The phase difference caused by piston error translated with the tiled-grating compressor, the focal spot was affected by both non-integral number of gratingspace and out-of-plane piston error.
The basic principles of multi-parameter tunable optical fiber grating wavelength tuner based on stress, displacement, space angle are analyzed and relative experimental researches are performed.
The theory of using time to measuring space has broke through the concept of the traditional grating type measuring in time grating sensor and has advantage in many aspects.