Dispersion-flattened-fiber based optical thresholder for multiple-access-interference suppression in OCDMA system

Abstract

An optical thresholding technique based on super-continuum generation in dispersion flattened fiber is proposed and experimentally demonstrated to enable data-rate detection in optical code division multiple access networks. The proposed scheme exhibits an excellent discrimination between a desired signal and interference signals with features of pulse reshaping, low insertion loss, polarization independency as well as reasonable operation power.

Evaluation of OCDM-Switching and Code Conversion for All-Optical End-to-End Path Provisioning in Multi-granularity Networks

“…By using 3R (Reshaping, Retiming, Reamplification) technology, the original bit stream can be obtained after optical correlation. For example, an optical thresholder has been proposed to reshape decoded signal with MAI noise to achieve better BER performance [16]. In our paper, we will not take the physical impairment into account like many studies in WDM networks only dealing with the ideal case, to make the OCDM-LSP provisioning more straightforward.…”

Effect of Filter Parameters on a Supercontinuum-Based All-Optical Tunable Thresholder

“…AOTs based on a nonlinear-optical loop mirror (NOLM) [3][4][5] and nonlinear polarization rotation (NPR) [6] have been proposed for this application. A supercontinuum [7] -based AOT has been proposed for optical self-switching, where a step power transmission function is required [8,9]. We should note that the power transfer function is defined as the function of output power versus input power, while the power transmission function is the function of output-to-input-power ratio versus input power.…”

“…Optical self-switching can be used to suppress multiple-access interference noise in an optical code-division multiple-access system [8,9], and in optical regeneration [7,10]. The supercontinuum-based AOT has a simple structure and is insensitive to polarization.…”

Numerical study of photonic crystal fiber with ultra-flattened chromatic dispersion in anomalous and normal dispersion regimes

“…Other structures have been designed for working in a wide range of wavelengths in the area with zero chromatic dispersion wavelength (ZDW) [5][6][7][8]. The PCF with flattened dispersion in a wide range can be used in a wide field of engineering applications such as wide-band supercontinuum generation, dispersion compensation, ultra-short soliton pulse transmission, optical parametric amplification, wavelength-division multiplexing transmission, pulse reshaping or as a candidate for nonlinear optical processes [6][7][8][9][10][11][12]. This design of an Aureus-PCF (Au-PCF with the pitch value of 1.618 m) is particularly attractive because it contains a small number of rings, high sensitivity for controlling the chromatic dispersion by only changing the diameter of the third, fourth rings (or both at the same time) according to the application and type of dispersion needed (anomalous or normal dispersion), keeping an ultra-high flattened chromatic dispersion in a wide spectrum of wavelengths.…”