Fiber optic polarizers, fiber optic isolators, fiber optic couplers; fiber optic filters; fiber optic light emitting diodes; fiber optic controllers; fiber optic laser diodes; optical power meters; fiber optic receivers; fiber optic transmitters; fiber optic transceivers; and fiber optic sensors, namely, pressure sensors and temperature sensors that measure the changes in the characteristics of light travelling inside the fiber to derive the change of pressure or temperature in the subject un...