Wideband and Low Dispersion Slow Light in Lattice-Shifted Photonic Crystal Waveguides

Tang, Jian; Wang, Tao; Li, Xiaoming; Wang, Boyun; Dong, Chuanbo; Gao, Lei; Liu, Bo; He, Yuefeng; Yan, Wei

doi:10.1109/jlt.2013.2280716

Cited by 20 publications

(10 citation statements)

References 25 publications

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“…Fig. 4 shows [20], the absolute value of β 2 in our low-dispersion region is nearly three orders of magnitude smaller. Therefore, our lowdispersion criterion is much stricter than that usually employed.…”

Section: Resultsmentioning

confidence: 71%

Tunable Slow Light with Large Bandwidth and Low-dispersion in Photonic Crystal Waveguide Infiltrated with Magnetic Fluids

Lei¹,

Pu²

2015

Journal of Magnetics

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Two kinds of magnetic fluids with different volume fractions are symmetrically filled into the W0.9 photonic crystal waveguide structure. The 2D plane-wave expansion method is used to investigate the slow light properties numerically. The constant group index criterion is employed to evaluate the slow light performance. The wavelength bandwidth Δλ centering at λ 0 = 1550 nm varies from 32.4 to 44.2 nm when the magnetic field factor α || changes from 0 to 1. And the corresponding normalized delay bandwidth product can be tuned from 0.221 to 0.258. For comparison and optimization, two infiltration cases are investigated and the more advantageous infiltration scheme is found.

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Section: Resultsmentioning

confidence: 71%

Tunable Slow Light with Large Bandwidth and Low-dispersion in Photonic Crystal Waveguide Infiltrated with Magnetic Fluids

Lei¹,

Pu²

2015

Journal of Magnetics

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“…For this thickness, we set the Yee cell size to 21 nm and the time step Δt = 0.039 fs so as to satisfy the Courant stability condition. Regarding holes of the photonic crystal slab, various complicated shapes and/or lattices have been studied to date [6]- [12]. However, it is the easiest to achieve an accurate shape with circular holes, and the requirement for the inter-hole spacing is the most relaxed for a triangle lattice.…”

Section: Calculation and Designmentioning

confidence: 99%

“…The LD slow light arises from partial distortion of the photonic band of the main waveguide mode, which is induced by local modulations of hole diameters and/or lattice points in a photonic crystal slab [6]- [12] We have studied both types of modulations and mostly employed the latter for easier fabrication, calling it a lattice-shifted photonic crystal waveguide (LSPCW). In particular, we have employed the shift of the third rows along the line defect, because this shift produces a band distortion with a small shift in wavelengths of slow light.…”

Section: Introductionmentioning

confidence: 99%

Silica-Clad Silicon Photonic Crystal Waveguides for Wideband Dispersion–Free Slow Light

Tamura

Kondo

Terada

et al. 2015

J. Lightwave Technol.

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We comprehensively calculated the photonic bands of the waveguide modes in practical lattice-shifted photonic crystal waveguides, which are completely cladded by silica. We assumed various lattice shifts and found that the shift of the second rows and the mixed shift of the first and third rows along the waveguide generate low-dispersion slow light with group indices of 34 -36, which is higher than those with a conventional shift of the third rows, maintaining a wide bandwidth over 10 nm at telecom wavelengths. We fabricated the waveguides using a CMOS-compatible process and confirmed correspondence with the calculation results. We also compared 25-Gbps photonic crystal slow light Mach−Zehnder modulators and confirmed the improvement of the modulation efficiency by second-row shifts.

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“…Slow light with a much slower group velocity makes it possible to delay and temporarily store light in all-optical systems [3][4][5][6]. Among all the approaches to realize slow light, photonic crystal waveguide (PCW) has drawn much attention as it supports room temperature operation and is compatible with on-chip integration [7][8][9][10][11][12][13][14][15][16]. However, the performance of the conventional photonic crystal (PC) systems is very vulnerable to the backscattering loss induced by disorders or defects [17,18].…”

Section: Introductionmentioning

confidence: 99%

Unidirectional Slow Light Transmission in Heterostructure Photonic Crystal Waveguide

Zhang

2018

Applied Sciences

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In conventional photonic crystal systems, extrinsic scattering resulting from random manufacturing defects or environmental changes is a major source of loss that causes performance degradation, and the backscattering loss is amplified as the group velocity slows down. In order to overcome the limitations in slow light systems, we propose a backscattering-immune slow light waveguide design. The waveguide is based on an interface between a square lattice of magneto-optical photonic crystal with precisely tailored rod radii of the first two rows and a titled 45 degrees square lattice of Alumina photonic crystal with an aligned band gap. High group indices of 77, 68, 64, and 60 with the normalized frequency bandwidths of 0.444%, 0.481%, 0.485%, and 0.491% are obtained, respectively. The corresponding normalized delay-bandwidth products remain around 0.32 for all cases, which are higher than previously reported works based on rod radius adjustment. The robustness for the edge modes against different types of interfacial defects is observed for the lack of backward propagation modes at the same frequencies as the unidirectional edge modes. Furthermore, the transmission direction can be controlled by the sign of the externally applied magnetic field normal to the plane.

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Wideband and Low Dispersion Slow Light in Lattice-Shifted Photonic Crystal Waveguides

Cited by 20 publications

References 25 publications

Tunable Slow Light with Large Bandwidth and Low-dispersion in Photonic Crystal Waveguide Infiltrated with Magnetic Fluids

Tunable Slow Light with Large Bandwidth and Low-dispersion in Photonic Crystal Waveguide Infiltrated with Magnetic Fluids

Silica-Clad Silicon Photonic Crystal Waveguides for Wideband Dispersion–Free Slow Light

Unidirectional Slow Light Transmission in Heterostructure Photonic Crystal Waveguide

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