Design and optimization of photonic crystal fiber with low confinement loss guiding 98 OAM modes in THz band

Kuiri, Bibhatsu; Dutta, Bubai; Sarkar, Nilanjana; Santra, Saikat; Mandal, Paulomi; Mallick, Khaleda; Patra, Ardhendu Sekhar

doi:10.1016/j.yofte.2021.102752

Cited by 20 publications

(7 citation statements)

References 44 publications

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“…A smaller A eff enhances the fiber's resistance to bending, while a larger A eff can reduce nonlinear losses. A eff can be calculated using equation (7) Chromatic dispersion (CD) is a critical parameter for evaluating the performance of optical fiber [26]. In digital fiber optic communication systems (FOC), CD leads to the broadening of optical pulses.…”

Section: Results and Analysismentioning

confidence: 99%

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Alleviating orbital angular momentum mode coupling between two ring-cores with different materials in a photonic crystal fiber for optical communication

Wang,

Yu,

Deng

et al. 2023

Phys. Scr.

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A dual-ring photonic crystal fiber (PCF) is proposed, which not only supports the stable transmission of orbital angular momentum (OAM) modes but also deftly mitigates interference of mode coupling between the two rings. This fiber design possesses two concentric ring-cores and claddings, each constructed from distinct materials, effectively functioning as independent OAM channels. Importantly, the absence of significant mode coupling between the OAM modes of the two ring-cores guarantees unhindered transmission of the dual rings. Remarkably, the outer ring can accommodate 82 OAM modes of transmission and the inner ring can accommodate 34 OAM modes of transmission. High mode quality (>94.13%) is observed for all OAM modes in both inner and outer rings at wavelengths from 1.5 to 1.6 µm. This special design ensures that the modes in the outer ring have excellent performance and also maintains the modes in the inner ring as unaffected by the outer ring to the greatest extent.

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Section: Results and Analysismentioning

confidence: 99%

“…Among these, photonic crystal fibers (PCFs) have emerged as a prime candidate, offering high capacity and exceptional performance for stable OAM mode transmission. The shape of the hollow PCF matches the profile of the OAM mode, which has better performance and more quantity in transmitting the OAM mode [7][8][9][10].…”

Section: Introductionmentioning

confidence: 94%

Alleviating orbital angular momentum mode coupling between two ring-cores with different materials in a photonic crystal fiber for optical communication

Wang,

Yu,

Deng

et al. 2023

Phys. Scr.

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show abstract

“…The confinement loss in a fiber refers to the decrease in optical power caused by the leakage of light from the core region [24]. It occurs when light is not perfectly confined within the core, resulting in the spreading of light energy into the cladding region of the fiber.…”

Section: Analysis and Discussionmentioning

confidence: 99%

Improving orbital angular momentum mode transmission with imperfect ring–core fiber

Wang,

Yu,

Deng

et al. 2024

J. Opt.

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Orbital Angular Momentum (OAM), inherent to light beams characterized by helical phase fronts, represents an alternative spatial degree of freedom for photons. In recent years, OAM-based communication has gained significant attention as a potential solution to increase the capacity and spectral efficiency of optical fiber communication systems. In optical fibers, OAM modes can be generated and manipulated by utilizing specialized optical components and techniques. One approach involves using specially designed optical fibers, such as ring-core fibers, which have the capability to support multiple OAM modes. In the manufacturing process, the ring fiber is hardly made perfectly, especially the doped-cores. The introduced defect breaks the symmetry of the ring-core, which has a serious impact on OAM mode transmission. Using a material with a slightly higher refractive index than the cladding to wrap the ring-core is effective in reducing impairment of defects. After numerical simulation, the proposed method improves the walk-off length by a factor of 2-40.

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“…The design process, characteristics, and multiplexing application capacity of the proposed fiber are thoroughly discussed. The proposed fiber with optimal structural parameters can transmit 132 OAM modes in the range of 0.6 ∼ 1.5 THz with high purity (>94.83%) and flat near-zero dispersion, which provides more THz OAM modes and wider broadband than the reported fibers for THz OAM modes transmission [16][17][18][19][20][21][22], hence the designed fiber is expected to be applied in fiber-based large capacity OAM-MDM + CDM + WDM communication system.…”

Section: Introductionmentioning

confidence: 98%

“…However, the previous reports of OAM mode multiplexing in multi-core fiber are in optical or radio frequency rather than THz band, which does not maximize the capacity owing to the lacking of the spectra expanding [5,6,[10][11][12][13][14][15]. Moreover, the fibers for THz OAM transmission have rarely been reported and are all featured single-core with few numbers of channels and relatively narrow operating bandwidth, hence limited capacity enlargement [16][17][18][19][20][21][22]. In view of the reported multi-OAM multi-core fiber and THz OAM fiber, a laudable goal would be to combine multi-core fiber and THz OAM mode multiplexing together to realize ultrahigh data capacity and spectral efficiency from the perspective of multi-dimensional multiplexing and spectrum expanding, which is a disruptive technology for the next generation of optical networks.…”

Section: Introductionmentioning

confidence: 99%

Terahertz fiber with multi-concentric ring cores for OAM modes propagation

et al. 2023

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A novel fiber incorporating central hollow, porous isolated layers, and concentric ring cores is proposed for the simultaneous propagation of multi-terahertz (THz) orbital angular momentum (OAM) modes with low-level inter-core and inter-mode crosstalk. The designed fiber can efficiently support 132 OAM modes in 0.6~1.5 THz, 178 OAM modes in 0.7~1.5 THz, etc., the high-order radial modes are suppressed within the whole frequency range meanwhile, and the number of OAM modes can be further boosted by further increasing the number of ring cores. In addition, the fiber has low confinement loss, flat dispersion, and high purity over a wide operating range. Hence it can be applied in mode-division multiplexing (MDM) based on OAM combined with core-division multiplexing (CDM) in THz range, and is also compatible with wavelength-division multiplexing (WDM) and multi-level modulation formats. The realized fiber is expected to dramatically extend the transmission capacity and spectral efficiency.

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Design and optimization of photonic crystal fiber with low confinement loss guiding 98 OAM modes in THz band

Cited by 20 publications

References 44 publications

Alleviating orbital angular momentum mode coupling between two ring-cores with different materials in a photonic crystal fiber for optical communication

Alleviating orbital angular momentum mode coupling between two ring-cores with different materials in a photonic crystal fiber for optical communication

Improving orbital angular momentum mode transmission with imperfect ring–core fiber

Terahertz fiber with multi-concentric ring cores for OAM modes propagation

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