Requirements for increasingly complex, scalable, and dynamic networks, which provide assured end-to-end connectivity in a wide range of scenarios, have been emerging. In this paper, the authors have been investigating optical networks that provide extremely high data rates makes it a very attractive medium for multiservice transmission in building networks at low cost. Recently, there has been active research going on congestion control in optical networks to provide the communication reliability and bandwidth efficiency. They investigate the mutual diversity technique as a candidate solution for congestion control over optical network. This paper proposes a new robust Medium Access Control (MAC) protocol, called Mutual Diversity MAC (MD-MAC), which exploits the mutual communication capability at the PHYsical (PHY) layer to improve robustness in optical networks.