A 100 m/320 Gbps SDM FSO link with a doublet lens scheme

Li, Chung-Yi; Lu, Hai‐Han; Lu, Ting-Chien; Wu, Chi‐Jui; Chu, Chien-An; Lin, Hung-Hsien; Cheng, Ming-Te

doi:10.1088/1612-2011/13/7/075201

Cited by 12 publications

(5 citation statements)

References 8 publications

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“…Atmospheric turbulence and noise due to other lights are considered in bit error rate (BER) evaluation. With the deployment of doublet lenses between two buildings [18], [19], the BER and PAM4 eye diagrams perform well in this illustrated PAM4 FSO communication based on polarizationmultiplexing injection-locked VCSELs. This demonstrated 448-Gb/s PAM4 FSO communication affords a prominent one for its high aggregate transmission capacity and develops the scenario realized by integrating four-wavelength polarization-multiplexing with PAM4 modulation schemes.…”

Section: Introductionmentioning

confidence: 79%

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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Section: Introductionmentioning

confidence: 79%

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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“…And further, with optical PAM4 modulation, the BER is greatly demoted to 10 −6 (from 10 −9 to 10 −6 ). This poor BER performance is owing to the fiber dispersion associated with 40 km SMF transmission, atmospheric attenuation because of the 200 m free-space link, and coupling loss from the laser beam being coupled from doublet lens 2 to fiber's ferrule [32], [33]. Over a 40-km SMF span, distortions produced by fiber dispersion deteriorate the BER performance by reason of the innate trait of the optical PAM4 signal with wide linewidth.…”

Section: Resultsmentioning

confidence: 99%

A Hybrid Internet/CATV/5G Fiber-FSO Integrated System With a Triple-Wavelength Polarization Multiplexing Scenario

et al. 2019

IEEE Access

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A hybrid Internet/cable television (CATV)/5G fiber-free-space optical (FSO) integrated system with a triple-wavelength polarization multiplexing scenario is attainably demonstrated for the first time. In a triple-wavelength polarization multiplexing scenario with vestigial sideband (VSB) four-level pulse amplitude modulation (PAM4)/CATV/16-quadrature amplitude modulation (QAM)-orthogonal frequencydivision multiplexing (OFDM) modulation, the channel capacity is considerably multiplied and the overall performance is significantly improved. With a tunable optical band-pass filter, polarization-tracking free de-multiplexing is attained by removing other wavelengths with different polarizations, and the optical VSB PAM4/CATV/16-QAM-OFDM signal is created by partially reducing the optical signal's linewidth. Compared with established polarization multiplexing fiber-FSO integrations with complex polarization de-multiplexing mechanism, it demonstrates a notable one with the benefits of simplicity and flexibility. Sufficiently low bit error rate, acceptable PAM4 eye diagrams, clear constellation map, and high composite second-order/composite triple beat values are attained through a 40 km single-mode fiber transport with 200 m free-space link. This demonstrated triple-wavelength polarization multiplexing fiber-FSO integrated system is promising because it not only incorporates fiber backhaul with optical wireless feeder, but it also simplifies system's structure and enhance system's overall performance. INDEX TERMS Fiber-FSO integrated system, optical VSB filter, polarization multiplexing scenario, tunable optical band-pass filter, triple-wavelength.

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“…FSO links use multi-beam systems (spatial diversity) to address temporary obstructions and provide greater availability. Moreover, 400 Gbps/100 m FSO links with the SDM technique and a doublet lens scheme [2], as illustrated in figure 4, could also be deployed as a substitute for the proposed 400 Gbps/100 m DWDM/SDM FSO links. Each light is emitted in an independent optical link, and a 16-channel SDM FSO link is established.…”

Section: Resultsmentioning

confidence: 99%

“…The free-space optical (FSO) link is an optical communication technology that uses light propagating in free space to transmit data wirelessly for the internet, telecommunications, and computer networking [1][2][3][4][5][6]. An FSO link is developed to create a high-speed, high-security, and friendly link with a highbandwidth light signal instead of a radio frequency signal.…”

Section: Introductionmentioning

confidence: 99%

A 400 Gbps/100 m free-space optical link

Lin

et al. 2017

Laser Phys. Lett.

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A 400 Gbps/100 m free-space optical (FSO) link with dense-wavelength-division-multiplexing (DWDM)/space-division-multiplexing (SDM) techniques and a doublet lens scheme is proposed. To the best of our knowledge, this is the first time that a link adopting DWDM and SDM techniques and a doublet lens scheme has demonstrated a 400 Gbps/100 m FSO link. The experimental results show that the free-space transmission rate is significantly enhanced by the DWDM and SDM techniques, and the free-space transmission distance is greatly increased by the doublet lens scheme. A 16-channel FSO link with a total transmission rate of 400 Gbps (25 Gbps/λ × 16 λ = 400 Gbps) over a 100 m free-space link is successfully demonstrated. Such a 400 Gbps/100 m DWDM/SDM FSO link provides the advantages of optical wireless communications for high transmission rates and long transmission distances, which is very useful for high-speed and long-haul light-based WiFi (LiFi) applications.

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A 100 m/320 Gbps SDM FSO link with a doublet lens scheme

Cited by 12 publications

References 8 publications

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

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

A Hybrid Internet/CATV/5G Fiber-FSO Integrated System With a Triple-Wavelength Polarization Multiplexing Scenario

A 400 Gbps/100 m free-space optical link

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