Suppression of Four Wave Mixing Based on the Pairing Combinations of Differently Linear-Polarized Optical Signals in WDM System

Subject Areas : Journal of Optoelectronical Nanostructures

Fatemeh Dehghani ¹ (Optoelectronic Research Center, Electronic Department of Shiraz University of Technology.)
Farzin Emami ² (Optoelectronic Research Center, Electronic Department of Shiraz University of Technology)

Received: 2015-06-15 Accepted : 2015-12-29 Published : 2016-03-01

Keywords: four wave mixing, linear polarization, wavelength-division-multiplexing, dispersion,

Abstract :

Data transmission in optical systems and increased transmission distance capacity benefit by using optical amplification wavelength division multiplexing (WDM) technology. The combination of four waves (FWM) is a non-linear effect in the wavelength division multiplex (WDM), when more than two wavelengths of light in a fiber launch will occur. FWM amount depends on the channel, the channel spacing and dispersion fiber, but is independent of the bit rate. A simple equation for the spectral line width is shown. Dispersion causes distortion of the transmitted signals and needs to be compensated to achieve a long-haul system. The four-wave mixing effect have been studied as one of the factors influencing by using OPTISYSTEM Software. In this paper, a new approach for suppressing the four-wave mixing (FWM) crosstalk by using the pairing combinations of differently linear-polarized optical signals is investigated. The simulation is conducted using an eight-channel system. The proposed technique is to suppress the FWM interaction using different input powers. It has been evaluated for single-mode fiber (SMF). FWM can be strongly reduced, when the polarization technique is conducted for SMF. We also compare our new method with a conventional method to demonstrate the effect of FWM as well. The comparison was conducted at an input power range of 2 dBm. Decreasing the input power can decrease the FWM effects. In the absence of the polarization technique the FWM power was –64 dBm at an input power of 2 dBm. The FWM power decreased to less than -82 dBm at a 2 dBm input power. The system performance greatly has been improved.

References:

[1]     G. P. Agrawal, Fiber-Optic Communication Systems, 3^rded, Wiley, New York, 2002.

[2]     G. P. Agrawal, Nonlinear Fiber Optics, 3^rded,San Diego, Academic Press, 2001.

[3]     K.Inoue,Arrangement of orthogonal polarized signals for suppressing fiber four-wave mixing in optical multichannel transmission systems, IEEE Photon. Technol. Lett., 3 (1991)560-563.

[4]     J. Onishi, Sh. Kojimava andT. Numai,Effects of frequency/polarization allocations and the zero-dispersion frequency on FDM light wave transmission systems, Opt. Commun.,  281 (2008) 3882–3891.

[5]     K. Inoue, Polarization effect on four-wave mixing efficiency in single-mode fiber, IEEE J. Quant. Electron., 28 (1992) 883 – 894.

[6]     G. Charlet, E. Corbel. J. Lazaro, A. Klekamp, W. Idler, R. Dischler, S. Bigo, Comparison of system performance at 50, 62.5 and 100 GHz channel spacing over 80 transoceanic distances at 40 Gbit/s channel rate using RZ-DPSK, Elec. Lett.,  41 (3) (2005) 145 - 146.

[7]     K. O. Hill, D. C. Johnson, B. S. Kawasaki, and R. I. MacDonald, CW three-wave mixing in single-mode optical fibers, J. Appl. Phys., 49 (1978) 5098-5106.