Author : J. Kbashi, Hani
journal of kerbala university,
2010, Volume 6, Issue 3, Pages 55-59
The Wavelength Division Multiplexing WDM is a technology used to expand fiber optic bandwidth by enabling signals from different sources to independently travel together on a single optical fiber. The purpose of the work is to increase the link distance between two Ethernet LANs by using the single optical fiber link for both directions of transmission (i.e. one fiber for transmission and reception) since the maximum link distance is limited upto 100m. The link utilizes the Wavelength Division Multiplexing -WDM technique. A bidirectional link was implemented using two port wavelength division multiplexing components (that includes a wavelength division multiplexer and a wavelength division demultiplexer) with optical sources of wavelengths of 1550 nm and 1310 nm. An Ethernet to optical fiber converter card was designed and implemented for the purpose of converting the electrical signal to an optical signal suitable for the transmission over the optical fiber for utilizing the optical fiber transmission characteristics. The implemented system worked correctly. Twelve pieces of single mode optical fiber were used in the work each of length of 5.1 km and they connected with each others by splices each of losses of 1 dB. The total link distance become 61.2 km.
The Bit Error Rate- BER of the full duplex system was investigated as well as the effect of dispersion on the system. From the results it was concluded that the system was not limited by the dispersion effect.