In this paper,the experiment on an all-optical switching is reported based on a microstructure fiber(MF)-nonlinear optical loop mirror(NOLM). In the experiment, a 25-meter-long MF( Y = 36W -~ km -1 @ 1 550 nm) is used as a nonlinear medium of the nonlinear optical loop mirror and the input signal is generated by a 10 GHz tunable picosecond laser source,with a full-width at half-maximum ( F W H M ) of 2 ps and centered at 1 550 nm. With the increase of input power,a Tr nonlinear phase shift is obtained by a 40/60 coupler in the experiment, but the same result can not be found by a 48/52 coupler. Additionally, the switching devices can also be used as an all-optical regeneration. CLC number:TN253 Document rArticle 113:1673-1905(2006)03-0172-03Microstructure fiber (MF) has in recent years attracted much scientific and technical interest. MF has a range of unique optical characteristics [13], such as single mode guidance at all wavelengths, fibers with anomalous dispersion in the visible spectrum,and flat dispersion over broad bandwidths. One of the most interesting possibilities from a telecommunications perspective is the scope that MF technique allows for tailoring the mode area and thereby the nonlinear characteristics of a single mode fiber. The large index difference between silica and air allows the production of MF with a very high numerical aperture and thus a tightly confined mode E4-57 .All-optical switching devices are the key elements of future optical communication systems. And optical fiber Kerr switches are the most promising ones because of their subpicosecond response and low switching power due to extremely long interaction length. The nonlinear optical loop mirror (NOLM) has been one of the most successful devices for demonstrating a range of all optical processing functions E643 including all-optical switching, demultiplexing, wavelength conversion and optical logic.MF can have a much higher nonlinearity per unit length than conventional fibers, and consequently switching based on such fibers can be much shorter in length and/or operate at lower power levels than their conventional counterparts. In this paper, the experiment on alloptical switching based on a mierostrueture fiber is reported.The SEM micrograph of the microstructure fiber used
A novel technique is proposed for pulse compression by utilizing the nonlinear interaction between two neighboring pulses in optical fiber. By using the method of split-step Fourier (SSF), we numerically investigate the propagation of the pulse pair in optical fiber. Usually, two pulses attract each other and collide into one compression pulse periodically along the fiber. So with an appropriate choice of the fiber length -the collision length, such a fiber can act as compressor, so-called nonlinear action compressor. And then, the effects of parameters on the compression pulse have also been investigated numerically with SSF and we find the quality factor Q c >1.
In this paper, a novel structure design of all-fiber tunable compressor has been proposed which based on two cascaded uniform fiber Bragg gratings and a Piezoelectric Ceramic is used to make the compressor posses tunable function. By simulating numerically the evolution of picosecond pulses in the compressor, we have found that picosecond pulses can be compressed effectively, if the parameters of gratings and pulses were chosen properly. Additionally, the further study reveals that the width of output pulse could become narrower and the fiber gratings needed would be shorter, if the negative chirp of initial pulse were induced by pulse laser.
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