© The Institution of Engineering and Technology
A flat super-continuum (SC) generated by a 1.5 µm passively fibre modelocked laser incorporating a single-walled carbon-nanotube-based saturable absorber and a normal dispersion highly nonlinear photonic crystal fibre (PCF) is demonstrated. A compressed 620 fs pulse train from the modelocked laser is obtained and launched into the PCF. Since the pulses propagate in the normal dispersion regime of the PCF, linear frequency chirp is induced by self-phase modulation which leads to a flat SC. An SC covering 200 nm with less than 7 dB power fluctuation is achieved. The experimental results are consistent with the theoretical analysis based on the nonlinear Schrödinger equation.
References
-
-
1)
-
6. Agrawal, G.: ‘Nonlinear fibre optics’ (Academic Press, San Diego, CA, 2001).
-
2)
-
5. Chow, K.K., Takushima, Y., Lin, C., Shu, C., Bjarklev, A.: ‘Flat super-continuum generation based on normal dispersion nonlinear photonic crystal fibre’, Electron. Lett., 2006, 42, (17), pp. 989–990 (doi: 10.1049/el:20061722).
-
3)
-
4. Takushima, Y., Futami, F., Kikuchi, K.: ‘Generation of over 140-nm-wide super-continuum from a normal dispersion fibre using a mode-locked semiconductor laser source’, IEEE Photonics Technol. Lett., 1998, 10, (11), pp. 1560–1562 (doi: 10.1109/68.726749).
-
4)
-
2. Yamashita, S.: ‘A tutorial on nonlinear photonic applications of carbon nanotube and graphene’, J. Lightwave Technol., 2012, 30, (4), pp. 427–447 (doi: 10.1109/JLT.2011.2172574).
-
5)
-
1. Wang, G., Jiang, T., Li, C., Yang, H., Wang, A., Zhang, Z.: ‘Octave-spanning spectrum of femtosecond Yb:fibre ring laser at 528 MHz repetition rate in microstructured tellurite fibre’, Opt. Express, 2013, 21, (4), pp. 4703–4708 (doi: 10.1364/OE.21.004703).
-
6)
-
3. Corwin, K.L., Newbury, N.R., Dudley, J.M., Coen, S., Diddams, S.A., Weber, K., Windeler, R.S.: ‘Fundamental noise limitations to supercontinuum generation in microstructure fibre’, Phys. Rev. Lett., 2003, 90, (11), pp. 113904 (doi: 10.1103/PhysRevLett.90.113904).
http://iet.metastore.ingenta.com/content/journals/10.1049/el.2013.1371
Related content
content/journals/10.1049/el.2013.1371
pub_keyword,iet_inspecKeyword,pub_concept
6
6