The COSETI Observatory
Continuous Wave, Monochromatic Laser Beacon Signals.
- Incoherent Direct Detection Systems.
- Use a monochromator or bandpass optical filter to reduce effect of background noise.
- Coherent Optical Heterodyne Detection Systems.
- Also reduces effect of background noise.
- Only recommended for Professional OSETI systems because of difficulty in its implementation, tunability and its expense.