Introduction to Optical Networks
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1 Yatindra Nath Singh Assistant Professor Electrical Engineering Department Indian Institute of Technology, Kanpur 1
2 What are optical network? Telecomm Networks build using various communication media - Twisted pair copper wire - Coaxial cable - Wireless (Radio, microwave, satellite, infrared) - Optical fiber 2
3 Optical fiber uses - carrier frequency of the order of Hz. - Bandwidth generally a smaller fraction of carrier frequency Large BW is available (of the order of 40 THz) Optical fiber has low loss in 1.3 µm and 1.55 µm bands 3
4 Advantages of fiber - Large Bandwidth-distance product. - immunity to noise and intereference - very low cost per unit bandwidth - easy upgradability using WDM technology - Tapping of signal from fiber without being detected - difficult. Copyright Dr.Y.N.Singh, IIT Kanpur 4
5 Due to all these advantages - Optical fiber Networks have high capacity - Can be used for providing the high bandwidth services - Even in wireless, infrared means high bandwidth connectivity. All the networks using optical fiber as transmission medium - optical networks When - transmitted signal remains in optical form till its arrival at destination - All-optical network 5
6 Degradation of signal in optical fiber - Dispersion - Attenuation Minimum dispersion at 1.3µm Minimum attenuation at 1.55µm 6
7 Telecommunication Networks Essentially consists of two portions A Backbone network B Access Networks Router/Switch Access Networks 7
8 A and B communicate with each other via switch/router (exchange in conventional terminalogy) These are Switched Networks. When the links are optical fiber - optical network But the signal might go through E/O and O/E conversion many times before reaching destination Commonly deployed networks with fiber as point-to-point link FDDI, DQDB, SONET/SDH, ATM, IEEE
9 All-optical networks - Broadcast transmitted optical signal - received by everyone. - Switched transmitted optical signal - switched through a specific path and received by the designated receiver. 9
10 Broadcast optical networks Tx Rx 4x4 Star Coupler Star topology network 10
11 Folded Bus 11
12 Tree-net topology 12
13 In Broadcast networks Bandwidth of single channel - shared by all the users. Media access using media access control protocols MAC protocols need to consider - The network is high speed High speed network - packet transmission time comparable to packet propagation time 13
14 To use the available bandwidth - Wavelength division multiple access (WDMA) - Time division multiple access (TDMA) - Code division multiple access (CDMA) O/E and E/O interfaces cannot operate above few tens of Gbit/s WDMA - currently implementable technology. 14
15 Optical TDMA, CDMA implementations WDMA - need very short pulses (can be generated by mode locked lasers). - Time division multiplexers/ demultiplexer requires very tight tolerance of fiber length (due to tight timing requirments) - Encoder and decoders will require again very tight tolerance in fiber length used for delay lines. - Dispersion - need to be taken care of. - Existing available devices can be used. 15
16 Media access control protocols for multiple channels Classification based on tunability - Fixed transmitter fixed receivers (FTFR) - Tunable transmitter fixed receivers (TTFR) - Fixed transmitter tunable receiver (FTTR) - Tunable transmitter tunable receiver (TTTR) Tunability makes the devices costly. - FTFR based multihop networks. 16
17 Strong similarity with switching networks Virtual topology is built over broadcast medium All the links seen here are on different wavelength Each node has two fixed transmitter and two fixed receiver 17
18 Some other Multihop topologies investigated in litrature - Hypercube - Manhattan street network (Torus) - Dual bus - Ring 18
19 For MAC protocols with tunable component proposed solutions generally use - Schedulling - a schedule for transmission and reception on the basis of stastistics is computed periodically by centralised or distributed algorithms and used for coordination. - pretransmission coordination using dedicated channel 19
20 Switched Network - uses optical switches classified as circuit switched or packet switched. Commercially emphasis on circuit switched all-optical networks. - due to near term feasibility. - also knows as wavelength routed networks These network can be used to provide virtual topology to be used by SDH, ATM or directly by IP layer. 20
21 IP ATM SDH IP ATM IP Optical Layer Optical Layer Optical Layer As time progresses IP over WDM will take over 21
22 A C D B E Physical topology with wavelength routes 22
23 A C D B E Virtual topology 23
24 In IP over WDM - possibility of reconfigurable topology means continous optimisation of topology depending on traffic condition can be done. Issues - Estimation of condition when the reconfiguration is needed (will be done by IP layer) - Management algorithms for optical layer to work with limited wavelength. - Fault management in optical layer. 24
25 Other exciting things in optical networks - Switching techniques and architectures. - Network architectures using devices and phenomenon based on optical nonlinearty - Multiwavelength soliton networks. 25
26 What we have been doing in IIT Kanpur in the area of optical networks - Studies in all-optical packet switched architecture. - Investigation on all-optical subscriber access network - Routing and management problems in IP over WDM 26
27 27
28 What future will have - All-optical packet switched WANs as backbone networks having huge capacities. - All-optical subscriber access networks (will be quite limited) Most of the access network is expected to be dominated by wireless. Infrared will have its share in it. 28
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