In this paper, optoelectronic technology is used to effectively utilize bandwidth resources in the band of 110-170 GHz, thereby increasing system capacity. We use the flexible control characteristics of the operating frequency of optoelectronic technology, and large-scale frequency hopping communications are realized to avoid potential interference. We have achieved 24 Gbps full-band sub-THz transmission over 4.6 km within the continuous range of 110-170 GHz in the dense fog simulation environment based on advanced optoelectronic technology, and the carrier frequency is continuously adjustable with an accuracy value of less than 0.2%. In the continuous range of 125-155 GHz, demonstrations of full-band 40 Gbps over 4.6 km are reported. Our work is of reference significance for high-speed long-haul sub-THz band communication under stringent conditions.