The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
K Kikuchi - One of the best experts on this subject based on the ideXlab platform.
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adjustable group velocity Dispersion and Dispersion Slope compensation devices with wavelength tunability based on enhanced thermal chirping of fiber bragg gratings
Journal of Lightwave Technology, 2007Co-Authors: Budiman Dabarsyah, Chee Seong Goh, Sze Yun Set, Sunil K Khijwania, Kazuhiro Katoh, K KikuchiAbstract:We demonstrate group velocity Dispersion (GVD) and Dispersion Slope (DS) compensation devices based on enhanced thermal chirping of glued fiber Bragg gratings (FBGs). By gluing a uniform FBG onto a uniform Zn channel for the GVD compensator and a linearly tapered Zn channel for the DS compensator, the thermal sensitivity of the FBG is enhanced. The thermal chirping of the FBG is given by the thermal expansion of a Zn channel, the thermooptic effect, and the thermal expansion of the optical fiber. Controlling the temperature distributions of the uniform FBG performs the tuning of GVD and/or DS, as well as their center wavelengths. These compensation devices can tune their GVD or DS while maintaining a constant center wavelength and change their center wavelengths while preserving constant GVD or DS values. The GVD can be tuned from -123.39 to -57.29 ps/nm with the center wavelength at 1552.9 nm, while the center wavelength can be shifted 2.2 nm with a GVD value of about -105 ps/nm. On the other hand, the DS can be tuned from -8.88 to -24.44 ps/nm2 with the center wavelength at 1554.5 nm, while the center wavelength can be shifted 0.6 nm with a DS value of about -10.4 ps/nm2.
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design and fabrication of a tunable Dispersion Slope compensating module based on strain chirped fiber bragg gratings
IEEE Photonics Technology Letters, 2004Co-Authors: Chee Seong Goh, Sze Yun Set, K KikuchiAbstract:We report the design and fabrication of a tunable Dispersion-Slope compensating module based on a concatenation of a linearly strain-chirped fiber Bragg grating (FBG) and a nonlinearly strain-chirped FBG. By bending a substrate in an S shape, on which each FBG is mounted, we can adjust only the Dispersion Slope while maintaining the group-velocity Dispersion as well as the center wavelength. The Dispersion Slope can be tuned up to -58.4 ps/nm/sup 2/ in this module for a bandwidth larger than 1.65 nm.
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a novel tunable Dispersion Slope compensator based on nonlinearly thermally chirped fiber bragg grating
Optics Communications, 2003Co-Authors: Sunil K Khijwania, Sze Yun Set, Chee Seong Goh, K KikuchiAbstract:Abstract We propose a novel method for introducing a chirp on a fiber Bragg grating. Applying a controllable nonlinear temperature gradient across a uniformly written Bragg grating chirps it nonlinearly to realize a tunable Dispersion Slope compensator for waveform distortion compensation. This scheme allows an adjustable, repeatable, stable, and precise nonlinear chirp onto the grating. The Dispersion Slope of the device was tuned from −37.06 to −199.45 ps/nm 2 , with observed GDR as low as ±5 ps.
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nonlinearly strain chirped fiber bragg grating with an adjustable Dispersion Slope
IEEE Photonics Technology Letters, 2002Co-Authors: Chee Seong Goh, K Taira, Sze Yun Set, Sunil K Khijwania, K KikuchiAbstract:In this letter, we demonstrate an adjustable Dispersion Slope compensator for waveform distortion compensation based on a nonlinearly strain-chirped fiber Bragg grating. The Dispersion Slope of the device can be tuned up to -18.9 ps/nm/sup 2/ with a bandwidth >2.4 nm. After transmission through a 120-km-long Dispersion-shifted fiber, the resulting waveform distortion for a 2.65-ps pulse is successfully compensated by using this device.
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optical sampling system at 1 55 μm for the measurement of pulse waveform and phase employing sonogram characterization
IEEE Photonics Technology Letters, 2001Co-Authors: K Taira, K KikuchiAbstract:Aiming at the measurement of waveform and phase of optical pulses at 1.55 /spl mu/m, we construct an optical sampling system that enables sonogram characterization of optical pulses. We demonstrate the measurement of impulse response of an optical bandpass filter as a specific application of the system. The measured intensity and phase responses clearly show the effect of the Dispersion Slope of the filter.
Kate Sugden - One of the best experts on this subject based on the ideXlab platform.
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tunable pure Dispersion Slope compensators realized with novel complex gratings
Bragg Gratings Photosensitivity and Poling in Glass Waveguides (2007) paper BTuB6, 2007Co-Authors: Xuewen Shu, Kate Sugden, Elena G Turitsyna, Ian BennionAbstract:We present a novel tunable Dispersion compensator that can provide pure Slope compensation. In experiments, we achieve Dispersion Slope tuning range of +/-650ps/nm2with >0.9nm usable bandwidth.
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tailored gires tournois etalons as tunable Dispersion Slope compensators
Optics Letters, 2004Co-Authors: Xuewen Shu, Ian Bennion, J Mitchell, Kate SugdenAbstract:We present a novel concept of a tailored Gires-Tournois etalon structure and show that such a device is useful for the fabrication of a Dispersion-Slope compensator with an almost arbitrary Dispersion profile and also with tunability in the Dispersion Slope. © 2004 Optical Society of America.
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design and realization of Dispersion Slope compensators using distributed gires tournois etalons
IEEE Photonics Technology Letters, 2004Co-Authors: Xuewen Shu, K Chisholm, Kate SugdenAbstract:We report the design and realization of novel Dispersion Slope compensators (DSCs) using fiber Bragg grating-based distributed Gires-Tournois etalons (DGTEs). By offsetting the free spectral range of the DGTEs, both positive and negative DSCs have been realized. Owing to compact all-in-fiber design, such a device is an attractive solution for Dispersion Slope compensation, which has advantages such as low loss, low cost, low group delay ripples.
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transmissive in fiber fabry perot etalons as tunable Dispersion compensators and Dispersion Slope compensators
Optics Letters, 2003Co-Authors: Xuewen Shu, Kate SugdenAbstract:We report for what is believed to be the first time the use of transmissive fiber Bragg grating-based Fabry-Perot etalons for tunable Dispersion compensation and Dispersion-Slope compensation. The resulting device has a number of advantages, such as low cost, ease of fabrication, full optical fiber compatibility, and simplicity.
Xuewen Shu - One of the best experts on this subject based on the ideXlab platform.
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tunable pure Dispersion Slope compensators realized with novel complex gratings
Bragg Gratings Photosensitivity and Poling in Glass Waveguides (2007) paper BTuB6, 2007Co-Authors: Xuewen Shu, Kate Sugden, Elena G Turitsyna, Ian BennionAbstract:We present a novel tunable Dispersion compensator that can provide pure Slope compensation. In experiments, we achieve Dispersion Slope tuning range of +/-650ps/nm2with >0.9nm usable bandwidth.
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tailored gires tournois etalons as tunable Dispersion Slope compensators
Optics Letters, 2004Co-Authors: Xuewen Shu, Ian Bennion, J Mitchell, Kate SugdenAbstract:We present a novel concept of a tailored Gires-Tournois etalon structure and show that such a device is useful for the fabrication of a Dispersion-Slope compensator with an almost arbitrary Dispersion profile and also with tunability in the Dispersion Slope. © 2004 Optical Society of America.
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design and realization of Dispersion Slope compensators using distributed gires tournois etalons
IEEE Photonics Technology Letters, 2004Co-Authors: Xuewen Shu, K Chisholm, Kate SugdenAbstract:We report the design and realization of novel Dispersion Slope compensators (DSCs) using fiber Bragg grating-based distributed Gires-Tournois etalons (DGTEs). By offsetting the free spectral range of the DGTEs, both positive and negative DSCs have been realized. Owing to compact all-in-fiber design, such a device is an attractive solution for Dispersion Slope compensation, which has advantages such as low loss, low cost, low group delay ripples.
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transmissive in fiber fabry perot etalons as tunable Dispersion compensators and Dispersion Slope compensators
Optics Letters, 2003Co-Authors: Xuewen Shu, Kate SugdenAbstract:We report for what is believed to be the first time the use of transmissive fiber Bragg grating-based Fabry-Perot etalons for tunable Dispersion compensation and Dispersion-Slope compensation. The resulting device has a number of advantages, such as low cost, ease of fabrication, full optical fiber compatibility, and simplicity.
Takeshi Yagi - One of the best experts on this subject based on the ideXlab platform.
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low penalty uniformly tunable wavelength conversion without spectral inversion over 30 nm using sbs suppressed low Dispersion Slope highly nonlinear fibers
IEEE Photonics Technology Letters, 2011Co-Authors: Stephane Petit, Masanori Takahashi, Takayuki Kurosu, Takeshi Yagi, Shu NamikiAbstract:We demonstrate a simple and efficient cascaded operation of parametric wavelength conversion at 43 Gb/s by four-wave mixing for arbitrary input and output wavelengths over 30 nm, using SBS-suppressed low-Dispersion-Slope highly nonlinear fibers with a power penalty below 0.7 dB.
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full c l band tunable wavelength conversion by zero Dispersion and zero Dispersion Slope hnlf
European Conference on Optical Communication, 2009Co-Authors: Masanori Takahashi, Kazunori Mukasa, Takeshi YagiAbstract:We demonstrated full C-L band tunable wavelength conversion by zero Dispersion and zero Dispersion Slope HNLF. A signal from whole C-L band was converted to an arbitrary wavelength in almost whole C-L band.
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generation of 80 nm wavelength tunable 100 fs pulse based on comblike profiled fiber comprised of hnlf and zero Dispersion Slope nzdsf
Optical Fiber Communication Conference, 2007Co-Authors: Takashi Inoue, Masanori Takahashi, Takeshi Yagi, N Kumano, Misao SakanoAbstract:To realize extremely wideband wavelength-tunable femtosecond (fs) pulse generation, we propose a Dispersion-flattened comblike profiled fiber that is a pulse compressor comprised of low Dispersion-Slope highly nonlinear fiber and zero Dispersion-Slope nonzero Dispersion-shifted fiber (ZDS-NZDSF). We also apply ZDS-NZDSF to a soliton converter to reshape and compress a seed pulse train generated from a tunable laser source and an intensity modulator. Using the proposed scheme, we successfully generate 100-fs optical pulse from the seed pulse with the varied wavelengths of 1530, 1570, and 1610 nm
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low loss and low Dispersion Slope highly nonlinear fibers
Journal of Lightwave Technology, 2005Co-Authors: Masanori Takahashi, Ryuichi Sugizaki, Jiro Hiroishi, Masateru Tadakuma, Y Taniguchi, Takeshi YagiAbstract:In recent technologies, various optical signal processing systems have been reported. In many of these applications, highly nonlinear fibers (HNLFs) are used as key parts. Especially, low loss and low Dispersion Slope are critical features of the HNLFs. In this paper, their design and characteristics, packaging technology, and applications are introduced.
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generation of 1 thz repetition rate 97 fs optical pulse train based on comb like profiled fibre
Electronics Letters, 2005Co-Authors: Yasuyuki Ozeki, Ryuichi Sugizaki, Jiro Hiroishi, Takeshi Yagi, Misao Sakano, S Takasaka, Shu NamikiAbstract:Experimentally generated is a 1 THz, 97 fs optical pulse train at 1.55 cm wavelength region based on a comb-like profiled fibre, which consists of 15 pairs of highly nonlinear fibres (HNLFs) and standard singlemode fibres. Such high-repetition rate pulse generation in the 100 fs regime was made possible by the HNLF with high nonlinearity and small Dispersion Slope.
K. Takiguchi - One of the best experts on this subject based on the ideXlab platform.
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tunable chromatic Dispersion and Dispersion Slope compensator using a planar lightwave circuit lattice form filter
Optics Letters, 2008Co-Authors: K. Takiguchi, Hiroshi Takahashi, Tomohiro ShibataAbstract:A tunable chromatic Dispersion and Dispersion Slope compensator is proposed that has a single lattice-form filter configuration. Wavelength dependence is intentionally added to its tunable couplers, which produces Dispersion Slope compensation in addition to the Dispersion compensation. Dispersion tunability of +/-500 ps/nm and a Slope of −4.9 ps/nm2 over 40 GHz are successfully demonstrated, thus meeting the requirement for 40 Gbits/s differential quadrature phase shift keying transmission with an 80 km long nonzero Dispersion-shifted fiber.
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Dispersion Slope equaliser on planar lightwave circuit for 40 gbit s based wdm transmission
Electronics Letters, 2001Co-Authors: K. Takiguchi, K Okamoto, Takashi GohAbstract:A Dispersion Slope equaliser on a planar lightwave circuit for 8 /spl times/ 40 Gbit/s WDM transmission is reported. This device consists of an eight-equaliser array fabricated on one wafer and an arrayed-waveguide grating. The bias electrical power needed for thermooptic phase shifts was reduced by over 90%.
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Dispersion Slope equalizer for Dispersion shifted fiber using a lattice-form programmable optical filter on a planar lightwave circuit
Journal of Lightwave Technology, 1998Co-Authors: K. Takiguchi, S. Kawanishi, H. Takara, A. Himeno, K HattoriAbstract:This paper reports an integrated-optic Dispersion Slope (third-order Dispersion) equalizer for Dispersion shifted fiber which employs a lattice-form programmable optical filter on a planar lightwave circuit (PLC). This Dispersion Slope equalizer consists of nine symmetrical interferometers interleaved with eight asymmetrical interferometers. The performance of the equalizer is evaluated numerically. We confirm experimentally that this equalizer is effective in reducing the pulse waveform deterioration caused by the Dispersion Slope. In addition, the equalizer improves the power penalty of a 200-Gb/s, 100-km, time-division multiplexed optical transmission experiment.
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Dispersion Slope equalising experiment using planar lightwave circuit for 200 gbit s time division multiplexed transmission
Electronics Letters, 1996Co-Authors: K. Takiguchi, S. Kawanishi, Hidehiko Takara, O Kamatani, K Uchiyama, Akira Himeno, K JingujiAbstract:The authors report 200 Gbit/s, 100 km time-division-multiplexed transmission with 2 ps signal pulses using a Dispersion Slope equaliser on a planar lightwave circuit. The pulse distortion caused by the Dispersion Slope is almost completely recovered, and the power penalty is improved by > 4 dB by the equaliser.