Multimode-Coupled High Frequency Photoreceiver

Current airborne military communications and electronic warfare systems require low SWaP, rugged fiber optics detectors for airborne military communications and electronic warfare systems. A typical 1 GHz-km graded index multi-mode (MM)50ĀĄmĀfiber supports 20 GHz communication bandwidth over 50 m fiber length and 50 GHz bandwidth over 20 m fiber length. In both cases, all optical modes of the multimode fiber might containĀenergy. A typical solution for high bandwidth applications uses butt-to-butt coupling from the fiber end to a small, 10 ĄmĀto 35 Ąm-sized receiver. This approach, however, does not work well as it results in spurious modulation of the signal at the photodetector output.Ā OneLight Sensing GRIN-Lens Optical Coupler (GLOC) system providesĀthe capability to efficiently couple signals from multimode fibers to small photoelectric detectors, supporting high bandwidth and stability of operation against modal distribution of energy in the fiber in wide temperature, vibrations and pressure rages.