Article
Chemistry, Analytical
Sergio Rota-Rodrigo, Daniel Leandro, Giorgio Santarelli, Manuel Lopez-Amo, Juan Diego Ania-Castanon
Summary: We experimentally explored the relation between spectral linewidth and RIN transfer in half-open cavity random distributed feedback Raman lasers and demonstrated the possibility of adjusting the pump-to-signal RIN transfer intensity and cut-off frequency using spectral filtering in the reflector section. We applied this approach to a 50-km laser system operating in the C-Band.
Article
Engineering, Electrical & Electronic
Mikhail Skvortsov, Alexey A. Wolf, Alexandr Dostovalov, Olga N. Egorova, Sergey L. Semjonov, Sergey A. Babin
Summary: A compact random fiber laser based on a short artificial Rayleigh reflector and heavily-doped Er fibers has been proposed and optimized in terms of efficiency, linewidth, and noise level. The use of a femtosecond direct writing technique allows the fabrication of an artificial Rayleigh reflector with low insertion loss and high scattering level. The random laser shows high power, slope efficiency, and signal-to-noise ratio, with the potential for tunability.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Jiancheng Deng, Ming Shen, Yanxin Li, D. Churkin, Xuewen Shu
Summary: This study proposes and demonstrates the power scalability in a novel random Raman fiber laser (RRFL) with localized random feedback. The use of a low-reflection random fiber grating (RFG) composed of a randomly distributed sub-grating array enables the power scalability. The spectral filtering is implemented by a high-reflection fiber Bragg grating to ensure laser emission at the wavelength of the highest reflection peak of the RFG.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Jiancheng Deng, Yanxin Li, Ming Shen, Xuewen Shu
Summary: This paper proposes and demonstrates a novel single-frequency erbium-doped random distributed Bragg reflector fiber laser, constructed by a random fiber grating and a high-reflection fiber Bragg grating. The use of femtosecond laser point-by-point inscription technique for the random fiber grating enables easy and low-cost fabrication of long gratings. Experimental results show that the laser achieves stable single-peak emission and operates at a single frequency.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Zijiang Yang, Zhenxing Sun, Rulei Xiao, Gen Lv, Yunshan Zhang, Yuechun Shi, Yi-Jen Chiu, Xiangfei Chen
Summary: This paper presents a 4-channel tunable in-series distributed feedback (DFB) laser array (TIDLA) with duplex DFB sections. The total chip length is reduced by duplexing the DFB sections, and measures such as a long linearly chirped Bragg grating, multiple pi phase shifts, and two reflector sections are introduced to improve the mode stability. Experimental results show that the designed TIDLA has high output power, large SMSR, and small wavelength deviation. This technology can be applied in NG-PON2 networks where dense wavelength division multiplexing and fast channel switching are required.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Yikun Jiang, Liang Zhang, Haozhe Shou, Haoran Xie, Jilin Zhang, Yichun Li, Ying Zhang, Fufei Pang, Tingyun Wang
Summary: Cascaded Brillouin random fiber lasers (BRFLs) with laser linewidth compression were demonstrated theoretically and experimentally. The coherent time of cascading BRFL radiation is significantly prolonged while the phase noise is further suppressed. However, a quantum-noise-induced linewidth narrowing limit exists. The experimental results agree well with theoretical predictions.
IEEE PHOTONICS JOURNAL
(2022)
Article
Optics
Shengtao Lin, Zinan Wang, Jiaqi Li, Siqi Chen, Yunjiang Rao, Gangding Peng, Anderson S. L. Gomes
Summary: This study reports for the first time significant wavelength down-conversion caused by FWM in a Ytterbium/Raman random fiber laser, as well as the simultaneous observation of nonlinear optical dynamics of SRS, FWM, and self-pulsation. The experimental results agree well with theoretical calculations for the FWM process, highlighting the importance of these findings for high power Raman-based fiber lasers and random fiber lasers.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Mohammad Rashidi, Tuomas Haggren, Zhicheng Su, Chennupati Jagadish, Sudha Mokkapati, Hark H. Tan
Summary: Random lasers in GaAs nanowires can lase in resonant and nonresonant modes, depending on whether the nanowires are randomly oriented or vertically aligned. Numerical simulations show that aligned nanowires increase scattering efficiency and favor resonant lasing. Suppressing resonant modes optically can be achieved by increasing the number of excited modes.
Article
Engineering, Electrical & Electronic
Chenchen Fan, Yi An, Yang Li, Xiulu Hao, Tianfu Yao, Hu Xiao, Liangjin Huang, Jiangming Xu, Jingyong Leng, Pu Zhou
Summary: This study presents the first-ever cladding-pumped distributed-feedback Raman fiber laser with brightness enhancement. By utilizing a triple-clad purely passive fiber and optimizing the cladding-to-core area ratio, the generation of higher-order Stokes light was successfully suppressed. In the experiment, a signal laser with a maximum output power of 1 kW at 1132 nm was achieved with an optical-to-optical conversion efficiency of 92%.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Optics
Mikhail I. Skvortsov, Sofia R. Abdullina, Evgeny V. Podivilov, Alexander A. Vlasov, Danil R. Kharasov, Edgard A. Fomiryakov, Sergey P. Nikitin, Vladimir N. Treshchikov, Sergey A. Babin
Summary: This study presents a theoretical model and experimental results on the extreme linewidth narrowing of an erbium-doped fiber distributed feedback laser due to an additional random distributed feedback via Rayleigh backscattering in a long single-mode fiber. The research shows that the relative narrowing of the linewidth in such a hybrid cavity configuration may exceed six orders of magnitude.
Article
Engineering, Electrical & Electronic
Laiyang Dang, Ligang Huang, Yujia Li, Yulong Cao, Tianyi Lan, Paul Ikechukwu Iroegbu, Zhewei Cao, Kun Mei, Lei Liang, Sen Fu, Guolu Yin, Tao Zhu
Summary: In this work, a tunable single-frequency fiber laser based on longitude-purification induced by distributed feedback is demonstrated. The laser achieves high coherence and wavelength adaptability through a distributed self-injection feedback structure (DSIFS). Experimental results show excellent side mode suppression, frequency noise suppression, and long-term stability of the laser output.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Optics
Yanan Niu, Pinggang Jia, Jianhui Su, Jingyi Wang, Guowen An, Qianyu Ren, Jijun Xiong
Summary: We propose a tunable random fiber laser based on the combination of random grating and highly reflective fiber Bragg grating to reduce the pumping threshold and achieve a short-cavity single-mode transmission with a narrow-linewidth. The random grating is regarded as a linear combination of uniform fiber gratings with different periods. We constructed a random fiber laser with a linewidth of 1.68 kHz and a threshold of 29.2 mW using the random grating and highly reflective FBG combined with an erbium-doped fiber. By changing the central wavelength of the high-reflection FBG, the tunable wavelength of the output laser was realized, and the tunable range was 0.847 nm (1549.110-1549.957 nm). The proposed laser has the advantages of a lower threshold, shorter cavity length, narrower linewidth, and a relatively simple structure compared with other lasers.
Article
Optics
Colton Fruhling, Kang Wang, Sarah Chowdhury, Xiaohui Xu, Jeffrey Simon, Alexander Kildishev, Letian Dou, Xiangeng Meng, Alexandra Boltasseva, Vladimir M. Shalaev
Summary: Coherent random lasing in subwavelength quasi-2D perovskite films is observed and studied. Statistical analysis reveals Levy-like intensity fluctuations, replica symmetry breaking confirms random lasing, and spectral and spatial correlation techniques are used to study coherent modes. The observed coherent lasing modes are extended states that result from the random crystal grain structure during fabrication and out-compete diffusive lasing due to their coherence.
LASER & PHOTONICS REVIEWS
(2023)
Article
Multidisciplinary Sciences
Yun Li, Girish Lakhwani
Summary: Lasing is observed in Bragg lasers formed through conformal contact of a patterned PDMS stamp with a plain active film on glass. The thresholds and output efficiencies of these lasers are compared to standard substrate patterned gratings and discussed in relation to the coupling coefficient. The PDMS-air lasers exhibit higher thresholds and higher slope output efficiencies compared to substrate-film lasers, and can be used for laser metrology and practical applications.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
Ilka Kriegel, Francesco Scotognella
Summary: This work provides a brief review of polymeric and nanoparticle-based multilayer photonic crystals fabricated on flexible substrates, discussing the feasibility of using the transfer matrix method to analyze their optical properties. An algorithm of the transfer matrix method in three different programming languages is included, along with examples of polymeric and inorganic photonic crystals and discussions on applications such as sensing and light emission control.
Article
Biophysics
Thomas D. P. Allsop, Ronald Neal, Changle Wang, David A. Nagel, Anna V. Hine, Philip Culverhouse, Juan D. Ania Castanon, David J. Webb, Simona Scarano, Maria Minunni
BIOSENSORS & BIOELECTRONICS
(2019)
Article
Chemistry, Multidisciplinary
P. Rosa, G. Rizzelli, X. Pang, O. Ozolins, A. Udalcovs, M. Tan, M. Jaworski, M. Marciniak, S. Sergeyev, R. Schatz, G. Jacobsen, S. Popov, J. D. Ania-Castanon
APPLIED SCIENCES-BASEL
(2020)
Article
Optics
J. Nuno, C. Finot, J. Fatome
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2020)
Article
Optics
Sergio Rota-Rodrigo, Giuseppe Rizzelli, Daniel Leandro, J. Nuno, Manuel Lopez-Amo, Giorgio Santarelli, Juan Diego Ania-Castanon
Article
Engineering, Electrical & Electronic
Javier Nuno, Hugo F. Martins, Sonia Martin-Lopez, Juan D. Ania-Castanon, Miguel Gonzalez-Herraez
Summary: In this article, a new approach is proposed using Raman amplification with engineered intensity modulation to provide close to perfect loss compensation along the fibre length. By optimizing the pump modulation profile, a flat optical trace along 50 km of fibre with minimal SNR penalty is experimentally demonstrated. Thanks to this new approach, sensitivity in the worst point is considerably better and the ASD noise floor is also reduced.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
F. Gallazzi, M. Jimenez-Rodriguez, E. Monroy, P. Corredera, M. Gonzalez-Herraez, F. B. Naranjo, J. D. Ania Castanon
Summary: This research demonstrates the experimental realization of a simple passive ultrafast harmonically mode-locked ultralong ring fiber laser architecture using InN-based SESAMs. The generated ultrashort pulses have high peak power without the need for external amplification stages, meeting the requirements for high peak power demanding applications such as materials processing.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Optics
Javier Nuno, Sonia Martin-Lopez, Juan D. Ania-Castanon, Miguel Gonzalez-Herraez, Hugo F. Martins
Summary: This paper introduces a novel technique that combines Raman amplification with second order Raman pumping scheme to expand the measurement range of sensors, with numerical analysis and experimental validation. Through this new approach, sensor sensitivity is improved, noise floor is reduced, and the measurement range is extended by approximately 15 km compared to the first order pumping case.
Review
Chemistry, Analytical
Mingming Tan, Pawel Rosa, Tu T. Nguyen, Mohammad A. Z. Al-Khateeb, Md. Asif Iqbal, Tianhua Xu, Feng Wen, Juan D. Ania-Castanon, Andrew D. Ellis
Summary: This paper reviews different designs of distributed Raman amplifiers proposed to minimize the signal power profile asymmetry in mid-link optical phase conjugation systems. The paper demonstrates how symmetrical signal power profiles can be achieved using various distributed Raman amplification techniques, both in single-span and multi-span scenarios. Additionally, the paper shows the predicted reduction in Kerr nonlinear product and performance in in-line/long-haul transmission using numerical simulations.
Article
Optics
Francesca Gallazzi, Ines Caceres, Laura Monroy, Javier Nuno, Concepcion Pulido, Pedro Corredera, Fernando B. Naranjo, Miguel Gonzalez-Herraez, Juan Diego Ania Castanon
Summary: The application of a recently demonstrated mode-locked ultralong pulsed fibre ring laser architecture (Gallazzi et al., 2021) for generating supercontinuum from a pulsed output at 1.56 mu m in standard single-mode telecommunication fibre was experimentally demonstrated. The impact of broadening fibre, dynamic switching between different harmonic modes, and the influence of laser polarization on the properties of the generated supercontinuum were studied for three different kinds of telecommunication fibre. Flexible spectral broadening beyond 200 nm was obtained with good temporal correlation and pulse compression from 240 fs down to 50 fs.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Thomas Allsop, Mohammed Al Araimi, Ron Neal, Changle Wang, Phil Culverhouse, Juan D. Ania-Castanon, David J. Webb, Paul Davey, James M. Gilbert, Alex Rozhin
NANOSCALE ADVANCES
(2020)
Article
Physics, Multidisciplinary
J. Nuno, C. Finot, G. Xu, G. Millot, M. Erkintalo, J. Fatome
COMMUNICATIONS PHYSICS
(2019)
