The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform
David V Plant - One of the best experts on this subject based on the ideXlab platform.
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Equalization-Enhanced Phase Noise in Stokes-Vector Direct Detection Systems
IEEE Photonics Journal, 2016Co-Authors: Qunbi Zhuge, Mathieu Chagnon, Thang M. Hoang, Meng Xiang, Mohammed Y S Sowailem, Xingyu Zhou, Fangyuan Zhang, David V PlantAbstract:In this work, we provide both numerical and experimental investigations of equalization-enhanced phase noise (EEPN) in Stokes-vector direct detection (SV-DD) systems. We show that the influence of EEPN cannot be neglected in high symbol rate SV-DD systems after transmission over several hundred kilometers of fibers when electronic chromatic dispersion compensation and Lasers with Linewidths of the order of Megahertz are employed. Simulation results are presented to evaluate the dependence of EEPN effects on Laser Linewidth, transmission distance, and symbol rate. Experiments are then conducted in a 56-Gbaud 16-quadrature amplitude modulation (QAM) SV-DD system to demonstrate the EEPN-induced performance degradation after 320-km transmission over standard single mode fiber (SSMF).
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equalization enhanced phase noise in stokes vector direct detection systems
Optical Fiber Communication Conference, 2016Co-Authors: Meng Qiu, Qunbi Zhuge, Mathieu Chagnon, David V PlantAbstract:We numerically show that the Laser Linewidth tolerance of Stokes-vector direct detection systems is limited by equalization-enhanced phase noise (EEPN). We also demonstrate the mitigation of the EEPN influence using maximum likelihood phase compensation.
Zhongmin Yang - One of the best experts on this subject based on the ideXlab platform.
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1 95 μm khz Linewidth single frequency fiber Laser using self developed heavily tm3 doped germanate glass fiber
Optics Express, 2013Co-Authors: Changsheng Yang, Qi Yang, Dongdan Chen, Zhongmin YangAbstract:We demonstrated a kHz-Linewidth single-frequency Laser at 1.95 μm using the self-developed heavily Tm(3+)-doped single-mode germanate glass fiber with the net gain coefficient of 2.3 dB per centimeter. The maximum output power of the stable single longitudinal mode continuous wave Laser is over 200 mW. The slope efficiency measured versus the absorbed pump power is 34.8%, the signal-to-noise ratio is higher than 68 dB and Laser Linewidth is less than 7 kHz. A wavelength-tuning from 1949.55 to 1951.23 nm was also demonstrated based on changing the tension on the fiber Bragg grating outside the cavity.
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low noise single frequency single polarization ytterbium doped phosphate fiber Laser at 1083 nm
Optics Letters, 2013Co-Authors: Weinan Zhang, Changsheng Yang, Xiaoming Wei, Zhouming Feng, Qi Qian, Shaoxiong Shen, Mingying Peng, Qinyuan Zhang, Zhongmin YangAbstract:We present a low noise single-frequency and single-polarization distributed Bragg reflector fiber Laser at 1083 nm by using a 1.8 cm long newly developed ytterbium-doped phosphate single mode glass fiber. The maximum output power is more than 100 mW with a slope efficiency of >29.6%. The signal to noise ratio is higher than 61 dB and the Laser Linewidth of less than 2 kHz is estimated. The obtained relative intensity noise for frequencies of over 4.0 MHz is less than −150 dB/Hz, which approaches the shot noise limit. The achieved linear polarization extinction ratio is more than 30 dB.
Qunbi Zhuge - One of the best experts on this subject based on the ideXlab platform.
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Equalization-Enhanced Phase Noise in Stokes-Vector Direct Detection Systems
IEEE Photonics Journal, 2016Co-Authors: Qunbi Zhuge, Mathieu Chagnon, Thang M. Hoang, Meng Xiang, Mohammed Y S Sowailem, Xingyu Zhou, Fangyuan Zhang, David V PlantAbstract:In this work, we provide both numerical and experimental investigations of equalization-enhanced phase noise (EEPN) in Stokes-vector direct detection (SV-DD) systems. We show that the influence of EEPN cannot be neglected in high symbol rate SV-DD systems after transmission over several hundred kilometers of fibers when electronic chromatic dispersion compensation and Lasers with Linewidths of the order of Megahertz are employed. Simulation results are presented to evaluate the dependence of EEPN effects on Laser Linewidth, transmission distance, and symbol rate. Experiments are then conducted in a 56-Gbaud 16-quadrature amplitude modulation (QAM) SV-DD system to demonstrate the EEPN-induced performance degradation after 320-km transmission over standard single mode fiber (SSMF).
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equalization enhanced phase noise in stokes vector direct detection systems
Optical Fiber Communication Conference, 2016Co-Authors: Meng Qiu, Qunbi Zhuge, Mathieu Chagnon, David V PlantAbstract:We numerically show that the Laser Linewidth tolerance of Stokes-vector direct detection systems is limited by equalization-enhanced phase noise (EEPN). We also demonstrate the mitigation of the EEPN influence using maximum likelihood phase compensation.
Feng-lei Hong - One of the best experts on this subject based on the ideXlab platform.
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spectroscopy and frequency measurement of the 87 sr clock transition by Laser Linewidth transfer using an optical frequency comb
arXiv: Atomic Physics, 2014Co-Authors: Daisuke Akamatsu, Masami Yasuda, Atsushi Onae, Hajime Inaba, Kazumoto Hosaka, Tomonari Suzuyama, Masaki Amemiya, Feng-lei HongAbstract:We perform spectroscopic observations of the 698-nm clock transition in $^{87}$Sr confined in an optical lattice using a Laser Linewidth transfer technique. A narrow-Linewidth Laser interrogating the clock transition is prepared by transferring the Linewidth of a master Laser (1064 nm) to that of a slave Laser (698 nm) with a high-speed controllable fiber-based frequency comb. The Fourier-limited spectrum is observed for an 80-ms interrogating pulse. We determine that the absolute frequency of the 5s$^{2}$ $^{1}$S$_{0}$ - 5s5p $^{3}$P$_{0}$ clock transition in $^{87}$Sr is 429 228 004 229 872.0 (1.6) Hz referenced to the SI second.
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spectroscopy and frequency measurement of the 87sr clock transition by Laser Linewidth transfer using an optical frequency comb
Applied Physics Express, 2014Co-Authors: Daisuke Akamatsu, Masami Yasuda, Atsushi Onae, Hajime Inaba, Kazumoto Hosaka, Tomonari Suzuyama, Masaki Amemiya, Feng-lei HongAbstract:We performed spectroscopic observations of the 698-nm clock transition in 87Sr confined in an optical lattice using a Laser Linewidth transfer technique. A narrow-Linewidth Laser interrogating the clock transition was prepared by transferring the Linewidth of a master Laser (1064 nm) to that of a slave Laser (698 nm) with a high-speed controllable fiber-based frequency comb. The Fourier-limited spectrum was then observed for an 80-ms interrogating pulse. We determined that the absolute frequency of the 5s2 1S0–5s5p 3P0 clock transition in 87Sr is 429 228 004 229 872.0 (1.6) Hz referenced to the SI second.
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spectroscopy of 171yb in an optical lattice based on Laser Linewidth transfer using a narrow Linewidth frequency comb
Optics Express, 2013Co-Authors: Hajime Inaba, Masami Yasuda, Atsushi Onae, Daisuke Akamatsu, Kazumoto Hosaka, Yoshiaki Nakajima, Kana Iwakuni, Sho Okubo, Takuya Kohno, Feng-lei HongAbstract:We propose a novel, high-performance, and practical Laser source system for optical clocks. The Laser Linewidth of a fiber-based frequency comb is reduced by phase locking a comb mode to an ultrastable master Laser at 1064 nm with a broad servo bandwidth. A slave Laser at 578 nm is successively phase locked to a comb mode at 578 nm with a broad servo bandwidth without any pre-stabilization. Laser frequency characteristics such as spectral Linewidth and frequency stability are transferred to the 578-nm slave Laser from the 1064-nm master Laser. Using the slave Laser, we have succeeded in observing the clock transition of 171Yb atoms confined in an optical lattice with a 20-Hz spectral Linewidth.
Lijun Wang - One of the best experts on this subject based on the ideXlab platform.
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CaF2 whispering-gallery-mode-resonator stabilized-narrow-Linewidth Laser.
Optics Letters, 2010Co-Authors: B Sprenger, Harald G L Schwefel, S Svitlov, Zehuang Lu, Lijun WangAbstract:A fiber Laser is stabilized by introducing a calcium fluoride (CaF2) whispering-gallery-mode resonator as a filtering element in a ring cavity. It is set up using a semiconductor optical amplifier as a gain medium. The resonator is critically coupled through prisms, and used as a filtering element to suppress the Laser Linewidth. A three-cornered-hat method is used and shows a stability of 10−11 after 10μs. Using the self-heterodyne beat technique, the Linewidth is determined to be 13kHz. This implies an enhancement factor of 103 with respect to the passive cavity Linewidth.
