Title :
Effect of a nonlinear photonic Crystal fiber on the noise characterization of a distributed Raman amplifier
Author :
Zhao, Chun-liu ; Li, Zhaohui ; Yang, Xiufeng ; Lu, Chao ; Jin, Wei ; Demokan, M.S.
Author_Institution :
Lightwave Dept., Inst. for Infocomm Res., Singapore, Singapore
fDate :
3/1/2005 12:00:00 AM
Abstract :
The first experimental study of the effect of a nonlinear photonic crystal fiber (PCF) on the noise characteristics of a distributed backward-pumped Raman amplifier is reported. The PCF has a highly nonlinear Raman efficient, and a high Rayleigh scattering parameter. When an optical signal first passes through a 100-m nonlinear PCF followed by a 25-km single-mode fiber, the optical signal-to-noise ratios (OSNRs) of the amplified spontaneous emission and the double Rayleigh scattering (DRS) are improved because the high Raman gain efficiency of the PCF makes the Raman gain of the signal at the beginning of the link increase, and the signal power over the length of the transmission becomes near a constant. However, the improvement of the OSNR of DRS compared with the OSNR of amplifier spontaneous emission is limited by the large Rayleigh scattering in the PCF.
Keywords :
Raman lasers; Rayleigh scattering; laser noise; nonlinear optics; optical fibre amplifiers; optical pumping; photonic crystals; superradiance; 100 m; 25 km; Raman gain; Rayleigh scattering parameter; amplified spontaneous emission; backward-pumped Raman amplifier; distributed Raman amplifier; double Rayleigh scattering; noise characteristics; noise characterization; nonlinear Raman coefficient; nonlinear photonic crystal fiber; optical signal; optical signal-to-noise ratios; single-mode fiber; Distributed amplifiers; Fiber nonlinear optics; Optical fiber amplifiers; Optical noise; Optical scattering; Photonic crystal fibers; Raman scattering; Rayleigh scattering; Signal to noise ratio; Stimulated emission; Amplified spontaneous emission (ASE); Raman amplifier; double Rayleigh scattering (DRS); photonic crystal fiber (PCF);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2004.841023
