Working knowledge of one or more areas: coherent detection architectures (IQ modulation/demodulation, balanced detection, optical hybrid operation), free-space optical design (ray tracing, tolerancing, stray light), or laser and fiber systems at the component level. Proficiency with optical instrumentation (OSAs, power meters, interferometers, collimated beams, wavefront sensors, beam profilers) and RF and microwave test equipment (network analyzers, spectrum analyzers, high-speed oscilloscopes).