Article
Engineering, Electrical & Electronic
Vladimir Gordienko, Filipe M. Ferreira, Chandra B. Gaur, Nick J. Doran
Summary: The study focuses on polarization insensitive fiber optical parametric amplifiers utilizing a balanced polarization diversity loop with at least two unidirectional gain fibers. Three variants of looped polarization insensitive FOPAs optimized for noise figure, mitigation of nonlinear impairments, and their trade-off are described and compared. Testing results demonstrate the ability of these FOPAs to deliver low noise figures <6 dB for output signal power as high as 29 dBm while enabling polarization insensitive gain.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Acoustics
Przemyslaw Krehlik, Lukasz Sliwczynski, Lukasz Buczek
Summary: In this article, a solution is presented to improve signal-to-noise ratio in long-haul fiber-optic paths by combining optical signal amplification with optical-electrical-optical regeneration. Experiments conducted in the laboratory confirmed the theoretical predictions, showing that placing optical-electrical-optical regenerators at appropriate points along the link can achieve the required signal-to-noise ratio.
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2021)
Article
Optics
Shota Ishimura, Hidenori Takahashi, Takehiro Tsuritani, Masatoshi Suzuki
Summary: We propose a method to increase the bandwidths of optical FM signals using the cascaded four-wave-mixing process and demonstrate its potential in generating wideband FM signals and enhancing the signal-to-noise ratio for analog communication.
Article
Engineering, Electrical & Electronic
Shimpei Shimizu, Takayuki Kobayashi, Takushi Kazama, Takeshi Umeki, Masanori Nakamura, Koji Enbutsu, Takahiro Kashiwazaki, Ryoichi Kasahara, Kei Watanabe, Yutaka Miyamoto
Summary: The optical parametric amplifier (OPA) is a promising technology for optical communications due to its wideband, high gain, and fast transient response. It enables various optical signal processing and wavelength conversion using idler light generated during amplification. A PPLN waveguide serves as the amplification medium, allowing for wideband and high-gain amplification. This paper presents the configuration and applications of a 4-port PPLN module, including wideband inline amplification demonstration and inter-band wavelength conversion between C- and S-bands.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Cheng Guo, Afshin Shamsshooli, Youichi Akasaka, Tadashi Ikeuchi, Michael Vasilyev
Summary: The potential of a hybrid amplifier consisting of two fiber parametric wavelength converters and an erbium-doped fiber amplifier for the S-band was explored. A simple quantum model of the wavelength-converter noise figure was validated experimentally and used to optimize the hybrid amplifier settings. The total NF can be below 6 dB with a first stage conversion efficiency above 4 dB, and as low as 4 dB with a conversion efficiency of 10 dB or higher in the first stage. The potential impact of pump relative noise on the NF was also estimated.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2021)
Article
Engineering, Electrical & Electronic
V Gordienko, A. D. Szabo, M. F. C. Stephens, V. Vassiliev, C. B. Gaur, N. J. Doran
Summary: The experiment found that SBS limits the nonlinear phase shift unless mitigated, deriving corresponding limits on signal gain and conversion efficiency for fiber optic parametric devices. Air gaps and fiber tapers were examined for SBS mitigation in bidirectional loops, with an increase in SBS threshold attributed primarily to excess loss.
OPTICAL FIBER TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Chenxia Liu, Tianwei Jiang, Hanyue Wang, Mingzheng Lei, Tao Liu, Song Yu
Summary: This paper proposes a stable RF transfer scheme based on phase modulation, utilizing passive compensation and a single mixer to reduce power consumption. By using a phase modulator and a single-mode fiber, bias drifting issue is eliminated. The measured ADEV of the transmission system is better than that of the reference atomic clock. The proposed system has potential applications in square kilometer arrays and remote clock comparison.
IEEE PHOTONICS JOURNAL
(2023)
Article
Optics
Wei Liu, Jiaxin Song, Pengfei Ma, Hu Xiao, Pu Zhou
Summary: This study analyzes the impact of background spectral noise in phase-modulated single-frequency seed lasers on the spectral purity of high-power narrow-linewidth fiber amplifiers. Design strategies to maintain high spectral purity are provided, such as filtering out background spectral noise or using a counter-pumped configuration in the fiber amplifier. Contrast experiments have validated the theoretical model and design strategies for high-spectral-purity operation.
PHOTONICS RESEARCH
(2021)
Review
Chemistry, Multidisciplinary
Jacek Swiderski
Summary: This paper briefly reviews the current state-of-the-art SC sources based on fluoroindate fibers and explores the advances in high-power continuum generation using different pump schemes.
APPLIED SCIENCES-BASEL
(2022)
Article
Optics
Bastien Rouze, Pierre Pichon, Mathilde Gay, Laurent Bramerie, Laurent Lombard, Anne Durecu
Summary: We present one of the first demonstrations of a CBC-based laser emitter transmitting a 10.66 Gb/s telecom signal in free-space optics. Both NRZ and DPSK modulations were tested, with the signal split and amplified in three fiber amplifiers. Using a phase-tagging technique, the CBC achieved low residual phase errors, allowing for high-quality data transmission. An analysis of various parameters showed that the modulation depth and optical path difference were critical for carrying data on a CBC signal.
Article
Engineering, Electrical & Electronic
Vitor Ribeiro, Minji Shi, Auro M. Perego
Summary: In this study, we investigated the impact of ZDW fluctuations in coupled dual-core fiber optical parametric amplifiers, and compared it to single-core single-pump FOPA. We developed a Monte Carlo model and an analytical model to simulate and validate the results, and found that coupled dual-core FOPA can significantly reduce the impact of ZDW fluctuations compared to single-core ones.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Shota Ishimura, Takashi Kan, Hidenori Takahashi, Takehiro Tsuritani, Masatoshi Suzuki
Summary: This paper demonstrates the generation of ultralinear and ultrawideband frequency-modulated continuous-wave (FMCW) signals using an optical parametric wideband frequency modulation (OPWBFM) method. The OPWBFM method expands the bandwidths of FMCW signals beyond the electrical bandwidths of optical modulators through a cascaded four-wave mixing (FWM) process. By synchronizing the phase of an input complex conjugate pair of an FMCW signal using an optical frequency comb, the phase noise expansion can be mitigated. The feasibility of an ultralinear and ultrawideband FMCW system with a short measurement time is demonstrated through successful generation of a 140-GHz FMCW signal.
Article
Materials Science, Ceramics
A. P. Velmuzhov, V. S. Shiryaev, M. Sukhanov, T. Kotereva, B. S. Stepanov, G. E. Snopatin
Summary: Optical fibers based on pure Ge20Se80 and Ga10Ge15Te73I2 glasses are used as sensing elements, and flexible fibers based on polycrystalline silver halides and As-Se glasses are used to connect the sensing elements to an IR Fourier spectrometer. Fiber-optic probes with different combinations of materials are manufactured and tested for FEWS analysis of organic mixtures, showing promising results.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Optics
Abhishek Monde, Ritwick Das
Summary: The research presents a simple approach to generate broadband pulses through optical parametric processes by satisfying adiabatic constraints. Experimental results show that the optical parametric generation process can achieve a high conversion efficiency of approximately 70% across the entire tunable frequency range.
Article
Engineering, Electrical & Electronic
E. A. Romanova, S. Korsakova
Summary: This study addresses the challenge of determining chemical composition of substances remotely in real time by developing fiber-optic sensors for mid-IR spectroscopy. It is found that the ratio of the sensing element length to the power decay length of a fiber mode is a crucial parameter for determining the sensor's sensitivity.
OPTICAL AND QUANTUM ELECTRONICS
(2021)
Article
Optics
Ke Li, Shenghao Liu, Xiaoke Ruan, Dave J. Thomson, Yang Hong, Fan Yang, Lei Zhang, Cosimo Lacava, Fanfan Meng, Weiwei Zhang, Periklis Petropoulos, Fan Zhang, Graham T. Reed
Article
Engineering, Electrical & Electronic
Dong Wu, Li Shen, Haonan Ren, Meng Huang, Cosimo Lacava, Joseph Campling, Shiyu Sun, Thomas W. Hawkins, Ursula J. Gibson, Periklis Petropoulos, John Ballato, Anna C. Peacock
Summary: Silicon core fibers have shown promise for nonlinear signal processing, with advancements in parametric amplification, wavelength conversion, and all-optical signal processing, showcasing their potential for future telecommunications systems.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Omar F. Anjum, Massimiliano Guasoni, Periklis Petropoulos
Summary: Authors demonstrate achieving all-optical control of spatial beam intensity at the fibre output by injecting a combination of LP11 modes in a few-mode high-birefringence fibres and varying polarisation at the fibre input, these results may also be generalized to cases using different and multiple higher order modes.
IET OPTOELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Yang Hong, Ke Li, Cosimo Lacava, Shenghao Liu, David J. Thomson, Fanfan Meng, Xiaoke Ruan, Fan Zhang, Graham T. Reed, Periklis Petropoulos
Summary: The study presents a direct detection transmission using an integrated silicon optical receiver at over 100 Gb/s, demonstrating its effectiveness in various optical signal modes. By adjusting the TIA voltage supply, the integrated optical receiver can achieve high-speed optical transmission while balancing electrical bandwidth and transimpedance gain.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Sijing Liang, Saurabh Jain, Lin Xu, Kyle R. H. Bottrill, Natsupa Taengnoi, Massimiliano Guasoni, Peng Zhang, Mengben Xiao, Qiongyue Kang, Yongmin Jung, Periklis Petropoulos, David J. Richardson
Summary: An 80 nm bandwidth dual-stage diode-pumped lumped Raman amplifier with a short length of highly nonlinear fiber is demonstrated, achieving a high overall gain of 27 dB. By adjusting the spectral gain profile in the two amplifier stages, Rayleigh back scattering impact is mitigated and thermally generated noise is controlled, resulting in an average noise figure of 5.8 dB with <1 dB variation across the full amplifier bandwidth.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Yang Hong, Kyle R. H. Bottrill, Natsupa Taengnoi, Naresh K. Thipparapu, Yu Wang, Jayanta K. Sahu, David J. Richardson, Periklis Petropoulos
Summary: Efficient O-band amplification technologies have enabled longer reach transmission considerations, highlighting the impact of chromatic dispersion on direct-detection systems. Experimental transmission studies over SMF at different wavelengths show varied performance of optical DD formats, with OOK and QPSK demonstrating better bit error rate performance than PAM4 in certain scenarios. The power sensitivity and requirements at the photodiode differ significantly between wavelengths and modulation formats, emphasizing the importance of optimizing system parameters for long-distance O-band transmission.
Article
Optics
Natsupa Taengnoi, Kyle R. H. Bottrill, Yang Hong, Yu Wang, Naresh K. Thipparapu, Jayanta K. Sahu, Periklis Petropoulos, David J. Richardson
Summary: The emergence of bismuth-doped fiber amplifiers (BDFAs) has the potential to transmit high-speed WDM signals over long distances in the O-band spectral region, greatly enhancing the scope of systems using these wavelengths. This paper presents a comprehensive experimental study on the basic characteristics of an O-band BDFA based on a phosphosilicate optical fiber and discusses the implications of these findings on high bit-rate multichannel systems.
Article
Optics
Yang Hong, Kyle R. H. Bottrill, Thomas D. Bradley, Hesham Sakr, Gregory T. Jasion, Kerrianne Harrington, Francesco Poletti, Periklis Petropoulos, David J. Richardson
Summary: The growing digital economy demands high-capacity, low-latency optical communication links, and hollow-core fibers (HCFs) show superior performance compared to traditional fibers in transmitting intensity-modulation and direct-detection signals over long distances. Using HCF for transmission can significantly improve reach and reduce latency, potentially revolutionizing optical networks with simple, cost-effective, high-capacity links.
LASER & PHOTONICS REVIEWS
(2021)
Article
Optics
Yang Hong, Feng Feng, Kyle R. H. Bottrill, Natsupa Taengnoi, Ravinder Singh, Grahame Faulkner, Dominic C. O'Brien, Periklis Petropoulos
Summary: Beam tracking-and-steering is essential for high-speed, narrow beam optical wireless communication systems. In this study, a high-capacity (>1Tbit/s) ten-channel wavelength-division multiplexed OWC system based on discrete multitone transmission is demonstrated using low-cost cameras for tracking and mirrors for steering. The results achieved the highest aggregate OWC capacity at this coverage over a 3.5-m perpendicular distance and up to 1.8 m lateral coverage.
Article
Engineering, Electrical & Electronic
Thien Van Luong, Xiaoyu Zhang, Luping Xiang, Tiep M. Hoang, Chao Xu, Periklis Petropoulos, Lajos Hanzo
Summary: In this paper, a deep learning-aided optical orthogonal frequency division multiplexing (O-OFDM) scheme, named O-OFDMNet, is proposed. By using deep neural networks to convert complex-valued signals into non-negative signals, the scheme improves both the bit error ratio (BER) and the peak-to-average power ratio (PAPR) for transmission over additive white Gaussian noise and frequency-selective channels. The scheme achieves the same spectral efficiency as conventional radio frequency (RF) OFDM.
IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Yang Hong, Thomas D. Bradley, Natsupa Taengnoi, Kyle R. H. Bottrill, John R. Hayes, Gregory T. Jasion, Francesco Poletti, Periklis Petropoulos, David J. Richardson
Summary: Hollow-core fibers offer beneficial properties for high-speed optical communication applications, with low latency, low chromatic dispersion, and nonlinearity. Using a system employing hollow-core nested antiresonant nodeless fiber, it is possible to achieve high-speed transmission without penalties. Compared to standard single-mode fibers, the hollow-core fiber exhibits superior performance at 1550 nm and offers over 20% capacity enhancement, making it a promising solution for achieving high capacity and low latency in future short-reach optical interconnects.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
E. Weckenmann, L. Bramerie, M. Gay, D. Perez-Galacho, F. Boeuf, L. Deniel, D. Marris-Morini, C. Peucheret
Summary: The frequency chirping properties of silicon ring resonator modulators (RRMs) are experimentally investigated under sinusoidal modulation. The modulated electric field at the output of an RRM is measured in the time domain thanks to a coherent detection system. The power and phase waveforms are then analyzed in terms of their temporal phase and amplitude for different wavelength detunings between the optical source and the resonance and for different modulation frequencies. The evolution of the frequency chirp, described through a peak-to-peak chirp parameter, is quantified as a function of wavelength detuning and modulation frequency for the first time.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Computer Science, Information Systems
Xiaoyu Zhang, Zunaira Babar, Periklis Petropoulos, Harald Haas, Lajos Hanzo
Summary: This article explores the application of O-OFDM technology in VLC and optical fiber communications, discussing its design evolution and the flexible LACO-OFDM alternative. It emphasizes the flexibility and coverage of LACO-OFDM, as well as its performance advantages and design characteristics in optical communication systems.
IEEE COMMUNICATIONS SURVEYS AND TUTORIALS
(2021)
Article
Computer Science, Information Systems
Xiaoyu Zhang, Ravinder Singh, James Farmer, Grahame Faulkner, Dominic O'brien, Periklis Petropoulos, Lajos Hanzo
Summary: This study experimentally investigated the impact of channel coding on misalignment tolerance, showing that using channel coding can improve the tolerance of links to misalignment and enhance performance.
Article
Engineering, Electrical & Electronic
Natsupa Taengnoi, Kyle R. H. Bottrill, Yang Hong, Naresh K. Thipparapu, Cosimo Lacava, Jayanta K. Sahu, David J. Richardson, Periklis Petropoulos
Summary: In this study, the tolerance of O-band 4-level PAM4 transmission to channel impairments was improved by utilizing an AMI scheme, leading to enhancements in receiver sensitivity and extension of transmission reach. The capability of 4-level AMI to mitigate nonlinear and dispersive effects was confirmed, resulting in a significant improvement in Q-factor over a 60 km transmission distance on SMF-28e. Through numerical simulations, insights into the underlying mechanisms of AMI4 were provided.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)