Dispersion Compensated Broad Band Optical Communication Link

Introduction

The phenomenal growth of Internet traffic has led to an explosive growth in demand for Bandwidth (BW) and this in turn has led to the need for higher bit transmission rates, longer distances and scalability. At present the key for increasing transmission carrying capacity of an optical fibre lies in employing Dense Wavelength Division Multiplexed) DWDM transmission by transmitting signal using multiple wave lengths offered by optical fiber amplifiers like Erbium Doped Fibre Amplifiers(EDFA) and Thulium Doped Fibre Amplifiers (TDFA). Such transmission has limitations namely chromatic dispersion and nonlinear effects. These are overcome by designing a dispersion compensated broadband fibre optical communication link with a relatively large mode effective area (Aeff) that can reduce sensitivity to nonlinear optical effects.

Salient features:

Average dispersion of the link is substantially reduced compared to that of signal transmission fibre alone; · DCF has mode effective area (A base(eff)) of at least 40 µm (power 2) at the center wave length of a given amplifier band (and greater than 30 µm (power 2) across the overall amplifier band), which is larger than the presently used DCF; · Reduced sensitivity to detrimental nonlinear effects; · Bend loss < 0.1 dB for a single turn of bend diameter of 32 mm for all operating wavelength ranges and within the operating limits; · Mode spot-sizes attained for these fibres are greater than that of the presently used DCF thereby ensuring relatively smaller splice-losses of these DCF's with signal transmission fibers; · Improved performance of the system carrying broadband dispersion compensated links.

Prospective Users: Internet Service Providers, Telecommunication industries

Type of Technology: Device

Keywords: Fibre, Optic, Bandwidth, Wavelength

Developed by : Prof. Thyagarajan/ Dr. K D Pande
Department: Physics

Contact:

Managing Director
Foundation for Innovation and Technology Transfer (FITT)
Indian Institute of Technology, Delhi
Hauz Khas, New Delhi-110016, INDIA
Tel : 91-011-26597167, 26857762, 26581013, 26597153
Fax : 91-011-26851169
E-mail : drkdpn@gmail.com