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WDM LAN Optical Backbone Networks phần 2

tỉm hiểu WDM LAN quang đường trục mạng | B What fiber provides Fiber is light small . Fiber itself is immune to EMI HPM No cable radiation Fiber provides tremendous bandwidth Telecom wavelengths 193 THz carrier frequency Telecom amplifiers allow aggregate bandwidth of several terabits on a single fiber Individual telecom wavelength channels now carry 10 - 40 Gb s Fiber carries high bandwidth signals with Extremely low loss 0.2 dB km independent of signal rate or format Extremely low distortion Fiber is transparent . and that allows WDM Transparency means Signals do not interact in the fiber to first order Ability to carry signal does not depend on rate format polarization . 1 ------------------------------------------------------- the elements of succes Some choices multimode or single mode Multimode fiber guides many light rays Different arrival times of rays can distort optical pulses Used in short distances low cost environments Single mode fiber highest quality transmission Used in high capacity long haul lightwave systems Compatible with sophisticated optical processing and amplifiers Advantages Disadvantages Single mode Huge upgrade potential especially WDM and switching for networks amplifiers are i bl Standards needed for Connector designs suitable for avionics applications Multimode Cheap easy to connect Limited upgrade possible amplifiers not usually available 12 tfTelcorc Vision Aircraft Backbone Network Future Networking will require a novel infrastructure access control CPÚ0 CPU2 Performance Dashboard GUI Approved for Public Release Distribution Unlimited Physical Layer Logical Connection Backbo Netwo T2 Configure Network Paths T3 Reconfigure Network Paths T1 New Equipment Activated Net Cntrl 13 X In use X available T1 20 44 T2 23 41 T3 22 .