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4550HWL01

# 4550HWL01 - Line-of-Sight Optical Communications It is...

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Unformatted text preview: Line-of-Sight Optical Communications It is desired to build a line-of-sight laser optical communications system con- necting the Van Leer Electrical Engineering building and the Bell South building. The distance between the buildings is 1045 m. For safety reasons, a Visible wavelength is needed. Therefore, it is decided to use a semiconductor diode laser of wavelength 620.0 nm. Also, for safety reasons, the diameter of the laser beam at the Bell South receiver needs to be no more than 150 mm. A beam—expander collimator is to be used with the diode laser at Georgia Tech. Calculate, showing all work, the output diameter of the beam from the collimator at Georgia Tech in order to produce a beam of 150 mm diameter at Bell South. Express your answer in millimeters accurately to four signiﬁcant ﬁgures. Put your ﬁnal answer in the space provided. Output laser beam diameter : mm. Line-of-Sight Optical Communications Far—ﬁeld angle measured to Bell South building 0 z W = 0.0001435md = 0.008224deg 1045m Far—ﬁeld angle due to diffraction by an aperture (collimator) of diameter D 9:3 7r 1 D g = 5.4995 mm 4 D:— 7r ...
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4550HWL01 - Line-of-Sight Optical Communications It is...

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