Lecture2-228a s10 v2

Lecture2-228a s10 v2 - Lecture 2- Multiplexing and Basics...

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Lecture 2- Multiplexing and Basics of Propagation in Dielectric Media ECE 228A Spring 2010 2.1
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228A Course Mechanics Textbook : Fiber Optic Communication Systems, Third Edition, 2002, G. P. Agrawal, Wiley Series in Microwave and Optical Engineering, ISBN 0-471- 21571-6 Exams : One midterm and one final Homework : Assigned weekly each Tuesday in class. Due following Tuesday. Late policy: 10% per day late, maximum 3 days late. No grade for more than 3 days late. Grading : Class Participation: 5% Homework: 25% Midterm: 20% roject: 0% Project: 20% Final: 30%
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Communication Access will be Wireless (microwaves) (Antenna may be in home (picocells). ell phones (Broadband data? 10 Mbps) Cell phones (Broadband data? 10 Mbps) WiFi (WiMax) computer access 50 Mbps Transmission will be optical ptical fibers Optical fibers Transmitters (Semiconductor lasers and Optical modulators Receivers (PIN and APD Photodetectors) FTTH: Fiber to the home APON BPON GPON PON (Ethernet passive optical network) EPON (Ethernet passive optical network) WDM PON
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Capacity and Repeater Spacing st Generation egenerator 1st Generation 2nd Generation R x 50 to 100 Mbps 10 km MMF MF Regenerator LED T x 50 km 3rd Generation R x Few 100 Mbps to 1.7 Gbps 5 Gbps to SMF SMF 1.31 m MM Laser T x 1.55 m SM 4th Generation 100 km R x 2.5 Gbps to 10 Gbps SM DFB DFA Laser T x R x Laser T x ( 1 ) SM DFB Laser T x ( 2 ) SM DFB aser T MUX 100’s km SMF R x R 2.5 Gbps to 10 Gbps per wavelength. 8 to 128 wavelengths EDFA DeMUX 1.4 Laser T x (  1 ) x ECE 228A Spring 2010
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Multiplexing Techniques Multiplexing is the technique used to carry several different information channels on a common physical medium. The four ternatives are: alternatives are: Time Division Multiplexing (TDM) Frequency Division Multiplexing, indicated as “Wavelength Division ultiplexing” (WDM) in optics Multiplexing (WDM) in optics Space Division Multiplexing (SDM) Code Division Multiplexing (CDMA) Multilevel coding 1.5 ECE 228A Spring 2010
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Multiplexing Techniques Time Division Multiplexing (TDM) Channel 1 bits/sec Example: SONET multiplexing, allowing also different bit rates to be multiplexed Channel 2 B bits/sec B bits/sec NB bits/sec UX T B /N = 1/NB . . MU Channel N T = 1/B B bits/sec . Time Division TDM is usually performed in the electronic domain, but is is now done also in the optical domain, for bit rates greater or equal to 40Gb/s 1.6 B Multiplexer ECE 228A Spring 2010
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Multiplexing Techniques avelength Division Multiplexing (WDM) wer Wavelength Division Multiplexing (WDM) B bit/sec Channel 1 1 Optical Po w B bit/sec Channel 2 2 MUX 1 N 1 2 . . . . - B bit/sec NB bit/sec Channel N N N . . Wavelength ivision It is the most common 1.7 Division Multiplexer (WDM Mux) multiplexing approach in the optical domain.
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Lecture2-228a s10 v2 - Lecture 2- Multiplexing and Basics...

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