A Novel Polarization-Multiplexing System for Free-Space Optical Links

Xie, Guodong; Wang, Fangxiang; Dang, Anhong; Guo, Hong

doi:10.1109/lpt.2011.2163501

Cited by 36 publications

(12 citation statements)

References 12 publications

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“…Each of these polarized signals is modulated independently by the MZM and finally the output from these two modulators are combined by means of a polarization beam combiner (PBC). Therefore, the PolSK signal is given as [21];…”

Section: Polsk Modulation Schemementioning

confidence: 99%

Optical carrier suppression with modified duo binary return to zero and polarization shift keying modulation schemes over free space communication system

Magidi

Pondani

2019

SN Appl. Sci.

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Free space optical (FSO) communication has been a subject of interest for researcher and the corporate world since a few decades ago. This has been motivated by the huge benefits associated with this technology. Meanwhile, the generation and all optical up conversion of millimeter wave (mmw) for propagation in a FSO channel has been an important research direction. In this article, a single side band tone mmw generated by the optical carrier suppression (OCS) method has been modulated by modified duo-binary return to zero (MDRZ) and polarization shift keying (PolSK) modulated baseband data. The resulting optical signal was propagated in a FSO cannel subjected to combined weather and atmospheric turbulence induced fading. Later on, a comparative analysis was carried out between hybrid OCS/MDRZ and OCS/PolSK mmw signals propagated over free space. Using the performance metrics such as the bit error rate, quality (Q) factor and the received power among others, the simulation results indicated that hybrid OCS/MDRZ performs better than hybrid OCS/PolSK.

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Section: Polsk Modulation Schemementioning

confidence: 99%

Optical carrier suppression with modified duo binary return to zero and polarization shift keying modulation schemes over free space communication system

Magidi

Pondani

2019

SN Appl. Sci.

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“…Polarization-multiplexing is an optical scheme utilized to multiply the channel capacity of FSO communications. The adoption of a polarization-multiplexing scheme allows multiplying the channel capacity, as different wavelengths can be delivered with orthogonal states [9]- [12]. PAM4 modulation is another optical scheme utilized to multiply the channel capacity of FSO communications.…”

Section: Introductionmentioning

confidence: 99%

A 448-Gb/s PAM4 FSO Communication With Polarization-Multiplexing Injection-Locked VCSELs Through 600 M Free-Space Link

Tsai

et al. 2020

IEEE Access

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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 fourwavelength 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 × 4 wavelengths × 2 polarizations (x-and y-polarizations)]. The results show that four 1.55 µm 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.

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“…spectral efficiency. 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.…”

Section: Introductionmentioning

confidence: 99%

500 Gb/s PAM4 FSO-UWOC Convergent System With a R/G/B Five-Wavelength Polarization-Multiplexing Scheme

Tsai

et al. 2020

IEEE Access

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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 FSO-UWOC 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.

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A Novel Polarization-Multiplexing System for Free-Space Optical Links

Cited by 36 publications

References 12 publications

Optical carrier suppression with modified duo binary return to zero and polarization shift keying modulation schemes over free space communication system

Optical carrier suppression with modified duo binary return to zero and polarization shift keying modulation schemes over free space communication system

A 448-Gb/s PAM4 FSO Communication With Polarization-Multiplexing Injection-Locked VCSELs Through 600 M Free-Space Link

500 Gb/s PAM4 FSO-UWOC Convergent System With a R/G/B Five-Wavelength Polarization-Multiplexing Scheme

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