Abstract
A 500-Gb/s four-level pulse amplitude modulation (PAM4) free-space optical (FSO)underwater wireless laser transmission (UWOC) convergent system over 100 m free-space transmission with either 10 m piped underwater link or 5 m turbid underwater link is established, employing a red/green/blue (R/G/B) five-wavelength polarization-multiplexing scheme as a demonstration for the first time. Integrating PAM4 modulation with five-wavelength polarization-multiplexing scheme, the channel capacity of FSOUWOC convergent systems is significantly increased with an aggregate data rate of 500 Gb/s [50 Gb/s PAM4/wavelength × 5 wavelengths × 2 polarizations (p- and s-polarizations)]. Results reveal that five R/G/B laser diode (LD) transmitters with two-stage light injection and optoelectronic feedback techniques are capably adopted for 500 Gb/s PAM4 signal transmission. Compared with prior FSO-UWOC convergence and visible light communication using polarization-multiplexing R/G/B LDs, it shows a prominent one with the benefits of high aggregate transmission rate and long-range optical wireless link. Excellent bit error rate performance and accepted PAM4 eye diagrams are attained over a 110-m/105-m FSO-UWOC link. This demonstrated five-wavelength polarization-multiplexing FSO-UWOC convergent system is promising because it not only integrates free-space backbone with underwater optical wireless feeder, but it also substantially multiplies total channel capacity.
Highlights
Free-space optical (FSO)-underwater wireless optical communication (UWOC) convergent system is a promising one to conquer the connectivity difficulties [1]–[4]
Polarization-multiplexing scheme has been investigated for supplying high channel capacity [5]–[7], it thoroughly fits the configuration of FSO-UWOC convergent system
These significant enhancements in 3-dB bandwidth reveal that blue, green, and red-light laser diode (LD) with two-stage light injection and optoelectronic feedback techniques are effectual for building a 500-Gb/s PAM4 FSO-UWOC convergent system
Summary
Free-space optical (FSO)-underwater wireless optical communication (UWOC) convergent system is a promising one to conquer the connectivity difficulties [1]–[4]. Polarization-multiplexing scheme has been investigated for supplying high channel capacity [5]–[7], it thoroughly fits the configuration of FSO-UWOC convergent system. With polarization-multiplexing scheme, the channel capacity of FSO-UWOC convergence can be largely increased. To further improve the channel capacity and spectral efficiency, four-level pulse amplitude modulation (PAM4) instead of none-return-to-zero modulation is adopted to reach the goal of high-transmission-rate and enhanced spectral efficiency [8]–[10]. A 500-Gb/s PAM4 FSO-UWOC convergent system through 100 m free-space transmission with either 10 m piped underwater link or 5 m turbid underwater link is proposed, employing a red/green/blue (R/G/B) five-wavelength
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