With the continuous increase of output power of double cladding fiber lasers, the researches of the techniques of fiber
laser beam combination have become a new focus. With the inherent characters of small volume, light weight, good
beam quality and system stability. Once the high power output laser was achieved, there would be broad applications in
industry, scientific researches and military field. Incoherent beam combination is much easier to be realized compared
with coherent beam combination, and with better system stability, thus it became an promising technique to achieve
small volume and high power laser source.
In an incoherent fiber laser beam combination system, the transform lens and diffractive grating play an important role in
determining the coupling efficiency. Through theoretic analysis and numerical simulations, it has been proved that the
optimum focal length of transform lens should be around 20cm in order to ensure a high system coupling efficiency
under some selected simulation parameters. Also the lower frequency of diffractive grating is preferred, and a
contradiction is present that is the higher frequency of diffractive grating is favorable in the consideration of maximum
fiber array width, thus a moderate value was chosen as 200mm<sup>-1</sup> with comprehensive consideration. The lower grating
thickness is helpful in improving the diffractive efficiency, while it faced the problem of heat resistance and
manufacturing difficulty, therefore the grating thickness between 2mm and 4mm is preferred. Under such optimized
parameters, the coupling efficiency would be 70% or even higher with small deviation angle and wavelength. An
example of effective jamming distance of combined fiber laser to visible light silicon CCD has been given, whose results
had proved the application foreground of combined fiber laser.
With the continuous increase of output power of double cladding fiber lasers, more effort is put into the researches of the technique of fiber laser beam combination, especially for incoherent laser beam combination because it is easier and with better system stability. Once high power output laser beam is achieved, there would be broad applications in industry, especially for manufacturing and material processing. The combination system's coupling efficiency plays an important role in determining the output power. Through theoretical analysis and numerical simulations, it has been proved that lower lateral off-set and higher grating period would be favorable, also an optimum spot radius exists which corresponds to a maximum value of coupling efficiency. Although lower focal length is helpful in improving the coupling efficiency, there is a contradiction that it makes a narrower fiber array width, which would limits the number of fiber lasers that could be utilized. Thus a moderate value of 20cm is chosen. Based on such optimized parameters, the beam quality M<sup>2</sup> is around 2, also a method of two parallel gratings is introduced, which ensures the M<sup>2</sup> factor to be around 1. Such combined fiber laser would be of great potential applications in manufacturing and material processing.
A novel multiple access model of satellite formation flying is brought forward, which has the advantages of shared signal
bandwidth, asynchronous access etc, at the same time it overcomes the problems of difficulty of constructing the
addressing codes in the optical code division multiple access and that of hardware implementing in wavelength division
multiple access. The model makes use of delay difference between two arms of Mach-Zender interferometer (MZI) to
encode and decode at the end of transmitter and receiver respectively, that's to say when the delay difference of
receiving end is close to that of transmitting end, the received optical power would be maximum. Frequency shift keying
modulation is adopted to achieve the coherent multiplexing multiple access. Then when the micro-satellite beam is
transmitted in atmosphere condition of weak turbulence, the receiving optical field is described by the Rytov model
based on the premise of independent optical field interference, the formula of SNR and BER is deduced. The simulation
results show that given the turbulence amplitude, 1/SNR ascends along with increasing of satellite number, furthermore
the larger turbulence amplitude, the more quickly 1/SNR rises, this proves number of satellites and turbulence amplitude
are the dominating parameters which affect the system performance.