Tunable gallium nitride-based devices for ultrafast signal processing

2019 ◽  
Vol 33 (17) ◽  
pp. 1950187 ◽  
Author(s):  
Peng Xie ◽  
Yu Wen ◽  
Wenqiang Yang ◽  
Zishen Wan ◽  
Jiarui Liu ◽  
...  
Keyword(s):  
Signal Processing ◽  
Gallium Nitride ◽  
Nonlinear Optics ◽  
Optical Communications ◽  
Pulse Compression ◽  
Ring Resonator ◽  
Wavelength Conversion ◽  
Geometric Dimension ◽  
Potential Applications ◽  
Resonator Model

In this paper, we propose a micro-ring resonator model based on gallium nitride (GaN) and graphene, which exhibits tunable properties of nonlinearity. It provides a great bandwidth covering from visible to telecommunication band. Especially, based on the characteristic of GaN, it has unique advantages in shorter wavelength, which is used for demonstrating the ultrafast signal processing including wavelength conversion, temporal amplification and pulse compression. Moreover, the tunable signal processing is achieved via the method of applying additional bias voltage to graphene without changing the geometric dimension of the device. These results have significant potential applications of nonlinear optics and optical communications.

Tunable wavelength conversion based on a nanoscale slot waveguide in communication bands

2020 ◽  
Vol 34 (25) ◽  
pp. 2050260
Author(s):  
Rujing Guo ◽  
Mengxiong Han ◽  
Peiqi Wei ◽  
Shenwei Yin ◽  
Yan Ma
Keyword(s):  
Signal Processing ◽  
Near Infrared ◽  
Wavelength Conversion ◽  
Processing System ◽  
Geometric Dimension ◽  
Pulse Generation ◽  
Complex Signal ◽  
Slot Waveguide ◽  
Signal Processing System ◽  
Tunable Wavelength

This paper introduces a new nanoscale slot waveguide using organic material, graphene, and silicon-based materials. The physical mechanism of additional biased voltage can improve the performance of graphene-related waveguide, the proposed waveguide exhibits tunable performance including effective refractive index and dispersion without changing its structure and geometric dimension, which contributes to the practical value in future complex signal processing system. Based on the waveguide, wavelength conversion based on four-wave mixing is theoretically investigated in the near-infrared region and the tunable wavelength conversion is realized. These research results will have potential in the fields of data transmission and optical communications and help researchers deeply understand the physical mechanisms and nonlinear effects about the optical pulse generation processes and signal processing.

scholarly journals Supramolecular Nanofibers from Collagen-Mimetic Peptides Bearing Various Aromatic Groups at N-Termini via Hierarchical Self-Assembly

2021 ◽  
Vol 22 (9) ◽  
pp. 4533
Author(s):  
Tomoyuki Koga ◽  
Shinya Kingetsu ◽  
Nobuyuki Higashi
Keyword(s):  
Self Assembly ◽  
Triple Helix ◽  
Wavelength Conversion ◽  
Nile Red ◽  
Tem Analysis ◽  
Mimetic Peptides ◽  
Collagen Mimetic Peptides ◽  
Potential Applications ◽  
Hydrophobic Molecule ◽  
Emission Behavior

Self-assembly of artificial peptides has been widely studied for constructing nanostructured materials, with numerous potential applications in the nanobiotechnology field. Herein, we report the synthesis and hierarchical self-assembly of collagen-mimetic peptides (CMPs) bearing various aromatic groups at the N-termini, including 2-naphthyl, 1-naphtyl, anthracenyl, and pyrenyl groups, into nanofibers. The CMPs (R-(GPO)n: n > 4) formed a triple helix structure in water at 4 °C, as confirmed via CD analyses, and their conformations were more stable with increasing hydrophobicity of the terminal aromatic group and peptide chain length. The resulting pre-organized triple helical CMPs showed diverse self-assembly into highly ordered nanofibers, reflecting their slight differences in hydrophobic/hydrophilic balance and configuration of aromatic templates. TEM analysis demonstrated that 2Np-CMPn (n = 6 and 7) and Py-CMP6 provided well-developed natural collagen-like nanofibers and An-CMPn (n = 5–7) self-assembled into rod-like micelle fibers. On the other hand, 2Np-CMP5 and 1Np-CMP6 were unable to form nanofibers under the same conditions. Furthermore, the Py-CMP6 nanofiber was found to encapsulate a guest hydrophobic molecule, Nile red, and exhibited unique emission behavior based on the specific nanostructure. In addition to the ability of CMPs to bind small molecules, their controlled self-assembly enables their versatile utilization in drug delivery and wavelength-conversion nanomaterials.

Multi-Channel Cascadable Parametric Signal Processing for Wavelength Conversion and Nonlinearity Compensation

2017 ◽  
Vol 35 (4) ◽  
pp. 815-823 ◽  
Author(s):  
Shu Namiki ◽  
Karen Solis-Trapala ◽  
Hung Nguyen Tan ◽  
Mark Pelusi ◽  
Takashi Inoue
Keyword(s):  
Signal Processing ◽  
Wavelength Conversion ◽  
Nonlinearity Compensation

A New Radar Signal Processing Architecture Based on Multi-Core Processor

2014 ◽  
Vol 556-562 ◽  
pp. 1618-1621
Author(s):  
Jia Liang Fan ◽  
Qiang Yang
Keyword(s):  
Signal Processing ◽  
Pulse Compression ◽  
Adaptive Beamforming ◽  
System Structure ◽  
Radar Signal ◽  
Radar Signal Processing ◽  
Test Results ◽  
Radar Systems ◽  
Multi Core Processor ◽  
Processing Architecture

Most radar systems based on the structure that contains many DSP chips. The system structure is always complex, and it is difficult to update. Nowadays, multi-core processor develops very fast. Compared with DSP chips, multi-core processor has better performance in signal processing field. In this paper, we present a signal processing architecture which based on multi-core processor. Pulse compression algorithms and PCI-E bus are discussed as two important technologies. Adaptive beamforming test results show that multi-core processor is able to achieve radar signal processing.

scholarly journals Effect of Input Amplitude to Power Amplification in Various Orientation of Ring Resonator

2016 ◽  
Vol 1 (1) ◽  
Author(s):  
Haryana Mohd Hairi
Keyword(s):  
Ring Resonator ◽  
Simulation Software ◽  
Ring Resonators ◽  
Input Amplitude ◽  
Power Amplification ◽  
Optical Circuit ◽  
Potential Applications ◽  
Wavelength Filter ◽  
Waveguide Resonators ◽  
Wavelength Filtering

<p>Photonic ring waveguide resonators have great potential applications in wavelength filtering, switching, modulation and multiplexing.  The response of coupled ring resonators can be designed by using various coupling configurations. Particularly, ring resonators can be used as wavelength filter when the wavelength fits a whole multiple times in the circumference of the ring.  In this paper, we investigate the effect of input amplitude to power amplification in four ring resonator configurations and vary the input amplitude on five different wavelengths.  With OptiFDTD Photonics Simulation Software V8.0, the results show the intensity phenomenon of filtering in optical circuit.</p><p> </p>

scholarly journals Photonic RF channelizer based on 49GHz soliton crystal microcombs

2020 ◽  
Author(s):  
David Moss ◽  
Roberto Morandotti ◽  
Arnan Mitchell ◽  
xingyuan xu ◽  
mengxi tan ◽  
...  
Keyword(s):  
Signal Processing ◽  
High Resolution ◽  
Ring Resonator ◽  
Rf Receivers ◽  
High Q ◽  
Monolithically Integrated ◽  
Broadband Radio ◽  
Significant Step ◽  
Multi Wavelength ◽  
Reduced Complexity

We report a broadband radio frequency (RF) channelizer with up to 92 channels using a coherent microcomb source. A soliton crystal microcomb, generated by a 49 GHz micro-ring resonator (MRR), is used as a multi-wavelength source. Due to its ultra-low comb spacing, up to 92 wavelengths are available in the C band, yielding a broad operation bandwidth. Another high-Q MRR is employed as a passive optical periodic filter to slice the RF spectrum with a high resolution of 121.4 MHz. We experimentally achieve an instantaneous RF operation bandwidth of 8.08 GHz and verify RF channelization up to 17.55 GHz via thermal tuning. Our approach is a significant step towards the monolithically integrated photonic RF receivers with reduced complexity, size, and unprecedented performance, which is important for wide RF applications ranging from broadband analog signal processing to digital-compatible signal detection.

MoS2-wrapped microfiber-based multi-wavelength soliton fiber laser

2017 ◽  
Vol 31 (32) ◽  
pp. 1750303 ◽  
Author(s):  
Feifei Lu
Keyword(s):  
Pump Power ◽  
Fiber Laser ◽  
Saturable Absorber ◽  
Optical Communications ◽  
Fiber Lasers ◽  
Tunable Filter ◽  
Linear Birefringence ◽  
Erbium Doped ◽  
Potential Applications ◽  
Multi Wavelength

The single-, dual- and triple-wavelength passively mode-locked erbium-doped fiber lasers are demonstrated with MoS2 and polarization-dependent isolator (PD-ISO). The saturable absorber is fabricated by wrapping an MoS2 around a microfiber. The intracavity PD-ISO acts as a wavelength-tunable filter with a polarization controller (PC) by adjusting the linear birefringence. Single-wavelength mode-locked fiber laser can self-start with suitable pump power. With appropriate PC state, dual- and triple-wavelength operations can be observed when gains at different wavelengths reach a balance. It is noteworthy that dual-wavelength pulses exhibiting peak and dip sidebands, respectively, are demonstrated in the experiment. The proposed simple and multi-wavelength all-fiber conventional soliton lasers could possess potential applications in numerous fields, such as sensors, THz generations and optical communications.

Digital Signal Processing for Short-Reach Optical Communications: A Review of Current Technologies and Future Trends

2018 ◽  
Vol 36 (2) ◽  
pp. 377-400 ◽  
Author(s):  
Kangping Zhong ◽  
Xian Zhou ◽  
Jiahao Huo ◽  
Changyuan Yu ◽  
Chao Lu ◽  
...  
Keyword(s):  
Signal Processing ◽  
Digital Signal Processing ◽  
Optical Communications ◽  
Digital Signal ◽  
Future Trends
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