Abstract
The role of the optical transmitter is to generate the optical signal, impose the information bearing signal, and launch the modulated signal into the optical fiber. The semiconductor light sources are commonly used in state-of-the-art optical communication systems. Optical communication systems has become one of the important systems after the advent of telephone, internet, radio networks in the second half of the 20th century. The development of optical communication was caused primarily by the rapidly rising demand for Internet connectivity. Orthogonal frequency-division multiplexing (OFDM) belongs to a wide class of multicarrier modulation. Orthogonal frequency-division multiplexing has succeeded in a wide range of applications in the wireless communication domain from video/audio digital broadcasting to wireless local area networks (LANs). Although their very low loss compared to that of the wireless counterpart, optical systems still need renovation for spans commonly less than150 Km. In this paper advantages of optical orthogonal frequency division multiplexing in communications systems will explained.
Highlights
Communication systems transmit information from a transmitter to a receiver through the construction of a time-varying physical quantity or a signal
The advent of the optical amplifier heralded a new era of optical communications in which a massive number of wavelength-division multiplexing (WDM) signals can be conveyed over thousands of kilometers [1]
The fundamental advantage of orthogonal frequency-division multiplexing, namely, its robustness against optical channel dispersion was not recognized in optical communications until 2001, when Dixon et al 9 proposed the use of Orthogonal frequency-division multiplexing (OFDM) to combat modal dispersion in multimode fiber
Summary
Communication systems transmit information from a transmitter to a receiver through the construction of a time-varying physical quantity or a signal. The advent of the optical amplifier heralded a new era of optical communications in which a massive number of wavelength-division multiplexing (WDM) signals can be conveyed over thousands of kilometers [1]. The fundamental advantage of orthogonal frequency-division multiplexing, namely, its robustness against optical channel dispersion was not recognized in optical communications until 2001, when Dixon et al 9 proposed the use of OFDM to combat modal dispersion in multimode fiber. The classical multicarrier modulation uses nonoverlapped band limited signals and can be implemented with a bank of large numbers of oscillators and filters at both transmit and receive ends [13]. The major disadvantage of multicarrier modulation is that it requires excessive bandwidth This is because to design the filters and oscillators cost-effectively, the channel spacing has to be a multiple of the symbol rate, greatly reducing the spectral efficiency. This orthogonality originates from a straightforward correlation between any two subcarriers, given by
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