Abstract: An optical system, including one or more coherent light, an optical arrangement, and a detection unit, and respective method are described. The optical arrangement includes optical elements forming at least first and second interferometer loops, each including a reference arm and an interrogating arm and are associated with at least first and second detectors of the detection unit. Light propagating in the interrogating arm is directed at a target object via an output optical element and a reflection of light from said target object is collected by an input optical element. The detection unit is configured to determine data indicative of a relation between signals detected by the at least first and second detectors. One of the first and second interferometer loops includes a first noise generator positioned to affect light propagating in both of the corresponding reference and interrogating arms, thereby affecting coherence of light in the interferometer loops.

Abstract: Provided is a system for range detection including at least one beam source arrangement configured to provide illumination of certain coherence length, an optical arrangement, and a detection arrangement including at least one detector unit.