Article
Optics
Nikhil Dhingra, Hamid Mehrvar, Pierre Berini
Summary: We propose a broadband plasmonic electrooptic modulator that operates at telecommunications wavelengths. The use of indium tin oxide in the modulator allows for driving the modulator through its epsilon-near-zero point. The modulator has a long active section, enabling it to exceed bandwidths of 200 GHz.
Article
Engineering, Electrical & Electronic
Xun Guan, Mingyang Lyu, Wei Shi, Leslie Ann Rusch
Summary: In this paper, we propose and experimentally demonstrate a polarization-insensitive single sideband modulator based on silicon microring modulators. The modulator splits and modulates the two orthogonal polarization states of an input laser using an on-chip silicon polarization splitter rotator, overcoming the polarization dependence of the silicon photonic modulator. The adoption of an MRM relieves the bandwidth limitation in polarization-diverse versions of SiP Mach-Zehnder modulators and improves the resistance of the modulated signal to chromatic dispersion.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Mingli Zou, Liqun Sun, Xuan Wang
Summary: We proposed a six-gas simultaneous detection system based on wavelength modulation spectroscopy (WMS), using five different lasers combined with a wavelength division multiplexer to detect the six gases. The gases were measured using frequency division multiplexing (FDM) and time division multiplexing (TDM) principles. A Raspberry Pi was used for data processing and displaying the detected gas concentrations. The system exhibited fast response time, compact size, and high detection sensitivity, making it promising for dissolved gas analysis (DGA) in transformer oil and other material aging processes.
IEEE SENSORS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Xun Guan, Wei Shi, Leslie Ann Rusch
Summary: Silicon photonics combined with microring modulators can achieve ultra-dense wavelength division multiplexing transmission, enhancing spectral efficiency. The study reports achieving channel spacing comparable to the symbol rate in each WDM channel, reaching 80% spectrum occupation, while also addressing interchannel interference issues.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Muhammad Sajid Sarwar, Muneeb Ahmad, Soo Young Shin
Summary: This work proposes a spectral efficient frequency division multiplexing with subcarrier index modulation (SEFDM-SIM) method for multi-input multi-output (MIMO) wireless networks. SEFDM employs non-orthogonal frequency division multiplexing to enhance the spectral efficiency (SE) but with increased inter-carrier interference compared to traditional orthogonal frequency division multiplexing (OFDM). In SEFDM-SIM, information is conveyed not only by M-ary signal constellations but also by the indices of the subcarriers. Both analytic and simulation results demonstrate that the proposed MIMO-SEFDM-SIM outperforms conventional MIMO-OFDM and MIMO-OFDM-SIM in SE, while achieving improved bit error rate (BER) compared to MIMO-OFDM and MIMO-SEFDM systems.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2023)
Article
Physics, Multidisciplinary
Lin Li, Abhishek Sharma
Summary: This study focuses on achieving high data rate capacity through visible light communication, using diffused channel modeling and channel modeling. The reported results demonstrate successful transmission of data under specific conditions.
FRONTIERS IN PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
David W. U. Chan, Xiong Wu, Zunyue Zhang, Chao Lu, Alan Pak Tao Lau, Hon Ki Tsang
Summary: This paper presents a compact and high-bandwidth CMOS compatible silicon microring modulator with an ultra-wide free-spectral range. By utilizing this modulator for intensity modulation-direct detection transmission and wavelength division multiplexing, high-speed data transmission is achieved.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Automation & Control Systems
Di Mou, Haoyu Wang, Liqiang Yuan, Quanming Luo, Yalun Li, Weicheng Liu, Zhengming Zhao
Summary: This article proposes a TDM modulation technology to enhance the efficiency of MMAB converters in multiport power electronic transformers. The TDM modulation achieves efficiency improvement by adopting different structures and dc bias capacitors. Through analyzing the steady-state characteristics and selecting the optimal combination structure based on branch powers, a simple and efficient TDM modulation technology is formed.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Alishah Khalid, Habib Ullah Manzoor, Hafiz Ashiq Hussian, Moustafa H. Aly
Summary: In this paper, the effect of combining time-division multiplexing (TDM) with dense wavelength division multiplexing (DWDM) to reduce four wave mixing (FWM) is analyzed. The simulations at different data rates using 2-TDM, 4-TDM, and 8-TDM show that TDM can significantly enhance system quality while reducing FWM efficiency. A trade-off between system quality and FWM efficiency is performed by adjusting the data rates.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Optics
Ali Mahmoodi, Mehdi Miri, Mohammad Hossein Sheikhi, Sohrab Mohammadi-Pouyan
Summary: This paper proposes a design for a high extinction ratio Mach-Zehnder optical modulator. It utilizes the switchable refractive index of GSST phase change material to induce destructive interference and realize amplitude modulation. An asymmetric input splitter is designed for the MZI to compensate for amplitude differences and improve modulator performance. Simulation results show high extinction ratio and low insertion loss for the designed modulator at 1550 nm wavelength.
Article
Optics
Chenghao Feng, Zhoufeng Ying, Zheng Zhao, Jiaqi Gu, David Z. Pan, Ray T. Chen
Summary: A silicon photonics-based digital comparator architecture is proposed in this study, capable of efficiently performing high-bit comparisons for fixed-point or floating-point binary inputs. Experimental results demonstrate that this architecture outperforms traditional transistor-based electronic comparators in terms of both computational speed and power efficiency.
LASER & PHOTONICS REVIEWS
(2021)
Article
Engineering, Electrical & Electronic
Jiaqi Wang, Huabin Qiu, Zhiwei Wei, Yuzhi Chen, Youfu Geng, Yu Du, Zhenzhou Cheng, Xuejin Li
Summary: This study introduces a graphene-based waveguide-integrated multimode phase modulator to individually modulate different modes in a multimode waveguide device. By optimizing the waveguide structures, a Mach-Zehnder interferometer modulator with different GNS patterns on each arm is designed, providing new possibilities for future high-density on-chip MDM systems.
IEEE PHOTONICS JOURNAL
(2021)
Article
Optics
Anuranjana, Sanmukh Kaur, Rakesh Goyal, Sushank Chaudhary
Summary: This work analyzes the performance of a terrestrial MDM-WDM FSO link at a data rate of 1000 Gbps using a dual polarization-quadrature phase shift keying (DP-QPSK) modulation scheme. The study investigates the link's performance considering linearly polarized (LP) 01 and 02 modes with a channel capacity and spacing of 10 x 100 Gbps and 10 GHz respectively. The evaluated parameters include received optical power and signal to noise ratio (SNR) under different weather conditions (clear, light fog, medium fog, and heavy fog) over a transmission range of 1.2 km to 20 km.
Article
Computer Science, Information Systems
Muhammad Sajid Sarwar, Soo Young Shin
Summary: This letter proposes the combination of spectrally efficient frequency division multiplexing (SEFDM) with orthogonal frequency division multiplexing (OFDM) using index modulation (IM). The article discusses the advantages of OFDM-SEM over classical OFDM-IM and SEFDM-IM in terms of bit error rate, as well as the impact of intercarrier interference and a potential solution through a pulse-shaping filter.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Abdolkhalegh Mohammadi, Zibo Zheng, Xiaoguang Zhang, Leslie Ann Rusch, Wei Shi
Summary: We present a segmented modulator with traveling-wave electrodes made of silicon, which achieved a high electro-optic bandwidth of over 67 GHz and a low V-p of 5 V. By dividing the long optical modulator into shorter segments, we demonstrated a higher bandwidth without sacrificing modulation efficiency or optical loss. We analyzed the bandwidth limitation caused by delay mismatch between the driving and optical signals, and found that the misalignment of driving delays between segments can be described using a finite impulse response filter. With this modulator, we achieved high-speed optical transmission of 120 Gbaud 8-level amplitude shift keying with coherent detection, resulting in a net rate of 336.4 Gb/s on a single polarization when considering forward error correction overhead. Our design has the potential to achieve 1 Tb/s using dual-polarization IQ modulation.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
