A non-intrusive in situ method of optical beam profiling in LCOS-based optical fiber switches

This paper proposed a non-intrusive method of measuring the optical beam profile at the surface of the liquid crystal on silicon (LCOS) device in an optical fiber switch. This method is based on blazed grating and can be employed in situ (on-line) for two-dimensional beam profiling in the LCOS-based optical fiber switches without introducing additional components or rearranging the system. The measured beam radius was in excellent agreement with that measured by the knife-edge technique.

► In situ non-invasive beam profiling for LCOS based optical fiber switches. ► Capable of full 2D spatial profiling with high accuracy. ► No additional components or space are required. ► No mechanical adjustment and real-time monitoring possible.