The Experts below are selected from a list of 50229 Experts worldwide ranked by ideXlab platform
K Hattori - One of the best experts on this subject based on the ideXlab platform.
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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.
William Shieh - One of the best experts on this subject based on the ideXlab platform.
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maximum likelihood phase and channel estimation for coherent optical ofdm
IEEE Photonics Technology Letters, 2008Co-Authors: William ShiehAbstract:We present a channel model for a coherent optical orthogonal frequency-division-multiplexed (CO-OFDM) system including linear fiber dispersion effects and noises from optical amplifiers and intercarrier interference induced by laser phase noise. Based upon this model, we derive maximum-likelihood (ML) phase estimation and channel estimation for the CO-OFDM system. Both computer simulation and Transmission Experiment of the CO-OFDM system show that the ML decision-feedback following pilot-assisted phase estimation gives the optimal performance.
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Transmission Experiment of multi-gigabit coherent optical OFDM systems over 1000 km SSMF fibre
Electronics Letters, 2007Co-Authors: William Shieh, Xingwen Yi, Yan TangAbstract:The first proof-of-concept Experimental demonstration of coherent optical OFDM systems is reported. 128 OFDM subcarriers with a nominal data-rate of 8 Gbit/s are successfully processed and recovered after 1000 km Transmission through SSMF fibre without optical dispersion compensation.
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Phase Estimation for Coherent Optical OFDM
IEEE Photonics Technology Letters, 2007Co-Authors: Xingwen Yi, William Shieh, Yan TangAbstract:Phase estimation is one of the enabling functionalities in coherent optical orthogonal frequency-division-multiplexing (CO-OFDM) receivers. In this letter, we compare pilot-aided and data-aided phase estimation methods for a CO-OFDM Transmission Experiment at 8 Gb/s over 1000-km standard single-mode fiber without optical dispersion compensation. We also show that as few as five subcarriers are sufficient for pilot-aided phase estimation
T Imai - One of the best experts on this subject based on the ideXlab platform.
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long haul 16 x 10 gb s wdm Transmission Experiment using higher order fiber dispersion management technique
IEEE Photonics Technology Letters, 1999Co-Authors: M Murakami, H Maeda, T ImaiAbstract:We propose a dispersion management scheme for long-haul wavelength-division-multiplexed (WDM) Transmission systems that considers not only second-, but also third-order dispersion using Transmission fibers with opposite dispersion signs; it eliminates waveform distortion due to the existence of third-order dispersion with reducing interchannel interaction caused by fiber nonlinearity. With this technique, WDM Transmission with a total capacity of 160 Gb/s is demonstrated over 9412 km.
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transoceanic twelve 10 gbit s wdm signal Transmission Experiment with individual channel dispersion and gain compensation and prechirped rz pulse format
Electronics Letters, 1997Co-Authors: M Murakami, N Ohkawa, H Maeda, T Takahashi, T ImaiAbstract:The authors demonstrate WDM signal Transmission of a total capacity of 120 Gbit/s over 6240 km. Fibre dispersion and amplifier gain are optimised by using individual data channel compensators. It is also shown that applying prechirping to the return-to-zero pulses can improve the SNR by /spl sim/2 dB.
K. Takiguchi - One of the best experts on this subject based on the ideXlab platform.
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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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higher order dispersion equaliser of dispersion shifted fibre using a lattice form programmable optical filter
Electronics Letters, 1996Co-Authors: K. Takiguchi, S. Kawanishi, Hidehiko Takara, K Okamoto, K Jinguji, Y OhmoriAbstract:The higher order (third order) dispersion of dispersion shifted fibre has been successfully compensated by using a lattice-form programmable filter fabricated on a planar lightwave circuit. The equaliser offers a dispersion slope of -15.8 ps/nm/sup 2/ over 170 GHz in the 1.55 /spl mu/m region. The effectiveness of the equaliser has been confirmed by the pulse Transmission Experiment in which the trailing ripples of pulses caused by the higher order dispersion of 300 km dispersion shifted fibre have been eliminated.
J M P Delavaux - One of the best experts on this subject based on the ideXlab platform.
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integrated optics erbium ytterbium amplifier system in 10 gb s fiber Transmission Experiment
IEEE Photonics Technology Letters, 1997Co-Authors: J M P Delavaux, S Granlund, O Mizuhara, L D Tzeng, D Barbier, M Rattay, F St Andre, A KevorkianAbstract:We report the full characterization of a pigtailed erbium-ytterbium codoped planar glass waveguide amplifier module. With a single 980-nm diode pump, this ion-exchanged 4.5-cm-long device delivers a signal gain of 16.5 dB, a noise figure of 5 dB, and a saturated output power of 12.5 dBm. To verify its practicality and stability, we tested this module as a power booster in a 10 Gb/s Transmission system Experiment at the 1534 nm wavelength, and demonstrated the successful bit-error-rate (BER<10/sup -12/) Transmission over 72.5 km of dispersion shifted fiber.
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stable single mode erbium fiber grating laser for digital communication
Journal of Lightwave Technology, 1993Co-Authors: Victor Mizrahi, D J Digiovanni, Robert M Atkins, S G Grubb, Yongkwan Park, J M P DelavauxAbstract:In this paper we report the fabrication of a short, robust, single-mode Er/sup 3+/ fiber-grating laser. This laser is proven by the successful outcome of a long-term bit-error-rate test at the 10/sup -15/ level in a 5- G/s fiber Transmission Experiment. In the process we present a new pumping geometry, the elucidation of one origin of relaxation oscillations that have plagued previous lasers and the demonstration of a simple electronic feedback scheme for suppressing them. This prototype source shows real promise for use in a high-speed communications system. >
