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Photonics and Optoelectronics (SOPO), 2011 Symposium on

Date 16-18 May 2011

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Displaying Results 1 - 25 of 245
  • SOPO 2011 [Title page]

    Publication Year: 2011 , Page(s): i
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  • SOPO 2011 [Copyright page]

    Publication Year: 2011 , Page(s): i
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  • SOPO 2011 Welcome Message

    Publication Year: 2011 , Page(s): i
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    Freely Available from IEEE
  • SOPO 2011 Conference Committee

    Publication Year: 2011 , Page(s): i
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  • 1 MW Peak Power, Sub-Nanosecond Master Oscillator Fiber Power Amplifier

    Publication Year: 2011 , Page(s): 1 - 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (304 KB) |  | HTML iconHTML  

    A master oscillator fiber power amplifier system delivering 0.7 ns pulse duration at repetition rates of 6.5 KHz and peak power up to 1 MW has been reported. The system consisting of a passively Q-switched microchip sub-nanosecond laser operating at 1064nm as the master oscillator and an Yb-doped large-mode-area double-clad fiber as the power amplifier shows a high gain of 18 dB and the amplified spontaneous emission suppression is up to 40 dB. The emission spectrum and the output beam quality have also been measured. View full abstract»

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  • 1064nm / 532nm / 660nm Three-Wavelength Laser Generation from LD Side-Pumped Nd:YAG Crystal

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (829 KB) |  | HTML iconHTML  

    1064 nm / 532 nm / 660 nm three wavelength lasers were obtained simultaneously or singly from a novel LD side-pumped Nd: YAG laser system with acousto-optic Q-switched and nonlinear frequency conversion technologies. When the three wavelength lasers output singly and the Pumping power was 103 W, 1064 nm laser was 14.5 W and the green and red laser reached 4.7 W and 1.6 W respectively at the repetition rate of 10.5 kHz and 11.5 kHz. When they operated simultaneously, the red, green and infrared lasers were obtained with the output power distribution of LOW at 660 nm, 4.3 W at 532 nm and 10.1 W at 1064 nm and the instability was less than 2 % within 3 hours. View full abstract»

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  • A 2D-Torus Based Packet Switching Optical Network-on-Chip Architecture

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (366 KB) |  | HTML iconHTML  

    In this paper we present a new optical NoC architecture called GTON-XII. Data transmission in GTON XII is packet switching with different optical wavelengths through micro-ring resonators. Simulation results demonstrate GTON-XII is a high-bandwidth, low-cost, low-latency and low power-consuming architecture. View full abstract»

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  • A Block Components Average Algorithm for Compressed Sensing Based Tomography

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (212 KB) |  | HTML iconHTML  

    The constrained total variation minimization has been developed successfully for image reconstruction in computerized tomography. The convergence of the block cyclic projection and Cimmino algorithms for compressed sensing based tomography have been proved recently. In this paper, a block component averaging algorithm incorporation to the total variation minimization in the compressed sensing framework is proposed. The convergence of the new algorithm is derived in certain case. An example is given to illustrate its convergence behavior. View full abstract»

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  • A Compact Metal Bellows-Based Fiber Bragg Grating Accelerometer for Structural Health Monitoring

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (333 KB) |  | HTML iconHTML  

    A compact metal bellows-based fiber Bragg grating accelerometer is proposed in this paper. The acceleration can be measured by monitoring the center wavelength shift of FBG, which we show is proportional to accelerometer. The experimental results indicate that the FBG accelerometer with a high sensitivity of 567.2pm/g shows a good linear response of the wavelength shifts versus applied acceleration. In addition, it provides a broad flat response over a vibration frequency ranging from 5 to 120Hz. The upper vibration frequency limit of measure is determined by mechanical resonance, and can be tuned by varying the weight of inertial mass. A series of table-shaking tests were conducted and showed good performance of a prototype FBG accelerometer. View full abstract»

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  • A Comparison of Multilayer Medium Thin Film and Long-Period Waveguide Grating Filters for Waveguide Amplifiers

    Publication Year: 2011 , Page(s): 1 - 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (202 KB) |  | HTML iconHTML  

    The performances of multilayer medium thin film (MMTF) and long-period waveguide grating (LPWG) filters are compared and contrasted for the case of optical waveguide amplifiers. The effects of the transmission spectra of the two kinds of filters on the amplified spontaneous emission spectrum of Er-Yb codoped phosphate glass waveguide amplifiers are discussed. The analysis demonstrates that LPWG filters show improved performance compared to MMTF filters. View full abstract»

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  • A DFB-FL Wavelength Shift Interrogating Scheme Based on C2H2 Absorption Spectrum

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (237 KB) |  | HTML iconHTML  

    A Distributed feedback fiber laser (DFB-FL) wavelength shift interrogation scheme based on C2H2 absorption spectrum is demonstrated in this paper, the interrogation scheme takes advantage of the transformation the wavelength shift to intensity change of the light by gas absorption spectrum. Interrogation the wavelength shifting of the DFB-FL by C2H2 absorption line around 1535nm is taken as example. The theory, structure of the systems, resolution analysis is presented in detail. Because gas absorption spectrum is stable, the system based on this interrogation scheme has high precision and stability; it has good prospects in DFB-FL sensor wavelength interrogation system. View full abstract»

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  • A Distributed Sensing System Based on Low-Reflective-Index Bragg Gratings

    Publication Year: 2011 , Page(s): 1 - 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (407 KB) |  | HTML iconHTML  

    By exploiting the low-reflective-index fiber Bragg grating, a distributed optical fiber sensing scheme is proposed, which utilizes tunable laser to demodulate the wavelength information. Experiment on this scheme is also investigated to demonstrate the feasibility. View full abstract»

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  • A FBG Sensor Based on EDFL with Hybrid Edge Filter

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (343 KB) |  | HTML iconHTML  

    A FBG sensor that uses an Erbium doped fiber laser (EDFL) has been demonstrated. The mode selecting component, FBG, also acts as the sensing element. A High Birefringence Fiber Loop Mirror (Hi-Bi FLM) was used to form the linear laser cavity with FBG. Furthermore, the Hi-Bi FLM combined with Long Period Fiber Grating (LPFG) serving as an edge filter. When the wavelength shift induced by variation on the FBG, the laser cavity loss changes according the loss slope, this results in an output intensity fluctuation responsibly. The variation measurement could be obtained by measuring the output intensity. In this paper, we proposed a high linear slope efficiency of 5.64dB/nm, which is more than two times improvement when compare with conventional LPFG edge filter, such high slope efficiency is greatly beneficial to improve the resolution of sensing system. View full abstract»

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  • A Fingerprinting Utilizing Chaos-Based Watermarking Techniques

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (518 KB) |  | HTML iconHTML  

    In this paper, a fingerprinting using chaos-based watermark for copyright protection of the image transmission system is presented with experimental results in this paper. This system assures when pirated image is found, the illegal user can be traced. The user's message after chaotic encryption as watermark embeds into image. Experimental results show our system which is used for a web-based image transmission is effective and robust. Especially, user's message can also be extracted from watermark image under diverse attacks such as some image-processing operations and JPEG compression. View full abstract»

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  • A Further Study on the Representation Method of Plant Photosynthetic Capacity Based on Unsaturated Light-Induced Delayed Fluorescence Intensity

    Publication Year: 2011 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (501 KB) |  | HTML iconHTML  

    The method of using unsaturated light-induced delayed fluorescence (DF) intensity to represent photosynthetic capacity (PhC) has been testified experimentally by our research group. For further perfection of the proposed method, in this research, a four-segment DF light response curve model was presented, the relationship between saturated and unsaturated light-induced DF intensity was investigated, and the conversion factor between unsaturated light-induced DF intensity and PhC was discussed. Through theoretical deduced and experimental measurement, it was testified that unsaturated light-induced DF intensity is a feasible method to represent plant PhC. The method may be a potential technique in next generation photosynthesis measurement. View full abstract»

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  • A GPU-Based 3D Image Synthesizing Method for Real-Time Multiview Autostereoscopic Displays

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (237 KB) |  | HTML iconHTML  

    Multiview autostereoscopic systems display three-dimensional (3D) images interleaved from parallax images to provide adequate viewing zones for viewers. A 3D image synthesizing method based on parallel processing with Graphic Processing Unit (GPU) is proposed to accelerate the image synthesizing for real-time autostereoscopic displays. The GPU-based 3D image synthesizing method is implemented with Direct3D Application Programming Interface (API) library. Compared with traditional methods using Central Processing Unit (CPU), the proposed method takes advantage of GPU graphic processing. The experiments prove that GPU-based 3D image synthesizing method can meet the requirement of real-time 3D image synthesizing and perform well in stereoscopic sense. View full abstract»

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  • A High Precision Constant Current Source Applied in LED Driver

    Publication Year: 2011 , Page(s): 1 - 4
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (297 KB) |  | HTML iconHTML  

    LED is generally driven by constant current because the color and brightness of LED are directly related to their forward current. The current accuracy is a very important index for a high performance LED driver. In this paper, a constant current source applied in LED driver is proposed to improve the accuracy of the LED current. The constant current source consists of a reference current generator, a current mirror and a current regulator. An accurate current mirror with high impedance is utilized which eliminates the channel length modulation effect of the MOSFETs. A new current regulator in which MOSFET operates in linear region instead of saturation region is proposed to improve the current accuracy and the driver's efficiency. The proposed circuit is based on chartered 0.35μm 3.3/5 V process and has been simulated by Cadence spectre. The output current is 150 mA. Simulation results show that current accuracy of +/-0.5% for a wide output voltage range from 0.35 V to 13 V is obtained. View full abstract»

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  • A Method for Simultaneously Measuring Phase Retardation and Fast Axis of Any Wave Plate

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (275 KB) |  | HTML iconHTML  

    A method for simultaneously measuring phase retardation and fast axis of any wave plate is presented. In this method, a test wave plate is placed between a polarizer and an analyzer, and with no requirements for the initial position of the wave plate. The test wave plate can rotate under the control of a stepping motor. With the rotation of the wave plate, a photoelectric detector is used to detect the output light intensity, and the time-dependent curve of the output intensity can be obtained. Based on the analysis of the curve, the phase retardation and fast axis of the wave plate can be determined at the same time. The advantage of this method is its simplicity, low cost, better accuracy and it can effectively eliminate artificial operation error because of the measuring process is controlled by a computer. View full abstract»

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  • A Method for the Motion Parameters Estimation in Incomplete Synchro-Ballistic Photography

    Publication Year: 2011 , Page(s): 1 - 4
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (487 KB) |  | HTML iconHTML  

    Streak camera is widely used to estimate the motion parameters of the projectile in weapon tests. It is difficult to achieve a satisfactory level of accuracy, as it is subject to strict synchro-ballistic relationship between the projectile and the camera. In order to tackle this problem, a novel method based on an equivalent Orthogonal-Streak design is proposed. Stereo projectile images are generated on a single film simultaneously, from where key points are selected to calculate velocity, attitude and the angle of attack. The simulation experiments show that our method can maintain accuracy and robustness even if the measurement is performed in incompletely synchro-ballistic photography. View full abstract»

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  • A New Beam Combination of Fiber Laser Array

    Publication Year: 2011 , Page(s): 1 - 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (831 KB) |  | HTML iconHTML  

    Coherent beam combination of fiber laser array is an important technology in realizing high power fiber laser system. This paper designs a simple and effective method to get more concentrated laser intensity distribution and higher peak power in the far-field. The difference from previous designs is the focusing beams combination scheme is adopted. Compared with the traditional one, it gets the meaningful conclusion. At the same time, the effect of fill factor on conversion efficiency was analyzed in detail. View full abstract»

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  • A New Method of Measuring Torsional Vibration Based on High-Speed Linear Array CCD

    Publication Year: 2011 , Page(s): 1 - 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (184 KB)  

    All kinds of mechanical shaft torque, also can produce torsional vibration under the force. In order to improve the safety of operation, testing and monitoring torsional vibration of the shaft are very important. In this paper we proposed the new method using high-speed linear array CCD to measure torsional vibration of the shaft. Based on the motion of spiral marker line which is output images of the CCD, we can get torsional angle and torsional moment in any section of the shaft. Compared with the existing methods, stable, large amount of data, high precision, implementing convenient, non-contact measurement and can be measured more than once more and any section of the shaft etc. View full abstract»

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  • A New Physical Model for Waveguide-Separated Absorption Charge Multiplication-Avalanche Photodetector

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (380 KB) |  | HTML iconHTML  

    In this paper a physical model for waveguide-separated absorption charge multiplication avalanche photodetector (WG-SACM-APD) is presented. Through some straight forward manipulations and considering the theory of linear time invariant system, frequency domain modeling of this detector including parasitic sources is achieved. Finally, the transfer function and detector's bandwidth with respect to the multiplication gain are also investigated. View full abstract»

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  • A Novel Fiber Bragg Grating Accelerometer with Vertical High Frequency and Horizontal Low Frequency

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (490 KB) |  | HTML iconHTML  

    A novel fiber Bragg grating acceleration sensor with high frequency in vertical direction and low frequency in horizontal direction based on a structure of stainless steel capillary is proposed. In vertical direction its resonant frequency can reach 2200Hz and in horizontal direction its sensitivity can reach 209pm/g so that we can change the direction of the capillary conveniently according to the practical requirements of high frequency or high sensitivity in seismic exploration. View full abstract»

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  • A Novel Method of Inducing Phase Shifts in Fiber Bragg Grating without Using Phase Mask

    Publication Year: 2011 , Page(s): 1 - 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (916 KB) |  | HTML iconHTML  

    A method of inducing phase shifts in Fiber Bragg Grating (FBG) by increasing Dc refractive index of the FBG is presented and experimentally verified. Only submicrometer-precision in control is enough and the phase mask in not necessarily needed in fabrication. The proposed method is markedly advantageous in cost-effectiveness, flexibility and simplicity compared to traditional ways in fabrication and mass production particularly in applications like optical code-division multiple-access (OCDMA) en/decoder ,optical filter in which complex multi-phase shifts are needed. View full abstract»

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  • A Novel Optical Method to Detect DNA Concentration Using Lock-In Amplifier

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (444 KB) |  | HTML iconHTML  

    To detect DNA concentration, a novel fiber optic biosensor based on fluorescence quenching was designed and constructed by using lock-in amplifier for signal measurement. The sensor head was fixed on the sensing membrane prepared by the mixture of ethyl silicate, formamide, HCI and fluorescence indicator. The optimal film-forming conditions are that the contents of indicator [Ru(bipy)2DAFND](CIO4)2 (Ru-DAFND, bipy is 2, 2-bipyridine, DAFND is 4, 5-diazafluorene-9-p nitrophenylhydrazone), HCI (0.01 mol/L) and formamide were 2.5 mg/mL, 11 % and 16 % respectively, the aging temperature and time of the sol-gel solution were 4 °C and 5 d, and the film forming temperature and time were 4 °C and 48 h, respectively. A linear relationship between the relative phase delay \φ of the sensing membrane and calf thymus DNA (ctDNA) concentration was observed in range from 2.6×10-8 to 5.4×10-6 mol/L in Tris buffer (pH 7.1), and the detection limit was 8.4×10-9 mol/L. The biosensor has a response time of 70 s and shows good stability and repeatability. View full abstract»

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