Volume 4 • Issue 4 • 1000e122 J Biosens Bioelectron ISSN: 2155-6210 JBSBE, an open access journal Editorial Open Access Tamee et al., J Biosens Bioelectron 2013, 4:4 DOI: 10.4172/2155-6210.1000e122 *Corresponding author: Yupapin PP, Advanced Studies Center, Department of Physics, Faculty of Science, King Mongkut’s Institute of Technology Ladkrabang, Bangkok (KMITL), Thailand, 3South East Asian Theoretical Physics Association (SEATPA), Singapore, E-mail: kypreech@kmitl.ac.th Received July 20, 2013; Accepted July 21, 2013; Published July 22, 2013 Citation: Tamee K, Visessamit J, Yupapin PP (2013) Multicolor Solitons for Biosensors. J Biosens Bioelectron 4: e122. doi:10.4172/2155-6210.1000e122 Copyright: © 2013 Tamee K, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Multicolor Solitons for Biosensors Tamee K 1 , Visessamit J 2 and Yupapin PP 2,3 * 1 Department of Computer Science and Information Technology, Faculty of Science, Naresuan University, Pitsanulok 65000, Thailand 2 Advanced Studies Center, Department of Physics, Faculty of Science, King Mongkut’s Institute of Technology Ladkrabang, Bangkok (KMITL), Thailand 3 South East Asian Theoretical Physics Association (SEATPA), Singapore Optical soliton has been recognized as a good candidate for long distance optical communication and long lasting propagation in optical waveguide, where the dominant properties are high output intensity, low loss and small dispersion value within the propagation media, the concept of repeater less is also the another good advantage. However, the narrow band condition that gives soliton application limitation is the pumping device wavelength, where the pumping material used is the specifc material known as an erbium doped waveguide (fber), in which the pumping energy at the center wavelength is 1.55 micrometer. Terefore searching for multi-wavelength solitons with new pumping technique has been the challenge. Till date, many researchers have investigated and reported the possibility of multi-wavelength soliton generation, where most of them proposed the soliton generations in many aspects [1-5], in which the color solitons [6-8], however, the previous problems remain in practical applications. Recently, Yupapin et al have reported the use of an interesting system and results that can be used to form multicolor solitons, where the color solitons are now easily generated and controlled by using the Gaussian input pulse (common laser pulse) propagating within typical modifed add-drop flter [9-11], in which two nonlinear devices are used incorporating the center ring known as a PANDA ring circuit. In operation, light from a common laser source with wide range of center wavelength is input into the system as shown in (Figure 1). Te nonlinear behavior of light propagation within the system is occurred by the coupling efects from the two nonlinear side rings, in which the four-wave mixing of light can be introduced within the system due to the superposition of the chaotic signals, which is generated by the two nonlinear side rings. Finally, the resonant situation of some wavelengths can be introduced and pumped the propagation modes and seen at the system output port, where in this case the multi-wavelength output signals are obtained, in which the two soliton properties (i) self-phase and (ii) cross phase modulation without dispersion remain. To change the multi- wavelength or color soliton bands, the use of the control port is required by input the moderated signal via the add port, in which multicolor solitons can be generated and controlled for various applications. In simulation, a common laser (i.e. laser pointer) is exploited as a laser source. Te optical power is the same as a common laser peak power, which is normally at 3.0 mW, however, the normalized output power is required and plotted. By using the system in (Figure 1), the simulation results are obtained by using the practical parameters, the MATLAB program is used to obtain the results. Te common laser pulse can be changed to be a soliton pulse by the resonant pumping power via the two side rings, which is occurred and seen via the add-drop flter output (E th ). In this simulation, the center ring radius of 20 µm is supposed to be the input main ring circuit as shown in (Figure 1), the two nonlinear side ring radii are 5 µm. Te center ring and nonlinear materials are SiO 2 and In GaAsP/InP respectively. Te waveguide attenuation coefcients (α) is 0.2 dB/mm [12]. Te output transfer function is obtained by using the signal fow graph method [13]. Te resonant number of the main ring and side rings (N: NR: NL) are chosen as 9:6:6. Te outer coupling factors κ 1 and κ 2 of PANDA ring resonator are fxed as 0.65 and the inner coupling factors (κ R and κ L ) are set as 0.35. A round-trip time of the PANDA circuit at the Edr Edr Ein Ein Eth Eth E ad E ad Figure 1: Color soliton generation system, where E in :input port feld; E dr : drop port feld; E ad : add port feld; E th : through port feld, where more add-drop flters can be included for long distance use. Through Port Power from PANDA Ring Resonator Through Port Power from ADD/DROP #1 Through Port Power from ADD/DROP #2 Through Port Power from ADD/DROP #3 Distance (meter) Distance (meter) Distance (meter) Through port (a.u) Through port (a.u) Through port (a.u) Through port (a.u) Distance (meter) 1 2 3 4 5 6 7 8 9 10 11 11.4 11.6 11.8 12 12.2 12.4 12.6 12.8 13 13.2 13.4 13.6 13.8 14 14.2 14.4 14.6 14.8 15 15.2 15.4 15.6 15.8 16 16.2 16.4 16.6 16.8 1 0.5 0 1 0.5 0 1 0.5 0 1 0.5 0 Figure 2: Results of color soliton propagation in the system with wavelength center at 0.5775 micrometer, where the normalized power has slightly changed from 0.8 to 0.5 with distance of 16.6 meter. Journal of Biosensors & Bioelectronics J o u r n a l o f B i o s e n s s o r & B i o e l e c t r o n i c s ISSN: 2155-6210