The Effect of Humidity and Temperature on Dielectric Fibre–Bound THz Transmission

Taherkhani, Mehdi; Sadeghzadeh, R. A.; Taiber, Jochen; Ornik, Jan; Koch, Martin

doi:10.1007/s10762-019-00644-7

Cited by 9 publications

(1 citation statement)

References 35 publications

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“…As discussed earlier, although, simple rod-in-air subwavelength fibers are easy to fabricate and potentially offer low propagation loss and low dispersion, however, mechanical manipulation of such fibers and their integration into systems is problematic due to significant extent of the modal fields into air [47]. Therefore, for practical applications, such fibers have to be encapsulated in such a way as not to significantly affect the weakly core-bound guided modes, while allowing direct mechanical handling of the fibers.…”

Section: Introductionmentioning

confidence: 99%

Dispersion Limited versus Power Limited Terahertz Transmission Links Using Solid Core Subwavelength Dielectric Fibers

Nallappan¹,

Cao²,

Xu³

et al. 2020

Preprint

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Terahertz (THz) band (0.1 THz-10 THz) is the next frontier for the ultra-high-speed communication systems. Currently, most of communications research in this spectral range is focused on wireless systems, while waveguide/fiber-based links have been less explored. Although free space communications have several advantages such as convenience in mobility for the end user, as well as easier multi-device interconnectivity in simple environments, the fiber-based communications provide superior performance in certain short-range communication applications such as multi-device connectivity in complex geometrical environments (ex. intra-vehicle connectivity), secure communications with low probability of eavesdropping, as well as secure signal delivery to hard-to-reach or highly protected environments. In this work, we present an in-depth experimental and numerical study of the short-range THz communications links that use subwavelength dielectric fibers for information transmission and define main challenges and tradeoffs in the link implementation. Particularly, we use air or foam-cladded polypropylene-core subwavelength dielectric THz fibers of various diameters (0.57-1.75 mm) to study link performance as a function of the link length of up to ~10 m, and data bitrates of up to 6 Gbps at the carrier frequency of 128 GHz (2.34 mm wavelength). We find that depending on the fiber diameter, the quality of the transmitted signal is mostly limited either by the modal propagation loss or by the fiber velocity dispersion (GVD). An error-free transmission over 10 meters is achieved for the bit rate of 4 Gbps using the fiber of smaller 0.57 mm diameter. Furthermore, since the fields of subwavelength fibers are weakly confined and extend deep into the air cladding, we study the modal field extent outside of the fiber core, as well as fiber bending loss. Finally, the power budget of the rod-in-air subwavelength THz fiber-based links is compared to that of free space communication links and we demonstrate that fiber links offer an excellent solution for various short-range applications.

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Section: Introductionmentioning

confidence: 99%

Dispersion Limited versus Power Limited Terahertz Transmission Links Using Solid Core Subwavelength Dielectric Fibers

Nallappan¹,

Cao²,

Xu³

et al. 2020

Preprint

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Wired THz Communications

Skorobogatiy

2022

J Infrared Milli Terahz Waves

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Transmission Characteristics of Flexible Low-Loss Solid Circular Polymer Dielectric Waveguides for Sub-THz Applications

Liao

Xue

et al. 2022

J Infrared Milli Terahz Waves

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This work investigates transmission characteristics of flexible solid circular polymer dielectric waveguides (SCPDWs) in the sub-THz band, especially those important for practical applications, including transmission loss, energy confinement and bending loss. In addition, the expanded polyethylene (EPE) cladding and interconnector are introduced to ensure good working conditions and quickly extend transmission length, respectively. The 1.5-mm-diameter SCPDW made of properly selected polytetrafluoroethylene (PTFE) is considered, which is flexible and low-loss. The simulation shows that more than 99% power can be confined in the 9-mm-diameter circular area when the frequency is over 90 GHz. The prototypes are fabricated and measured within 88-140 GHz. The measurement shows that the PTFE SCPDW has 0.5-4.8 dB/m loss, much lower than most reported solid polymer dielectric waveguides (SPDWs). A 30-mm-radius 90°bending is generally lossless in frequencies over 120 GHz, and adopting the polarization orthogonal to the bending direction can improve the bending loss. A 9-mm-diameter EPE cladding brings about 1 dB/m attenuation, which, however, dramatically reduces external interference on the PTFE SCPDW. The designed interconnector can easily extend the SCPDW transmission length with an acceptable ≤ 2-dB loss. The above results prove that the PTFE SCPDW and its corresponding cladding and interconnector can achieve good sub-THz high-speed wired interconnects. Though only a specific diameter is considered, the performances of SCPDWs with different diameters can

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The Effect of Humidity and Temperature on Dielectric Fibre–Bound THz Transmission

Cited by 9 publications

References 35 publications

Dispersion Limited versus Power Limited Terahertz Transmission Links Using Solid Core Subwavelength Dielectric Fibers

Dispersion Limited versus Power Limited Terahertz Transmission Links Using Solid Core Subwavelength Dielectric Fibers

Wired THz Communications

Transmission Characteristics of Flexible Low-Loss Solid Circular Polymer Dielectric Waveguides for Sub-THz Applications

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