Optical Polarization Diversity Receiver

An optical polarization diversity receiver assembly, comprising:

• a first optical collimator;
• a first non-polarizing beam splitter;
• a second non-polarizing beam splitter;
• a first linear polarizer;
• a second optical collimator;
• a second linear polarizer;
• a third optical collimator;
• a third linear polarizer;
• and
• a fourth optical collimator;
• wherein, during operations:
• with an input of an optical dual-beam interference signal launched into the first optical collimator, a collimated beam emerges and propagates in a free space,
• the collimated beam is divided into three beams with lowered power and directed along different paths upon encountering the first non-polarizing beam splitter followed by the second non-polarizing beam splitter, towards the first, second and third linear polarizers,
• permissible polarization transmission axes of the first linear polarizer, the second linear polarizer and the third linear polarizer are set apart from each other by a predetermined angle, with a respective transmitted beam manifesting interference across each corresponding axis,
• three separate beams generated from the first linear polarizer, the second linear polarizer and the third linear polarizer are coupled correspondingly into the second optical collimator, the third optical collimator and the fourth optical collimator,
• the second optical collimator, the third optical collimator and the fourth optical collimator send optical signals through optical fibers correspondingly to a first external photodetector, a second external photodetector and a third external photodetector located remotely, to convert optical signals into electrical signals with a maximum electrical signal among the electrical signals selected for analysis, and
• each of the three separate beams in the assembly maintains a same polarization state as that of the input when entering the respective linear polarizer by propagating through the free space or a polarization-independent media.