Article
Engineering, Electrical & Electronic
David Benedicto, Juan A. Valles, Juan C. Martin
Summary: The output signal intensity distribution of several fs-laser written double-core active waveguides was studied, revealing a correlation between the ratio of cores' output powers and input pump power. A model based on coupled-mode theory was proposed to explain the phenomenon and simulations showed good agreement with experiments when allowing for small differences between cores' parameters.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Weida Zhang, Liting Lin, Bijiao Lan, Jiantao Liu, Yun Chen, Guiyao Zhou, Shifeng Zhou
Summary: The hybridization of Si with Sb ions in Er3+-doped antimony-silica glass system is favorable for reducing phonon energy and improving optical properties. The broadening of near-infrared emission bandwidth of Er3+ from 61 to 82 nm is achieved. Antimony-silica glass fiber exhibits excellent gain performance, making it a promising material for fiber amplifier and laser.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Engineering, Electrical & Electronic
Yang Lou, Yang Chen, Zhimu Gu, Qiang Qiu, Chanjuan Shi, Le He, Yingbin Xing, Jinggang Peng, Haiqing Li, Yingbo Chu, Nengli Dai, Jinyan Li
Summary: The report introduces the use of Er3+ and Ce3+ in phosphosilicate fiber to regulate SESA and extend the L-band gain bandwidth. The addition of Ce3+ weakens the SESA effect, leading to an extension of the longest wavelength to 1623 nm.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Yongzhi Wang, Hongyu Luo, Hongtao Gong, Jiale Xu, Bo Wu, Jianfeng Li, Yong Liu
Summary: We present a high-power, polarization-maintaining (PM) Er3+-doped fluoride fiber amplifier, which enables watt-level, linearly-polarized (LP) superfluorescent outputs around 2.8 μm. This work provides an alternative way for high-power, LP, mid-IR FSS, enabling a range of real-world applications.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Vitaly Mikhailov, Jiawei Luo, Daryl Inniss, Man F. Yan, Yingzhi Sun, Gabriel S. Puc, Robert S. Windeler, Paul S. Westbrook, Yuriy Dulashko, David J. DiGiovanni
Summary: This paper reviewed different optical amplification technologies beyond C- and L- bands and discussed their advantages and disadvantages. It was found that these technologies have not been implemented in practical systems due to the sufficient capacity provided by C- and L- bands amplified systems and the lack of a complete optical components ecosystem. However, O-band amplification may be an attractive solution as it can meet the overall capacity demand and power budget reduction requirements caused by the increasing bit rate of pluggable modules.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Yiguang Jiang, Zhiming Zhou, Pengwei Yin, Longfei Zhang, Wenkai Zhao, Yanchao Li, Long Zhang
Summary: Improving the physicochemical and optical properties of erbium ion-doped fluorotellurite glass is achieved by reducing hydroxyl content and introducing WO3 modifier. The resulting Er3+-doped fluorotellurite glass possesses stable thermal properties and excellent visible-near-mid-infrared optical properties, making it a promising candidate for infrared fiber amplifiers and solid-state lasers.
Article
Optics
Zhimu Gu, Qiang Qiu, Le He, Yang Chen, Yang Lou, Xiaoke Yin, Shaokun Liu, Wenzhen Li, Xinyue Zhao, Yingbin Xing, Yingbo Chu, Nengli Dai, Jinyan Li
Summary: A novel cladding-pumped 4-core erbium-doped fiber with a pedestal structure has been proposed and fabricated, showing significant gain improvement and noise reduction in the L-band. Experimental results demonstrate the high average gain and low average noise figure of this new fiber.
Article
Engineering, Electrical & Electronic
Taiji Sakamoto, Masaki Wada, Shinichi Aozasa, Ryota Imada, Takashi Yamamoto, Kazuhide Nakajima
Summary: By adjusting the length of the erbium-doped fiber, a 12-core EDFA can operate in both C and L bands, demonstrating good amplification characteristics and applicability for inline amplified transmission systems. The study found that for long-distance SDM transmission, MDL impacts the power efficiency of randomly coupled multi-core EDFAs.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Xiao Shen, Sheng Chen, Yan Sun, Xin Wang, Wei Wei, Lili Hu
Summary: By optimizing the BaO content, Er3+-doped phosphate glass with good flatness of the emission spectrum in the L+ band was successfully prepared, with sample B31 showing the best flatness. The study provides a reference for materials of optical amplifiers.
IEEE PHOTONICS JOURNAL
(2021)
Article
Optics
Alexey A. Wolf, Mikhail Skvortsov, Ivan A. Lobach, Alexandr Dostovalov, Sergey A. Babin
Summary: An all-fiber 4-core Yb-doped laser with a cavity formed by fiber Bragg gratings directly inscribed in each core with femtosecond laser pulses and 4% Fresnel reflection from the output fiber end face is demonstrated. The study reveals how the diameter of the active fiber winding affects the power distribution between the cores and proposes a mechanism for radiation concentration based on bending induced stress. The research also explores the optical and radio-frequency spectra of the output laser radiation and observes a narrowband lasing with periodic linear sweeping of central wavelength in the multicore fiber laser for the first time.
Article
Engineering, Electrical & Electronic
John D. Downie, Yongmin Jung, Sergejs Makovejs, Merrion P. Edwards, David J. Richardson
Summary: We compare different options for amplification in trans-oceanic repeatered submarine systems using multicore fiber transmission. Our analysis focuses on relative cable capacity and relative system cost/bit. We evaluate the optical performance of parallel single-core erbium-doped fiber amplifiers (SC-EDFAs) and multicore erbium-doped fiber amplifiers (MC-EDFAs) with various configurations. Key parameters like noise figure, amplifier bandwidth, electrical-to-optical conversion efficiency, and amplifier cost impact the expected capacity and cost/bit performance. Our findings show that MC-EDFAs with either core- or cladding-pumping may offer lower cost/bit compared to parallel SC-EDFAs, but cladding-pumping could reduce cable capacities due to higher noise figure and potentially lower amplifier bandwidth.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Federica Poli, Jesper Laegsgaard, Annamaria Cucinotta, Stefano Selleri
Summary: This article analyzes the influence of heat load generated in Yb-doped cores of four-core fibers on the guiding properties of supermodes, calculating effective area and single-mode regime for fibers with different core-to-core separations. Useful guidelines for choosing core number in multicore fiber cross-section are provided, showing a trade-off between effective area and single-mode regime.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Themistoklis Chrysostomidis, Ioannis Roumpos, Konstantinos Fotiadis, Jinfeng Mu, Athanasios Manolis, Christos Vagionas, Meindert Dijkstra, Sonia Garcia Blanco, Theonitsa Alexoudi, Konstantinos Vyrsokinos
Summary: This paper presents a comprehensive study on the high-speed wavelength-division multiplexing (WDM) transmission capabilities of a monolithically integrated Al2O3:Er3+ spiral waveguide amplifier. The results demonstrate high-performance transmission at different data rates and without the need for digital signal processing (DSP) applied on the transmitter or receiver side.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Optics
Yuewu Fu, Tonghe Sun, Jun Li, Ying Tang, Yu Yang, Siliang Tao, Fei Wang, Daming Zhang, Guanshi Qin, Zhixu Jia, Dan Zhao, Weiping Qin
Summary: A polymer waveguide amplifier with loss compensation and multi-band amplification capability in the (S + C) band is demonstrated using NaYF4:Tm,Yb@NaYF4@NaYF4:Er nanoparticles-doped SU-8 as the gain medium, achieving a relative gain of 6-8 dB and expanding the operating wavelength range.
Article
Engineering, Electrical & Electronic
Wiktor Walasik, Robert E. Tench, Gustavo Rivas, Jean-Marc Delavaux, Ian Farley
Summary: We present the performance of CW and pulsed single-clad PM Tm-doped fiber amplifiers optimized for the wavelength band from 1760 to 1960 nm. In the CW regime, we achieved high output power levels up to 3 W with a two-stage TDFA designed for operation at 1760 nm. The optimized two-stage TDFA demonstrated OSNR values >55 dB in 0.1 nm. In the pulsed regime, the amplifier performed with input pulses of 50-100 ns and repetition rates from 100 kHz to 1 MHz. The output pulse shape was studied in detail with square and shaped input pulses, resulting in an optimized square output pulse shape with average output powers of 2 W and peak output powers of 20 W (10% duty cycle) with pulse energies of 1.6 mu J.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Lin Ma, Kyozo Tsujikawa, Nobutomo Hanzawa, Shinichi Aozasa, Saki Nozoe, Fumihiko Yamamoto
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2016)
Article
Engineering, Electrical & Electronic
Nobutomo Hanzawa, Kyozo Tsujikawa, Kenji Kurokawa, Saki Nozoe, Takashi Matsui, Fumihiko Yamamoto
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2016)
Article
Engineering, Electrical & Electronic
Yoko Yamashita, Shuntaro Makino, Takeshi Fujisawa, Nobutomo Hanzawa, Taiji Sakamoto, Takashi Matsui, Kyozo Tsujikawa, Fumihiko Yamamoto, Kazuhide Nakajima, Kunimasa Saitoh
IEEE PHOTONICS TECHNOLOGY LETTERS
(2017)
Article
Engineering, Electrical & Electronic
Kunimasa Saitoh, Nobutomo Hanzawa, Taiji Sakamoto, Takeshi Fujisawa, Yoko Yamashita, Takashi Matsui, Kyozo Tsujikawa, Kazuhide Nakajima
OPTICAL FIBER TECHNOLOGY
(2017)
Review
Engineering, Electrical & Electronic
Eri Taguchi, Takeshi Fujisawa, Yoko Yamashita, Shuntaro Makino, Nobutomo Hanzawa, Taiji Sakamoto, Takashi Matsui, Kyozo Tsujikawa, Kazuhide Nakajima, Fumihiko Yamamoto, Kunimasa Saitoh
IEICE TRANSACTIONS ON ELECTRONICS
(2018)
Article
Engineering, Electrical & Electronic
Kyozo Tsujikawa, Kenji Kurokawa, Nobutomo Hanzawa, Saki Nozoe, Takashi Matsui, Kazuhide Nakajima
OPTICAL FIBER TECHNOLOGY
(2018)
Review
Engineering, Electrical & Electronic
Eri Taguchi, Takeshi Fujisawa, Yoko Yamashita, Shuntaro Makino, Nobutomo Hanzawa, Taiji Sakamoto, Takashi Matsui, Kyozo Tsujikawa, Kazuhide Nakajima, Fumihiko Yamamoto, Kunimasa Saitoh
IEICE TRANSACTIONS ON ELECTRONICS
(2018)
Article
Engineering, Electrical & Electronic
Saki Nozoee, Ryohei Fukumoto, Yoshimichi Amma, Taiji Sakamoto, Takashi Matsui, Katsuhiro Takenaga, Yoshiteru Abe, Kyozo Tsujikawa, Nobutomo Hanzawa, Shinichi Aozasa, Kazuhiko Aikawa, Masaharu Ohashi, Kazuhide Nakajima
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2019)
Article
Engineering, Electrical & Electronic
Takashi Matsui, Kyozo Tsujikawa, Takehisa Okuda, Nobutomo Hanzawa, Yuto Sagae, Kazuhide Nakajima, Yasuyuki Fujiya, Kazuyuki Shiraki
IEICE TRANSACTIONS ON COMMUNICATIONS
(2020)
Article
Engineering, Electrical & Electronic
Nobutomo Hanzawa, Takayoshi Mori, Yuto Sagae, Yusuke Yamada, Takashi Matsui, Kazuhide Nakajima
Summary: This paper investigates the relationship between cross-sectional geometry and splicing loss in a four-core multicore fiber (MCF) with a standard 125-mu m cladding diameter. We show that a binarized cross-sectional image helps accurately determine the cladding/core center. The validity of the measured geometry is demonstrated by comparing the measured and estimated splice loss histograms. Our results suggest that a four-core MCF can potentially achieve a feasible splicing loss property by considering the most stringent geometrical tolerance in the existing standard. However, further improvement to the MCF geometry and/or connector technology will be required to ensure the lowest connector loss standard when an additional tolerance for connector ferrules is needed.
OPTICAL FIBER TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Kouhei Omoto, Nobutomo Hanzawa, Kyozo Tsujikawa, Takashi Matsui, Kazuhide Nakajima
Summary: In this study, we investigate the possibility of a hole-assisted fiber with lower attenuation property. The results show that the attenuation can be reduced by considering the glass material dependence, suitable air-hole design, and appropriate air-hole etching process.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Kenji Kurokawa, Hiroyuki Iida, Nobutomo Hanzawa, Takaya Oguma, Yoko Yamashita, Takayoshi Mori, Takashi Matsui, Kazuhide Nakajima
Summary: The study demonstrates that 4-core multi-core fiber has a stimulated Raman scattering threshold 2.6 times higher than single-core fiber, enabling signal transmission over 5 km with self-power feeding of more than 600 mW.
2022 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Shota Ishikawa, Kenji Kurokawa, Nobutomo Hanzawa, Takashi Matsui, Kazuhide Nakajima
2019 24TH MICROOPTICS CONFERENCE (MOC)
(2019)
Proceedings Paper
Engineering, Electrical & Electronic
Yoko Yamashita, Shuntaro Makino, Takeshi Fujisawa, Kunimasa Saitoh, Nobutomo Hanzawa, Taiji Sakamoto, Takashi Matsui, Kyozo Tsujikawa, Fumihiko Yamamoto, Kazuhide Nakajima
2016 IEEE PHOTONICS CONFERENCE (IPC)
(2016)
Proceedings Paper
Engineering, Electrical & Electronic
Yoko Yamashita, Yuhei Ishizaka, Nobutomo Hanzawa, Takeshi Fujisawa, Taiji Sakamoto, Takashi Matsui, Kyozo Tsujikawa, Fumihiko Yamamoto, Kazuhide Nakajima, Kunimasa Saitoh
2016 21ST OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC) HELD JOINTLY WITH 2016 INTERNATIONAL CONFERENCE ON PHOTONICS IN SWITCHING (PS)
(2016)
