  We present a simple and compact approach of structured illumination
microscopy by using three $2\times2$ fiber couplers and one $1\times4$ MEMS
optics switch. One uniform and three fringe illumination patterns were produced
by placing seven output fiber tips at the conjugate Fourier plane of the
illumination path. Stable and relatively high-speed illumination switching was
achieved by the optics switch. Super-resolution and optical sectioned
information was reconstructed from 4-frame data by using algorithms based on a
joint Richardson-Lucy deconvolution method and a Hilbert transform method. By
directly removing the out-focus components from the raw images provides better
imaging results.
