Measurement of the Parameters of Lensed Fibers for Application in Integrated Photonics

In this research for the purpose of radiation losses attenuating during the interfacing of an optical fiber with integrated optical circuits, methods for measurment the focal length and the diameter of the mode field of flat-chipped and lensed fibers are considered and proposed. A comparison is made between the IR camera method, the angular separation method and the transverse separation method in the near field to determine the mode field diameter. The behavior of a Gaussian beam coming out of a plane-cleaved fiber is theoretically analyzed, and a comparison is made with the radiation coming out of a lensed fiber. Experimental dependences of the power read by the receiver are obtained for longitudinal, transverse and angular separation of fibers. The focal length of the fiber lens is determined by the method of longitudinal alignment. The results obtained can be used in the design of various electron-optical and optoelectronic devices and the assembly of integrated optical circuits.