Zhi Jiang

Tsinghua University, Beijing, Beijing Shi, China

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Publications (6)4.59 Total impact

  • Zhi Jiang, Chongcheng Fan
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    ABSTRACT: A comprehensive study of XPM- and SRS-induced crosstalk noise evolution as well as their interaction along lossy, nonlinear dispersive fiber in a cascaded IM-DD system is performed analytically and numerically. XPM-induced intensity noise (XPMN) comes mainly from few adjacent channels, featuring in higher frequency and higher noise power per contributing channel; while SRS-induced intensity noise (SRSN) comes mainly from all the distant channels, featuring in lower frequency and lower noise power per contributing channel. Interaction between XPMN and SRSN depends on the relative wavelength location between pump and probe as well as dispersion management scheme, and may add either constructively or destructively. SRSN may even exceed XPMN in some cases. In a system with complete dispersion compensation in each span, XPMN, SRSN, and their interaction are all proportional to the square of span number. In dispersion-managed systems, SRSN can be enhanced significantly by resonance effect between fiber spans. On the other hand, XPMN can be markedly suppressed by dispersion management, due mainly to much weaker phase-to-intensity noise conversion through residual dispersion.
    Journal of Lightwave Technology 05/2003; · 2.56 Impact Factor
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    ABSTRACT: Abrupt power transience in wide (C+L)-band dense wavelength division multiplexing systems caused by stimulated Raman scattering during channel add/drop is investigated both theoretically and experimentally. It is found that adding L- or C-band channels leads to abrupt decrease or increase in surviving C- or L-band channels and is constructively or destructively added to the asymptotic transience in a system using backward-pumped fiber Raman amplifiers. Dropping of L- or C-band channels also leads to reversed consequences. The impact of channel add/drop on the steady-state Raman gain in such systems is also investigated.
    IEEE Photonics Technology Letters 10/2002; · 2.04 Impact Factor
  • Zhi Jiang, Qian Yu, Chongcheng Fan
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    ABSTRACT: Based on the weak intensity/phase modulation transfer matrix H, a matrix V for intensity noise (IN) and phase noise (PN) evolution along nonlinear, dispersive and lossy fiber is derived, while matrix description makes it especially useful in noise evolution analysis in systems with chained optical amplifiers. Evolution of two noise sources, laser phase noise and ASE of EDFA, is examined in detail through V. IN, PN and optical field noise spectral densities are studied uniformly. Correspondingly, electrical signal-to-noise ratio (SNRe), equivalent linewidth ((Delta) (upsilon) eq and optical signal-to-noise ratio (SNRo) are used to characterize system performance. It is found that for IM systems, an optimal P0 corresponding to minimum SNRe exists in positive dispersion fibers, and input optical power cannot be arbitrarily increased to improve SNRe even though only noise is considered. On the contrary, in negative dispersion fibers, SNRe is improved with increasing P0 monotonously. For PM systems with negligible laser phase noise and regardless of the sign of fiber dispersion, an optimal optical power also exists to ensure minimum phase noise. SNRo, a combined contribution from intensity and phase noise, is better in fibers with negative dispersion than that in fibers with positive dispersion under the same P0.
    Proc SPIE 10/2001;
  • Zhi Jiang, Qian Yu, Chongcheng Fan
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    ABSTRACT: A rigorous analytical transmission matrix H for optical wave with weak modulation, including intensity modulation (IM) and phase modulation (PM), is derived considering the fiber nonlinearity, dispersion and loss based on the physical process. Four elements of matrix H correspond to conversions of IM->IM, PM->IM, IM->PM and PM->PM, respectively and the nonlinear components are extensively investigated. Physical insight of transmission effects is obtained explicitly. Matrix description makes it especially useful in the design and analysis of chained optical amplifier systems.
    Proc SPIE 10/2001;
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    ABSTRACT: It is found that the down-shoot portion of power transients from gain-clamped EDFAs (erbium doped fiber amplifiers) is the major cause for the deterioration of the receiver bit error ratio, even in systems free of fiber nonlinearity and OSNR degradation. The influence on a 10 Gb/s system is more serious than on a 2.5 Gb/s system
    Communication Technology Proceedings, 2000. WCC - ICCT 2000. International Conference on; 02/2000
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    ABSTRACT: In an all-optical link-controlled wavelength-division multiplexing system, the compensating signal generated by a ring-laser structure in the first EDFA may induce strong stimulated Brillouin scattering (SBS) through intermittent bursts of single longitudinal mode oscillation. However, it can be suppressed effectively by an acousto-optic modulator (AOM) inserted in the lasing loop. Multiple longitudinal mode oscillation of compensating light is constantly kept by random interplay between phonons and photons, leading to much higher SBS threshold power
    Communication Technology Proceedings, 2000. WCC - ICCT 2000. International Conference on; 02/2000