The Experts below are selected from a list of 3192 Experts worldwide ranked by ideXlab platform
Masayuki Nishimura - One of the best experts on this subject based on the ideXlab platform.
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temperature dependence of chromatic dispersion in various types of optical Fiber
Optics Letters, 2000Co-Authors: Takatoshi Kato, Yasushi Koyano, Masayuki NishimuraAbstract:The temperature dependence of chromatic dispersion is examined for various types of Fiber. Its coefficient is found to depend strongly on the dispersion slope. Dispersion-flattened Fiber has a significantly low coefficient of -0.0005ps/nm/km/°C, compared with -0.0038ps/nm/km/°C for large-core nonzero dispersion-shifted Fiber. Transmission lines with low dispersion slopes consisting of pure silica core Fiber and dispersion-Compensating Fiber also exhibit low coefficients of less than -0.001ps/nm/km/°C because of their Compensating effects.
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Dual-band hybrid transmission line consisting of pure silica core Fiber and dispersion Compensating Fiber
Optical Fiber Communication Conference. Technical Digest Postconference Edition. Trends in Optics and Photonics Vol.37 (IEEE Cat. No. 00CH37079), 2000Co-Authors: Eiji Yanada, Y. Makio, Masao Tsukitani, Eisuke Sasaoka, Yuichi Ohga, Masayuki NishimuraAbstract:Ultimately small dispersion slope less than 0.003 ps/nm2/km was realized for both c and l bands by a novel pure-silica core Fiber/dispersion Compensating Fiber hybrid transmission line, which also exhibited small average attenuation of 0.205 dB/km and low non-linearity.
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High-performance dispersion-Compensating Fibers
Fiber and Integrated Optics, 1997Co-Authors: Masashi Onishi, Masayuki Nishimura, Tomonori Kashiwada, Yoichi Ishiguro, Yasushi Koyano, Hiroo KanamoriAbstract:Abstract An optimum Fiber structure for a practical dispersion-Compensating Fiber (DCF) has been explored theoretically and experimentally, taking dispersion, attenuation, bending loss characteristics, polarization mode dispersion, and nonlinear effects into account. A high figure of merit (FOM) of 280 ps/nm/dB has been successfully achieved with a simple matched cladding design. Furthermore, it was confirmed that the optimized structure with enhanced FOM also benefits self-phase modulation (SPM) suppression.
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2.5-Gbit/s Repeaterless Transmission Systems over Non-Dispersion-Shifted Fiber Using Directly Modulated DFB Laser and Dispersion Compensating Fiber
Optical Fiber Technology, 1995Co-Authors: Motoki Kakui, Masashi Onishi, Takatoshi Kato, Tomonori Kashiwada, Koji Nakazato, Chie Fukuda, Masayuki NishimuraAbstract:Abstract Feasibility of repeaterless transmission systems over non-dispersion-shifted Fiber (NDSF) using directly modulated DFB lasers and dispersion Compensating Fiber (DCF) was examined. The transmission characteristics were investigated by simulations, considering the effects of the laser chirping, Fiber chromatic dispersion, and the self-phase-modulation (SPM) occurring in both NDSF and DCF. As a result, it was revealed that the post-compensation scheme is the most suitable and that the SPM in DCF dominantly deteriorates the transmission characteristics in this scheme. Following the predictions by the simulations, 2.5 Gbit/s repeaterless transmission over 306-km pure-silica-core Fiber has been demonstrated with no power penalty, using a directly modulated DFB laser with a bulk active layer and dispersion Compensating Fibers.
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measurement of the nonlinear refractive index in optical Fiber by the cross phase modulation method with depolarized pump light
Optics Letters, 1995Co-Authors: Takatoshi Kato, Y Suetsugu, M Takagi, E Sasaoka, Masayuki NishimuraAbstract:Depolarized pump light is used in measurements of the nonlinear refractive index, n2, in optical Fiber by the cross-phase-modulation method. High measurement repeatability within ±1% is obtained by this method. The nonlinear refractive index is determined for dispersion-shifted Fiber, standard single-mode Fiber, pure silica-core single-mode Fiber, and dispersion-Compensating Fiber as 3.35 × 10−20, 2.96 × 10−20, 2.79 × 10−20, and 4.44 × 10−20 m2/W, respectively, at 1.55 μm. This shows that the nonlinear refractive indices of the optical Fibers differ greatly according to glass composition.
W E I Peng - One of the best experts on this subject based on the ideXlab platform.
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Temperature-Compensating Fiber-Optic Surface Plasmon Resonance Biosensor
Photonics Technology Letters IEEE, 2016Co-Authors: Chen Su, Qian Liu, Yong Liu, W E I PengAbstract:A temperature-Compensating Fiber-optic surface plasmon resonance (SPR) biosensor based on a Fabry–Perot (FP) interference is described and demonstrated in this letter. The sensing element includes an SPR measuring signal and an FP referencing signal, which appear on gold-coated multimode Fiber and capillary, respectively. Because the FP sensing element is sensitive to temperature while insensitive to the refractive index, the referencing channel compensates for the impact of external ambient temperature and enhances the accuracy and reliability of the biosensor. The performance of the temperature-Compensating SPR biosensor for accurate measurements is evaluated through the specific binding between Con A and RNase B under interference temperature. In addition, the design and fabrication of the temperature-Compensating Fiber SPR biosensor are cost effective and simple.
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Self-Compensating Fiber optic flow sensor system and its field applications
Applied Optics, 2004Co-Authors: W E I Peng, Juncheng Xu, Bing Qi, Zhengyu Huang, Gary R. Pickrell, Dae Woong Kim, Anbo WangAbstract:A self-Compensating Fiber optic flow sensor system based on the principle of broadband white-light interferometers and cantilever beam bending is described. The Fiber optic sensor system uses two Fiber ferrule sensors that are bonded on either side of a cantilever beam to measure the flow rate by monitoring the air-gap changes caused by the bending of the cantilever beam. Cross sensitivity of the temperature and pressure dependence of the sensor can be compensated for automatically. The prototype sensor system was constructed, laboratory characterized, and field tested. The results from the field testing have demonstrated high resolution, repeatability, and stability for on-line detection of the flow rates of fluids.
Takatoshi Kato - One of the best experts on this subject based on the ideXlab platform.
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temperature dependence of chromatic dispersion in various types of optical Fiber
Optics Letters, 2000Co-Authors: Takatoshi Kato, Yasushi Koyano, Masayuki NishimuraAbstract:The temperature dependence of chromatic dispersion is examined for various types of Fiber. Its coefficient is found to depend strongly on the dispersion slope. Dispersion-flattened Fiber has a significantly low coefficient of -0.0005ps/nm/km/°C, compared with -0.0038ps/nm/km/°C for large-core nonzero dispersion-shifted Fiber. Transmission lines with low dispersion slopes consisting of pure silica core Fiber and dispersion-Compensating Fiber also exhibit low coefficients of less than -0.001ps/nm/km/°C because of their Compensating effects.
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2.5-Gbit/s Repeaterless Transmission Systems over Non-Dispersion-Shifted Fiber Using Directly Modulated DFB Laser and Dispersion Compensating Fiber
Optical Fiber Technology, 1995Co-Authors: Motoki Kakui, Masashi Onishi, Takatoshi Kato, Tomonori Kashiwada, Koji Nakazato, Chie Fukuda, Masayuki NishimuraAbstract:Abstract Feasibility of repeaterless transmission systems over non-dispersion-shifted Fiber (NDSF) using directly modulated DFB lasers and dispersion Compensating Fiber (DCF) was examined. The transmission characteristics were investigated by simulations, considering the effects of the laser chirping, Fiber chromatic dispersion, and the self-phase-modulation (SPM) occurring in both NDSF and DCF. As a result, it was revealed that the post-compensation scheme is the most suitable and that the SPM in DCF dominantly deteriorates the transmission characteristics in this scheme. Following the predictions by the simulations, 2.5 Gbit/s repeaterless transmission over 306-km pure-silica-core Fiber has been demonstrated with no power penalty, using a directly modulated DFB laser with a bulk active layer and dispersion Compensating Fibers.
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measurement of the nonlinear refractive index in optical Fiber by the cross phase modulation method with depolarized pump light
Optics Letters, 1995Co-Authors: Takatoshi Kato, Y Suetsugu, M Takagi, E Sasaoka, Masayuki NishimuraAbstract:Depolarized pump light is used in measurements of the nonlinear refractive index, n2, in optical Fiber by the cross-phase-modulation method. High measurement repeatability within ±1% is obtained by this method. The nonlinear refractive index is determined for dispersion-shifted Fiber, standard single-mode Fiber, pure silica-core single-mode Fiber, and dispersion-Compensating Fiber as 3.35 × 10−20, 2.96 × 10−20, 2.79 × 10−20, and 4.44 × 10−20 m2/W, respectively, at 1.55 μm. This shows that the nonlinear refractive indices of the optical Fibers differ greatly according to glass composition.
Andrew M. Weiner - One of the best experts on this subject based on the ideXlab platform.
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optical dispersion compensator with 4000 ps nm tuning range using a virtually imaged phased array vipa and spatial light modulator slm
IEEE Photonics Technology Letters, 2006Co-Authors: Shijun Xiao, Andrew M. WeinerAbstract:We present an optical tunable chromatic dispersion compensator based on a virtually imaged phased-array and spatial light modulator providing both positive and negative dispersion. We demonstrate tunable dispersion compensation of 10-Gb/s positively chirped nonreturn-to-zero data signal over a range of -4080~+850ps/nm (240-km single-mode Fiber to 9.5-km dispersion-Compensating Fiber), which operates independent of the input state of polarization and has potential capability for wavelength-division multiplexing
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Complete dispersion compensation for 400-fs pulse transmission over 10-km Fiber link using dispersion Compensating Fiber and spectral phase equalizer
IEEE Photonics Technology Letters, 1999Co-Authors: S. Shen, Andrew M. WeinerAbstract:We have demonstrated essentially complete dispersion compensation for 400-fs pulses over a 10-km Fiber link using dispersion Compensating Fiber and a programmable femtosecond pulse shaper functioning as a spectral phase equalizer. The pulse shaper impresses adjustable quadratic and cubic phases onto the spectrum and removes all the residual dispersion and dispersion slope in the dispersion compensated Fiber link. Our work shows that the pulse shaper technique provides a powerful and convenient tool for programmable Fiber dispersion compensation over broad optical bandwidth. This allows distortion-free femtosecond pulse transmission over a Fiber link in excess of 10 km without requiring the exact trimming of the dispersion-Compensating Fiber.
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Dispersion-free Fiber transmission for femtosecond pulses by use of a dispersion-Compensating Fiber and a programmable pulse shaper.
Optics Letters, 1998Co-Authors: C.-c. Chang, H.p. Sardesai, Andrew M. WeinerAbstract:We demonstrate nearly distortionless 2.5-km Fiber transmission of sub-500-fs pulses, using a combination of standard single-mode Fiber, dispersion-Compensating Fiber, and a programmable pulse shaper for simultaneous quadratic and cubic dispersion compensation. The dispersion-Compensating Fiber corrects the bulk of the quadratic and the cubic phases for the single-mode Fiber, and the Fiber-pigtailed programmable pulse shaper exactly compensates the residual dispersion terms. Together these elements permit complete recompression of pulses, which first broaden by ?400 times in the single-mode Fiber.
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Fiber transmission for sub-500-fs pulses using a dispersion-Compensating Fiber
IEEE Journal of Quantum Electronics, 1997Co-Authors: C.-c. Chang, Andrew M. WeinerAbstract:We report transmission of /spl sim/60-fs and /spl sim/245-fs pulses, respectively, over 42-m and 2.5-km Fiber links which consist of standard single-mode Fibers (SMF) concatenated with dispersion-Compensating Fibers (DCF). The experiments using very short pulses (/spl sim/60 fs) over a short Fiber length (/spl sim/42 m) demonstrate the ability to achieve simultaneous dispersion and dispersion slope compensation using this technique. Femtosecond spectral interferometry measurements of this 42-m link show that its residual dispersion slope is approximately six times lower than that of the dispersion-shifted Fiber. Finally, to demonstrate that the dispersion-limited propagation distance is proportional to the cube of the pulsewidth, we transmit /spl sim/245-fs pulses over a 2.5-km SMF-DCF link and achieve comparable pulse restoration as with the shorter Fiber experiments.
Thomas Andrew Strasser - One of the best experts on this subject based on the ideXlab platform.
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electrically tunable power efficient dispersion Compensating Fiber bragg grating
IEEE Photonics Technology Letters, 1999Co-Authors: Benjamin J Eggleton, John A Rogers, Paul S Westbrook, Thomas Andrew StrasserAbstract:Novel devices only offer reasonable telecommunication solutions when they can be packaged and manufactured efficiently and at low cost. We demonstrate such a compact and power efficient tunable dispersion Compensating Fiber Bragg grating (FBG) device. The device relies on a distributed on-Fiber thin-film heater deposited onto the outer surface of an unchirped FBG. Current flowing though the thin film generates resistive heating that is governed by the thickness profile of the metal film. A chirp in the grating is obtained by using a coating whose thickness varies with position along the length of the grating in a prescribed manner; the chirp rate is adjusted by varying the applied current. Using an electrical power of less than 1 W in a packaged device, we demonstrate a linearly chirped Bragg grating in which the dispersion is continuously tuned from -300 to -1350 ps/nm, with an average deviation from linearity of approximately 10 ps.
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electrically tunable power efficient dispersion Compensating Fiber bragg gratings for dynamic operation in nonlinear lightwave systems
Optical Fiber Communication Conference, 1999Co-Authors: Benjamin J Eggleton, John A Rogers, Paul S Westbrook, Thomas Andrew Strasser, Torben N Nielsen, Per Bang Hansen, K F DreyerAbstract:We demonstrate a power efficient (<0.5 W) tunable dispersion Compensating Fiber Bragg grating device and show for the first time dynamic optimization of dispersion in a nonlinear lightwave system. Operation is demonstrated in a 20 Gbit/s single channel NRZ system where the device was used to adjust the dispersion to the power-dependent optimal dispersion required for optimum performance.