The Experts below are selected from a list of 32196 Experts worldwide ranked by ideXlab platform
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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Full dispersion compensation for ~500 fs pulses over 50 km SMF Fiber transmission at 10 GHz using dispersion compensating Fiber and a spectral phase equalizer
2004Co-Authors: Zhi Jiang, Shang-da Yang, Daniel E. Leaird, Andrew M. WeinerAbstract:Z. Jiang, S.-D. Yang, D.E. Leaird, and A.M. Weiner Purdue University, 465 Northwestern Ave., West Lafayette, IN 47907-2035, USA zjiang@purdue.edu, shangda@purdue.edu, leaird@purdue.edu, amw@ecn.purdue.edu Abstract We demonstrate essentially distortionless 50 km single mode Fiber transmission for ~500 fs pulses by the use of dispersion compensating Fiber and a programmable pulse shaper as a spectral phase equalizer. This distance is approximately five times longer than previous results at similar pulse widths.
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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.
Namkyoo Park - One of the best experts on this subject based on the ideXlab platform.
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Flat amplitude equal spacing 798-channel Rayleigh-assisted Brillouin/Raman multiwavelength comb generation in dispersion compensating Fiber
IEEE Photonics Technology Letters, 2001Co-Authors: Bumki Min, Pilhan Kim, Namkyoo ParkAbstract:We demonstrate a simple method of generating evenly spaced multiwavelength Brillouin comb by employing dispersion compensating Fiber both for Brillouin Stokes generation and Raman amplification. Multiwavelength output of 798 Brillouin Stokes lines with average channel power of -17 dBm has been obtained with excellent flatness. Channel spacing corresponds to the Brillouin Stokes shift in dispersion compensating Fiber and is estimated to be 9.4 GHz with the heterodyne detection method. Coupled interaction of Brillouin, Raman, and Rayleigh scattering explains the unique feature of proposed structure.
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flat amplitude equal spacing 798 channel rayleigh assisted brillouin raman multiwavelength comb generation in dispersion compensating Fiber
IEEE Photonics Technology Letters, 2001Co-Authors: Bumki Min, Pilhan Kim, Namkyoo ParkAbstract:We demonstrate a simple method of generating evenly spaced multiwavelength Brillouin comb by employing dispersion compensating Fiber both for Brillouin Stokes generation and Raman amplification. Multiwavelength output of 798 Brillouin Stokes lines with average channel power of -17 dBm has been obtained with excellent flatness. Channel spacing corresponds to the Brillouin Stokes shift in dispersion compensating Fiber and is estimated to be 9.4 GHz with the heterodyne detection method. Coupled interaction of Brillouin, Raman, and Rayleigh scattering explains the unique feature of proposed structure.
Takatoshi Kato - One of the best experts on this subject based on the ideXlab platform.
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Dispersion flattened transmission line consisting of wide-band non-zero dispersion shifted Fiber and dispersion compensating Fiber module
Optical Fiber Technology, 2002Co-Authors: Takatoshi Kato, A. Tada, M. Hirano, K. Fukuada, T. Fujii, T. Ooishi, Y. Yokoyama, M. Yoshida, Masashi OnishiAbstract:The transmission line consisting of non-zero dispersion shifted Fibers (NZ–DSFs) and dispersion compensating Fiber (DCF) modules has been proposed to enable the wide-band wavelength division multiplexing (WDM) transmission. The NZ–DSFs with the effective area over 60 μm2 and the dispersion of +5–11 ps/nm/km (1500–1600 nm) have been developed to suppress the transmission penalty caused by the four-wave mixing. The DCF modules which compensate for the dispersion and the dispersion slope simultaneously have also been realized. To enhance the figure of merit (FOM) of the DCF by enlarging the absolute value of its dispersion is found to be an effective way to reduce the non-linear effects occuring in the DCF. The transmission line actually fabricated based on the optimized design exhibits an extremely low dispersion deviation of ±0.08 ps/nm/km in the C band.
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temperature dependence of chromatic dispersion in various types of optical Fiber
Optics Letters, 2000Co-Authors: Takatoshi Kato, Yasushi KoyanoAbstract: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, Takatoshi Kato, Tomonori Kashiwada, Koji Nakazato, Chie Fukuda, Masashi OnishiAbstract: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.
I. C. Goyal - One of the best experts on this subject based on the ideXlab platform.
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Design of a small residual dispersion Fiber and a corresponding dispersion compensating Fiber for dense wavelength division multiplexing systems
Optical Engineering, 2003Co-Authors: I. C. Goyal, R. K. Varshney, A. K. GhatakAbstract:We present the designs of a small residual dispersion Fiber (SRDF) and a corresponding Dispersion-Compensating Fiber (DCF), where the dispersion slopes of these Fibers are so adjusted that a small length of the DCF will approximately compensate the accumulated dispersion in SRDF simultaneously at all wavelengths in the range of 1530 to 1565 nm [gain window (C-band) of erbium-doped Fiber amplifiers]. The maximum values of the effective dispersion and the slope of the effective dispersion in the wavelength range of 1530 to 1565 nm are ∼0.08 ps/ km nm and ∼0.01 ps/km nm 2 , respectively.
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Design of a small residual dispersion Fiber and a corresponding dispersion compensating Fiber
Applications of Photonic Technology 5, 2003Co-Authors: I. C. Goyal, R. K. Varshney, A. K. GhatakAbstract:We have given designs of a Small Residual Dispersion Fiber (SRDF) and a corresponding Dispersion Compensating Fiber (DCF), where the dispersion slopes of these Fibers are so adjusted that a small length of the DCF will approximately compensate the accumulated dispersion in SRDF simultaneously at all wavelengths in the range of 1530 to 1565 nm (gain window of Erbium Doped Fiber Amplifiers). The maximum values of the effective dispersion and the slope of the effective dispersion in the wavelength range of 1530 to 1565 nm are approximately 0.08 ps/(km.nm) and approximately 0.01 ps/(km.nm2), respectively.© (2003) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
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A novel high performance dispersion compensating Fiber design
1997Co-Authors: Krishna Thyagarajan, R. K. Varshney, P. Palai, A. K. Ghatak, I. C. GoyalAbstract:We propose a novel dispersion compensating Fiber design consisting of two highly asymmetric concentric cores. We show that the fundamental mode of the proposed Fiber can have very large negative dispersion values (∼-5100 ps/(nm.km)) with larger mode field diameter (∼ 9 μm) relative to the existing dispersion compensating Fibers.
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A novel design of a dispersion compensating Fiber
IEEE Photonics Technology Letters, 1996Co-Authors: Krishna Thyagarajan, R. K. Varshney, P. Palai, A. K. Ghatak, I. C. GoyalAbstract:We propose a novel dispersion compensating Fiber design consisting of two highly asymmetric concentric cores. We show that the fundamental mode of the proposed Fiber can have very large negative dispersion values [/spl sim/-5100 ps/(nm.km)] with larger mode field diameter (/spl sim/8-9 /spl mu/m) relative to the existing dispersion compensating Fibers.
A. K. Ghatak - One of the best experts on this subject based on the ideXlab platform.
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Design of a small residual dispersion Fiber and a corresponding dispersion compensating Fiber for dense wavelength division multiplexing systems
Optical Engineering, 2003Co-Authors: I. C. Goyal, R. K. Varshney, A. K. GhatakAbstract:We present the designs of a small residual dispersion Fiber (SRDF) and a corresponding Dispersion-Compensating Fiber (DCF), where the dispersion slopes of these Fibers are so adjusted that a small length of the DCF will approximately compensate the accumulated dispersion in SRDF simultaneously at all wavelengths in the range of 1530 to 1565 nm [gain window (C-band) of erbium-doped Fiber amplifiers]. The maximum values of the effective dispersion and the slope of the effective dispersion in the wavelength range of 1530 to 1565 nm are ∼0.08 ps/ km nm and ∼0.01 ps/km nm 2 , respectively.
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Design of a small residual dispersion Fiber and a corresponding dispersion compensating Fiber
Applications of Photonic Technology 5, 2003Co-Authors: I. C. Goyal, R. K. Varshney, A. K. GhatakAbstract:We have given designs of a Small Residual Dispersion Fiber (SRDF) and a corresponding Dispersion Compensating Fiber (DCF), where the dispersion slopes of these Fibers are so adjusted that a small length of the DCF will approximately compensate the accumulated dispersion in SRDF simultaneously at all wavelengths in the range of 1530 to 1565 nm (gain window of Erbium Doped Fiber Amplifiers). The maximum values of the effective dispersion and the slope of the effective dispersion in the wavelength range of 1530 to 1565 nm are approximately 0.08 ps/(km.nm) and approximately 0.01 ps/(km.nm2), respectively.© (2003) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
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A novel high performance dispersion compensating Fiber design
1997Co-Authors: Krishna Thyagarajan, R. K. Varshney, P. Palai, A. K. Ghatak, I. C. GoyalAbstract:We propose a novel dispersion compensating Fiber design consisting of two highly asymmetric concentric cores. We show that the fundamental mode of the proposed Fiber can have very large negative dispersion values (∼-5100 ps/(nm.km)) with larger mode field diameter (∼ 9 μm) relative to the existing dispersion compensating Fibers.
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A novel design of a dispersion compensating Fiber
IEEE Photonics Technology Letters, 1996Co-Authors: Krishna Thyagarajan, R. K. Varshney, P. Palai, A. K. Ghatak, I. C. GoyalAbstract:We propose a novel dispersion compensating Fiber design consisting of two highly asymmetric concentric cores. We show that the fundamental mode of the proposed Fiber can have very large negative dispersion values [/spl sim/-5100 ps/(nm.km)] with larger mode field diameter (/spl sim/8-9 /spl mu/m) relative to the existing dispersion compensating Fibers.