Acta Photonica Sinica, Volume. 45, Issue 2, 206003(2016)
Ultrashort Optical Pulse Shaping Based on Phaseshifted Fiber Gratings Differentiators
Based on the transfer matrix method and the couplemode theory, the characteristics of reflective spectrum and phase shift of the phaseshifted fiber Bragg gratings were analyzed. The result showed that the transmission windows in the reflection spectrum increased and the phase jumped frequently with the increasing of the phase points, thus the differential effects on signals were generated. Besides, the phase differential orders were proportional to phaseshift points. On this basis, a pulse shaper was designed based on the characteristics of the differential phase shift grating. By optimizing the weighting factors for each order derivative of the Gaussian input pulse, the output pulse can be formed the shapes of rectangular and triangular. By changing the length ratio of the first section optical fiber grating and the second section, the distorting phenomenon of the triangular output pulse was improved. Finally, changing the Gaussian input pulse width by ±5%,the output waveform were synthesized as rectangular pulse and triangular pulse. Thus the stability and practicality of the pulse shaping system were verified.
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DONG Xiaowei, GUO Pan, LIU Wenkai. Ultrashort Optical Pulse Shaping Based on Phaseshifted Fiber Gratings Differentiators[J]. Acta Photonica Sinica, 2016, 45(2): 206003
Received: Aug. 16, 2015
Accepted: --
Published Online: Apr. 1, 2016
The Author Email: Xiaowei DONG (way7803@163.com)