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.

Polarization Mode Dispersion in an Elliptical Liquid Crystal-Core Fiber

Abstract: Polarization phenomena in an elliptical liquid crystal-core fiber at third optical window, i.e., close to 1550 nm have been investigated. This includes direct measurement of polarization mode dispersion and the beat-length parameter. The elliptical liquid crystal-core fiber contained a nematic mixture characterized by extremely low values of refractive indices.

A dynamical polarization mode dispersion emulator

Abstract: A polarization mode dispersion (PMD) emulator is presented which accurately follows the dynamics of PMD in field optical fiber. A modification on a dynamic mode coupling wave-plate model is presented to model the emulator. It is found that the emulator and model can accurately describe the dynamical behavior of the state of polarization and thus PMD in a field fiber. The emulator is shown to be repeatable. Generally, the dynamical PMD emulator is shown to cause more realistic bit-error-rate degradation than a classical PMD emulator.

Polarization mode dispersion measuring instrument and method

Abstract: A polarization mode dispersion measuring apparatus includes a variable wavelength light source for providing light of a variety of wavelengths; a light intensity modulator optically connected to the light source to provide light of modulated intensity; a polarization controller optically connected to the light intensity modulator to provide light of controlled polarization; a beam splitter optically connected to the polarization controller to provide beams of p and s polarization components; an O/E conversion unit optically connected to the beam splitter to provide electrical signals with respect to the beams of the p and s polarization components; and an analyzing unit for controlling the light intensity modulator to provide a sine wave of a predetermined frequency and a predetermined intensity, and the light source and the polarization controller to determine parameters of Jones matrix from the electrical signals and a polarization mode dispersion defined by the parameters, thereby measuring a polarization mode dispersion of an object placed between the polarization controller and the beam splitter.

Self-coherent optical transport systems

Abstract: Publisher Summary This chapter is a comprehensive and in-depth treatment of self-coherent transmission systems, including theoretical considerations, receiver technologies, modulation formats, and adaptive equalization techniques. Self-coherent optical transmission based on differential phase-shift keying (DPSK) and direct detection has emerged as an attractive vehicle for supporting high-speed optical transport networks by offering lower requirements on optical signal-to-noise ratio (OSNR) and higher tolerance to system impairments such as fiber nonlinear effects and coherent crosstalk, as compared to traditional on-off keying (OOK)-based transmission. Multilevel DPSK formats such as differential quadrature phase-shift keying (DQPSK) additionally offer high spectral efficiency and high tolerance to chromatic dispersion (CD), polarization mode dispersion (PMD), and optical filtering. Various self-coherent modulation formats and their detection schemes are presented in this chapter. The most basic one is DBPSK, which can be generated by a single-waveguide phase modulator or a Mach–Zehnder Modulator (MZM) configured for phase modulation. There are two common types of modulators to effectively realize phase modulation. The single-waveguide phase modulator has the advantage of low loss, no need for bias control, and absence of modulator bandwidth limitation-induced signal amplitude fluctuations. Particularly, the digital self-coherent receiver and its potential capabilities in mitigating transmission impairments are discussed in the chapter. Self-coherent optical transport systems, promising many benefits not possible with traditional OOK-based systems, are expected to find a wide range of applications to meet the ever- increasing demand of capacity upgrade and cost reduction in future optical networks. Compared to traditional OOK, self-coherent optical modulation and detection schemes offer higher signal immunity to one or more of these impairments and are being used for many state-of-the-art optical transport systems.

Experimental observation of orthogonally polarized time-delayed optical soliton trapping in birefringent fibers.

Abstract: Propagation of two orthogonally polarized time-delayed optical solitons in low-birefringence optical fiber is studied experimentally. We demonstrate soliton trapping and collisions and also the ability to control the separation and shape of soliton pulses by varying the power at the input of the fiber.