Wdm and dwdm ppt
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This document discusses wavelength division multiplexing (WDM) and dense wavelength division multiplexing (DWDM). It describes how WDM uses different wavelengths to transmit multiple signals over the same fiber, with wider channel spacing. DWDM is then introduced as a way to increase capacity by reducing channel spacing. The key advantages and disadvantages of both WDM and DWDM are outlined. Standards for DWDM channel plans are also mentioned.
Wdm and dwdm ppt
- 2. Multiplexing Wavelength Division Multiplexing (WDM) Advantages Disadvantages Dense Wavelength Division Multiplexing (DWDM) Advantages Disadvantages DWDM Standards Comparison between WDM and DWDM
- 3. Multiplexing Types A process where multiple analog message signals or digital data streams are combined into one signal over a shared medium. Time division multiplexing. Frequency division multiplexing. Optically Time division multiplexing. Wavelength division multiplexing.
- 5. A B l1 l2 Wavelength Division Multiplexer Fibre l1 + l2 Wavelength Division Demultiplexer l1 l2 X Y
- 6. Multiple channels of information carried over the same fiber, each using an individual wavelength. A communicates with X and B with Y as if a dedicated fiber is used for each signal. Typically one channel utilizes 1320 nm and the other 1550 nm. Broad channel spacing, several hundred nm. WDM is a way of transmitting more data by separating channels by "color".
- 7. 1. Advantages: Fewer wires or channels to transmit and receive data. A single fiber-optic cable can handle dozens of channels, instead of using 12 cables, you only use 1 .
- 8. 2. Disadvantages: Complex transmitters and receivers. They must be wide-band, which means they are more expensive and possibly less reliable.
- 9. A B C l1 Wavelength Division Multiplexer Fibre l2 l3 Wavelength Division Demultiplexer l1 l2 l1 + l2 + l3 l3 X Y Z
- 10. Multiple channels of information carried over the same fiber, each using an individual wavelength. Dense WDM is WDM utilizing closely spaced channels. Channel spacing reduced to 1.6 nm and less . Cost effective way of increasing capacity without replacing fiber. Commercial systems available with capacities of 32 channels and upwards; > 80 Gb/s per fiber.
- 11. T1 T2 TN l1 Wavelength Division Multiplexer Fibre l2 lN Wavelength Division Demultiplexer l1 l2 l1 + l2 ... lN lN R1 R2 RN
- 12. Multiple channels of information carried over the same fiber, each using an individual wavelength. Unlike WDM channels are much closer together. Transmitter T1 communicates with Receiver R1 as if connected by a dedicated fiber as does T2 and R2 and so on.
- 13. 1. Advantages: Greater fiber capacity. Easier network expansion. DWDM can give increases in capacity which TDM cannot match. Incremental cost for a new channel is low.
- 14. 2. Disadvantages: Not cost-effective for low channel numbers. Introduces another element, the frequency domain, to network design and management. SONET/SDH network management systems not well equipped to handle DWDM topologies. DWDM performance monitoring and protection methodologies developing.
- 15. ITU Recommendation is G.692 "Optical interfaces for multichannel systems with optical amplifiers“. G.692 includes a number of DWDM channel plans. Channel separation set at: 50, 100 and 200 GHz . Equivalent to approximate wavelength spacings of 0.4, 0.8 and 1.6 nm. Channels lie in the range 1530.3 nm to 1567.1 nm (so-called C-Band). Newer "L-Band" exists from about 1570 nm to 1620 nm.
- 16. WDM Channel Spacing 1310 nm lasers used in conjunction with 1550 nm lasers DWDM Small 200GHz and Small Number of Bands Used O and C Cost per Channel Low High 2 Hundreds of Channels Possible PON Long-haul Number of Channels Delivered Best Application C and L
- 17. Thank You……