IEEE Photonics Technology Letters

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ISSN / EISSN : 1041-1135 / 1941-0174
Total articles ≅ 18,827
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Yibin Wan, , Jianxin Ren, Rahat Ullah, Yaya Mao, ShuaiDong Chen, Haojing Zhang, Shun Han, Xiumin Song, Tong Nan, et al.
IEEE Photonics Technology Letters, pp 1-1; https://doi.org/10.1109/lpt.2021.3120664

Abstract:
This paper proposes and experimentally demonstrates an orthogonal frequency division multiplexing wavelength division multiplexing passive optical network (OFDM-WDM-PON) system based on novel chaotic set-partitioned selective mapping (SP-SLM) scheme. With the implementation of a three-dimensional chaotic system, peak-to-average power ratio (PAPR) reduction and chaotic encryption are simultaneously realized on the process of OFDM signal modulation, so as to enhance the system performance in the presence of PAPR, bit error rate (BER), fiber nonlinear tolerance and security. The experimental results show that, when compared with original OFDM signal, the OFDM signal with SP-SLM can achieve 4 dB PAPR reduction at the complementary cumulative distribution function value of 10-4, as well as a 1.1 dB gain in receiver sensitivity at a BER of 10-3 after transmission over 25 km standard single mode fiber (SSMF). For fiber nonlinear tolerance, the optimal launch fiber power of OFDM signal with SP-SLM is 10 dBm, which is better than 9 dBm of original OFDM signal under the same received optical power of -16 dBm. Furthermore, the key space of the proposed scheme can reach up to 1098, which is large enough to effectively protect against illegal attackers.
IEEE Photonics Technology Letters, Volume 33, pp 1221-1222; https://doi.org/10.1109/lpt.2021.3115857

Abstract:
Presents the table of contents for this issue of the publication.
, Mohammadreza Sanadgol Nezami,
IEEE Photonics Technology Letters, Volume 33, pp 1313-1316; https://doi.org/10.1109/lpt.2021.3119920

Abstract:
The multimode characteristics of vertical cavity surface emitting laser (VCSEL) sources lead to mode partition noise (MPN) impairing high-speed multimode fiber (MMF) links. In this letter, we propose a low-cost and straightforward MPN mitigation scheme by optimizing the launch condition between the VCSEL and the MMF. The dependence of the MPN on launch conditions is theoretically assessed. Simulation shows that the mode power redistribution induced by rearranging the launch condition has great potential to reduce the MPN. Experiments are carried out to demonstrate the MPN reduction. In our case, using a 15-μm radial offset between the VCSEL and the MMF, we observe efficient noise suppression in both the frequency domain and the time domain.
, Andrea Carena, Paulo P. Monteiro, Fernando P. Guiomar
IEEE Photonics Technology Letters, pp 1-1; https://doi.org/10.1109/lpt.2021.3120074

Abstract:
This letter reports a novel approach for nonlinear phase noise mitigation, based on artificial neural networks (ANNs) tailored to classification applications and a pre-processing stage of feature engineering. Starting with a set of proof-of-concept simulations, we verify that the proposed system can achieve optimal performance for the additive white Gaussian noise (AWGN) channel. Then, considering a dispersion-less channel with strong nonlinear phase noise (NLPN) distortion, we demonstrate a Q-factor increase of 0.4 dB, comparing with standard carrier-phase estimation (CPE) followed by minimum distance detection. Finally, simulating the propagation of 64 Gbaud PM-16QAM over standard single mode fiber (SSMF), we verify that the ANN-based solution is effective on wavelength-division multiplexing (WDM) transmission conditions, enabling to increase the maximum signal reach by approximately 1 fiber span over the legacy CPE-enabled NLPN compensation.
Pan Dai, Zhenxing Sun, Zhuo Chen, Jun Lu, Feng Wang, Hua Tong, Rulei Xiao, Xiangfei Chen
IEEE Photonics Technology Letters, pp 1-1; https://doi.org/10.1109/lpt.2021.3119710

Abstract:
In this study, a tunable in-series multi-wavelength distributed feedback laser array (DFB-MLA) based on reconstruction-equivalent-chirp (REC) technique with simple wavelength tuning scheme is presented and experimentally demonstrated. Unlike traditional DFB laser tuned by thermal-electric cooler (TEC), the proposed laser tuned by injection current can realize faster wavelength-tuning and reduce TEC power consumption. By comparing the thermal influence of different structures of heatsink blocks, several optimized block structures are selected for appropriate thermal conductivity and controllable heat dissipation, resulting in a broad and continuous wavelength tuning range. The proposed in-series DFB-MLA on optimized heatsink achieves better tuning performance with a wavelength tuning range of ~ 2.4 nm per channel from 40 to 120 mA and stable output power of over 20 mW compared to the laser mounted on the standard heatsink block with the tuning range of 1.4 nm per channel. Furthermore, the tunable laser keeps good single-mode stability, with a side mode suppressing ratio (SMSR) of over 40 dB. Thus, this study provides a new perspective for designing a low-cost continuous tunable semiconductor laser with a simple tuning mechanism in the future.
E. M. Sheta,
IEEE Photonics Technology Letters, pp 1-1; https://doi.org/10.1109/lpt.2021.3119331

Abstract:
Hyperbolic metamaterial (HMM) based absorber comprising metasurface having periodically arranged hafnium nitride nanodisks was investigated. The constitutive and absorption properties of the structure were evaluated considering different parametric and operational conditions. Both the TE- and TM-incidence waves were studied along with different incidence and polarization angles. Using the finite integration technique, the absorber was found to exhibit high (polarization insensitive) ultrawideband absorption. With such features, the proposed HMM has prospects in developing plasmonic devices to enhance solar cell efficiency and other optical applications.
IEEE Photonics Technology Letters, Volume 33; https://doi.org/10.1109/lpt.2021.3100240

Abstract:
Presents the front cover for this issue of the publication.
IEEE Photonics Technology Letters, Volume 33; https://doi.org/10.1109/lpt.2021.3103399

Abstract:
Presents the front cover for this issue of the publication.
, Wei Cao, Manli Hu, ,
IEEE Photonics Technology Letters, Volume 33, pp 1321-1324; https://doi.org/10.1109/lpt.2021.3119351

Abstract:
We here propose and demonstrate a novel “2-in-1” fiber consisting of two freely separated fiber ends and one fiber tip mounted with nanodiamonds (NDs) containing nitrogen vacancy (NV) centers. The fiber tip with ball lens is fabricated by fusing two parallel multimode fiber with arcing discharge. The excitation and collection of the integrated NV centers through the two fiber ends, can be optimized by manipulating the fabricated lens. We also demonstrate the feasibility of all-optical thermometry using this device. This endoscopy-like probe paves the way for developing fiber-based quantum device for flexible thermometry and magnetometry.
Ming Chen, Aitao Deng, Long Zhang, Ruizi Li, Jing Yang, Hui Zhou, Qinghui Chen, Yun Cheng
IEEE Photonics Technology Letters, Volume 33, pp 1305-1308; https://doi.org/10.1109/lpt.2021.3118838

Abstract:
Filter bank multicarrier with offset quadrature amplitude modulation (FBMC/OQAM) can provide higher spectral efficiency and lower out-of-band spectral/power leakages than conventional orthogonal frequency-division multiplexing with QAM (OFDM/QAM). Due to the imperfect frequency response of electrical/optical devices and various interferences, significant subcarrier SNR fluctuation may result in poor bit error rate (BER) performance. In this work, channel-independent precoding techniques are employed for the short-reach FBMC/OQAM-based intensity-modulated and direct-detection (IMDD) system. Four commonly used precoding techniques are experimentally investigated in a directly-modulated laser-based IMDD FBMC/OQAM and OFDM/QAM systems over a 20-km fiber link. The relevant results exhibit that the receiver sensitivity of these two systems can be improved by about 2 dB with precoding techniques at the BER of 3.8e-3. A slight BER enhancement can also be achieved by the precoded FBMC/OQAM compared to the precoded OFDM/QAM.
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