The Experts below are selected from a list of 41718 Experts worldwide ranked by ideXlab platform
Christian Dorrer - One of the best experts on this subject based on the ideXlab platform.
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Simple high-sensitivity, electro-optic sagnac spectral shearing interferometry for short Optical Pulse characterization
2009 Conference on Lasers and Electro-Optics and 2009 Conference on Quantum electronics and Laser Science Conference, 2009Co-Authors: Christian Dorrer, Jake BromageAbstract:A stable Sagnac spectral shearing interferometer generating a 0.7-nm shear and interferograms resolvable with a low-resolution spectrometer is demonstrated for real-time Optical Pulse characterization at microwatt average power.
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linear self referencing techniques for short Optical Pulse characterization invited
Journal of The Optical Society of America B-optical Physics, 2008Co-Authors: Christian Dorrer, I. KangAbstract:Linear self-referencing techniques for the characterization of the electric field of short Optical Pulses are presented. The theoretical and practical advantages of these techniques are developed. Experimental implementations are described, and their performance is compared to the performance of their nonlinear counterparts. Linear techniques demonstrate unprecedented sensitivity and are a perfect fit in many domains where the precise, accurate measurement of the electric field of an Optical Pulse is required.
I. Kang - One of the best experts on this subject based on the ideXlab platform.
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linear self referencing techniques for short Optical Pulse characterization invited
Journal of The Optical Society of America B-optical Physics, 2008Co-Authors: Christian Dorrer, I. KangAbstract:Linear self-referencing techniques for the characterization of the electric field of short Optical Pulses are presented. The theoretical and practical advantages of these techniques are developed. Experimental implementations are described, and their performance is compared to the performance of their nonlinear counterparts. Linear techniques demonstrate unprecedented sensitivity and are a perfect fit in many domains where the precise, accurate measurement of the electric field of an Optical Pulse is required.
Takashi Kurokawa - One of the best experts on this subject based on the ideXlab platform.
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fiber transmission characteristics of Optical short Pulses generated by Optical Pulse synthesizer
Japanese Journal of Applied Physics, 2009Co-Authors: Ken Kashiwagi, Tatsutoshi Shioda, Yuichiro Kodama, Ryo Kobe, Yosuke Tanaka, Takashi KurokawaAbstract:In this study, we experimentally characterize Optical short-Pulse transmission through single-mode fibers. The initial Pulses were precisely generated by an Optical Pulse synthesizer. The Optical Pulse synthesizer provides line-by-line phase and intensity modulations to individual channels in Optical frequency combs and generates precise arbitral Pulses. Pulse shaping enables the experimental evaluation of Pulse transmission along the fibers under various initial Pulse conditions, and the Pulse evolution of Gaussian and sech2 Pulses through standard single-mode fibers (SMFs) was experimentally investigated. The sech2 Pulses had smaller Pulse broadening and distortion than the Gaussian ones at the same Pulse width and peak power. The sech2 Pulses nearly maintained their initial time bandwidth products (TBPs). The required Pulse peak power for soliton transmission matched the theoretical value.
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supercontinuum comb generation using Optical Pulse synthesizer and highly nonlinear dispersion shifted fiber
Japanese Journal of Applied Physics, 2009Co-Authors: Samuel Choi, Tatsutoshi Shioda, Ken Kashiwagi, Yosuke Tanaka, Naoyuki Tamura, Takashi KurokawaAbstract:We propose a novel supercontinuum (SC) generation technology using an Optical Pulse synthesizer and highly nonlinear dispersion-shifted fiber. The Optical Pulse synthesizer enables us to reshape seed Pulses optimized for broadband SC generation. 25.0 and 12.5 GHz SC combs were successfully generated by propagating synthesized seed Pulses in the highly nonlinear fiber. We investigated how seed Pulse conditions including shape, peak power, repetition rate, and center wavelength affect SC spectral bandwidth. We also evaluated interferometric signal waveforms from a Michelson interferometer using the generated SC comb as the light source. Interferometric peak width improved to 35.5 µm when peak power reached 7.9 W for the Gaussian Pulse-based SC comb. Numerical simulation results almost agreed with experimental results. The difference between SC combs generated from Gaussian and sech2 Pulses was confirmed by the simulations.
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analog and digital Optical Pulse synthesizers using arrayed waveguide gratings for high speed Optical signal processing
Journal of Lightwave Technology, 2008Co-Authors: Hiroyuki Tsuda, Tatsutoshi Shioda, Yosuke Tanaka, Takashi KurokawaAbstract:In this paper, analog and digital Optical Pulse synthesizers using high-resolution arrayed-waveguide gratings (AWG) have been developed. The analog type of Optical synthesizer consists of an AWG with an integrated 45deg, curved-surfaced mirror, a 4-f lens system, and an Optically addressable spatial light modulator. The effective frequency resolution is 14.5 GHz. A dispersion compensation experiment is successfully carried out and a transform-limited short Pulse has been obtained. This digital type of Optical synthesizer comprises 30 frequency separated channels with a spacing of 12.5 GHz, where each channel includes an amplitude modulator and a phase modulator. The rectangular-shaped Pulse is generated with this Pulse synthesizer, together with a 12.5-GHz-spacing, Optical frequency comb. The synthesizer can generate an Optical Pulse with any waveform. Moreover, using periodic characteristics of the Pulse synthesizer, a 250-GHz repetition rate Pulse train was generated, in combination with an ultrawideband, waveguide type of Fabry-Perot electrooptic modulator.
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waveform controllable Optical Pulse generation using an Optical Pulse synthesizer
IEEE Photonics Technology Letters, 2006Co-Authors: D Miyamoto, K Mandai, Takashi Kurokawa, S Takeda, Tatsutoshi Shioda, Hiroyuki TsudaAbstract:We have proposed an Optical Pulse synthesizer comprising of Optical modulators and an arrayed waveguide grating. This system can generate arbitrary waveform Pulses in combination with a broad-band Optical frequency comb. We achieved the generation of the Gaussian Pulses with a width of 4.7 ps, double-Gaussian Pulses, and rectangular-shaped Pulses by arbitrary waveform Pulse synthesis, at the high repetition rate of 10 GHz.
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Arbitrary waveform Optical Pulse generation using an Optical Pulse synthesizer
Proceedings of 2005 IEEE LEOS Workshop on Fibres and Optical Passive Components 2005., 2005Co-Authors: D Miyamoto, K Mandai, Hiroyuki Tsuda, Koichi Aizawa, Takashi KurokawaAbstract:We have proposed an Optical Pulse synthesizer, which consists of Optical modulators and an arrayed waveguide grating (AWG). This system can generate arbitrary waveform Pulses in combination with broadband Optical frequency comb. We achieved generation of the Gaussian Pulse with a width of 5.1 ps, double-Gaussian Pulse and rectangular-shaped Pulse as arbitrary waveform Pulse synthesis, at a high repetition rate of 10 GHz.
Hideto Iwaoka - One of the best experts on this subject based on the ideXlab platform.
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ultralow chirping short Optical Pulse 16 ps generation in gain coupled distributed feedback semiconductor lasers
Applied Physics Letters, 1991Co-Authors: R Takahashi, Kunio Tada, H Hosomatsu, Takeshi Kamiya, Yoshiaki Nakano, Hideto IwaokaAbstract:We describe Optical short Pulse generation in novel gain‐coupled distributed feedback (GC‐DFB) semiconductor lasers by using a simple electrically pumped gain switching method. An Optical Pulse as short as 16 ps has been obtained from a 130 ps current Pulse. The most exciting result is that the lasers keep single longitudinal mode oscillation with very low wavelength chirping (∼0.12 nm) during the gain switching operation. From the Optical Pulse width and the amount of the wavelength chirping, we have estimated the α parameter of the GC‐DFB laser to be less than 1.6.
Pierre Voisin - One of the best experts on this subject based on the ideXlab platform.
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single shot initialization of electron spin in a quantum dot using a short Optical Pulse
Physical Review B, 2011Co-Authors: Loïc Lanco, O Krebs, Pascale Senellart, Pierre VoisinAbstract:We propose a technique to initialize an electron spin in a semiconductor quantum dot with a single short Optical Pulse. It relies on the fast depletion of the initial spin state followed by a preferential, Purcell-accelerated desexcitation towards the desired state thanks to a micropillar cavity. We theoretically discuss the limits on initialization rate and fidelity, and derive the Pulse area for optimal initialization. We show that spin initialization is possible using a single Optical Pulse down to a few tens of picoseconds wide.
