems. In this paper, we report on using a holographic diffuser for shaping of infrared radiation pattern in an indoor infrared transmission system. The holographic diffusers have the advantage of light weight and added flexibility in the system design. The reported measurements show that employing a properly designed holographic diffuser can reduce the path loss of a nondirected optical link. The results also show another advantage of using the proposed holographic diffuser, which is additional tolerance of the transmission to shadowing.
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U2 - 10.1023/A:1018876326494
DO - 10.1023/A:1018876326494
M3 - Article
AN - SCOPUS:0031248050
VL - 4
SP - 259
EP - 274
JO - International Journal of Wireless Information Networks
JF - International Journal of Wireless Information Networks
SN - 1068-9605
IS - 4
ER -