Abstract
We propose and experimentally demonstrate THz photonic wireless communication systems with 16-QAM modulation in the 375-450 GHz band. The overall throughput reaches as high as 80 Gbit/s by exploiting four THz channels with 5 Gbaud 16-QAM baseband modulation per channel. We create a coherent optical frequency comb (OFC) for photonic generation of multiple THz carriers based on photo-mixing in a uni-travelling carrier photodiode (UTC-PD). The OFC configuration also allows us to generate reconfigurable THz carriers with low phase noise. The multiple-channel THz radiation is received by using a Schottky mixer based electrical receiver after 0.5 m free-space wireless propagation. 2-channel (40 Gbit/s) and 4-channel (80 Gbit/s) THz photonic wireless links with 16-QAM modulation are reported in this paper, and the bit error rate (BER) performance for all channels in both cases is below the hard decision forward error correction (HD-FEC) threshold of 3.8e-3 with 7% overhead. In addition, we also successfully demonstrate hybrid photonic wireless transmission of 40 Gbit/s 16-QAM signal at carrier frequencies of 400 GHz and 425 GHz over 30 km standard single mode fiber (SSMF) between the optical baseband signal transmitter and the THz wireless transmitter with negligible induced power penalty.
Highlights
There has been an explosive growth of the demand for data rates in both wired and wireless communications over recent decades, mainly driven by increased user adoption of higher speed services, such as ultrahigh definition (UHD) data, download of large volume of data, ultrafast intra/inter-chip data exchange, fast restoration of network connections in disaster areas, and so on, and a trend seems likely to continue for the coming decade [1,2,3,4]
We propose and experimentally demonstrate THz photonic wireless communication systems with 16-QAM modulation in the 375-450 GHz band
The overall throughput reaches as high as 80 Gbit/s by exploiting four THz channels with 5 Gbaud 16QAM baseband modulation per channel
Summary
There has been an explosive growth of the demand for data rates in both wired and wireless communications over recent decades, mainly driven by increased user adoption of higher speed services, such as ultrahigh definition (UHD) data, download of large volume of data, ultrafast intra/inter-chip data exchange, fast restoration of network connections in disaster areas, and so on, and a trend seems likely to continue for the coming decade [1,2,3,4]. Combining the employment of spectrally efficient modulation format 16-QAM and the exploration of more THz bandwidth is expected to significantly improve the THz wireless capacity In this context, we propose and experimentally demonstrate a four-channel THz photonics communication system in the 375-450 GHz band with 5 Gbaud 16- QAM baseband data modulation per channel, reaching an overall throughput as high as 80 Gbit/s. The BER measurement for two channels after 30 km SSMF optical baseband transmission is shown, where an eye diagram and a constellation corresponding to the BER of 1.6 × 10−3 and 1.8 × 10−2 respectively are displayed In both cases, we can observe that the BER performance of all channels has been achieved below the HD-FEC threshold of 3.8 × 10−3 with 7% overhead. This is because the loss of the 30 km SSMF transmission can be compensated by using low-noise EDFA-3 followed by a 9-nm OBPF
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