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 Qc>1.
In future high bit-rate DWDM systems, the channel separations will be narrower and the bit-rate of single channel will be higher. The dispersion in transmission of fiber Bragg grating is a factor that cannot be neglected. We emphasize the effects of the 3rd order dispersion because the 3rd order dispersion is more detrimental for short pulses than the 2" order dispersion. Furthermore, the 3rd order dispersion is always positive whether the wavelength of the adjacent channel is longer than Bragg wavelength or not. So the accumulated effects are more notable than the 2nd order dispersion, which can be positive or negative. We calculated the effects of the dispersion of FBG on pulses with ips, 2ps and 5ps pulse widths under channel separations of 5O GHz and 100 GHz. It is shown the 3rd order dispersion will be more detrimental in high bit-rate DWDM systems. This paper will give some guide to FBG design for ADM application. The method we use is split-step Fourier method.
A new scheme is put forward for generation of the compressed pulse pair using fiber grating. This new compressor bases on the soliton-effect and makes use of high-order soliton supported by the fiber grating. In the anomalous GVD regime outside the photonic band gap ( ? < ? B), the third-order soliton may be formed when pulse pass through the fiber grating. As we know, the third-order soliton will split into two distinct pulses at z0/2(zois the soliton period), but the two pulses recover the original shape at the end of the soliton period. If we break the balance between the GVD and the nonlinearity at z0/2, the split two pulses will be self-existent permanently but not recover. We present the basic idea and introduce this new kind of compressor in this paper. Finally, we have proved this method by numerical simulation with SSF (Slip-Step Fourier) method.
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