CDMA (2, 2.5, 2.75G)
GSM/2G
IPTV
SDH
SONET
VoIP
WiMAX
WLL
WCDMA / 3G
DWDM
FTTH
GPON
 

Emerging Technology » DWDM

 
Technology

DWDM

Full Name

Dense Wavelength Division Multiplexing

Description

Dense wavelength division multiplexing (DWDM) is a fiber-optic transmission technique that employs light wavelengths to transmit data parallel-by-bit or serial-by-character.

Origin/Facts

In 1998, Bell Labs transmitted 100 simultaneous optical signals, each at a data rate of 10 gigabits per second for a distance of nearly 250 miles (400 km). In this experiment, the DWDM technology was introduced which increased the total data rate on one fiber to one terabit per second (1012 bits per second).

Unit

Data Rates

DWDM systems at 2.5 Gbps should use the full capability of the embedded equipment and fiber base.
A DWDM network with a mix of SONET signals operating at :OC 48 (2.5 Gbps) and OC192 (10 Gbps) over a DWDM infrastructure can achieve capacities of over 40

Services Offered

Application areas
Telecommunications
Local Area Networks
Long distance fiber optic links.
Metro rings.

Range

Dense Wave Division Multiplexing technology allows multiplexing of up to 160 wavelengths of light on a single fibre, supporting a capacity of 1.6 Terabits per second

Frequency/Channel

The center of the DWDM band lies at 193.1 THz with standard channel spacing of 200 GHz and 100 GHz.

Advantages/Disadvantages

Advantages:
The DWDM infrastructure can deliver the necessary capacity expansion.
It is protocol and bit rate independent.
No new fiber configuration or qualification is required. All that needs to be specified is the transmission speed.
A DWDM infrastructure is designed to provide a graceful network evolution for service providers.
Not all networks require enough bandwidth to deploy DWDM.

Disadvantages:
It does not offer service visibility at the packet or circuit level.

Present/Future in SAMENA

? VNSL is building a DWDM cable system connecting India, UAE, Saudi Arabia, Egypt, Italy and France. It is 10,000 KM undersea project expected to be commissioned by 2010. ? TWA-1 is a 1300km submarine telecommunications cable linking the United Arab Emirates, Oman, and Pakistan. ? Qatar recently deployed huawei?s DWDM during Asian games in Qatar ? NEC is building a DWDM network from Sri lanka to Madlive ? Pakistan was the first country in South Asia to have a DWDM network

Worldwide Customers

Global takeup of DWDM-based backbones is rising. Major customers include ISPs (15%), VoIP providers (12%), international service providers (10%), wholesale service providers (12%), and cable providers (10%). Cellular operators tend to form a smaller portion of the DWDM takeup (perhaps around 8%). However, this trend will change, as data traffic increases and subscriber bases expand.

 
Home
About Us
Members Resources
Contact Us
 
Emerging Technologies
Executive Profiles
Press Releases
News Publications
 
Whitepapers
Working Groups
Telecom Directory
Regulatory Information
 
15 + 5 = ?