A dynamic bandwidth allocation protocol in WDM-PON with loop-back scheme

In this paper, we propose a dynamic bandwidth allocation in wavelength division multiplexing based passive optical network (WDM-PON) with loop-back scheme. A loop-back approach is to replace the transmitter in the ONTs with a reflective modulator, which uses part of the downstream light as the source for the upstream. We can utilize this scheme to share the cost of components in a PON. We present dynamic bandwidth allocation algorithm to maximize network efficiency.