Difference between revisions of "Basics of Optical Communication Systems and WDM"
Sudharsanan (Talk | contribs) (Created page with 'Plastic fibres exist.') |
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Plastic fibres exist. | Plastic fibres exist. | ||
| + | capacity vs distance requirement drives us to move from copper cables to optical fibres. | ||
| + | attenuation vs wavelength has minimas at telecom wavelength (1310nm and 1550nm). | ||
| + | SONET - synchronous optical network. | ||
| + | SDH - synchronous digital heirarchy. | ||
| + | notation - OC-N => N x 51 Mbps | ||
| + | STM-X => X x 155Mbps | ||
| + | some standards | ||
| + | OC-48 : 2.5Gbps | ||
| + | OC-192 : 10Gbps | ||
| + | OC-768 : 40 Gbps | ||
| + | Bands | ||
| + | O(original) band - 1260 <-> 1360nm | ||
| + | E(Extended) band - 1360 <-> 1460nm | ||
| + | S(Short) band - 1460 <-> 1530nm | ||
| + | C(Conventional) band - 1530 <-> 1565nm | ||
| + | L(Long) band - 1565 <-> 1625nm | ||
| + | U(Ultra-long) band - 1625 <-> 1675nm | ||
| + | At 1310nm (although not an exact minimum) there is zero pulse broadening. | ||
| + | CWDM-coarse wavelength division multiplexing,DWDM-dense wavelength division multiplexing. | ||
| + | coarse: span:1260->1610nm , spacing:20nm | ||
Revision as of 14:35, 29 March 2010
Plastic fibres exist. capacity vs distance requirement drives us to move from copper cables to optical fibres. attenuation vs wavelength has minimas at telecom wavelength (1310nm and 1550nm). SONET - synchronous optical network. SDH - synchronous digital heirarchy. notation - OC-N => N x 51 Mbps STM-X => X x 155Mbps some standards OC-48 : 2.5Gbps OC-192 : 10Gbps OC-768 : 40 Gbps Bands O(original) band - 1260 <-> 1360nm E(Extended) band - 1360 <-> 1460nm S(Short) band - 1460 <-> 1530nm C(Conventional) band - 1530 <-> 1565nm L(Long) band - 1565 <-> 1625nm U(Ultra-long) band - 1625 <-> 1675nm At 1310nm (although not an exact minimum) there is zero pulse broadening. CWDM-coarse wavelength division multiplexing,DWDM-dense wavelength division multiplexing. coarse: span:1260->1610nm , spacing:20nm
