The main objective of this paper is to modulate the transmitted signal by using AM modulation technique signal. This paper propose 32 channels to be slicing which is considers one of the most effective solutions to the optical communication system design. Furthermore, at 10 Gbps return to zero is selected at the transmission side and hyperbolic-secant at the optical network unit. The results demonstrates that the non-return to zero pulse shape at bit rate of 20 Gbps at both downstream and upstream data transmission leads a high quality factor. The pulse shapes used in this paper are non-return to zero, return to zero, saw-up, triangle, raised cosine, and hyperbolic-secant pulses. Quality factor, bit error rate, and eye diagrams are derived for different pulse shapes then used to compare the results in order to select the best pulse shape that gives the best performance.
To reduce the overall cost of the proposed system, the bidirectional subcarrier multiplexed technique is used at the optical network unit to avoid using any optical laser sources at the receiver side for upstream data transmission. Wavelength division multiplexing passive optical network technique is used to share the overall bandwidth between 32 users with 0.8 nm spacing between each user. The introduced system is used to obtain a system bit rate of 10 Gbps and 20 Gbps downstream and 5 Gbps and 10 Gbps upstream. In this paper, we introduce a full fiber-to-the-home system architecture. And then we can achieve an Optical Code Division Multiplexer (OCDMA) system asynchronous transmission, secure communication, of capacity on demand, and high degree of scalability. the implementation of this system requiring anew design of OCDMA technique to avoid the suffering system from the problem of multiple access interference (MAI). Based on the analysis, it is recommended to develop an FSO system of 40 Gbps with 1550 nm wavelength and link range up to 700 km. Short link range between the transmitter and receiver can optimize the FSO system transmission parameters or components. CW laser input source with wavelength at 1550 nm, power 10mw.Free Space Optic (FSO) used as a media transmission line produces less effect in atmospheric attenuation. The main objective of this article is to modulate the transmitted signal by using Digital Phase Shift Keying (DPSK) modulation technique at 33% of modulation signal.
Free space optics system suffers from various limitations. This paper propose Free Space Optics Systems (FSO) which is considers one of the most effective solutions to the optical communication environment.0.00, especially for atmospheric turbulence due to the weather and environment structure.
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