Advanced optical fiber systems


What is WDM?
The scheme of combining a number of wavelength over a single fiber called wavelength division multiplexing. Read more

Features of WDM
1. Capacity upgrades - Since each wavelength support independent data rate in Gbps.
2. Transparency - WDM can carry fast asynchronous, slow synchronous, synchronous analog and digital data. Read more

WDM driver is classifying into three types:
 1. Bus driver 2. Function driver 3. Filter driver
Read more

Advantages and disadvantages of WDM
Advantages: 1.  Easier to reconfigure 2. Full duplex transmission is possible
Disadvantages: 1. Signals cannot be very close 2. Difficulty in a cascaded topology Read more

1. FDM to optical fiber 2. Optical transport network  Read more


What is DWDM?

Dense wavelength division multiplexing is technology put data from different sources together in an optical fiber, which uses single-mode fiber to carry multiple light waves of different frequencies. Read more

Application of DWDM :
1. Utilize the existing thin fiber 2. Building or expanding network Read more

Advantages: 1. Improve scalability 2. Provide extra resilience
Disadvantages: 1. Complex technology requires 2. More space Read more 


What is SONET?
It is a synchronous system which provides simple network infrastructure and more flexible network. SONET is very similar to SDH. SONET is the standard used in the US where SDH is the standard used. Read more

Applications of SONET
1. SONET was originally designed for a public telephone network. 2. SONET acts as a carrier of multiple higher-level application protocol Read more

Advantages and disadvantages of SONET :
Advantages: 1. Reduced cost  2. It offers network survivability feature
Disadvantages: 1. No interoperable standard 2. Tributary services require SONET mux services Read more