Lecture 19Access Networks

Ivan Avrutsky, ECE 5870, Optical Communication Networks, Fall 2007, Lecture 18 Slide # 1

The Access Networks

- The last leg of the telecommunicationThe last leg of the telecommunication network delivering service to homes and businessesbusinesses.

- The bit rate request is relatively low, the distances are shortdistances are short.

- The network often requires re-fi ti d dconfiguration and upgrade

Ivan Avrutsky, ECE 5870, Optical Communication Networks, Fall 2007, Lecture 18 Slide # 2

Overall Network Architecture

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Services supported by access networks

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Architecture of Access Networks

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Classification of Access Networks

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Physical Carriers Used in Access Networks

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Optical Fibers in Access Networks

HFC – hybrid fiber coaxHFC hybrid fiber coax

FTTC – fiber to the curb

Ivan Avrutsky, ECE 5870, Optical Communication Networks, Fall 2007, Lecture 18 Slide # 8

Analogy with old-fashioned twisted pair networks

Ivan Avrutsky, ECE 5870, Optical Communication Networks, Fall 2007, Lecture 18 Slide # 9

Hybrid Fiber-Coax Network

RemoteH d d

Remote nodeHead end

(central office)

Ivan Avrutsky, ECE 5870, Optical Communication Networks, Fall 2007, Lecture 18 Slide # 10

Enhanced Hybrid Fiber Coaxy

• Increased bandwidth (up to 1GHz)Increased bandwidth (up to 1GHz)• Efficient modulation techniques (spectral

efficiency up to 7 bit/s /Hz)efficiency up to 7 bit/s /Hz)

Ivan Avrutsky, ECE 5870, Optical Communication Networks, Fall 2007, Lecture 18 Slide # 11

Fiber to the Curb (FTTC)( )

Ivan Avrutsky, ECE 5870, Optical Communication Networks, Fall 2007, Lecture 18 Slide # 12

PON Architectures

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Physical Layout

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Broadcast and Select PON

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Broadcast and Select WDM PON

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Wavelength-Routing PON

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Return Traffic Network

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PON using LED spectral slicing

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Concept of Spectral Slicing

Ivan Avrutsky, ECE 5870, Optical Communication Networks, Fall 2007, Lecture 18 Slide # 20

Home Work #2

Problem #12 3 with delay xT/2kProblem #12.3, with delay xT/2(page 659 in the 2-nd edition book)P id l l ti d idProvide general solution and consider a

particular case with k = 8 and x = 100.Note, k stages would be required.

Due Nov. 27 before the class starts

Ivan Avrutsky, ECE 5870, Optical Communication Networks, Fall 2007, Lecture 18 Slide # 21

Confirmed in-class presentations1. Optical Modulation Formats (IEEE J. Quantum Electronics, 2006) – Saurab

Parkash

2. Optical Technologies for High Bit Rate Fiber Communication (Bell Labs Technical Journal, 2006) – Venkata Bokka

3. WDM-PON (J. Lightwave Technology, 2007) – Harpreet Singh3 O (J g a e ec o ogy, 00 ) a p eet S g

4. Spectral Phase Encoding (J Optical Networking, 2007) – Adrian Radusea

5. Gain Uniformity in SOA (J Optical Networking, 2007) – Sandeep Reddy

6. Advanced Modulation Formats (J. Lightwave Technology, 2006) – Lakshmi Janardhan

7. Advanced modulation formats (Int. J. Electronic Communication, 2007) –( )Uma Machani

8. Optical fiber probe for Raman spectroscopy (Applied Optics, 2004) – Umer Khalid

Ivan Avrutsky, ECE 5870, Optical Communication Networks, Fall 2007, Lecture 18 Slide # 22