The Experts below are selected from a list of 99 Experts worldwide ranked by ideXlab platform

Masanori Koshiba - One of the best experts on this subject based on the ideXlab platform.

  • A novel design for Dispersion compensating photonic crystal fiber Raman amplifier
    IEEE Photonics Technology Letters, 2005
    Co-Authors: Shailendra K. Varshney, Kunimasa Saitoh, Masanori Koshiba
    Abstract:

    This letter presents a novel design for Dispersion compensating photonic crystal fiber (DCPCF) which shows inherently flattened high Raman gain of 19 dB (/spl plusmn/1.2-dB gain ripple) over 30-nm bandwidth. The proposed design module has been simulated through an efficient full-vectorial finite element method. The designed DCPCF has a high negative Dispersion coefficient (-200 to -250 ps/nm/km) over C-band wavelength (1530-1568 nm). The proposed fiber module of 5.2-km length not only compensates the Accumulated Dispersion in conventional single-mode fiber (SMF-28) but also compensates for the Dispersion slope. Hence, the designed DCPCF module acts as the gain-flattened Raman amplifier and Dispersion compensator.

Shailendra K. Varshney - One of the best experts on this subject based on the ideXlab platform.

  • A novel design for Dispersion compensating photonic crystal fiber Raman amplifier
    IEEE Photonics Technology Letters, 2005
    Co-Authors: Shailendra K. Varshney, Kunimasa Saitoh, Masanori Koshiba
    Abstract:

    This letter presents a novel design for Dispersion compensating photonic crystal fiber (DCPCF) which shows inherently flattened high Raman gain of 19 dB (/spl plusmn/1.2-dB gain ripple) over 30-nm bandwidth. The proposed design module has been simulated through an efficient full-vectorial finite element method. The designed DCPCF has a high negative Dispersion coefficient (-200 to -250 ps/nm/km) over C-band wavelength (1530-1568 nm). The proposed fiber module of 5.2-km length not only compensates the Accumulated Dispersion in conventional single-mode fiber (SMF-28) but also compensates for the Dispersion slope. Hence, the designed DCPCF module acts as the gain-flattened Raman amplifier and Dispersion compensator.

Kunimasa Saitoh - One of the best experts on this subject based on the ideXlab platform.

  • A novel design for Dispersion compensating photonic crystal fiber Raman amplifier
    IEEE Photonics Technology Letters, 2005
    Co-Authors: Shailendra K. Varshney, Kunimasa Saitoh, Masanori Koshiba
    Abstract:

    This letter presents a novel design for Dispersion compensating photonic crystal fiber (DCPCF) which shows inherently flattened high Raman gain of 19 dB (/spl plusmn/1.2-dB gain ripple) over 30-nm bandwidth. The proposed design module has been simulated through an efficient full-vectorial finite element method. The designed DCPCF has a high negative Dispersion coefficient (-200 to -250 ps/nm/km) over C-band wavelength (1530-1568 nm). The proposed fiber module of 5.2-km length not only compensates the Accumulated Dispersion in conventional single-mode fiber (SMF-28) but also compensates for the Dispersion slope. Hence, the designed DCPCF module acts as the gain-flattened Raman amplifier and Dispersion compensator.

Sien Chi - One of the best experts on this subject based on the ideXlab platform.

  • dcf based fiber raman amplifiers with fiber grating reflectors for tailoring Accumulated Dispersion spectra
    Optics Communications, 2007
    Co-Authors: Senfar Wen, Sien Chi
    Abstract:

    The fiber Raman amplifier (FRA) using Dispersion-compensation fiber (DCF) as the Raman fiber is studied. Fiber grating reflectors (FGRs) embedded in the amplifier are used to control the travel lengths of the WDM signal channels in the amplifier so that the Accumulated-Dispersion spectra of the signals in the amplifier can be tailored. The amplifier compensating for the Accumulated Dispersions of 86 ITU 100 GHz-spaced WDM signal channels in 100 km TrueWave-RS fiber and providing 20 dB gain for each channel is taken as an example, in which the positions of FGRs in the DCF ranges from 2.18 km to 2.68 km. It is shown that its pump power can be utilized more efficiently than the conventional FRA without FGRs. The FGRs can be written on the DCF or inserted into the DCF by splicing. For the latter case, the pump power and noise figure are respectively increased by about 86.6 mW and 0.2 dB per 0.01 dB loss increment of a splice point.

  • wdm soliton transmission system using Dispersion slope compensators
    IEEE Photonics Technology Letters, 1999
    Co-Authors: Shychaung Lin, Sien Chi, Jengcherng Dung
    Abstract:

    A new scheme of Dispersion slope compensator by writing Bragg gratings at different positions in a Dispersion compensation fiber is proposed for the wavelength division multiplexing soliton transmission system. This scheme can compensate in-line for the Accumulated Dispersion of each channel and suppress the dispersive waves which are caused by the incomplete filtering of the signals of the neighboring channels by using Fabry-Perot or Butterworth filters and the different propagating paths of the signals of the different channels in the Dispersion slope compensator.

Magnus Karlsson - One of the best experts on this subject based on the ideXlab platform.

  • perturbation analysis of nonlinear propagation in a strongly dispersive optical communication system
    Journal of Lightwave Technology, 2013
    Co-Authors: Pontus Johannisson, Magnus Karlsson
    Abstract:

    We discuss an analytical model that predicts the impact of the Kerr nonlinearity in optical communication systems when the signal spectrum is wide and the Accumulated Dispersion during propagation is large. A detailed derivation of this model is given for a generalized system by means of a perturbation analysis of the Manakov equation with attenuation, gain, and third order Dispersion included. As in the case with previous studies, three simplifying assumptions are necessary. These are that (i) the nonlinearity is weak, (ii) the input signal is of a given specific form, and (iii) the signal-noise interaction can be neglected. Under these assumptions, the result is found exactly. We also discuss the accuracy of the analytical result and show that third order Dispersion has a small impact in practice.