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Demonstration of Optical Orthogonal Frequency Division Multiplexing

Ali Setoodehnia 1, Feng Huang 1, Hong Li 2, Kamal Shahrabi 1

1. Kean University, Union, NJ 2. College of Technology, CUNY, Brooklyn, NY email: asetoode@kean.edu

Abstract: This paper demonstrates a new transmitting technique based on a simultaneous multiple channel modulation of ultrafast optical pulse by sending the Fourier Transform (FT) of the time framed signals over a communication channel. This transmission format was designed and found to overcome certain types of channel impairments. The main advantage is that the noise and signal degradation from one particular channel or several channels can be distributed over the entire span of the available frequency resource, so that the particular channels’ SNR can be improved regardless of noise source. The trade off is that the other channels’ SNR will be affected moderately. This method will be useful for the unknown channel noise pattern, for channel with irregular attenuation mode, and for the channel where the SNR changed dramatically over the entire available span.

Introduction: The successful development of optical communication followed the availability of high quality tunable semiconductor lasers. Such lasers provide a narrow linewidth source with high signal to noise ratio (SNR). The dense wavelength division multiplexed (DWDM) transmission format is a logical solution inherited from FM radio and broadband wireless communication for transmitting more information simultaneously through the communication channel. However, amplitude modulation and detection are still used in the current optical network, which limited the available communication protocols. Commercial network designers have noticed the advantages of frequency or phase modulation scheme to improve the SNR further. However the inherent random noise from different lasers introduces additional noise sources. As an attractive alternative to existing optical communication source components (semiconductor diode lasers), femtosecond pulse shaping provides multi channel outputs from one single mode locked femtosecond laser 1-3 that is coherent and receiving renewing interest in study the information transmission aspect of such source. Further more, the phase of the individual channel can be controlled independently, enabling the applicability of various advanced network architectures.

An application of femtosecond pulse shaping can be frequency division multiplexing (FDM). FDM is a technology that transmits multiple signals simultaneously over a single transmission path, such as a cable or wireless system. Each signal travels within its own unique frequency range (carrier), which is modulated by the data (text, voice, video and etc.). Orthogonal FDM's (OFDM) spread spectrum technique distributes the data over a

“Proceedings of the 2005 American Society for Engineering Education Annual Conference & Exposition Copyright @2005 American Society for Engineering Education”

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Shahrabi, K., & Huang, F., & Setoodehnia, A., & Li, H. (2005, June), Demonstration Of Optical Orthogonal Frequency Division Multiplexing Paper presented at 2005 Annual Conference, Portland, Oregon. 10.18260/1-2--14229