Low-Noise WideBand Heterodyne Optical Array Receiver
Patent application, filed 10 Oct 2000
DEPARTMENT OF THE NAVY WASHINGTON DC
Pagination or Media Count:
A system and method is disclosed for detecting optical signals that is especially suitable for use with a fiber optic sonar transducer array. The system preferably uses two photodiodes with a frequency response matched to within one percent over a bandwidth of at least one Gigahertz to reduce common mode intensity noise. Preferably the two photodiodes are manufactured on the same semiconductor wafer to provide as closely identical properties as possible. In one preferred embodiment, two low-noise miniature microwave integrated circuits are used to amplify the detected signal. A biasing network biases and couples the miniature integrated circuits together.
- Fiber Optics and Integrated Optics