Five-Line Photonic Crystal Waveguide for Optical Buffering and Data Interconnection of Picosecond Pulse

Elshahat, Sayed; Abood, Israa; Khan, K.; Yadav, Ashish; Bibbò, Luigi; Ouyang, Zhengbiao

doi:10.1109/jlt.2018.2881121

Cited by 29 publications

(20 citation statements)

References 83 publications

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“…Based on the PWE method, which deals with infinite structure area, a longer delay-line length L is taken as 1 mm by cascading the unit cell structure shown in Figure 1 b and Figure 2 b, which is much longer than the wavelength. So, our calculations are applicable [ 17 ]. The operating bandwidth was calculated for within ±10% variation of

as the operating wavelength changes.…”

Section: Structure Geometry and Simulation Resultsmentioning

confidence: 99%

“…So, the loss of PhCs could be a factor to be considered in their applications. Fortunately, due to the small size of optical integrated chips, the material loss can be ignored for available materials and, further, the structure losses can be reduced or eliminated through carefully designing the dispersion of the waveguides, explained in detail at [ 17 , 33 , 34 , 35 ]. Therefore, PhCs have great potential for information and communication technologies, including 6G wireless communication [ 31 ].…”

Section: Structure Geometry and Simulation Resultsmentioning

confidence: 99%

“…The third is the normalized delay bandwidth product (NDBP), which is the most important parameter for slow-light performance. It can be calculated as the multiplication of the average group index

per frequency range, where

is restricted by over ±10% variation of group index [ 16 , 17 ] and the bandwidth ratio

[ 18 ]:

where

and

are the bandwidth and central frequency, respectively;

and

are the normalized bandwidth and normalized central frequency, respectively. NDBP is an indispensable quantity in representing the slow-light performance and more often used when the devices have different lengths and/or operating frequencies [ 19 , 20 , 21 , 22 ].…”

Section: Theoretical Characteristicsmentioning

confidence: 99%

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High Figure of Merit Optical Buffering in Coupled-Slot Slab Photonic Crystal Waveguide with Ionic Liquid

2020

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Slow light with adequate low group velocity and wide bandwidth with a flat band of the zero-dispersion area were investigated. High buffering capabilities were obtained in a silicon-polymer coupled-slot slab photonic crystal waveguide (SP-CS-SPCW) with infiltrating slots by ionic liquid. A figure of merit (FoM) around 0.663 with the lowest physical bit length Lbit of 4.6748 µm for each stored bit in the optical communication waveband was gained by appropriately modifying the square air slot length. Posteriorly, by filling the slots with ionic liquid, the Lbit was enhanced to be 4.2817 μm with the highest FoM of 0.72402 in wider transmission bandwidth and ultra-high bit rate in terabit range, which may become useful for the future 6G mobile communication network. Ionic liquids have had a noticeable effect in altering the optical properties of photonic crystals. A polymer was used for the future incorporation of an electro-optic effect in buffers to realize the dynamic controlling of optical properties. Ionic liquids enhanced the transmission rate through optical materials. Additionally, the delay time in the ns-range was achieved, providing longer delay and ultra-low group velocity, which is important for light-matter interaction in light amplifiers and nonlinear devices.

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as the operating wavelength changes.…”

Section: Structure Geometry and Simulation Resultsmentioning

confidence: 99%

Section: Structure Geometry and Simulation Resultsmentioning

confidence: 99%

per frequency range, where

is restricted by over ±10% variation of group index [ 16 , 17 ] and the bandwidth ratio

[ 18 ]:

where

and

are the bandwidth and central frequency, respectively;

and

Section: Theoretical Characteristicsmentioning

confidence: 99%

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High Figure of Merit Optical Buffering in Coupled-Slot Slab Photonic Crystal Waveguide with Ionic Liquid

2020

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“…Fortunately, it was demonstrated that 2-D calculations of PhC structures with the effective refractive index

with infinite height is a good approximation for 3-D structures, which is frequently treated by researchers and appropriated experimentally [ 23 , 43 ]. The 2-D calculations are generally applied with

[ 16 , 43 , 44 , 45 , 46 ] in place of slab bulk refractive index. Figure 7 compares the group velocity

for TM guided-mode via the normalized frequency

for 2-D calculations with

approximation and

for the optimum case of the proposed EPCW at

.…”

Section: Dynamic Modulation and Electro-optical Sensormentioning

confidence: 99%

Elongated-Hexagonal Photonic Crystal for Buffering, Sensing, and Modulation

et al. 2021

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A paradigm for high buffering performance with an essential fulfillment for sensing and modulation was set forth. Through substituting the fundamental two rows of air holes in an elongated hexagonal photonic crystal (E-PhC) by one row of the triangular gaps, the EPCW is molded to form an irregular waveguide. By properly adjusting the triangle dimension solitary, we fulfilled the lowest favorable value of the physical-size of each stored bit by about μ5.5510 μm. Besides, the EPCW is highly sensitive to refractive index (RI) perturbation attributed to the medium through infiltrating the triangular gaps inside the EPCW by microfluid with high RI sensitivity of about 379.87 nm/RIU. Furthermore, dynamic modulation can be achieved by applying external voltage and high electro-optical (EO) sensitivity is obtained of about 748.407 nm/RIU. The higher sensitivity is attributable to strong optical confinement in the waveguide region and enhanced light-matter interaction in the region of the microfluid triangular gaps inside the EPCW and conventional gaps (air holes). The EPCW structure enhances the interaction between the light and the sensing medium.

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“…at room temperature with wide bandwidths [3] and possess low dispersion and distortion for light propagation [4]. With technologically valuable developmentsof silicon-based PCWs, slotted photonic crystal waveguide (SPCW)attracted the attention of many researchersdue to the combination of two important features in numerous applications: it can merge the abilities to confine light in the low-index material in slots and enhancing the slow-light property of PCWs [5].…”

Section: Introductionmentioning

confidence: 99%

Sporadic-Slot Photonic-Crystal Waveguide for All-Optical Buffers With Low-Dispersion, Distortion, and Insertion Loss

et al. 2020

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A novel structure is studied with implanting sporadic slots inside a photonic crystal waveguide (PCW) to form sporadic-slot PCW (SSPCW) for realizing compact, all-optical buffers with lowdispersion, distortion, and attenuation (DDA). We implement the first demonstration that, to the best of our knowledge, the SSPCW works for both TE-and TM-modes all-optical buffers and slow-light waveguides. High buffer performance and wider transmission bandwidth in telecommunication band are obtained, which are guaranteed through bit rate optimization that exceeded 2 Tb/s for both TE and TM modes in ultra-low dispersion region which is 20 times greater than that required for 5G mobile communications and it is also useful for all-optical signal processing. The storage length of 1 bit is obtained as 4.5202 µm for TE mode and 6.0525 µm for TM mode. Moreover, a low relative pulse distortion of 0.0801% µm −1 along the propagation path per unit length is acquired for a 0.63 ps pulse. Besides, the attenuation coefficient of the optical power pulse between the input and output is 0.0170 dB/µm. Additionally, the deigned SSPCW is insensitive for small variations of waveguide parameters and the deviation is virtually negligible between the simulated results and that of the fabricated structures with totally acceptable tolerance below ±3 nm, which is the challenge in the fabrication process of conventional PCW and PCW-cavity.

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Five-Line Photonic Crystal Waveguide for Optical Buffering and Data Interconnection of Picosecond Pulse

Cited by 29 publications

References 83 publications

High Figure of Merit Optical Buffering in Coupled-Slot Slab Photonic Crystal Waveguide with Ionic Liquid

High Figure of Merit Optical Buffering in Coupled-Slot Slab Photonic Crystal Waveguide with Ionic Liquid

Elongated-Hexagonal Photonic Crystal for Buffering, Sensing, and Modulation

Sporadic-Slot Photonic-Crystal Waveguide for All-Optical Buffers With Low-Dispersion, Distortion, and Insertion Loss

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