Topic
Polarization mode dispersion
About: Polarization mode dispersion is a research topic. Over the lifetime, 5147 publications have been published within this topic receiving 80055 citations. The topic is also known as: PMD.
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TL;DR: This work proposes a simple and efficient channel parameter estimation scheme for MLSD based on Volterra kernel modeling of the nonlinear distortion of the electrical postdetection signals.
Abstract: Maximum likelihood sequence detection (MLSD) is the most effective electrical domain equalization scheme for mitigating dispersive optical channel impairments such as chromatic dispersion or polarization-mode dispersion. Parameter estimation for MLSD is not straightforward in optical communication systems due to the square-law nature of photodiodes. We propose a simple and efficient channel parameter estimation scheme for MLSD based on Volterra kernel modeling of the nonlinear distortion of the electrical postdetection signals.
22 citations
TL;DR: In this article, a depolarizer based on a collection of half-wave plates with randomly distributed optic axes is proposed, which is demonstrated by means of dynamically photopatterning liquid crystal into randomly aligned homogeneous domains.
Abstract: We propose a depolarizer based on the principle of a collection of half-wave plates with randomly distributed optic axes. The design is demonstrated by means of dynamically photopatterning liquid crystal into randomly aligned homogeneous domains. We characterize the liquid crystal depolarizer for 1550 nm and C-band (1520–1610 nm). A degree of polarization of less than 5% is obtained for any linearly polarized light. This study provides a practical candidate for high-performance depolarizers.
22 citations
Patent•
29 Dec 1993TL;DR: An optical isolator as discussed by the authors utilizes a pair of polarization selective elements, as for example birefringent wedges, and all integral Faraday rotator aligned therewith to perform optical signal isolation without introducing the polarization mode dispersion inherent in conventional polarization independent optical isolators.
Abstract: An optical isolator utilizes a pair of polarization selective elements, as for example birefringent wedges, and all integral Faraday rotator aligned therewith to perform optical signal isolation without introducing the polarization mode dispersion inherent in conventional polarization independent optical isolators. Optical isolation is accomplished by passing a forward-directed optical signal through a first birefringent element which separates the optical signal into two orthogonal states. The two orthogonal polarization states exchange identities upon entering the second birefringent element from the Faraday rotation element and are again deflected by the second birefringent element so that they emerge from the second element parallel to each other and, having traveled the same optical path length, witllout any polarization mode dispersion. Both polarization states of the reverse propagating optical signal are sufficiently angularly deflected to avoid coupling with the optical signal path.
22 citations
17 Mar 2002
TL;DR: In this paper, a simple technique to monitor the first-order PMD and GVD in WDM networks was proposed and demonstrated, which consisted of two photodiodes, an RF bandpass filter, and an RF power detector.
Abstract: We proposed and demonstrated a simple technique to monitor the first-order PMD and GVD in WDM networks. The monitoring module consisted of two photodiodes, an RF bandpass filter, and an RF power detector. The proposed technique could measure the PMD and GVD of each channel with accuracy better than /spl plusmn/2.5 ps and /spl plusmn/30 ps/nm, respectively. Thus,we believe that the proposed monitoring technique is well suited for the use in PMD and GVD compensations.
22 citations
TL;DR: In this paper, the effects of the coupling coefficient dispersion (or intermodal dispersion) in the fiber, which have been overlooked in previous studies of three-core and four-core fibers, were analyzed theoretically by solving a set of generalized, linearly coupled nonlinear Schrodinger equations.
Abstract: Nonlinear switching of ultrashort pulses in two-core, three-core, and four-core optical fibers is analyzed theoretically by solving a set of generalized, linearly coupled nonlinear Schrodinger equations. The analysis takes into account the effects of the coupling coefficient dispersion (or intermodal dispersion) in the fiber, which have been overlooked in previous studies of three-core and four-core fibers. It is shown that the coupling coefficient dispersion can break up ultrashort pulses over a short length of a multicore fiber and consequently deteriorate the switching characteristics. In general, the coupling coefficient dispersion leads to an increase in the switching power and a reduction in the switching contrast and the sharpness of the switching transition. The three-core fiber is more tolerant to the coupling coefficient dispersion and therefore the preferred choice for the implementation of an all-fiber nonlinear optical switch.
22 citations