The theory of inspects inter-quality of fruit using spectroscopy and imaging is light migration in fruit tissue.

In the optical soliton transmission systems using common single module optical fibers, the amplified spontaneous emission (ASE) noise and the overflow of dispersion waves are the two main factors that can cause energy and timing jitter of soliton, thus leading to some errors in bit rate of system.

【Abstract】 This paper intends to give a brief introduction of the main characters and key techniques of optical soliton transmission systems, and then proposes a practical design of this system.

The mode field radii in the near field and the angular radii of the far field divergence defined by second moment and differential operator algorithm; and the beam propagation factor defined by second moment algorithm were presented to describe the characteristic beam parameters in the diffracted field of the fiber end face comprehensively.

It is shown that under proper conditions,the beam propagation factors can be smaller than 1.

The mode field half width,far field divergence half angle and beam propagation factor are the criterion of parameter descriptions and quality evaluations for the beam.