Upgrading a 20 Gbps DWDM system to 160 Gbps system using add/drop multiplexers and couplers

摘要

This paper demonstrates the transformation of 20 Gbps DWDM system to 160 Gbps system using Add/drop multiplexer with couplers for enhancing the capacity of system. In this paper DWDM system with 2 channel at transmitter section each having bit rate 10 Gbps transformed into 16 channel each having bit rate 10 Gbps at receiver section by using couplers coupling the optical signal from add/drop multiplexer section where various frequencies dropped or added on demand. In Add/drop Mux section frequencies are dropped or added with equal channel spacing that is 0.8ns. The couplers used having coupling coefficient 0.5 which couples the signal into different couplers and then into different receivers. The performance of system are evaluated in terms of BER, eye height and quality factor. The system provides good and favourable result and performed better up to 180 km fiber link length.