A Dispersion Flattening Dispersion Compensating Fiber Design for Broadband Dispersion Compensation

Abstract

An efficient dispersion compensating fiber (DCF) design is proposed based on a coaxial fiber structure, which provides dispersion compensation over a broad wavelength region matching that of an erbium-doped fiber amplifier gain spectrum. The design can provide dispersion coefficient that is nearly twice those of existing DCF designs. Due to the basic nature of the dispersion curve of this design, the total link dispersion cannot only be compensated but also can be flattened.Keywords dispersion compensating fiber, broadband dispersion com pensation, coaxial optical fiber Upgradation of the installed 1310 nm optimized optical fiber links for operation at 1550 nm is attracting considerable interest. The relatively high value of a dispersion coefficient of a 1310 nm optimized fiber operation at 1550 nm can be compensated by employing various schemes of dispersion compensation [1]. Currently, one of the most attractive options to achieve dispersion compensation seems to be the use of a large negative dispersion singlemode fiber which is more commonly known as dispersion compensating fiber [2][3][4]. Furthermore, one of the most attractive options available for increasing the information carrying capacity in a fiber network is to employ wavelength division multiplexing (WDM) technique, i.e., by simultaneously sending signals at multiple wavelengths. This concept has become more attractive because of the availability of the EDFAs, which can provide broadband gain over about 30 nm between 1530 and 1560 nm [5][6][7][8]. In order to use multiple wavelengths in the nonzero dispersion shifted fiber (NDSF), the DCF should be able to provide dispersion compensation at all the operating wavelengths simultaneously. The matched-clad DCFs have a positive dispersion slope similar to that of an NDSF operating in the 1550 nm wavelength 21

Cascaded higher-order soliton for non-adiabatic pulse compression

“…The dispersive properties of PCFs are very sensitive to the air-hole diameter and the hole-to-hole spacing [27], which indicates an attractive property of great controllability of chromatic dispersion in the PCF. Controllability of chromatic dispersion is a very important problem in optical communication systems [28], dispersion compensation [29], and nonlinear optics [30,31]. So far, various PCFs with remarkable dispersion properties have been studied both experimentally and numerically [32,33].…”

Modeling dispersion in optical fibers: applications to dispersion tailoring and dispersion compensation

“…Thus if the cores are brought closer together, their interaction increases leading to a reduction in the magnitude of dispersion with a corresponding increase in the bandwidth. Thus dual concentric core fibers can also be appropriately designed for application in WDM systems [58]. This route has been pursued to achieve broadband dispersion compensation in G.652 fibers in the S-, C-, and L-bands to achieve a DSCF [59].…”

“…Net average residual dispersion of about 100 km of G.652 fiber joined with the designed dual-core DSCFs (in approximately 10:1 ratio) in the S-, C-and L-bands (after[58]). …”

Dispersion compensation optical fiber modules for 40 Gbps WDM communication systems

“…After a long transmission distance, the accumulated positive dispersion becomes big, which results in the reduction of the signal to noise ratio (SNR), an increase in bit error rate, and deterioration in the system performance. Therefore, we must design a kind of DCF that can compensate for the accumulated positive dispersion, which has negative dispersion and a negative dispersion slope in the operation wavelength range [11][12][13][14][15][16].…”