SBIR-STTR Award

Physical Sciences Inc. (PSI) proposes to develop an optical integrated circuit that will allow optical thresholding and clock recovery from received signals in space communications systems. The system will be based on optical frequency mixers in lithium niobate that are compatible with any modulation format and data rates beyond 100 Gb/s. PSI has extensive experience implementing optical signal processing functions using the mature lithium niobate material system, which has been proven in satellite applications. The optical frequency mixers will be integrated with electronic and optical fiber components to create a unique receiver architecture suitable for the demanding space communications environment. During the Phase I program, an integrated device including directional couplers for beam combining, harmonic generators for optical threshold detection, and frequency mixing for clock recovery will be designed. A complete receiver including a local oscillator laser for the clock recovery function will also be designed using this novel optical integrated circuit. A prototype device will be fabricated in Phase II, where all components will be integrated into a compact package suitable for space qualification.

Benefit:
The proposed research and development will result in device technology that is directly applicable to commercial optical communications systems. The material and device structures will enable all-optical signal processing functions that will enable low-power, compact transceivers compatible with secure protocols and increased data rates.

Keywords:
All-Optical Signal Processing, Nonlinear Optics, Clock Recovery, Space Communications, Coherent Optical Communications

Physical Sciences Inc. (PSI) has designed an integrated optical receiver circuit capable of performing optical thresholding and clock recovery from received signals in space communications systems. During the proposed Phase II program, PSI in collaboration with the Bell Labs group of LGS Innovations will fabricate and deliver a prototype optical receiver system to the Air Force. The PSI design uses novel optical frequency mixers in lithium niobate that are compatible with any modulation format and data rates beyond 100 Gb/s. PSI has extensive experience implementing optical signal processing functions using the mature lithium niobate material system, which has been proven in satellite applications. The Bell Labs group is a world leader in the hybrid integration of optoelectronic components and will fabricate a prototype optical receiver compatible with 10 Gb/s data rates and power levels expected in transmission between low-earth orbit satellites. The prototype will combine the optical frequency mixer with a laser, detectors, and electronics on a single substrate to prove the system concept. The device will be tested at PSI and delivered to the Air Force for further system testing.

Benefit:
This proposed project will support the development of a novel integrated optical receiver platform intended for initial use in satellite-borne high-speed communications systems. The compact size, low weight, and low power consumption of the design are key virtues that will simplify deployment of space-based communications systems. The technology will be directly applicable to military space communications systems that currently in planning stages. It will also enable cost-effective commercial space-based communications links that are envisioned as a future supplement to terrestrial long-haul fiber optic communication links.

Keywords:
All-Optical Signal Processing, Nonlinear Optics, Clock Recovery, Space Communications, Coherent Optical Communications