Optical Television Link Employing a Digitally Modulated Laser

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: An experimental, through-the-air, digital television link is described. It can carry one NTSC color television picture signal and two high quality sound signals across a distance of 1 km in clear air. The television signal is PCM encoded at 3Fsc = 10.7 MHz, 8 bits/sample. The audio signals are PCM encoded at 31.5 kHz, 14 bits/sample. A new serial digital code called “reverse alternating codeword, non-return to zero” (RAC-NRZ) is described. It consists of complementing every other codeword during the conversion of the video and audio to a serial bit stream. The optical television link employs a gallium aluminum arsenide injection laser at the transmitter and an avalanche photodiode at the receiver. The link is essentially transparent to the PCM encoded signal and it produces excellent quality picture and sound whenever operating above threshold.
Publication Date: 1979-06-01
DOI: 10.5594/J06660
Link: https://doi.org/10.5594/J06660
Author(s): A. A. Goldberg, S. Juchnowycz, J. Rossi

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A. A. Goldberg, S. Juchnowycz, and J. Rossi; Optical Television Link Employing a Digitally Modulated Laser, SMPTE Journal ( Volume: 88, Issue: 6, June 1979); SMPTE, 1979. Available at https://doi.org/10.5594/J06660

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A. A. Goldberg, S. Juchnowycz, and J. Rossi; Optical Television Link Employing a Digitally Modulated Laser, SMPTE Journal ( Volume: 88, Issue: 6, June 1979); SMPTE, 1979. Available at https://doi.org/10.5594/J06660

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<span class="citation">A. A. Goldberg, S. Juchnowycz, and J. Rossi; <cite>Optical Television Link Employing a Digitally Modulated Laser</cite>, SMPTE Journal ( Volume: 88, Issue: 6, June 1979); SMPTE, 1979. Available at <a href="https://doi.org/10.5594/J06660" target="_blank" rel="noopener">https://doi.org/10.5594/J06660</a></span>

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A. A. Goldberg, S. Juchnowycz, and J. Rossi; Optical Television Link Employing a Digitally Modulated Laser, SMPTE Journal ( Volume: 88, Issue: 6, June 1979); SMPTE, 1979
doi: 10.5594/J06660
url: https://doi.org/10.5594/J06660

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<li>
A. A. Goldberg, S. Juchnowycz, and J. Rossi; <cite id="bib-10-5594-j06660">Optical Television Link Employing a Digitally Modulated Laser</cite>, SMPTE Journal ( Volume: 88, Issue: 6, June 1979); SMPTE, 1979
<span class="doi">10.5594/J06660</span>
</li>