scholarly journals A Three Demultiplexer C-Band Using Angled Multimode Interference in GaN–SiO2 Slot Waveguide Structures

Nanomaterials ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 2338
Author(s):  
Eduard Ioudashkin ◽  
Dror Malka
Keyword(s):  
Wavelength Division Multiplexing ◽  
Light Propagation ◽  
Infrared Light ◽  
Multimode Interference ◽  
Slot Waveguide ◽  
Telecommunication System ◽  
Field Mode ◽  
Waveguide Coupler ◽  
Wavelength Division ◽  
Large Bandwidth

One of the most common techniques for increasing data bitrate using the telecommunication system is to use dense wavelength division multiplexing (DWDM). However, the implementation of DWDM with more channels requires additional waveguide coupler devices and greater energy consumption, which can limit the system performances. To solve these issues, we propose a new approach for designing the demultiplexer using angled multimode interference (AMMI) in gallium nitride (GaN)–silica (SiO2) slot waveguide structures. SiO2 and GaN materials are selected for confining the infrared light inside the GaN areas under the transverse electric (TE) field mode. The results show that, after 3.56 mm light propagation, three infrared wavelengths in the C-band can be demultiplexed using a single AMMI coupler with a power loss of 1.31 to 2.44 dB, large bandwidth of 12 to 13.69 nm, very low power back reflection of 47.64 to 48.76 dB, and crosstalk of −12.67 to −15.62 dB. Thus, the proposed design has the potential for improving performances in the telecommunication system that works with DWDM technology.

scholarly journals An Eight-Channel C-Band Demux Based on Multicore Photonic Crystal Fiber

Nanomaterials ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 845 ◽  
Author(s):  
Dror Malka ◽  
Gilad Katz
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Wavelength Division Multiplexing ◽  
Light Propagation ◽  
Beam Propagation Method ◽  
Geometrical Parameters ◽  
Wavelength Division ◽  
Crystal Fiber ◽  
Large Bandwidth ◽  
Air Hole

A novel eight-channel demux device based on multicore photonic crystal fiber (PCF) structures that operate in the C-band range (1530–1565 nm) has been demonstrated. The PCF demux design is based on replacing some air-hole areas with lithium niobate and silicon nitride materials over the PCF axis alongside with the appropriate optimizations of the PCF structure. The beam propagation method (BPM) combined with Matlab codes was used to model the demux device and optimize the geometrical parameters of the PCF structure. The simulation results showed that the eight-channel demux can be demultiplexing after light propagation of 5 cm with a large bandwidth (4.03–4.69 nm) and cross-talk (−16.88 to −15.93 dB). Thus, the proposed device has great potential to be integrated into dense wavelength division multiplexing (DWDM) technology for increasing performances in networking systems.

scholarly journals An 8-Channel C-Band Demux Based on Multicore Photonic Crystal Fiber

2018 ◽  
Author(s):  
Dror Malka ◽  
Gilad Katz
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Wavelength Division Multiplexing ◽  
Light Propagation ◽  
Beam Propagation Method ◽  
Geometrical Parameters ◽  
Wavelength Division ◽  
Crystal Fiber ◽  
Large Bandwidth ◽  
Structure Simulation

A novel 8-channel demux device based on multicore photonic crystal fiber (PCF) structures that operate at C-band range (1530-1565nm) has been demonstrated. The PCF demux design is based on replacing some air-holes areas with lithium niobate and silicon nitride materials over the PCF axis alongside with the appropriate optimizations of the PCF structure. The beam propagation method (BPM) combined with Matlab codes were used to modeled the demux device and to optimized the geometrical parameters of the PCF structure. Simulation results show that 8-channel can be demultiplexing after light propagation of 5 cm with large bandwidth (4.03-4.69nm) and crosstalk ((-16.88)-(-15.93) dB). Thus, the proposed device has a great potential to be integrated in dense wavelength division multiplexing (DWDM) technology for increasing performances in networking systems.

scholarly journals Tunable Channel Drop Filter in a Two-Dimensional Photonic Crystal Modulated by a Nematic Liquid Crystal

2006 ◽  
Vol 2006 ◽  
pp. 1-6 ◽  
Author(s):  
Chen-Yang Liu ◽  
Lien-Wen Chen
Keyword(s):  
Liquid Crystals ◽  
Integrated Circuits ◽  
Wavelength Division Multiplexing ◽  
Light Propagation ◽  
Nematic Liquid Crystals ◽  
Fdtd Method ◽  
Wavelength Division ◽  
Resonance Frequencies ◽  
Potential Applications ◽  
Control Light

Photonic crystals (PCs) have many potential applications because of their ability to control light-wave propagation and because PC-based waveguides may be integrated into optical circuits. We propose a novel tunable PC channel drop filter based on nematic liquid crystals and investigate its properties numerically by using the finite-difference time-domain (FDTD) method. The refractive indices of liquid crystals can be actively modulated after infiltrating nematic liquid crystals into the microcavity in PC waveguides with square lattices. Then we can control light propagation in a PC waveguide. We analyze theQ-factors and resonance frequencies of a tunable PC channel drop filter by considering various indices modulation of liquid crystals. The novel component can be used as wavelength division multiplexing in photonic integrated circuits.

scholarly journals Исследование статических и динамических характеристик сплавного VCSEL C-диапазона в режиме оптико-электрического преобразователя

2018 ◽  
Vol 44 (1) ◽  
pp. 76
Author(s):  
М.Е. Белкин
Keyword(s):  
Fiber Optics ◽  
Wavelength Division Multiplexing ◽  
High Speed ◽  
Low Cost ◽  
Optical Cavity ◽  
Resonant Cavity ◽  
Cavity Surface ◽  
Telecommunication System ◽  
Wavelength Division ◽  
Photo Detection

AbstractThe results of an experimental study for a long wavelength vertical cavity surface-emitting laser of a wafer-fused construction as an effective resonant cavity enhanced photodetector of analog optical signals are described. The device is of interest for a number of promising microwave photonics applications and for creation of a low-cost photoreceiver in a high-speed fiber optics telecommunication system with dense wavelength division multiplexing. The schematic of the testbed, the original technique allowing to calculate the passband of the built-in optical cavity, and the results of measuring dark current, current responsivity, amplitude- and phase-frequency characteristics during the process of photo-detection are demonstrated.

A Three-Channels WDN Based on Multimode Interference Photonic Crystal

2012 ◽  
Vol 571 ◽  
pp. 445-449
Author(s):  
Jia Han Yan
Keyword(s):  
Photonic Crystal ◽  
Integrated Circuits ◽  
Wavelength Division Multiplexing ◽  
Transmission Rate ◽  
Multimode Interference ◽  
Practical Applications ◽  
Wavelength Division ◽  
Guided Mode ◽  
Multiple Wavelength ◽  
Waveguide System

A photonic crystal waveguide coupled structure can be constructed by putting three photonic crystal waveguides in parallel and adjacent form. Study the coupling of the approximate solution interference acts and the self-image phenomenon of this multi-mode waveguide system based on the guided mode propagation analysis method, a three-channels multimode interference wavelength division multiplexing is designed. The presented device not only has a high transmission rate, but also has the advantages of multiple wavelength selection and may have potential and practical applications in the field of photonic integrated circuits in future.

Mode-selective coupler for wavelength multiplexing using LiNbO3:Ti optical waveguides

Open Physics ◽  
2008 ◽  
Vol 6 (3) ◽  
Author(s):  
Daniel Runde ◽  
Stefan Breuer ◽  
Detlef Kip
Keyword(s):  
Lithium Niobate ◽  
Wavelength Division Multiplexing ◽  
Optical Waveguides ◽  
Directional Coupler ◽  
Optical Network ◽  
Single Mode ◽  
Network Nodes ◽  
Wavelength Division ◽  
Large Bandwidth ◽  
Channel Waveguides

AbstractA mode-selective directional coupler based on titanium in-diffused channel waveguides in lithium niobate is investigated. This coupler may be utilized as a key part of an add-drop multiplexer for dense wavelength division multiplexing in optical network nodes. The proposed coupler is based on evanescent coupling of the fundamental mode of a single-mode channel to the first higher mode of a parallel bi-modal waveguide. Our experimental results show that a compact directional coupler with coupling efficiencies larger than 90%, large bandwidth around 1550 nm, and with negligible polarization dependence can be realized using electro-optic lithium niobate substrates.

scholarly journals Optical nonreciprocity with large bandwidth in asymmetric hybrid slot waveguide coupler

2015 ◽  
Vol 23 (3) ◽  
pp. 3690 ◽  
Author(s):  
Zheqi Wang ◽  
Lei Shi ◽  
Xinbiao Xu ◽  
Jihua Zhang ◽  
Jiali Zhang ◽  
...  
Keyword(s):  
Slot Waveguide ◽  
Waveguide Coupler ◽  
Large Bandwidth ◽  
Asymmetric Hybrid ◽  
Optical Nonreciprocity

scholarly journals An Energy-Efficient Silicon Photonic-Assisted Deep Learning Accelerator for Big Data

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Mengkun Li ◽  
Yongjian Wang
Keyword(s):  
Energy Efficiency ◽  
Big Data ◽  
Deep Learning ◽  
Wavelength Division Multiplexing ◽  
High Speed ◽  
Human Performance ◽  
Feature Maps ◽  
Wavelength Division ◽  
Large Bandwidth ◽  
Silicon Photonic

Deep learning has become the most mainstream technology in artificial intelligence (AI) because it can be comparable to human performance in complex tasks. However, in the era of big data, the ever-increasing data volume and model scale makes deep learning require mighty computing power and acceptable energy costs. For electrical chips, including most deep learning accelerators, transistor performance limitations make it challenging to meet computing’s energy efficiency requirements. Silicon photonic devices are expected to replace transistors and become the mainstream components in computing architecture due to their advantages, such as low energy consumption, large bandwidth, and high speed. Therefore, we propose a silicon photonic-assisted deep learning accelerator for big data. The accelerator uses microring resonators (MRs) to form a photonic multiplication array. It combines photonic-specific wavelength division multiplexing (WDM) technology to achieve multiple parallel calculations of input feature maps and convolution kernels at the speed of light, providing the promise of energy efficiency and calculation speed improvement. The proposed accelerator achieves at least a 75x improvement in computational efficiency compared to the traditional electrical design.

Sign in / Sign up

Export Citation Format

Share Document