Fig. 1. Scenario of the fiber–THz–fiber communication system based on full photonic up- and down-conversions.

Fig. 2. Experimental setup of the fiber–THz–fiber full photonic D-band communication system. (a)–(b) Optical spectra at points A and B.

Fig. 3. (a) Photograph of the MUTC-PD module; (b) frequency response versus photocurrent at 1 V reverse bias; (c) variations of output RF power with photocurrent under different frequencies.

Fig. 4. (a) NGMIs of 25-Gbaud 16-QAM signal versus center frequency; (b) NGMIs versus the optical power at point A; (c) NGMIs versus the optical power at point B; (d) NGMIs versus the 16-QAM signal baud rate.

Fig. 5. (a) NDRs with different baud rates and corresponding scaling factor v values of PS-64-QAM signals; (b) probability distributions of transmitted and received constellations.

Fig. 6. (a) NDRs versus optical power at point A and corresponding scaling factor v values of PS-16-QAM and PS-64-QAM signals; (b) probability distributions of transmitted and received constellations of PS-16-QAM and PS-64-QAM signals when the optical powers at point A are 16 and 23 dBm, respectively.