Analog Signal Transmission in a High-Contrast-Gratings-Based Hollow-Core-Waveguide

Huang, Hao; Yue, Yang; Zhang, L.; Chase, Chris; Parekh, Devang; Sedgwick, Forrest G.; Wu, M.C.; Chang-Hasnain, Connie J.; Tur, Moshe; Willner, Alan E.

doi:10.1109/jlt.2012.2224844

Cited by 9 publications

(5 citation statements)

References 17 publications

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“…In the proposed device the optimization of grating period ( ) is done to achieve high reflectivity ∼99%, so that there is strong optical confinement inside the air core of thickness 0.8μm with low loss of 0.2dB/cm calculated using equation (1) at the center wavelength of 1.55μm. Undoubtedly a narrow air core is best suited for slowing down the light, but propagation loss remains a major issue.…”

Section: Slow Light Characteristicsmentioning

confidence: 99%

“…On chip versions of hollow waveguide are promising for integrated photonics. Hollow core waveguides have found numerous applications in sensing, dispersion compensation in fiber optic links, tunable filters, spot size converters and Bragg reflectors [1]- [6]. Hollow-core waveguides offer inherent advantages of low nonlinearity, high thermal stability, wide tuning and low loss with strong optical confinement.…”

Section: Introductionmentioning

confidence: 99%

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Slow Light Enhanced Phase Shifter Based on Low-Loss Silicon-ITO Hollow Waveguide

et al. 2019

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An optical phase shifter based on narrow-core hollow waveguide is proposed. The light is guided in an air core between the top and bottom reflectors made up of silicon and indium tin oxide (ITO) gratings. The proposed narrow-core hollow structure is able to guide slow light mode with a low loss of 0.2 dB/cm and a high group index of 64 in 0.8 μm thick air core. The presence of ITO enables electrically controlled phase shifting. In order to realize phase shifting, a p-in junction in ITO is used around the air core and in the top and bottom gratings. The geometry is optimized for enhanced interaction between the free charge carriers injected in the intrinsic region of ITO and the propagating optical mode. The proposed device shows a phase shifting of 180°for a 71-μm long device resulting from the slow-light effect.

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Section: Slow Light Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Slow Light Enhanced Phase Shifter Based on Low-Loss Silicon-ITO Hollow Waveguide

et al. 2019

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“…For an analog optical link, linearity is one of the key performance metrics. Traditionally, there are mainly three methods to increase the linearity of analog signal transmission in various systems: (1) improving the driving/bias schemes or optical structures of the modulators to construct linear or quasi-linear modulators [71][72][73][74]; (2) using a tunable filter with proper center wavelength and bandwidth to remove the unwanted optical carrier and thus rise the linearity of analog links [75,76]; (3) using Chip-Scale Microwave Photonic Signal Processing http://dx.doi.org/10.5772/66322 optical waveguides with extremely low nonlinearity, low-loss and high thermal stability for signal transmission [77]. Integrated silicon photonic devices such as silicon waveguides, MRR, microdisk resonators, and PhC cavities have promoted the evolution of on-chip MWP signal processing functions due to the high nonlinear effects of waveguides and diverse filtering properties of resonators.…”

Section: On-chip Analog Signal Transmissionmentioning

confidence: 99%

Chip-Scale Microwave Photonic Signal Processing

Wang¹,

Long²

2017

Microwave Systems and Applications

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The use of optical technology can provide unprecedented performance to the generation, distribution, and processing of microwave. Recently, on-chip microwave photonics (MWP) has gained significant interests for its numerous advantages, such as robustness, reconfigurability as well as reduction of size, weight, cost, and power consumption. In this chapter, we review our recent progress in ultracompact microwave photonic signal processing using silicon nanophotonic devices. Using the fabricated silicon waveguide, silicon microring resonators (MRRs) and silicon photonic crystal nanocavities, we demonstrate on-chip analog signal transmission, optically controlled tunable MWP filter, and ultrahigh peak rejection notch MWP filter. The performance of analog links and the responses of MWP filters are evaluated in the experiment. In addition, microwave signal multiplication and modulation are also demonstrated based on a silicon Mach-Zehnder modulator in the experiment with favorable operation performance. The demonstrated on-chip analog links, MWP filters, microwave signal multiplication/modulation may help understand onchip analog signaling and expand novel functionalities of MWP signal processing.

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“…4 In addition, their well-established theoretical descriptions also contribute to the enabling of benefiting from HCGs for the purpose of designing various optical devices, i.e., polarization-independent broadband reflectors, 5 polarizing beam splitters, 6 saturable and cavity-enhanced absorbers, 7,8 monolithic high-reflectivity cavity mirrors, 9 planar lenses and reflectors with high focusing abilities, 10,11 high quality-factor Fabry-Perot resonators, 12 vertical-cavity surface emitting and nanoelectromechanical lasers, 13,14 slow light waveguides, 15 and one-, twoand three-dimensional hollow-core low-loss optical waveguides. [16][17][18] In this study, we benefit from the unique properties of HCGs for the purpose of achieving the desired transmission characteristics of a broadband and highly efficient quarter-wave plate, which operates in the nearinfrared regime. It has recently been shown that transmission characteristics of binary and vertical HCGs can be obtained by the implementation of the periodic dielectric slab waveguide interpretation.…”

Section: Introductionmentioning

confidence: 99%

Broadband quarter-wave plates at near-infrared using high-contrast gratings

et al. 2013

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In this paper, we report the theoretical and experimental possibility of achieving a quarter-wave plate regime by using high-contrast gratings, which are binary, vertical, periodic, near-wavelength, and two-dimensional high refractive index gratings. Here, we investigate the characteristics of two distinct designs, the first one being composed of silicon-dioxide and silicon, and the second one being composed of silicon and sapphire. The suggested quarter-wave plate regime is achieved by the simultaneous optimization of the transverse electric and transverse magnetic transmission coefficients, TTE and TTM, respectively, and the phase difference between these transmission coefficients, such that |TTM| ≅ |TTE| and \TTM - \TTE ≅ -/2. As a result, a unity circular polarization conversion efficiency is achieved atλ0 = 1.55 μm for both designs. For the first design, we show the obtaining of unity conversion efficiency by using a theoretical approach, which is inspired by the periodic waveguide interpretation, and rigorous coupled-wave analysis (RCWA). For the second design, we demonstrate the unity conversion efficiency by using the results of finite-difference time-domain (FDTD) simulations. Furthermore, the FDTD simulations, where material dispersion is taken into account, suggest that an operation percent bandwidth of 51% can be achieved for the first design, where the experimental results for the second design yield a bandwidth of 33%. In this context, we define the operation regime as the wavelength band for which the circular conversion efficiency is larger than 0.9. © 2013 SPIE

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Analog Signal Transmission in a High-Contrast-Gratings-Based Hollow-Core-Waveguide

Cited by 9 publications

References 17 publications

Slow Light Enhanced Phase Shifter Based on Low-Loss Silicon-ITO Hollow Waveguide

Slow Light Enhanced Phase Shifter Based on Low-Loss Silicon-ITO Hollow Waveguide

Chip-Scale Microwave Photonic Signal Processing

Broadband quarter-wave plates at near-infrared using high-contrast gratings

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