Ch1Sec2BW

Ch1Sec2BW - THE FIBER FORUM Fiber Optic Communications...

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THE FIBER FORUM Fiber Optic Communications JOSEPH C. PALAIS PRESENTED BY
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Joseph C. Palais 1.2 2 Section 1.2 Basic Communications System Transmitter Information Channel Receiver Messages are sent from the transmitter through the information channel to the receiver.
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Joseph C. Palais 1.2 3 INFORMATION CHANNELS Unguided Channels (Atmosphere) Radio Broadcast Television Broadcast Wireless Satellite Guided Channels Conducting Wires Waveguides Fibers
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Joseph C. Palais 1.2 4 INFORMATION CHANNELS Applications For Guided Channels Applications include: cable television telephone data links [i.e., local area networks (LANs)] The triple play: Voice Video Data
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Joseph C. Palais 1.2 5 GENERAL OPTICAL SYSTEM Message Origin Carrier Source Coupler Modulator Coupler Detector Processor Destination Optic Domain Electric Domain Transmitter Receiver Channel
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Joseph C. Palais 1.2 6 COMPONENTS OF A GENERAL OPTICAL SYSTEM 1.2.1 Message Origin : Puts the message into electrical form. Examples include the microphone and the video camera. 1.2.2 Modulator : Converts the electrical message into proper format. Impresses the signal onto the optical carrier. Modulation formats are analog and digital .
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Joseph C. Palais 1.2 7 COMPONENTS OF A GENERAL OPTICAL SYSTEM Analog (continuous) Time Digital (discrete) 1 0 1 0 1 Time
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Joseph C. Palais 1.2 8 COMPONENTS OF A GENERAL OPTIC SYSTEM 1.2.3 Carrier Source : Generates the lightwave on which the information is carried. Common devices are: laser diode (LD) light emitting diode (LED) The carrier source is intensity modulated . As the input current changes, the output optical power changes in the same way.
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Joseph C. Palais 1.2 9 COMPONENTS OF A GENERAL OPTIC SYSTEM The output power of the light source is proportional to the input current. Electrical Domain Optical Domain Carrier Source ELECTRICAL CURRENT, I in OPTICAL POWER, P OUT
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Joseph C. Palais 1.2 10 GENERAL FIBER OPTIC SYSTEM Intensity modulation: The transfer characteristics of the ideal light source is Optic Power (P) Input current (I)
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Joseph C. Palais 1.2 11 GENERAL FIBER OPTIC SYSTEM Example: 0 0 t t I P The above graphs indicate that the optic power is directly proportional to the input current. Input Current Output Power
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Joseph C. Palais 1.2 12 GENERAL FIBER OPTIC SYSTEM 1.2.4 Coupler: Couples light from the source to the fiber channel. The efficiency may not be high.
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This note was uploaded on 05/11/2010 for the course EEE EEE-448 taught by Professor Palais during the Fall '09 term at ASU.

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Ch1Sec2BW - THE FIBER FORUM Fiber Optic Communications...

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