Abstract
Fiber optics is the fastest and reliable means of transferring large amounts of data Optical fiber links are used for local area networks to world wide data communication. Fiber-optic communication is a method of transmitting information from one place to another by sending pulses of light through an optical fiber. Digital optical communications explores the practical applications of this union and applies digital modulation techniques to optical communications systems. Intensity modulation is a modulation technique in which the optical output power of a source is varied in accordance with some characteristic of the modulating signal. Fiber optics trainer ST 2502, which is a single board fiber optic transmitter receiver module providing two independent fiber optic communication links, is used in the present work. It is used to study and analyze the analog & digital signals modulation in relation to the losses in optical fiber. This work intends to obtain an intensity modulation of a digital signal transmitted over fiber optic cable and demodulate the same at receiver end to get the original signal. Different fiber optic cables namely SIPMMA fiber, thermocouple type K with glass fiber/stainless cables, OFNR cable is used to obtain intensity modulation using digital input signal. It has been investigated that the output of detector is affected with the change in cable and the size of cables also plays an important role in data transmission. The study of switched faults in intensity modulation is also taken up in the study.
Highlights
Communication plays an important role in the transmission of information using the communication devices like mobiles, telephone sets and other mediums like Internet
Optical fiber links are used for local area networks to world wide data communication
Third-generation fiber-optic systems operated at 1.55 μm and had losses of about 0.2 dB/km due to pulse-spreading at that wavelength. These losses were overcome by using dispersion-shifted fibers, designed to have minimal dispersion at 1.55 μm or by limiting the laser spectrum to a single longitudinal mode. These developments eventually allowed third-generation systems to operate commercially at 2.5 Gbit/s with repeater spacing in excess of 100 km.The fourth generation of fiber-optic communication systems used optical amplification to reduce the need for repeaters and wavelength-division multiplexing to increase data capacity
Summary
Communication plays an important role in the transmission of information using the communication devices like mobiles, telephone sets and other mediums like Internet. Communication engineering deals with the transmission of various signals from one point to another. Fiber optics is the fastest and reliable means of transferring large amounts of data. Optical fiber links are used for local area networks to world wide data communication. Optical communication system use high carrier frequencies in the visible or near infrared region of the electromagnetic spectrum
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