We consider the pulse propagation in a photonic crystal fiber (PCF), whose central core is filled with chloroform, wherein the pulse propagation is governed by the dispersion and nonlinearity varying nonlinear Schrödinger (NLS) equation. By using appropriate self-similar scaling analysis, we delineate the generation of linearly chirped soliton like pulse in PCF. The analytical results demand that the effective dispersion must decrease while the nonlinearity must increase exponentially in the PCF. Thus, based on the analytical results, we propose the new designing of PCF to achieve the chirp and pedestal free ultrashort pulses at 850 nm though the pulse compression technique. To clearly explain the different stages of pulse compression process in the newly designed PCF structure, we adopt the projection operator method to derive the pulse parameter equations which indeed very clearly describe the self-similar pulse compression process at different parts of the PCF structures. In addition, we also compare the pulse parameters of chloroform filled PCF with that of standard silica PCF using projection operator method. The analytical results exactly match with the results obtained by the projection operator method. Further, we also adopt the split-step Fourier algorithm to investigate the pulse compression process in PCF and we find that the results obtained from direct numerical experiments also exactly match with those of analytical and semi-analytical results. The main advantages of the proposed chloroform filled PCF pulse compressor based on self-similar analysis are that the compression factor can be enhanced enormously and the resulting the compressed pulse is almost free from chirp and pedestal. Also, this newly proposed chloroform filled PCF exhibits low dispersion length for efficient pulse compression with low input pulse energy and low loss over small distances.
|Publication status||Published - 2010|
|Event||Progress In Electromagnetics Research Symposium - Cambridge, United States|
Duration: 5 Jul 2010 → 8 Jul 2010
|Conference||Progress In Electromagnetics Research Symposium|
|Period||5/07/10 → 8/07/10|
Senthilnathan, K., Vasantha Jayakantha Raja, R., Porsezian, K., Olupitan, S., & Nakkeeran, K. (2010). Generation of ultrashort pulses at 850nm in a newly designed photonic crystal fiber. Poster session presented at Progress In Electromagnetics Research Symposium, Cambridge, United States.