Modern communication networks rely on optical fiber networks to transmit various sensitive information among different organizations. With the evolution of fifth-generation telecom technologies, such as intelligent hyper-connected networks, the concentration of all transmission information on optical communication networks has become prevalent. Consequently, ensuring the security of optical transmission devices has become paramount. Establishing secure communication between optical access network nodes presents a significant challenge due to reported instances of hacking into optical cables, rendering the optical communication medium vulnerable to eavesdropping. Therefore, there is a pressing need for complementary security measures. This paper proposes a lightweight yet effective secure key distribution strategy to enhance the network security of optical communication. The proposed Key Exchange (KE) protocols, focusing on symmetric key sharing (SKS) and Secure Key Update (SKU), are subjected to Scyther-based security simulations to demonstrate their security. Additionally, an informal security analysis is provided to showcase the resilience of the SKS and SKU algorithms against various security attacks. Computational benchmarks show that both algorithms require fewer computational, communication, and storage resources during the key generation phase compared to related authentication protocols.