Design of an optical fiber link employing QPSK format with SCM scheme

The multiplexing technique used in this paper offers many advantages over the traditional multiplexing techniques such as the ability to carry larger capacity in the same bandwidth, the cost-effectiveness of the components and higher service modularity. The quadrature phase shift keying (QPSK) format with sub-carrier multiplexing (SCM) scheme will allow a larger capacity to be transmitted as each waveform represents two bits. In this paper the performance of the two channel- QPSK format with SCM scheme is presented and discussed.