All-optical code-division-multiplexing technique supporting multirate data communications and local-area-network interconnections.
An efficient all-optical code-division-multiplexing (AOCDM) technique is proposed to support multirate data communications and local-area-network (LAN) interconnections with multiple protocols. To achieve this goal, we use a strict optical orthogonal code (OOC) in multirate AOCDM systems to guarantee that both cross- and autocorrelation constraints are minimum (i.e., 1) for incoherent optical processing. In contrast, the use of a conventional OOC may result in correlation constraints of 2, which in turn can degrade system performance. Moreover, implementation issues on AOCDM systems are discussed. These include the design of low-cost optical transmitters and the trade-off among coherence time, spectral width, and pulse width for AOCDM systems. It is shown that multirate AOCDM systems have a high operation flexibility to support data communications and LAN interconnections of both equal and multiple bit rates. For multirate data transmissions, the proposed system can have a better bandwidth efficiency and a lower bit error rate than a system that uses a conventional OOC.
Zhang
Jian-Guo
JG
Telecommunications Research Group, School of Electrical, Electronic and Information Engineering, South Bank University, 103 Borough Road, London SE1 0AA, United Kingdom. zhangja@sbu.ac.uk
Sharma
Awnashilal B
AB
Kwong
Wing C
WC