TECHNOLOGIES & PRODUCTS
Transmission subsystems: Transceivers and transponders are subsystems that contain both an optical transmitter and an optical receiver, and typically terminate a single optical channel. These subsystems have a standard electrical interface that is connected to higher-level functional blocks such as framers. In the case of a transponder subsystem it also contains further electronics such as electrical multiplexing and demultiplexing. No optical transmission is possible without transceivers/transponders.

DPG has years of experience and knowledge of optical transmission, both in high-speed digital transmission as well as in broadband analog transmission. Additionally, the consortium has broad knowledge of signal processing and modulation techniques applied to optical transmission systems. All of these aspects have been included in products developed by the consortium. For example, one of these products has the longest reach at rates of 10 Gb/s and above.

RF/Microwave photonics: There has been a push in the industry (specifically the defense industry) to be able to transmit broadband analog signals over optical fiber, avoiding large and heavy RF cables. This can be achieved by analog modulation of an optical carrier, which is than transported over optical fiber. Producing the transmitters and receivers requires a deep understanding of analog modulation techniques, analog RF design and the impact of impairments in the fiber, the transmitter and the receiver. For example, the transmitter linearity and its second and third harmonic distortion are key issues in the design of these systems.

DPG has years of experience designing, producing and selling these RF photonics subsystems to the defense industry. Products such as a fiber based GPS system has been widely deployed by the US Navy.

System integration: DPG’s team has many years of experience in communication system design and architecture. For example, the design, production, deployment and maintenance of a number of state-of-the-art undersea systems with best in class performance. These systems integrated many of the subsystems and components mentioned earlier, as well as network management software.