A review of higher-order mode pass filtering techniques

Saha, Prapty; Rasel, M. Salauddin; Ahmmed, Kazi Tanvir

doi:10.1016/j.heliyon.2022.e11705

Cited by 5 publications

(1 citation statement)

References 38 publications

(66 reference statements)

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“…The coupling coefficient depends on the gap between the waveguides and the effective refractive index of the waveguide. The calculated coupling coefficient for λ 1 and λ 2 nm are К a = and К b = 25 .…”

Section: Design and Optical Intensity Distributionmentioning

confidence: 95%

Highly efficient and selective integrated directional couplers for multigas sensing applications

Thottoli,

Biagi,

Vorobev

et al. 2023

Sci Rep

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The design and fabrication of a compact, low-loss, broadband directional coupler (DC) based duplexer operating in the near-infrared (NIR) region are demonstrated. The duplexer exhibits high selectivity and coupling efficiency (CE), for target wavelengths of 1530 nm and 1653.7 nm, making it applicable in systems for the multi-gas detection of ammonia and methane. The measured CE for the duplexer is 73% and 76% at 1530 nm and 1653.7 nm respectively. These results demonstrate the effectiveness of the duplexer as a broadband and scalable power source for highly sensitive sensing techniques, like quartz-enhanced photoacoustic spectroscopy (QEPAS). Its compact size and low-loss characteristics make it highly portable and well-suited for drone-based multi-gas detection applications.

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Section: Design and Optical Intensity Distributionmentioning

confidence: 95%

Highly efficient and selective integrated directional couplers for multigas sensing applications

Thottoli,

Biagi,

Vorobev

et al. 2023

Sci Rep

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An efficient nonparaxial and bidirectional wave propagation method for optical fibers & fiber components

Kumar,

Sharma

2024

Optics Communications

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Theoretical design of an ultra-broadband all-fiber filter covering O+E+S+C+L+U communication band based on cascaded tilted long-period fiber gratings near phase-matching turning point

Wang,

Gu,

Ling

et al. 2024

J. Opt. Soc. Am. B

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In this paper, a novel, to the best of our knowledge, ultra-broadband all-fiber filter is proposed and designed, which is composed of two (or more) continuously tilted long-period fiber gratings (TLPFGs) with different grating tilt angles and the same actual period. For the filter constructed with two TLPFGs, one TLPFG is operated in a dual-peak resonance state to produce two resonance peaks, and the other TLPFG is operated at the phase-matched turning point to produce a broadband resonance peak. The three resonance peaks are superimposed, resulting in a large broadband peak. Based on the mode coupling theory, the effects of structural parameters such as grating axial period, actual period, tilt angle, and grating length on the characteristics of this filter are analyzed, and an effective method for selecting structural parameters is given. The simulation results show that when the actual period of the two TLPFGs is 170 µm, the tilt angles are 21.961° and 19.639°, and the grating lengths are 0.95 cm and 0.96 cm, respectively, the filter bandwidth can reach up to 440 nm, which can cover the E–U bands. In addition, cascaded multiple TLPFG ultra-broadband filters with different tilt angles are discussed. The cascaded multiple segment TLPFG filter can realize ultra-broadband filtering in the range of 1200–2000 nm, and easily covers the O–U bands. The all-fiber optic filter proposed in this paper has the advantages of simple structure, easy production, low cost, and high filtering capability, which makes it competitive in communication and sensor systems.

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A review of higher-order mode pass filtering techniques

Cited by 5 publications

References 38 publications

Highly efficient and selective integrated directional couplers for multigas sensing applications

Highly efficient and selective integrated directional couplers for multigas sensing applications

An efficient nonparaxial and bidirectional wave propagation method for optical fibers & fiber components

Theoretical design of an ultra-broadband all-fiber filter covering O+E+S+C+L+U communication band based on cascaded tilted long-period fiber gratings near phase-matching turning point

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