Title :
Near field measurement of fiber mode field diameters: effects of defocusing
Author_Institution :
Nat. Phys. Lab., Teddington, UK
fDate :
4/1/1995 12:00:00 AM
Abstract :
An instrument has been built to measure the mode field profile of optical waveguides by the near field method. It incorporates a confocal microscope that allows accurate focusing of the waveguide end. The instrument has been used to measure the effect of defocus on measured fiber mode field diameters (MFD´s). The amount of defocus must be less than a few micrometers if errors in the measured MFD are to be kept less than 0.1 μm. Other focusing criteria can give errors of 2% or more
Keywords :
diameter measurement; focusing; optical fibre testing; optical microscopy; confocal microscope; defocusing; effects; fiber mode field diameter; focusing criteria; mode field profile; near field measurement; near field method; optical waveguides; Diode lasers; Focusing; Instruments; Microscopy; Optical fiber couplers; Optical fiber testing; Optical fibers; Optical interferometry; Optical sensors; Optical waveguides;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
