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Articles 1 to 20 of 143 Next Page >>

April


Stable fiber delivery of radio-frequency signal based on passive phase correction

  • Shilong Pan, Fangzheng Zhang, Yonggang Zhou, and Juan Wei
  • received 01/28/2014; accepted 04/22/2014; posted 04/22/2014; Doc. ID 205540
  • [full text: PDF (612) KB)]
  • Abstract: A novel passive phase correction method for stable fiber transfer of radio-frequency (RF) signal is proposed and demonstrated. By employing only one local oscillator (LO) and two frequency mixers in the local station, an RF signal received by an optical remote antenna unit (RAU) is transmitted to the local station with very small phase jitter. An experiment is performed. When a 6-GHz RF signal is delivered through a 20-km single mode fiber (SMF), effective cancellation of the RF signal’s phase jitter induced by the environmental perturbations is achieved. The residual jitter is less than 1.33 ps (about 0.05 rad). The proposed scheme requires no active mechanism to compensate the fiber-length fluctuations, and is thus compact, cost-effective and easy to implement.

Keywords (OCIS):

  • (070.1170) Fourier optics and signal processing : Analog optical signal processing
  • (350.5030) Other areas of optics : Phase
  • (060.5625) Fiber optics and optical communications : Radio frequency photonics

Stokes Vector Direct Detection for Short Reach Optical Communication

  • Di Che, An Li, Xi Chen, Qian Hu, Yifei Wang, and William Shieh
  • received 03/10/2014; accepted 04/22/2014; posted 04/22/2014; Doc. ID 207879
  • [full text: PDF (488) KB)]
  • Abstract: We propose the Stokes vector direct detection (SV-DD) scheme which simultaneously achieves the receiver phase diversity and the cancellation of photo-detection nonlinearity. An 80-Gb/s single-polarization modulated SV-DD signal is successfully received after 160-km SSMF transmission with 11.64-bit/s/Hz electrical spectrum efficiency.

Keywords (OCIS):

  • (060.2330) Fiber optics and optical communications : Fiber optics communications
  • (060.4080) Fiber optics and optical communications : Modulation

Width and amplitude tunable square-wave pulse in dual-pump passively mode-locked fiber laser

  • Li Mei, Lixin Xu, Guoliang Chen, Xianming Zhang, Chun Gu, Biao Sun, and Anting Wang
  • received 03/17/2014; accepted 04/22/2014; posted 04/22/2014; Doc. ID 208389
  • [full text: PDF (790) KB)]
  • Abstract: We have proposed and demonstrated a figure-8 dual-pump passively mode-locked fiber laser to generate square-wave pulse with both width and amplitude tunable. Just by simply adjusting the power of the pumps, both of the amplitude and width of the output square-wave pulse can be tuned independently and continuously. One pump is used to tune the output pulse width while the other is used to tune amplitude.

Keywords (OCIS):

  • (060.2310) Fiber optics and optical communications : Fiber optics
  • (060.2380) Fiber optics and optical communications : Fiber optics sources and detectors
  • (140.3510) Lasers and laser optics : Lasers, fiber
  • (140.4050) Lasers and laser optics : Mode-locked lasers

Multifocal non-contact color imaging for depth sensitive fluorescence measurements of epithelial cancer

  • Caigang Zhu, Ong Yi Hong, and Quan Liu
  • received 02/25/2014; accepted 04/21/2014; posted 04/22/2014; Doc. ID 207177
  • [full text: PDF (545) KB)]
  • Abstract: We proposed a multi-focal non-contact setup to perform depth sensitive fluorescence imaging on a two-layered tissue model. The combination of a microlens array and a tunable lens enables the depth of the multi-focal plane to be conveniently adjusted without any mechanical movement of the imaging lens or the sample. This advantage is particularly desirable in the clinical setting. Results from the phantom study demonstrated that the setup can achieve depth sensitive color imaging for fluorescence measurements, which was further confirmed by spectral measurements. Color values could be also used to reconstruct full spectra using the previous algorithm for rapid spectral imaging.

Keywords (OCIS):

  • (170.0110) Medical optics and biotechnology : Imaging systems
  • (170.3880) Medical optics and biotechnology : Medical and biological imaging
  • (170.6510) Medical optics and biotechnology : Spectroscopy, tissue diagnostics
  • (170.2945) Medical optics and biotechnology : Illumination design

Grating-Coupled Silicon-on-Sapphire Integrated Slot Waveguides Operating at Mid Infrared Wavelengths

  • yi zou, Swapnajit Chakravarty, Harish Subbaraman, Xiaochuan Xu, Amir Hosseini, Wei-Cheng Lai, parker wray, and Ray Chen
  • received 03/06/2014; accepted 04/21/2014; posted 04/22/2014; Doc. ID 207777
  • [full text: PDF (842) KB)]
  • Abstract: We demonstrate subwavelength bidirectional grating (SWG) coupled slot waveguide fabricated in silicon-on-sapphire for transverse-electric (TE) polarized wave operation at 3.4 µm wavelength. Coupling efficiency of 29% for SWG coupler is experimentally achieved. Propagation loss of 11 dB/cm has been experimentally obtained for slot waveguides. Two-step taper mode converters with an insertion loss of -0.13 dB are used to gradually convert the strip waveguide mode into slot waveguide mode.

Keywords (OCIS):

  • (050.2770) Diffraction and gratings : Gratings
  • (130.3060) Integrated optics : Infrared
  • (130.3120) Integrated optics : Integrated optics devices
  • (230.3120) Optical devices : Integrated optics devices
  • (230.7370) Optical devices : Waveguides
  • (050.6624) Diffraction and gratings : Subwavelength structures

Molecular specificity in photoacoustic microscopy by time-resolved transient absorption

  • Ryan Shelton, Brian Applegate, and Scott Mattison
  • received 01/22/2014; accepted 04/21/2014; posted 04/22/2014; Doc. ID 205063
  • [full text: PDF (1406) KB)]
  • Abstract: We have recently harnessed transient absorption, a resonant two-photon process, for ultrahigh resolution photoacoustic microscopy, achieving nearly an order of magnitude improvement in axial resolution. The axial resolution is optically constrained due to the two-photon process unlike traditional photoacoustic microscopy where the axial resolution is inversely proportional to the frequency bandwidth of the detector. As a resonant process, the arrival time of the two photons need not be instantaneous. Systematically recording the signal as a function of the delay between two pulses will result in the measurement of an exponential decay whose time constant is related to the molecular dynamics. This time constant, analogous to the fluorescence lifetime, but encompassing non-radiative decay as well, can be used to differentiate between molecular systems with overlapping absorption spectra. This is frequently the situation for closely related yet distinct molecules such as redox pairs. In order to enable the measure of the exponential decay, we have reconfigured our transient absorption ultrasonic microscopy (TAUM) system to incorporate two laser sources with precisely controlled pulse streams. The system was tested by measuring Rhodamine 6G, an efficient laser dye where the molecular dynamics are dominated by the fluorescence pathway. As expected, the measured exponential time constant or ground state recovery time, 3.3 +/- 0.7 ns, was similar to the well-known fluorescence lifetime, 4.11 +/- 0.05 ns. Oxy- and deoxy- hemoglobin are the quintessential redox pair whose relative concentration is related to the local blood oxygen saturation. We have measured the ground state recovery times of these two species in fully oxygenated and deoxygenated bovine whole blood to be 3.7 +/- 0.8 ns and 7.9 +/- 1.0 ns, respectively. Hence, even very closely related redox pairs may be differentiated with this technique.

Keywords (OCIS):

  • (170.3650) Medical optics and biotechnology : Lifetime-based sensing
  • (170.5120) Medical optics and biotechnology : Photoacoustic imaging
  • (170.6920) Medical optics and biotechnology : Time-resolved imaging
  • (180.4315) Microscopy : Nonlinear microscopy

Observation of two photon fluorescence of Rhodamine 6G in microbubble resonators

  • Gregory Cohoon, Khanh Kieu, and Robert Norwood
  • received 03/17/2014; accepted 04/20/2014; posted 04/21/2014; Doc. ID 208249
  • [full text: PDF (5897) KB)]
  • Abstract: We report the observation of multiphoton excitation of organic chromophores in microbubble whispering gallery mode resonators. High-Q microbubble resonators are formed by heating a pressurized fused silica capillary to form a hollow bubble which can be filled with liquid. In this case, the microbubble is filled with a solution of Rhodamine 6G dye. The resonator and dye are excited by evanescently coupling continuous wave (CW) light from a 980nm laser diode using a tapered optical fiber. The two-photon fluorescence of the dye can be seen with pump powers as low as 700µW.

Keywords (OCIS):

  • (140.4780) Lasers and laser optics : Optical resonators
  • (190.4180) Nonlinear optics : Multiphoton processes
  • (190.4710) Nonlinear optics : Optical nonlinearities in organic materials
  • (140.3945) Lasers and laser optics : Microcavities

Optically controlled microwave phase shifter based on nonlinear polarization rotation in a highly nonlinear fiber

  • Ninghua Zhu, Wei Li, wenhui sun, and wenting wang
  • received 03/19/2014; accepted 04/20/2014; posted 04/22/2014; Doc. ID 208604
  • [full text: PDF (394) KB)]
  • Abstract: This letter reports an optically controlled microwave phase shifter with an ultra-wideband working bandwidth and a full 360º phase shifting range based on nonlinear polarization rotation (NPR) in a highly nonlinear fiber (HNLF). A continuous wave probe light is modulated by a polarization modulator (PolM) that is driven by a microwave signal to be phase shifted. The optical carrier and the first-order sidebands of the probe light experience different phase shifts due to the NPR induced by the control light in the HNLF. An optical bandpass filter is used to realize single-sideband modulation of the probe light by removing one of the first-order sidebands as well as to reject the control light. After detecting by a photodetector, the phase of the recovered microwave signal is continuously tunable by adjusting the power of the control light. The proposed approach is theoretically analyzed and experimentally verified. A full 360º tunable phase shift is realized over an ultra-wideband frequency range from 8 to 38 GHz when the power of the control light is tuned from 0 to 570 mW.

Keywords (OCIS):

  • (350.4010) Other areas of optics : Microwaves
  • (060.5625) Fiber optics and optical communications : Radio frequency photonics
  • (130.4110) Integrated optics : Modulators

High-brightness single-mode double-tapered laser diodes with laterally coupled high-order surface grating

  • Wan-hua Zheng, Lei Liu, Yufei Wang, Yun Liu, Yejin Zhang, and Hongwei Qu
  • received 03/26/2014; accepted 04/18/2014; posted 04/22/2014; Doc. ID 209005
  • [full text: PDF (1267) KB)]
  • Abstract: Double-tapered laser diodes with 23th order laterally coupled surface gratings are fabricated at 913 nm. Narrow ridge waveguide restricts the lateral mode number, and tapered waveguides are utilized to enhance the output power. The gratings defined on the sides of ridge waveguide filter not only the longitudinal modes but also the high-order lateral modes. Experimentally, continuous wave power of over 560 mW/facet is achieved. The lateral far-field pattern remains single-lobe profiles and narrow divergence, and the lowest divergence angle is only twice the diffraction-limited one. Measured side mode suppression ratio is about 27 dB. This device has great potential for high-power single-mode near-diffraction-limited laser emission with easy fabrication.

Keywords (OCIS):

  • (140.2020) Lasers and laser optics : Diode lasers
  • (140.3570) Lasers and laser optics : Lasers, single-mode
  • (140.3295) Lasers and laser optics : Laser beam characterization

Sub-wavelength microwave electric field imaging using Rydberg atoms inside atomic vapor cells

  • James Shaffer, Harald Kübler, Renate Daschner, Santosh Kumar, and Haoquan Fan
  • received 03/13/2014; accepted 04/18/2014; posted 04/21/2014; Doc. ID 208157
  • [full text: PDF (1820) KB)]
  • Abstract: We have recently shown that Alkali atoms contained in a vapor cell can serve as a highly accurate standard for microwave electric field strength as well as polarization using the principles of Rydberg atom electromagnetically induced transparency. Here, we show, for the first time, that Rydberg atom electromagnetically induced transparency can be used to image microwave electric fields with unprecedented precision. The spatial resolution of the method is far into the sub-wavelength regime. The electric field resolutions are similar to those we have demonstrated in our prior experiments. Our experimental results agree with finite element calculations of test electric field patterns.

Keywords (OCIS):

  • (020.5780) Atomic and molecular physics : Rydberg states
  • (110.0110) Imaging systems : Imaging systems
  • (260.2110) Physical optics : Electromagnetic optics
  • (270.1670) Quantum optics : Coherent optical effects
  • (300.6210) Spectroscopy : Spectroscopy, atomic
  • (350.4010) Other areas of optics : Microwaves

Crystal orientation-dependent of femtosecond laser induced periodic surface structure on (100) Si

  • Lan Jiang, Weina Han, Xiaowei Li, Qingsong Wang, Fantong Meng, and Yongfeng Lu
  • received 03/24/2014; accepted 04/18/2014; posted 04/21/2014; Doc. ID 208766
  • [full text: PDF (676) KB)]
  • Abstract: It is widely believed that laser induced periodic surface structures (LIPSS) are independent on material crystal structures. This paper reports an abnormal phenomenon of strong dependence of the anisotropic formation of periodic ripples on crystal orientation, when Si (100) is processed by linearly polarized femtosecond laser (800 nm, 50 fs, 1 kHz). LIPSS formation sensitivity with a π/2 modulation is found along different crystal orientations with a quasi-cosinusoid-function when the angle between the crystal orientation and polarization direction is changed from 0° to 180°. Our experiments indicate that it is much easier (or more difficult) to form ripple structures when the polarization direction is aligned with the lattice axis [011]/[01 ] (or [001]). The modulated nonlinear ionization rate along different crystal orientations, which arises from the direction dependence of the effective mass of the electron is proposed to interpret the unexpected anisotropic LIPSS formation phenomenon. Also, we demonstrate that the abnormal phenomenon can be applied to control the continuity of scanned ripple lines along different crystal orientations.

Keywords (OCIS):

  • (260.1180) Physical optics : Crystal optics
  • (260.5430) Physical optics : Polarization
  • (320.2250) Ultrafast optics : Femtosecond phenomena

High Power Beam Transport through Hollow Core Photonic Bandgap Fiber

  • Charlotte Bennett, David Jones, Mark Smith, and Andrew Scott
  • received 03/17/2014; accepted 04/18/2014; posted 04/18/2014; Doc. ID 206754
  • [full text: PDF (430) KB)]
  • Abstract: We investigate the use of 7-cell hollow core photonic band-gap fiber for transport of CW laser radiation from a single-mode narrow-linewidth high-power fiber laser amplifier. Over 90% of the amplifier output was successfully coupled and transmitted through the fiber in a near-Gaussian mode with negligible back-reflection into the source. 100 W of power was successfully transmitted continuously without damage and 160 W of power was transmitted briefly before the onset of thermal lensing in the coupling optics.

Keywords (OCIS):

  • (060.2270) Fiber optics and optical communications : Fiber characterization
  • (140.3325) Lasers and laser optics : Laser coupling
  • (060.4005) Fiber optics and optical communications : Microstructured fibers

Second-harmonic generation in AlGaAs microdisks in the telecom range

  • Giuseppe Leo, Silvia Mariani, Alessio Andronico, Aristide Lemaitre, Ivan Favero, and Sara Ducci
  • received 02/24/2014; accepted 04/18/2014; posted 04/18/2014; Doc. ID 207009
  • [full text: PDF (956) KB)]
  • Abstract: We report on second-harmonic generation in whispering-gallery-mode AlGaAs microcavities suspended on a GaAs pedestal. Frequency doubling of a 1.58 μm pump is observed with 7×10-4 W−1 conversion efficiency. This device can be integrated in a monolithic photonic chip for applications in the telecom band.

Keywords (OCIS):

  • (130.5990) Integrated optics : Semiconductors
  • (140.3945) Lasers and laser optics : Microcavities
  • (190.4223) Nonlinear optics : Nonlinear wave mixing

Dynamic control of wideband slow wave in graphene based waveguides

  • Ran Hao, Jia-Min Jin, Xi-Liang Peng, and Erping Li
  • received 02/26/2014; accepted 04/17/2014; posted 04/21/2014; Doc. ID 207183
  • [full text: PDF (1605) KB)]
  • Abstract: Enlarged group index has been reported previously when surface plasmons propagate through the graphene sheet [1], yet a clear slow wave performance in graphene has not been explored. We proposed and numerically analyzed here for the first time an extremely wideband slow surface wave in a graphene-based grating waveguide. The strongly delayed wave (120< ng<167) with extremely large bandwidth (2.7THz>△f>0.7THz) can be dynamically controlled via the gate-voltage dependent optical property of graphene. Our results suggest that graphene may be a very promising slow light medium, promoting future slow light devices based on graphene.

Keywords (OCIS):

  • (160.3130) Materials : Integrated optics materials
  • (210.4680) Optical data storage : Optical memories
  • (230.3120) Optical devices : Integrated optics devices
  • (230.7370) Optical devices : Waveguides
  • (240.6680) Optics at surfaces : Surface plasmons

Narrow-line magneto-optical trap for dysprosium atoms

  • Holger Kadau, Thomas Maier, Matthias Schmitt, Axel Griesmaier, and Tilman Pfau
  • received 03/06/2014; accepted 04/17/2014; posted 04/21/2014; Doc. ID 207809
  • [full text: PDF (416) KB)]
  • Abstract: We present our technique to create a magneto-optical trap for dysprosium atoms using the narrow-line cooling transition at 626 nm to achieve suitable conditions for direct loading into an optical dipole trap. The magneto-optical trap is loaded from an atomic beam via a Zeeman slower using the strongest atomic transition at 421 nm. With this combination of two cooling transitions we can trap up to 2.0 · 10⁸ atoms at temperatures down to 6 µK. This cooling approach is simpler than present work with ultracold dysprosium and provides similar starting conditions for a transfer to an optical dipole trap.

Keywords (OCIS):

  • (020.0020) Atomic and molecular physics : Atomic and molecular physics
  • (020.7010) Atomic and molecular physics : Laser trapping
  • (020.3320) Atomic and molecular physics : Laser cooling

Enhanced broadband excited upconversion luminescence in Ho-doped glasses by codoping with bismuth

  • bei Xu, Gongxun Bai, Juechen Wang, Qiangbing Guo, Weibo Chen, Xiaofeng Liu, shifeng zhou, Jianhua Hao, Jianrong Qiu, and Dezhi Tan
  • received 02/19/2014; accepted 04/17/2014; posted 04/18/2014; Doc. ID 206775
  • [full text: PDF (662) KB)]
  • Abstract: We report greatly enhanced green and red upconversion luminescence in Ho3+-doped oxyfluoride germanate glass by introducing bismuth near-infrared active centers as sensitizers. The upconversion excitation bands at 750 and 970 nm show a full width at half maximum of 20 and 45 nm, respectively. Energy transfer from sensitizers, the excited-state absorption, and phonon-coupled absorption of Ho3+ jointly contribute to the enhanced upconversion luminescence. Our approach provides an efficient methodology to broaden the excitation bandwidth of upconversion luminescent materials, which may have promising application in solar cells.

Keywords (OCIS):

  • (040.5350) Detectors : Photovoltaic
  • (160.2540) Materials : Fluorescent and luminescent materials
  • (190.7220) Nonlinear optics : Upconversion

Optically controlled background-free terahertz switching in chiral metamaterial

  • Jin-hui Shi, tingting Lv, zheng zhu, Chunying Guan, Zhengping Wang, and Tie Jun Cui
  • received 02/21/2014; accepted 04/17/2014; posted 04/18/2014; Doc. ID 206887
  • [full text: PDF (1499) KB)]
  • Abstract: We demonstrate a multi-band background-free terahertz (THz) switch in photoactive chiral metamaterial using polarization conversion. Orthogonal arrangement of two asymmetrically split-ring apertures allows a high polarization conversion efficiency and low co-polarization transmission. The chiral metamaterial embedded with photoactive silicon promises a dynamic control on cross-polarization transmission and thus enables efficient background-free THz switch. The on/off state of THz metamaterial switching can be efficiently controlled by optical pump. The realization of cross-polarization THz switch provides a new mechanism of mode switching to control THz wave propagation and will be a promising candidate for polarization devices.

Keywords (OCIS):

  • (260.5150) Physical optics : Photoconductivity
  • (260.5430) Physical optics : Polarization
  • (160.1585) Materials : Chiral media
  • (160.3918) Materials : Metamaterials

Polymer optical microstructured fiber with birefringence induced by stress applying elements

  • Pawel Mergo, Tadeusz Martynkien, and Waclaw Urbanczyk
  • received 03/14/2014; accepted 04/17/2014; posted 04/17/2014; Doc. ID 208324
  • [full text: PDF (1854) KB)]
  • Abstract: We report on the fabrication of a birefringent microstructured PMMA fiber with polystyrene stress applying elements located in the solid part of the cladding. A microstructured part of the cladding composed of three rings of holes was made of We report on the fabrication of a birefringent microstructured PMMA fiber with polystyrene stress applying elements located in the solid part of the cladding. A microstructured part of the cladding composed of three rings of holes was made of a technical grade PMMA by a drilling method. The fiber shows relatively high birefringence of the order of 4x10-5, which weakly depends upon wavelength in the investigated spectral range from 0.6 to 1μm. The cross-talk between polarization modes is lower than 20 dB for a 1m long fiber, while the fiber loss is about 8dB/m at 0.83μm. We also studied the fiber response to temperature in the range from 20 to 60 °C. The temperature induced birefringence change is negative and shows significant hysteresis in the first cycle which gradually disappears in successive cycles. a technical grade PMMA by a drilling method. The fiber shows relatively high birefringence of the order of 4x10-5, which weakly depends upon wavelength in the investigated spectral range from 0.6 to 1μm. The cross-talk between polarization modes is lower than 20 dB for a 1m long fiber, while the fiber loss is about 8dB/m at 0.83μm. We also studied the fiber response to temperature in the range from 20 to 60 °C. The temperature induced birefringence change is negative and shows significant hysteresis in the first cycle which gradually disappears in successive cycles.

Keywords (OCIS):

  • (060.2270) Fiber optics and optical communications : Fiber characterization
  • (060.2280) Fiber optics and optical communications : Fiber design and fabrication
  • (060.2420) Fiber optics and optical communications : Fibers, polarization-maintaining
  • (060.5295) Fiber optics and optical communications : Photonic crystal fibers
  • (130.5460) Integrated optics : Polymer waveguides

Dual-mode imaging system for fluorescence image-guided surgery

  • Rongguang Liang, Nan Zhu, Suman Mondal, Shengkui Gao, Viktor Gruev, and Samuel Achilefu
  • received 04/01/2014; accepted 04/17/2014; posted 04/21/2014; Doc. ID 209201
  • [full text: PDF (1770) KB)]
  • Abstract: In this letter we present a novel imaging concept that a single imaging system can image different spectral bands with different aperture sizes. It is achieved by using a filter with different transmitted spectral bands in different annular rings as the aperture stop. This concept will enable novel system configurations and applications. We have demonstrated this concept with a dual-mode image guided surgical system. © 2014 Optical Society of America

Keywords (OCIS):

  • (120.4570) Instrumentation, measurement, and metrology : Optical design of instruments
  • (170.0110) Medical optics and biotechnology : Imaging systems
  • (170.3890) Medical optics and biotechnology : Medical optics instrumentation

Robust and accurate transient light transport decomposition via convolutional sparse coding

  • Xuemei Hu, Qionghai Dai, Christopher Barsi, Xing Lin, Jinli Suo, Ramesh Raskar, and Deng Yue
  • received 01/16/2014; accepted 04/16/2014; posted 04/18/2014; Doc. ID 204602
  • [full text: PDF (2268) KB)]
  • Abstract: Ultrafast sources and detectors have been used to record the time-resolved scattering of light propagating through macroscopic scenes. In the context of computational imaging, decomposition of this transient light transport is useful for applications such as characterizing materials, imaging through diffuser layers, and relighting scenes dynamically. Here we demonstrate a method of convolutional sparse decomposition to decompose transient light transport into direct reflections, inter-reflections, and subsurface scattering. The method relies on the sparsity of the time-resolved kernel. We show that it is robust and accurate to noise during the acquisition process.

Keywords (OCIS):

  • (100.3190) Image processing : Inverse problems
  • (150.1135) Machine vision : Algorithms
  • (070.2025) Fourier optics and signal processing : Discrete optical signal processing

Articles 1 to 20 of 143 Next Page >>





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