Lecture2-228a s10 v2(3)

Lecture2-228a s10 v2(3) - Lecture 2- Multiplexing and...

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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 P m MM Laser T x 1.55 P 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 ( O 1 ) SM DFB Laser T x ( O 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 ( O6 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 O 1 Optical Po w B bit/sec Channel 2 O 2 MUX O 1 O N O O 1 O 2 . . . . O - B bit/sec NB bit/sec Channel N O N O 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(3) - Lecture 2- Multiplexing and...

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