Optical_Networks - IK2211 Data Links and Local Area...

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Optical Networks IK2211 Data Links and Local Area Networks Peter Sjödin KTH School of ICT
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Topics Optical Systems and Devices WDM transmission Add-drop multiplexing Cross-connects Digital Optical SDH/SONET Protection and restoration Control MPLS, GMPLS Neighbour discovery and link management LMP l Signaling for protection and restoration Optical routing and path selection Passive Optical Networks (PON) Separate lecture 2
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Optical Systems and Devices
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4 Optical Systems and Devices Regeneration of optical signal Combination of multiple signals on a path Adding signals into (dropping signals from) a path From B. A. Forouzan: Data Communications and Networking, 3rd ed, McGraw-Hill
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5 WDM—Wavelength Division Multiplexing Single wavelength Multi- wavelength Single wavelength Multiplexer Demultiplexer
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6 Cross-Connects Data received on one port is transmitted on another 1 2 N input ports . . . . 1 2 N output ports . . . . N x N switch
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7 Opto-Electrical Switches ”OEO” switches Optical input, electrical switching, optical output O/E conversion can be complex and expensive Signal regeneration and wavelength translation ”for free” Electrical switch input ports output ports 1 2 N . . . 1 2 N . O/E E/O
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8 Photonic Switches ”OOO” switches Potentially less expensive No support for regeneration, wavenlength translation, traffic monitoring, … Optical switch input ports output ports 1 2 N . . . 1 2 N .
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9 No Switch Is Perfect Switching speed Time to reconfigure the switch Power loss All power switched from input to output Wavelength dependency Polarization dependency
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10 Photonic Switches Technology Opto-mechanical switches Most common Moving fiber Moving deflector Micro-Electro-Mechanical Systems (MEMS) Semi-conductor manufacturing process Electro-optic switches 2 x 2 couplers Voltage-controlled refraction index Acousto-optic, thermo-optic, magneto-optic, liquid crystal optical switches, …
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11 WDM System Add/drop and cross- connect configuration Multiplexer Demultiplexer N x N Transponders Transponders Added wavelengths Dropped wavelengths Transponders Combine receive/transmit on different wavelengths
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SONET/SDH
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13 Frame Format Sent at a rate of 8000 frames per second Organized as a matrix with 9 × 90 octets (STS-1) Three columns of administration overhead Payload is called Synchronous Payload Envelope (SPE) Virtual Container in SDH Higher rates (STS-N) 3N columns of Administration overhead, 90N octets per row Byte interleaving of N STS-1 signals Illustration from B. A. Forouzan: Data Communications and Networking, 3rd ed, McGraw-Hill
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Optical_Networks - IK2211 Data Links and Local Area...

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