Optical digital transmission of HDTV signals for 'contribution' use

The key technologies for a 1.2 Gb/s HDTV optical digital transmission system for contribution service use are addressed. A wide-dynamic-range optical receiver is described. Attained average received optical power for an error rate of 10/sup -9/ was from -6 dBm to -38 dBm, with an optical dynamic range of 32 dB. This system provides for transmission lengths from a few meters to up to 80 km. It was confirmed that the system developed is available for interconnecting HDTV equipment within a studio and for dispatching HDTV programs from a production site to a postproduction studio. Scrambled-8B1C NRZ line coding was used to keep clock recovery reliable in the receiver. The line-coding circuit satisfies the BSI (bit sequence independent) property and can be easily implemented using commercial high speed ECL devices.<
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