Open and Disaggregated Optical Networks refer to communication systems in which network components—such as transponders, amplifiers, and control software—are decoupled and interoperable across multiple vendors. This design promotes flexibility, cost efficiency, and innovation by avoiding proprietary constraints. It aligns with the broader movement toward open networking and software-defined control. NEC Laboratories America conducts research in this field to enhance scalability and automation in optical systems. Open disaggregation represents a shift toward transparent, modular network architectures.