A 448-Gb/s PAM4 FSO Communication With Polarization-Multiplexing Injection-Locked VCSELs Through 600 M Free-Space Link
| Autor: | Yong-Cheng Huang, Wen-Shing Tsai, Jing-Yan Xie, Qi-Ping Huang, Hsiao-Wen Wu, Shi-Cheng Tu, Hai-Han Lu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
General Computer Science
Physics::Optics injection-locked VCSELs FSO communication 02 engineering and technology polarization-multiplexing scheme 01 natural sciences Multiplexing Vertical-cavity surface-emitting laser 010309 optics 020210 optoelectronics & photonics Optics 0103 physical sciences 0202 electrical engineering electronic engineering information engineering General Materials Science Physics business.industry PAM4 modulation General Engineering Polarization (waves) Injection locking Wavelength Transmission (telecommunications) Pulse-amplitude modulation Bit error rate lcsh:Electrical engineering. Electronics. Nuclear engineering business lcsh:TK1-9971 |
| Zdroj: | IEEE Access, Vol 8, Pp 28859-28866 (2020) |
| ISSN: | 2169-3536 |
| Popis: | A 448-Gb/s four-level pulse amplitude modulation (PAM4) free-space optical (FSO) communication through 600 m free-space link was constructed, utilizing polarization-multiplexing injection-locked vertical-cavity surface-emitting lasers (VCSELs) for presentation. When uniting four-wavelength polarization-multiplexing and PAM4 modulation schemes, the transmission capacity of FSO communications is substantially multiplied, with an aggregate transmission rate of 448 Gb/s [56 Gb/s PAM4/wavelength $\times 4$ wavelengths $\times 2$ polarizations ( $x$ - and $y$ -polarizations)]. The results show that four $1.55~\mu \text{m}$ VCSEL transmitters with injection locking technique are sufficiently powerful for 448 Gb/s PAM4 signal transmission. Adopting a tunable optical band-pass filter and a polarization beam splitter for wavelength filtering and polarization de-multiplexing, the polarized wavelengths are effectually filtered and de-multiplexed in each polarized state. As the polarization state is well preserved in the scenario over 600 m free-space transmission, a sophisticated polarization tracker is not required in this proposed FSO communication. High bit error rate performance and accepted PAM4 eye diagrams are attained through 600 m free-space transmission. The four-wavelength polarization-multiplexing PAM4 FSO communication established here reveals the prominent benefits of high aggregate transmission capacity and long-distance free-space link. |
| Databáze: | OpenAIRE |
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