DWDM Transmission Based on the Thin-Film Filter Technology

Abstract

DWDM Transmission Based on the Thin-Film Filter Technology A dense wavelength division multiplexing (DWDM) transmission scheme with two thin-film filters (FWHM bandwidth 100 GHz and 200 GHz) has been realized to evaluate the minimum channel interval needed for a satisfactory bit error ratio. For this purpose, detailed research was conducted into the impact of the filters on the optical signal's de-multiplexing in a DWDM system, in which the measurements of eye diagrams and the optical power spectral densities of a received signal were made. From the results of measurements the minimum channel interval has been found for the optical filters that ensures reliable data transmission and higher spectral efficiency of the whole system. It was found that for a DWDM system with a 100 GHz filter a sufficient channel interval is 75 GHz at 10 Gbit/s data transmission speed, which means that its spectral efficiency is increased from 0.1 bit/s/Hz to 0.1333 bit/s/Hz.

Fiber Bragg Grating Technology for New Generation Optical Access Systems

“…The error counting in a practical system for realistically low BER values (< 10 -12 ) can be a long process. Therefore the International Telecommunications union (ITU) has created the eye diagram masks for different bit rates with a definite BER value [28]. …”

Realization of HDWDM Transmission System with the Minimum Allowable Channel Interval

“…An alternative − but equally valid − approach to increasing the data transmission is to decrease the wavelength division multiplexing (WDM) channel spacing to high-dense dimensions while keeping the existing data transmission speed for an exact channel [Ozoliņš et al, 2011, Bobrovs et al, 2009.…”

Optical Communications Systems

“…Such networks have become one of the most important components in the telecommunication hierarchy, whose integration with standard network services and applications promotes rapid evolution of fiber optics and its wide implementation into all telecommunication branches (see Table 1 [McGloin & Reid., 2010] Currently, many research topics in the field of optical transmission systems (mostly grounded on novel modulation techniques) are focused on increasing the total data transmission speed of an individual optical fiber [Abbou et al, 2008, Bhamber et al, 2007, Bobrovs et al, 2008]. An alternative − but equally valid − approach to increasing the data transmission is to decrease the wavelength division multiplexing (WDM) channel spacing to high-dense dimensions while keeping the existing data transmission speed for an exact channel [Ozoliņš et al, 2011, Bobrovs et al, 2009. High performance optical filters make the groundwork for realization of high-speed highdensity WDM (HDWDM) transmission systems [Pfennigbauer & Winzer, 2006].…”