Characterization and compensation of apodization phase noise in silicon integrated Bragg gratings

Cheng, Rui; Han, Ya; Chrostowski, Lukas

doi:10.1364/oe.27.009516

Cited by 10 publications

(11 citation statements)

References 33 publications

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“…Furthermore, since an apodisation scheme based on variation of the grating sidewall amplitude was employed, residual ripples in the grating reflectivity and group delay spectra are still apparent. Grating coupling coefficient apodisation schemes that more effectively reduce the spectral ripple of the device, and can be fabricated within nanometric tolerances, have recently been demonstrated using phase based methods [10,16].…”

Section: Resultsmentioning

confidence: 99%

“…They are applied in a large variety of applications, including, optical filtering [1,2], sensing [3], laser cavity feedback [4] and all-optical signal processing [5,6]. A wide range of device geometries have been demonstrated in order to exercise control over the grating optical characteristics, namely the filter bandwidth [7], ripple [8], extinction and dispersion [2,9,10]. In turn, the optical characteristics of the grating can be designed through the coupling coefficient, κ, and the grating Bragg wavelength, λB, as a function of the propagation length [10,11].…”

Section: Introductionmentioning

confidence: 99%

“…A wide range of device geometries have been demonstrated in order to exercise control over the grating optical characteristics, namely the filter bandwidth [7], ripple [8], extinction and dispersion [2,9,10]. In turn, the optical characteristics of the grating can be designed through the coupling coefficient, κ, and the grating Bragg wavelength, λB, as a function of the propagation length [10,11]. Active control of Bragg grating devices has also been demonstrated using multi-section p-n junction elements to create tunable notch features in the device stopband [12].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, by simply varying the grating period [14], or effective waveguide index, devices can be created with linear and higher order dispersion profiles [9] or even complex multi-band filter designs [15]. Filter ripple effects have been effectively minimised by suitably apodising the grating κ along its length [9,10,16]. The dispersion profile of a grating device is generally defined during the fabrication procedure as a modulation of the period [14] or effective index [17].…”

Section: Introductionmentioning

confidence: 99%

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Active On-Chip Dispersion Control Using a Tunable Silicon Bragg Grating

2019

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Actively controllable dispersion in on-chip photonic devices is challenging to implement compared with free space optical components where mechanical degrees of freedom can be employed. Here, we present a method by which continuously tunable group delay control is achieved by modulating the refractive index profile of a silicon Bragg grating using thermo-optic effects. A simple thermal heater element is used to create tunable thermal gradients along the grating length, inducing chirped group delay profiles. Both effective blue and red chirp are realised using a single on-chip device over nanometre scale bandwidths. Group delay slopes are continuously tunable over a few ps/nm range from red to blue chirp, compatible with on-chip dispersion compensation for telecommunications picosecond pulse systems.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Active On-Chip Dispersion Control Using a Tunable Silicon Bragg Grating

2019

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“…For this, we first model the waveguide-effective indices as a function of wavelength and waveguide width using a commercial mode solver (Lumerical MODE). Then, we create a waveguide width profile w ( z ) along the optical axis and map this into a dispersive effective index profile n eff (z,λ) = n eff (λ) + d n ( z ) + i * k , where n eff (λ) accounts for the waveguide dispersion, d n ( z ) accounts for the sidewall modulation (empirically scaled down by 2.3 for the best agreement between our 1D approximation and real 3D nanowires as in ref ), and the imaginary component k accounts for the nominal propagation loss (∼2.5 dB/cm) of a standard nanowire. This is performed for both type-A and type-B structures.…”

Section: Methodsmentioning

confidence: 99%

Moiré Effects in Silicon Photonic Nanowires

2022

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Photonic moiré lattices offer an attractive platform for manipulating the flow and confinement of light from remarkably simple device geometries. This emerging field draws inspiration from the rapid research progress observed in twisted bilayer van der Waals materials or “twistronics,” instead of applying moiré physics to photon propagation in wavelength-scale optical media. However, to date, only a limited number of experimental studies have been performed in this area, and there is strong interest in understanding how moiré effects can be tailored in compact and scalable optical technologies such as an integrated photonics platform. In this work, we map the moiré effects of one-dimensional (1D) photonic moiré lattices composed of width-modulated silicon nanowires, including the construction of a 1D experiment analogous to the twisting of a two-dimensional (2D) lattice. Although the twist angle Δθ and/or lattice mismatch ΔΛ are the sole defining parameters for infinite moiré crystals, we demonstrate how the crystal size, symmetry, and moiré fringe phase Δϕ also serve as important degrees of freedom. Through tailoring these parameters, we map a wide range of behaviors including the formation of moiré photonic crystal cavities, the onset of miniband formation and operation as a coupled resonator optical waveguide (CROW), widely tunable Q-factors and group velocities, suppression of grating sidebands, and persistent vs extinguishable tunneling. These results provide insight into the moiré physics of 1D optical systems and highlight various operating regimes relevant to the design of finite photonic moiré lattices and devices.

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Observation of Aulter–Townes splitting in subwavelength grating metamaterial ring resonators

et al. 2023

APL Photonics

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Subwavelength grating metamaterial (SGM) waveguide is typically treated as a homogeneous medium without considering the intra-waveguide reflection. However, this approximation is not always valid, especially in resonators. Inthis paper, we show that the reflection induced mutual coupling between the clock-wise (CW) and counter clock- wise(CCW) resonant modes in subwavelength grating metamaterial waveguide ring resonator (SGMRR) breaks the degeneracy of the two modes, leading to the formation of Autler-Townes splitting (ATS). This phenomenon could beleveraged to improve the detection limit of SGMRR based sensors.

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Characterization and compensation of apodization phase noise in silicon integrated Bragg gratings

Cited by 10 publications

References 33 publications

Active On-Chip Dispersion Control Using a Tunable Silicon Bragg Grating

Active On-Chip Dispersion Control Using a Tunable Silicon Bragg Grating

Moiré Effects in Silicon Photonic Nanowires

Observation of Aulter–Townes splitting in subwavelength grating metamaterial ring resonators

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