Dense wavelength division multiplexing

A POWERPOINT PRESENTATION … ON DENSE WAVELENGTH DIVISION MULTIPLEXING --PRESENTED BY NITESH SRIVASTAVA DEPT- ECE SEM- 6TH ROLL- 32

Wavelength division Multiplexing : ,[object Object], carrier signals on a single optical fiber by using different wavelengths of laser light to carry different signals. ,[object Object], > Coarse WDM > Dense WDM

What is dwdm ?? > Dense wavelength division multiplexing (DWDM) is a technology that uses more than eight multiplexed signals to transmit many wavelengths of light simultaneously over a single optical fiber .

HISTORY OF DWDM :: 64 to 160 channels in 1550 nm window Next generation DWDM system Channel spacing of 0.2 to 0.4 nm 16 to 40 channels in 1550nm window DWDM (Dense wdm) Channel spacing of 0.8 to 1.6 2 to 8 channels in 1550nm window Passive (or) 2nd generation WDM Channel spacing of~ 3.2nm 2 channels WWDM (Wideband WDM) 1310nm & 1550nm Late 1990’s Mid 1990’s Early 1990’s 1980’s

A dwdm system:: *A basic DWDM system contains several main components: (a) A DWDM terminal multiplexer (b) An intermediate line repeater (c) An intermediate optical terminal (d) A DWDM terminal demultiplexer (e) Optical Supervisory Channel (OSC)

Block diagram of dwdm system ::

Itu-tg :: ,[object Object], structure, though some vendors have opted to use 100 megabit Ethernet or another signal format. ,[object Object], may also perform forward error correction (FEC) via 'digital wrapper' technology, as described in the ITU-TG.709 standard. ,[object Object], with older but more standard SONET/SDH systems.

WAVELENGTH CONVERTING TRANSPONDERS :: ,[object Object], wavelength of a client-layer signal into one of the DWDM system's equivalent internal wavelengths. ,[object Object], on the additional function of signal regeneration. Signal regeneration in transponders quickly evolved through 1R to 2R to 3R . 1R 2R 3R Retransmission Re-time, Re-transmit Re-time, Re-transmit, Re-shape

RECONFIGURABLE OPTICAL ADD-DROP MULTIPLEXER :: ,[object Object], for the dropping and adding of certain wavelength channels. Adding or dropping wavelengths requires manually inserting or replacing wavelength-selective cards.

OPTICAL CROSS CONNECTS:: (OXC) ,[object Object], interconnection device is needed to route the signals from an input port to the desired output port.These devices are called optical crossconnectors(OCXs).Various categories of OXCs include electronic, optical, and wavelength selective devices.

CHANNEL SPACING :: ,[object Object], multiplexed signals is known as the Channel Spacing. Since the wavelength of operation is inversely proportional to the frequency, a corresponding difference is introduced in the wavelength of each signal.

CATeGORIES OF WAVELENGTH SWITCHeS:: ,[object Object]

Wavelength-Independent Reconfigurable switch.

Wavelength-Selective Reconfigurable Switch.

DWDM , ideally it should have additional optical switching capability to implement dynamically reconfigurable interconnections necessary for the next generation systems.

SONET WITH DWDM :: ,[object Object], investments can be preserved. Often new implementations can eliminate layers of equipment. SONET TERMINAL WDM OC-n FIBER OC-48C ATM SWITCH OC-48C LAYER -3 SWITCH

DWDM-FM :: ,[object Object],owned by Eagle Broadcasting Corporation in the Philippines. The station's studio was located in EDSA, Quezon City and its transmitter located at Commonwealth Avenue, Quezon City.

IP OVER DWDM :: * The problem: The explosive growth of the Internet spurred by high speed access networks and flat-rate mobile billing plans has caused ferocious competition in the telecom service provider market. * Solutions: One potential answer is IP over DWDM.

REQUIRMENTS IN THE METROPOLITAN AREA :: ,[object Object], respects from those in the long-haul network market. > Some key requirements for DWDM systems in the MAN include the following---- • Multiprotocol support • Scalability • Reliability and availability • Openness (interfaces, network management, standard fiber types,electromagnetic compatibility) • Ease of installation and management • Size and power consumption • Cost effectiveness

VALUE OF DWDM IN METROPOLITAN AREA :: ,[object Object],Then the equipment savings made it the solution of choice for new long-haul routes, even when ample fiber was available. Alternatives for capacity enhancement exist, such as pulling new cable and SONET overlays, but DWDMcan do more.

WHY DWDM ?? ,[object Object], potentially unlimited transmission capacity is the most obvious advantage of DWDM technology. The current investment in fiber plant can not only be preserved, but optimized by a factor of at least 32. capacity can be obtained for the cost of the equipment, and existing fiber plant investment is retained.

benefits OF DWDM :: ,[object Object]

Dense wavelength division multiplexing

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