Analog signal processing in the terahertz communication links using waveguide Bragg gratings: example of dispersion compensation

Ma, Tian; Nallapan, Kathirvel; Guerboukha, Hichem

doi:10.1364/oe.25.011009

Cited by 49 publications

(10 citation statements)

References 40 publications

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“…To increase data transmission rates in fiber links, the modal dispersion (as well as modal loss) can be reduced by reducing the fiber diameter to deep subwavelength sizes, however it comes with a higher sensitivity to bending and larger mode diameters. Alternatively, dispersion compensation techniques can be used to compensate for the fiber-link dispersion as we have recently demonstrated using strong hollow-core waveguide Bragg grating [75], however such devices tend to have limited operation bandwidth and further studies are necessary to establish feasibility of this approach. Alternatively, using higher order modulation schemes such as orthogonal frequency division multiplexing (OFDM), the effect of dispersion can be minimized due to smaller bandwidth required at each carrier frequency [76].…”

Section: Thin Thread Fiber Holder 90 Bendmentioning

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: Thin Thread Fiber Holder 90 Bendmentioning

confidence: 99%

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

Nallappan¹,

Cao²,

Xu³

et al. 2020

Preprint

Self Cite

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“…With the advent of dramatic resolution improvement of 3D printing technology, researchers and engineers have widely employed 3D printing for the fabrication of THz waveguides and components [30][31][32][33][34]. In particular, stereo-lithographic apparatus (SLA) has been proven to be an effective method for the fabrication of THz waveguides and devices.…”

Section: Fabrication Of the Bragg Waveguide Using 3d Printing Technologymentioning

confidence: 99%

Photonic Bragg waveguide platform for multichannel resonant sensing applications in the THz range

Wang

2020

Biomed. Opt. Express

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In this paper, we study a photonic Bragg waveguide sensor for resonant sensing applications in the THz range. In order to enhance the resolution and detectivity of the sensor, we modify the relatively broad transmission spectrum of the Bragg waveguide with spectrally narrow transmission dips by creating a geometrical defect in Bragg reflector and causing anti-crossing phenomenon between the core-guided mode and defect mode. The spectral position of the resonant dip is highly sensitive to the thickness variation in the vicinity of the waveguide core. By designing and manufacturing a Bragg waveguide which includes several sections with different defect layer thicknesses, we can interrogate more than one sample simultaneously and thereby realize multichannel resonant sensing by directly tracking the independent resonant dips. Furthermore, we demonstrate the waveguide platform for online monitoring of the thickness variation of lactose powders, which is captured on the waveguide core via a centrifugal force using a home-built rotating setup. Additionally, we also demonstrate the waveguide for fingerprint detection of powder analytes, which further enriches the sensing scenario of the sensing platform. Finally, we discuss the advantages and the spectral tailoring flexibility of the THz Bragg waveguides sensors for future implementations.

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“…RAGG gratings have developed extensive applications in optical devices for communication [1]- [3], sensing [4], [5], signal processing [6]- [9], etc. In recent years, the development of integrated on-chip Bragg gratings has become an inevitable trend, and tremendous amount of researches on waveguide Bragg gratings has emerged [10]- [12].…”

Section: Introductionmentioning

confidence: 99%

Large Group Delay in Silicon-on-Insulator Chirped Spiral Bragg Grating Waveguide

et al. 2021

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Limited by large transmission loss, the development of transverse electric (TE) mode silicon-oninsulator (SOI) based on-chip long length chirped grating waveguide faces many difficulties now. To overcome this problem, multi-mode waveguide with a measured transmission loss of 0.7 dB/cm is applied in this paper, and a chirped spiral Bragg grating waveguide (SBGW) is proposed and experimentally demonstrated. The length of the chirped SBGW reaches 2.7 cm, which is the longest SOI based grating reported so far. The total group delay is measured to be 628 ps, with a structure size of only 0.3 mm 2 due to the application of spiral configuration. The slope of the linear dispersion is -27.7 ps/nm. This integrated chirped SBGW shows great compatibility with frequently used TE mode SOI devices and has great potential for applications in microwave photonics requiring dispersion control.

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Analog signal processing in the terahertz communication links using waveguide Bragg gratings: example of dispersion compensation

Cited by 49 publications

References 40 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

Photonic Bragg waveguide platform for multichannel resonant sensing applications in the THz range

Large Group Delay in Silicon-on-Insulator Chirped Spiral Bragg Grating Waveguide

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