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https://www.readbyqxmd.com/read/28522872/integrated-multi-port-circulators-for-unidirectional-optical-information-transport
#1
Parinaz Aleahmad, Mercedeh Khajavikhan, Demetrios Christodoulides, Patrick LiKamWa
On-chip photonic networks hold great promise for enabling next-generation high speed computation and communication systems. It is currently envisioned that future integrated photonic networks will be capable of processing dense digital information on a single monolithic platform by involving a multitude of optical components ranging from lasers to modulators, to routers, interconnects and detectors. Among the possible functionalities to be incorporated in such arrangements is the ability to route information in a unidirectional way among N-ports - a capability typically afforded through the use of optical circulators...
May 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28504745/16%C3%A2-%C3%A2-mhz-wavelength-swept-and-wavelength-stepped-laser-architectures-based-on-stretched-pulse-active-mode-locking-with-a-single-continuously-chirped-fiber-bragg-grating
#2
Reza Khazaeinezhad, Meena Siddiqui, Benjamin J Vakoc
We demonstrate a novel high-speed and broadband laser architecture based on stretched pulse active mode locking that provides a wavelength-swept and wavelength-stepped output. The laser utilizes a single intracavity 8.3 meter chirped fiber Bragg grating to generate positive and negative dispersion, and can be operated with or without an intracavity fixed Fabry-Perot etalon to generate wavelength-swept and wavelength-stepped (frequency comb) outputs, respectively. Using a four-path delay line at the output, we achieved 16...
May 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28498377/broadband-ultrafast-photovoltaic-detectors-based-on-large-scale-topological-insulator-sb2te3-sto-heterostructures
#3
Honghui Sun, Tian Jiang, Yunyi Zang, Xin Zheng, Yan Gong, Yong Yan, Zhongjie Xu, Yu Liu, Liang Fang, Xiang'ai Cheng, Ke He
Topological insulators (TIs) are new states of quantum matter in which the spin-momentum-locked surface states reside in the bulk insulating gap and have triggered extensive investigations on fundamental properties and potential applications. Herein, we report scalable, broadband photovoltaic detectors based on the topological insulator Sb2Te3/strontium titanate (STO) heterostructure. Large-scale (2 mm × 5 mm), high crystalline quality p-type Sb2Te3 films were fabricated on an n-type STO substrate by the molecular beam epitaxy (MBE) method...
May 12, 2017: Nanoscale
https://www.readbyqxmd.com/read/28468425/improving-the-detection-limit-for-on-chip-photonic-sensors-based-on-subwavelength-grating-racetrack-resonators
#4
Lijun Huang, Hai Yan, Xiaochuan Xu, Swapnajit Chakravarty, Naimei Tang, Huiping Tian, Ray T Chen
Compared to the conventional strip waveguide microring resonators, subwavelength grating (SWG) waveguide microring resonators have better sensitivity and lower detection limit due to the enhanced photon-analyte interaction. As sensors, especially biosensors, are usually used in absorptive ambient environment, it is very challenging to further improve the detection limit of the SWG ring resonator by simply increasing the sensitivity. The high sensitivity resulted from larger mode-analyte overlap also brings significant absorption loss, which deteriorates the quality factor of the resonator...
May 1, 2017: Optics Express
https://www.readbyqxmd.com/read/28468412/helical-long-period-grating-manufactured-with-a-co-sub-2-sub-laser-on-multicore-fiber
#5
Shen Xiang, Hu Xiongwei, Yang Luyun, Dai Nengli, Wu Jianjun, Zhang Fangfang, Peng Jingang, Li Haiqing, Li Jinyan
We have demonstrated a helical long-period grating (HLPG) manufactured from multicore fiber (MCF) combined with twist and CO<sub>2</sub>-laser heating technology. The MCF we used behaves as a kind of single mode fiber. The nineteen cores of MCF are distributed hexagonally which make the helical structure only exist in core area after heating and twisting. There are several strong couplings between the core and cladding modes at different wavelengths when the grating pitch was 900 µm. The extinction ratio of the main coupling reached 20 dB at 1550 nm...
May 1, 2017: Optics Express
https://www.readbyqxmd.com/read/28468370/nanoscale-modeling-of-electro-plasmonic-tunable-devices-for-modulators-and-metasurfaces
#6
Christoph A Riedel, Kai Sun, Otto L Muskens, C H de Groot
The interest in plasmonic electro-optical modulators with nanoscale footprint and ultrafast low-energy performance has generated a demand for precise multiphysics modeling of the electrical and optical properties of plasmonic nanostructures. We perform combined simulations that account for the interaction of highly confined nearfields with charge accumulation and depletion on the nanoscale. Validation of our numerical model is done by comparison to a recently published reflective meta-absorber. The simulations show excellent agreement to the experimental mid-infrared data...
May 1, 2017: Optics Express
https://www.readbyqxmd.com/read/28468356/group-velocity-dispersion-in-soi-based-channel-waveguides-with-reduced-height
#7
Riccardo Marchetti, Valerio Vitali, Cosimo Lacava, Ilaria Cristiani, Benoit Charbonnier, Viviane Muffato, Maryse Fournier, Paolo Minzioni
We report on the experimental characterization, in the telecom C-band, of group-velocity dispersion (D) in 100-nm high rectangular strip waveguides realized by silicon-on-insulator technology. We compare the experimental results with numerical predictions, showing that 100-nm high waveguides exhibit normal dispersion and that the absolute value of the dispersion coefficient D decreases as the waveguide width is increased. D at 1550 nm varies from -8130 to -3900 ps/(nm·km) by increasing the waveguide width from 500 to 800 nm...
May 1, 2017: Optics Express
https://www.readbyqxmd.com/read/28466198/combination-laser-treatment-for-immediate-post-surgical-scars-a-retrospective-analysis-of-33-immature-scars
#8
Yongsoo Lee, Wooram Kim
The application of laser treatments beginning on the day of stitch removal has been demonstrated to improve scar quality. However, there are few guidelines for the treatment of immature scars (ISs), which are defined as "scars whose features are not yet expressed." The purpose of this study was to extract information about early combination laser treatment (CLT) beyond what is currently known by analyzing 33 pairs of pre-treatment and post-treatment photographs of ISs. Two hundred fifty medical records of patients with scars were reviewed, and 33 scars were included in the study...
May 2, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28445995/microstructure-of-spark-plasma-sintered-silicon-nitride-ceramics
#9
O A Lukianova, V Yu Novikov, A A Parkhomenko, V V Sirota, V V Krasilnikov
The microstructure and phase composition of the high-content Al2O3-Y2O3-doped spark plasma-sintered silicon nitride were investigated. Fully dense silicon nitride ceramics with a typical α-Si3N4 equiaxed structure with average grain size from 200 to 530 nm, high elastic modulus of 288 GPa, and high hardness of 2038 HV were spark plasma sintered (SPSed) at 1550 °C. Silicon nitride with elongated β-Si3N4 grains, higher hardness of 1800 HV, density of 3.25 g/cm(3), and Young's modulus 300 GPa SPSed at 1650 °C was also reviewed...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28437982/versatile-supercontinuum-generation-in-parabolic-multimode-optical-fibers
#10
M A Eftekhar, L G Wright, M S Mills, M Kolesik, R Amezcua Correa, F W Wise, D N Christodoulides
We demonstrate that the pump's spatial input profile can provide additional degrees of freedom in tailoring at will the nonlinear dynamics and the ensuing spectral content of supercontinuum generation in highly multimoded optical fibers. Experiments and simulations carried out at 1550 nm indicate that the modal composition of the input beam can substantially alter the soliton fission process as well as the resulting Raman and dispersive wave generation that eventually lead to supercontinuum in such a multimode environment...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437931/circular-core-single-mode-polymer-optical-waveguide-fabricated-using-the-mosquito-method-with-low-loss-at-1310-1550-nm
#11
Kazuki Yasuhara, Feng Yu, Takaaki Ishigure
We fabricate low-loss single-mode (SM) polymer optical waveguides using a photomask-free simple technique named the Mosquito method. The insertion losses of a 5-cm long SM polymer waveguide fabricated are 2.52 dB and 4.03 dB at 1310- and 1550-nm wavelengths, respectively. The coupling loss between a single-mode fiber and the waveguide is as low as 0.5 dB including the Fresnel reflection. The 0.5-dB misalignment tolerance in the radial direction is ± 2.0 μm at 1550 nm. The Mosquito method is promising for fabricating SM polymer optical waveguides compatible with silicon photonics chips...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28430253/nanoscale-schottky-contact-surface-plasmon-point-detectors-for-optical-beam-scanning-applications
#12
Naema Othman, Pierre Berini
We propose and investigate a Schottky contact detector where the contact metal is a nanoscale metal stripe waveguide supporting surface plasmons with strong localization along the Schottky contact. We consider Au for the metal stripe, p-doped silicon for the semiconductor, operation in the infrared (at λ<sub>0</sub>=1550  nm), and internal photoemission as the sub-bandgap detection mechanism. We find that the main surface plasmon mode of operation of the Au stripe exhibits diverging real and imaginary parts of n<sub>eff</sub> with decreasing stripe dimensions, commensurate with increasing confinement...
April 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28430230/compact-multichannel-high-resolution-micro-electro-mechanical-systems-based-interrogator-for-fiber-bragg-grating-sensing
#13
D Ganziy, B Rose, O Bang
We propose a novel type of compact high-resolution multichannel micro-electro-mechanical systems (MEMS)-based interrogator, where we replace the linear detector with a digital micromirror device (DMD). The DMD is typically cheaper and has better pixel sampling than an InGaAs detector used in the 1550 nm range, which leads to cost reduction and better performance. Moreover, the DMD is a 2D array, which means that multichannel systems can be implemented without any additional optical components in the interrogator...
April 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28409793/diamond-ring-fiber-for-evanescent-field-exposure
#14
Wee Lit Ng, Wei Ru Wong, Ghafour Amouzad Mahdiraji, Ahmmed A Rifat, Din Chai Tee, Faisal Rafiq Mahamd Adikan
Diamond Ring Fiber (DRF) is proposed to allow a high percentage of evanescent field exposure while maintaining low confinement loss. It provides a long and protected medium for light-matter interaction and large cavities to ease the infiltration of sensing elements. DRFs with different waveguide parameters have been analyzed theoretically and fabricated using a stack-and-draw fiber drawing technique. Mode analysis has been performed experimentally on the fabricated fibers, while the confinement loss and the percentage of evanescent field exposure are examined by simulation...
April 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28409776/robust-low-noise-polarization-maintaining-mode-locked-er-fiber-laser-with-a-planar-lightwave-circuit-plc-device-as-a-multi-functional-element
#15
Chur Kim, Dohyeon Kwon, Dohyun Kim, Sun Young Choi, Sang Jun Cha, Ki Sun Choi, Dong-Il Yeom, Fabian Rotermund, Jungwon Kim
We demonstrate a new planar lightwave circuit (PLC)-based device, integrated with a 980/1550 wavelength division multiplexer, an evanescent-field-interaction-based saturable absorber, and an output tap coupler, which can be employed as a multi-functional element in mode-locked fiber lasers. Using this multi-functional PLC device, we demonstrate a simple, robust, low-noise, and polarization-maintaining mode-locked Er-fiber laser. The measured full-width at half-maximum bandwidth is 6 nm centered at 1555 nm, corresponding to 217 fs transform-limited pulse duration...
April 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28408758/super-tunable-broadband-up-conversion-of-a-high-power-cw-laser-in-an-engineered-nonlinear-crystal
#16
Ameneh Bostani, Amirhossein Tehranchi, Raman Kashyap
A specially-designed chirped periodically poled lithium niobate nonlinear crystal was fabricated with a phase-matching bandwidth as large as 50 nm for sum frequency generation to operate at room and higher temperatures. This device also benefits from insensitivity to laser frequency drift and fine alignment. The loosely-focused beam position of a high-power CW laser at around 1550 nm is optimized within the grating for maximum up-conversion efficiency, to realize a super-tunable source in the range of 770-778 nm by tuning a narrowband control signal over 30 nm in the communication band...
April 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28380832/64-gb-s-pam4-vcsel-based-fso-link
#17
Hai-Han Lu, Chung-Yi Li, Chun-Ming Ho, Ming-Te Cheng, Xin-Yao Lin, Zih-Yi Yang, Hwan-Wei Chen
A 64 Gb/s four-level pulse amplitude modulation (PAM4) vertical-cavity surface-emitting laser (VCSEL)-based free-space optical (FSO) link with an external light injection scheme is proposed and successfully demonstrated. Experimental results show that the 11.2 GHz VCSEL with an external light injection scheme is sufficiently powerful for 64 Gb/s PAM4 FSO links. This study is the first one that adopts a 1550-nm VCSEL transmitter with an external light injection scheme in a 64 Gb/s PAM4 FSO link. The link performances of the proposed PAM4 VCSEL-based FSO links have been analyzed in real-time in terms of eye diagrams and offline processed by Matlab in terms of bit error rate (BER) performances...
March 6, 2017: Optics Express
https://www.readbyqxmd.com/read/28380802/reduced-graphene-oxide-wrapped-on-microfiber-and-its-light-control-light-characteristics
#18
Dongquan Li, Zhe Chen, Guanglei Chen, Si Hu, Yiting Wang, Wentao Qiu, Jiangli Dong, Jianhui Yu, Jun Zhang, Jieyuan Tang, Yunhan Luo, Heyuan Guan, Huihui Lu
Reduced graphene oxide (rGO) sheet wrapped on the tapered region of microfiber is demonstrated to enhance the interaction between rGO and strong evanescent field of optical fiber. The 405 nm and 980 nm lasers are employed to illuminate the rGO to investigate the response characteristics of the optical transmitted power (λ = 1550 nm) in the MF. The transmitted optical power of the MF with rGO changes with ~1.7 dB relative variation when the violet light is ranging from 0 mW to 12 mW (~0.21dB/mW) in the outside-pumped experiment...
March 6, 2017: Optics Express
https://www.readbyqxmd.com/read/28375342/refractometric-detection-of-liquids-using-tapered-optical-fiber-and-suspended-core-microstructured-fiber-a-comparison-of-methods
#19
T Martan, T Nemecek, M Komanec, R Ahmad, S Zvanovec
Detecting explosive, flammable, or toxic industrial liquids reliably and accurately is a matter of civic responsibility that cannot be treated lightly. Tapered optical fibers (TOFs) and suspended core microstructured optical fibers (SC MOFs) were separately used as sensors of liquids without being compared to each other. We present a highly sensitive time-stable TOF sensor incorporated in the pipeline system for the in-line regime of measurement. This paper is furthermore focused on the comparison of this TOF and SC MOF of similar parameters for the detection of selected liquids...
March 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28375270/mid-infrared-transmitter-and-receiver-modules-for-free-space-optical-communication
#20
Qiang Hao, Guoshen Zhu, Song Yang, Kangwen Yang, Tao Duan, Xiaoping Xie, Kun Huang, Heping Zeng
We report on the experimental implementation of single-frequency fiber-laser pumped mid-infrared (mid-IR) transmitter and receiver modules for free-space communications. These modules enable frequency upconversion and downconversion between the 1550-nm telecom wavelength and the mid-IR, thus providing essential free-space transmission links with mid-IR single-frequency lasers in the 3.6 μm region. Specifically, based on difference frequency generation (DFG) in MgO-doped periodically poled LiNbO<sub>3</sub> (MgO:PPLN), the mid-IR transmitter produces 9...
March 10, 2017: Applied Optics
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