Dispersion compensation by differential time delay

Abstract

A technique for optical pre-or postdistortion in order to compensate for fiber dispersion is discussed theoretically. The dispersion compensation device is based on differential time delay for the upper and the lower sideband of the modulated signal. The proposed scheme is primarily intended for high bit rate (> 10 GbiUs) time division multiplexed transmission, and in an ideal case the transmitting distance could be enhanced by a factor of 4 in a dispersive limited system. With more realistic demands on the dispersion compensation device, the gained distance is in the order of 2.5.

Approximate and Exact Small Signal Analysis for Single-Mode Fiber Near Zero Dispersion Wavelength with Higher Order Dispersion

“…o , which is given by [11]: where S in .t / and Á in .t/ are, respectively, the input photon intensity and the input phase. As in Anders and Sahlen [15], the propagation of the signal through an optical ber can be described by propagation term e ¡j¯L with length L of the transmission ber and the propagation constant¯by the relation…”

“…o . As reported in [15][16][17], we neglect the absolute phase (Á o D¯oL), and group delay (d¯=d! D ¿ and corresponds to the F 1 term), because both terms produce only phase delay of the carrier signal and have no in uence on the distortion of the signal.…”

Analysis of Dispersion Compensation using Fiber Bragg Grating in Optical Fiber Communication System

“…Several techniques have been proposed which can be used to overcome power penalty caused due to non linear effects and chromatic dispersion. These include differential delay methods [4], initial pre-chirp [5], dispersion compensating devices [6], mid spam spectral inversion [7][8][9], dispersion supported transmission [10][11][12][13], optical phase conjugation [14][15][16][17][18]. The use of dispersion compensated fiber (DCF) is considered as the best method to mitigate harmful results of dispersion and also to upgrade single mode fiber links which had already been installed.…”

On duty cycle selection of RZ optical pulse to optimize the performance of dispersion compensated 10 Gbps single channel optical communication system using dispersion compensating fibers

“…In fact, for systems operating above 10 Gbps over standard single mode fiber (SSMF), dispersion compensation is mandatory, even for metro distances. A number of methods have been proposed to overcome the impairments caused by chromatic dispersion including initial pre-chirp [2,3], microchip compensation [4], mid-span spectral inversion [5], optical phase conjugation [6][7][8], dispersion-supported transmission [9], dispersion compensating devices [10][11][12] and differential delay method [13][14][15][16][17]. The use of dispersion compensated fiber (DCF) is an important method for dispersion compensation and to upgrade the already installed links of single mode fiber [18,19].…”