HIGH TRANSMITTED BIT RATE THROUGH GRADED INDEX POLYMER OPTICAL FIBERS: THE WORST CASE (FOUR TIMES FORMULA)

Saad, Abd-El-Fattah A.

doi:10.21608/mjeer.2006.64759

HIGH TRANSMITTED BIT RATE THROUGH GRADED INDEX POLYMER OPTICAL FIBERS: THE WORST CASE (FOUR TIMES FORMULA)

Document Type : Original Article

Author

Abd-El-Fattah A. Saad

Dept. of Electronic and Electrical Communication Eng., Faculty of Electronic Engineering, Menoufya University, EGYPT

10.21608/mjeer.2006.64759

Abstract

In the present paper, polymer optical fibers of wide bandwidth in high speed optical communication systems are deeply studied over wide ranges of the affecting parameters. The phenomenon of Four-Wave Mixing is reduced via the increase of channel spacing. Two multiplexing methods are applied, ultra–wide space division multiplexing (UW–SDM) and ultra–wide wavelength division multiplexing (UW–WDM), where 4000 channels are processed to handle the product of bit rate and repeater spacing for cables of multi-links (50-200 links/core). Two transmission techniques are investigated; namely soliton and maximum time division multiplexing (MTDM). The product per channel is treated over wide ranges of the affecting parameters. The worst real case of power budget and the total time spreading (Four Times Formula FTF) due to the effect of transmitter, optical link, and receiver are deeply investigated over wide ranges of affecting parameters. Dispersion is deeply studied to handle average worst bit rate over the wavelength range (1.45 μm-1.65 μm). This is done through two bandwidths, the worst bandwidth and the normal one.
The processing of the worst case clarifies the impact of both the modal dispersion as well as the chromatic dispersion besides the pulse rise time and the receiver rise time. In general, the worst bandwidth BW_w (real case) is less than the ordinary bandwidth (ideal case) BW_c and consequently the worst transmitted bit rate (real case) is less than the ordinary bit rate (ideal case). Both the processed bandwidths {BW_w, and BW_c} decrease as relative refractive index difference (Dn) increases, the operating wavelength increases, and number of links decreases.

References

[1] Xingsheng Xu, “Stimulated Raman Spectrum Threshold in Poly(methyl methacrylate) Optical Fibers”, Optics, Communications, Vol.19, 89-93, 2001.

[2] Farag Z. El-Halafawy, A. A. Mohammed, A. A. Saad, and A. N. Rashid, “Polymer Optical Fibers in High Speed Optical Telecommunications Systems”, Proc. 4^th ICEENG Conf., 23-25 Nov., AC2 (1-12)(20-31), Egypt, Nov. 2004.

[3] T. Ishigure, M. Kano, and Y. Koike, “Which is a More Serious Factor to the Bandwidth of GI POF: Differential Mode Attenuation or Mode Coupling?”, J. Lightwave Technol., Vol.18, No.7, pp. 959-965, July 2000.

[4] Pak L. Chu, “Polymeric Optical Fiber Challenge”, City Univ. of Hong Kong, July 2004.

[5] T. Ishigure, Y. Koike, and J. W. Fleming, “Optimum Index profile of the Perfluorinated Polymer-Based Polymer Optical Fiber and Its Dispersion Properties”, J. Lightwave Technol., Vol. 18, No.2, pp. 178-184, February 2000.

[6] M. Sato, T. Ishigure, and Y. Koike, “Thermally Stable High-Bandwidth Graded-Index Polymer Optical Fiber”, J. Lightwave Technol., Vol. 18, No.7, pp. 952-958, July 2000.

[7] T. Ishigure, E., Nihei, and Y. Koike, “Optimum Refractive-Index Profile of the Graded-Index Polymer Optical Fiber, Toward Gigabit data links”, Applied Optics, Vol. 35, No.12, pp. 2048-2053, 20 April 1996.

[8] D. G Cunninghram, Del C. Hanson, and Loonard Kaszavsky “The IEEE 802.3z Worst Case Link Model for Optical Physical Media Depedendent Specification Devices”, Based on: ANSI T1.646-.1995, Broadband ISDN Physical Layer Specifications for User-Networks interface.

[9] G. D. Brown, ”Bandwidth and Rise Time Calculations for Digital Multimode Fiber-Optic Data Links”, J. Lightwave Technol , Vol. 10, No.5, pp.672-678, 92.

[10] J. L. Gimlett and N. K. Cheung, ”Dispersion Penalty Analysis for LED Single Mode Fiber Transmission Systems”, J. Lightwave Technol., Vol. LT-4, No. 9, pp. 1381-1392, Sept. 1986

[11] J. Zubia and J. Arrae, "Plastic Optical Fibers: An Introduction to Their Technological Processes and Applications", Optical Fiber Technology, Vol. 7, pp. 101-140, 2001.

[12] T. Ishigure, M. Sato, A. Kondo, and Y. Koike, “High-Bandwidth Graded-Index Polymer Optical Fiber with High-Tempeature Stability”, J. Lightwave Technol., Vol. 20, No. 8, pp. 1443-1448, Aug. 2002.

[13] K. H Kim, H. K. Lee and El-Hang Lee, "Calculation of Dispersion and Nonlinear Effect Limited Maximum TDM and FDM Bit Rate of Transfer Limited Pulses in Single Mode Optical Fibers", J. Lightwave Technol., Vol. 13, No. 8, pp. 1597-1606, Aug. 1995.

[14] E. Disurvire, "Erbium-Doped Fiber Amplifiers: Principle and Applications”, J. W & Sons, Inc., NY, U.S.A., 1994.

[15] A. R Charplyoy, "Limitatins on Lightwave Communicions Impopsed by Optical Fiber Nonlinearities", J. Lightwave Technology, Vol. 8, No. 10, pp. 1548-1556, Oct. 1990.

[16] A. R Charplyoy, "Impact of Nonlinearities on Lightwave Systems", Optics and Photonics News, pp. 16-22, May. 1994.