The Experts below are selected from a list of 252 Experts worldwide ranked by ideXlab platform
Hiroko Oohashi - One of the best experts on this subject based on the ideXlab platform.
-
spectral linewidth reduction in widely wavelength tunable dfb laser array
IEEE Journal of Selected Topics in Quantum Electronics, 2009Co-Authors: H Ishii, K Kasaya, Hiroko OohashiAbstract:We have developed an L-band tunable distributed feedback laser array (TLA) with a new design to reduce the spectral linewidth. A wide wavelength tuning range of ~ 40 nm is obtained with a high Fiber Output power of 20 mW and a high side-mode suppression ratio of >50 dB in the TLA module. A narrow linewidth of less than 580 kHz is achieved over the entire tuning range. Furthermore, we investigated the causes of linewidth variation. We found that a TLA with a longer cavity is more tolerant to external feedback, which reduces the variation in linewidth.
-
reduced spectral linewidth 0 6 mhz in l band wavelength tunable dfb laser array
International Semiconductor Laser Conference, 2008Co-Authors: H Ishii, K Kasaya, Hiroko OohashiAbstract:A wavelength tunable DFB laser array is fabricated with a new design for spectral linewidth reduction. A narrow linewidth of <0.6 MHz is obtained over the entire tuning range (~40 nm) with a high Fiber Output power of 20 mW.
-
widely wavelength tunable dfb laser array integrated with funnel combiner
IEEE Journal of Selected Topics in Quantum Electronics, 2007Co-Authors: H Ishii, K Kasaya, Hiroko Oohashi, Yasuo Shibata, Hiroshi Yasaka, Katsunari OkamotoAbstract:A wavelength-tunable distributed feedback (DFB) laser array integrated with a funnel combiner is described. Two types of optical combiner, namely a multimode interferometer (MMI) combiner and a funnel combiner, are compared theoretically and experimentally. It is shown that the funnel combiner is superior in terms of wavelength dependence and fabrication tolerance. The laser module covers the full C-band wavelength range ( ~38 nm), and a high Fiber Output power of 40 mW (16 dBm) is obtained with stable single-mode operation.
H Ishii - One of the best experts on this subject based on the ideXlab platform.
-
spectral linewidth reduction in widely wavelength tunable dfb laser array
IEEE Journal of Selected Topics in Quantum Electronics, 2009Co-Authors: H Ishii, K Kasaya, Hiroko OohashiAbstract:We have developed an L-band tunable distributed feedback laser array (TLA) with a new design to reduce the spectral linewidth. A wide wavelength tuning range of ~ 40 nm is obtained with a high Fiber Output power of 20 mW and a high side-mode suppression ratio of >50 dB in the TLA module. A narrow linewidth of less than 580 kHz is achieved over the entire tuning range. Furthermore, we investigated the causes of linewidth variation. We found that a TLA with a longer cavity is more tolerant to external feedback, which reduces the variation in linewidth.
-
reduced spectral linewidth 0 6 mhz in l band wavelength tunable dfb laser array
International Semiconductor Laser Conference, 2008Co-Authors: H Ishii, K Kasaya, Hiroko OohashiAbstract:A wavelength tunable DFB laser array is fabricated with a new design for spectral linewidth reduction. A narrow linewidth of <0.6 MHz is obtained over the entire tuning range (~40 nm) with a high Fiber Output power of 20 mW.
-
widely wavelength tunable dfb laser array integrated with funnel combiner
IEEE Journal of Selected Topics in Quantum Electronics, 2007Co-Authors: H Ishii, K Kasaya, Hiroko Oohashi, Yasuo Shibata, Hiroshi Yasaka, Katsunari OkamotoAbstract:A wavelength-tunable distributed feedback (DFB) laser array integrated with a funnel combiner is described. Two types of optical combiner, namely a multimode interferometer (MMI) combiner and a funnel combiner, are compared theoretically and experimentally. It is shown that the funnel combiner is superior in terms of wavelength dependence and fabrication tolerance. The laser module covers the full C-band wavelength range ( ~38 nm), and a high Fiber Output power of 40 mW (16 dBm) is obtained with stable single-mode operation.
K Kasaya - One of the best experts on this subject based on the ideXlab platform.
-
spectral linewidth reduction in widely wavelength tunable dfb laser array
IEEE Journal of Selected Topics in Quantum Electronics, 2009Co-Authors: H Ishii, K Kasaya, Hiroko OohashiAbstract:We have developed an L-band tunable distributed feedback laser array (TLA) with a new design to reduce the spectral linewidth. A wide wavelength tuning range of ~ 40 nm is obtained with a high Fiber Output power of 20 mW and a high side-mode suppression ratio of >50 dB in the TLA module. A narrow linewidth of less than 580 kHz is achieved over the entire tuning range. Furthermore, we investigated the causes of linewidth variation. We found that a TLA with a longer cavity is more tolerant to external feedback, which reduces the variation in linewidth.
-
reduced spectral linewidth 0 6 mhz in l band wavelength tunable dfb laser array
International Semiconductor Laser Conference, 2008Co-Authors: H Ishii, K Kasaya, Hiroko OohashiAbstract:A wavelength tunable DFB laser array is fabricated with a new design for spectral linewidth reduction. A narrow linewidth of <0.6 MHz is obtained over the entire tuning range (~40 nm) with a high Fiber Output power of 20 mW.
-
widely wavelength tunable dfb laser array integrated with funnel combiner
IEEE Journal of Selected Topics in Quantum Electronics, 2007Co-Authors: H Ishii, K Kasaya, Hiroko Oohashi, Yasuo Shibata, Hiroshi Yasaka, Katsunari OkamotoAbstract:A wavelength-tunable distributed feedback (DFB) laser array integrated with a funnel combiner is described. Two types of optical combiner, namely a multimode interferometer (MMI) combiner and a funnel combiner, are compared theoretically and experimentally. It is shown that the funnel combiner is superior in terms of wavelength dependence and fabrication tolerance. The laser module covers the full C-band wavelength range ( ~38 nm), and a high Fiber Output power of 40 mW (16 dBm) is obtained with stable single-mode operation.
Philip St J Russell - One of the best experts on this subject based on the ideXlab platform.
-
continuously wavelength tunable high harmonic generation via soliton dynamics
Optics Letters, 2017Co-Authors: Francesco Tani, Michael H Frosz, J C Travers, Philip St J RussellAbstract:We report the generation of high harmonics in a gas jet pumped by pulses self-compressed in a He-filled hollow-core photonic crystal Fiber through the soliton effect. The gas jet is placed directly at the Fiber Output. As the energy increases, the ionization-induced soliton blueshift is transferred to the high harmonics, leading to emission bands that are continuously tunable from 17 to 45 eV.
-
continuously wavelength tunable high harmonic generation via soliton dynamics
arXiv: Optics, 2017Co-Authors: Francesco Tani, Michael H Frosz, J C Travers, Philip St J RussellAbstract:We report generation of high harmonics in a gas-jet pumped by pulses self-compressed in a He-filled hollow-core photonic crystal Fiber through the soliton effect. The gas-jet is placed directly at the Fiber Output. As the energy increases the ionization-induced soliton blue-shift is transferred to the high harmonics, leading to a emission bands that are continuously tunable from 17 to 45 eV.
Raj Rao Nadakuditi - One of the best experts on this subject based on the ideXlab platform.
-
mode control in a multimode Fiber through acquiring its transmission matrix from a reference less optical system
Optics Letters, 2018Co-Authors: Moussa Ngom, Theodore B Norris, E Michielssen, Raj Rao NadakuditiAbstract:A simple imaging system, together with complex semidefinite programming, is used to generate the transmission matrix (TM) of a multimode Fiber. Once the TM is acquired, we can modulate the phase of the input signal to induce strong mode interference at the Fiber Output. The optical design does not contain a reference arm, no internal reference signal is used, and no interferometric measurements are required. We use a phase-only spatial light modulator to shape the profile of the propagating modes, and the Output intensity patterns are collected. The semidefinite program uses a convex optimization algorithm to generate the TM of the optical system using intensity only measurements. This simple, yet powerful, method can be used to compensate for modal dispersion in multimode Fiber communication systems. It also yields great promise for the next generation biomedical imaging, quantum communication, and cryptography.
-
mode control in a multimode Fiber through acquiring its transmission matrix from a reference less optical system
arXiv: Optics, 2017Co-Authors: Moussa Ngom, Theodore B Norris, E Michielssen, Raj Rao NadakuditiAbstract:A simple imaging system together with complex semidefinite programming is used to generate the transmission matrix of a multimode Fiber. Once the transmission matrix is acquired, we can modulate the phase of the input signal to induce strong mode interference at the Fiber Output. The optical design does not contain a reference arm and no interferometric measurements are required. We use a phase-only spatial light modulator to shape the profile of the propagating modes and the Output intensity at an individual pixel is monitored. The semidefinite program uses a convex optimization algorithm to generate the transmission matrix of the optical system using intensity only measurements. This simple yet powerful method can be used to compensate for modal dispersion in multimode Fiber communication systems. It also yields great promises for the next generation biomedical imaging, quantum communication, and cryptography.