03-05-2012, 03:33 PM
ANALYSIS OF FIBER NONLINEARITY FOR VARIOUS POWER LEVELS OF INDIVIDUAL CHANNELS IN DWDM SYSTEM
[attachment=21181]
INTRODUCTION
Fiber-optic communication is a method of transmitting information from one place to another by sending pulses of light through an optical fiber. The light forms an electromagnetic carrier wave that is modulated to carry information. The communication medium in most electronic communications systems is either a wire conductor cable or free space. But now a new medium is growing in popularity, the fiber-optic cable. A fiber optic cable is essentially a light pipe that is used to carry a light beam from one place to another. Light is an electromagnetic signal like a radio wave. It can be modulated by information signal and sent over the fiber optic cable. The frequency of light is extremely high, it can accommodate very wide bandwidths of information and extremely high data rates can be achieved with excellent reliability [4].
DWDM SYSTEMS
Wavelength Division Multiplexing (WDM) involves the transmission of a number of different peak wavelength optical signals in parallel on a single optical fiber. The WDM standard developed by the International Telecommunication Union (ITU) specifies channel spacing’s in terms of frequency. WDM is a method of combining multiple services on a single fiber specified by ITU-T G.692. Many different wavelengths can be sent along a fiber simultaneously in the 1300-1600nm spectrum. This is achieved through WDM. WDM is nothing but N independent optically formatted information streams each transmitted at a different wavelength are combined with optical multiplexer and send over the same fiber.
FIBER NONLINEARITIES
Fiber nonlinearities become a problem when several channels coexist in the same fiber. Nonlinearity effects arose, when optical fiber data-rates, transmission lengths, number of wavelengths, and optical power levels are increased [8].
• Stimulated Brillouin Scattering (SBS)
• Stimulated Raman Scattering (SRS)
• Four-Wave Mixing (FWM)
ANALYSIS OF SRS IN DWDM SYSTEM DESCRIPTION
A model of optical communication link is stimulated using OPTSIM software. OPTSIM supports two simulation engines. They are Block mode simulation engine and Sample mode simulation engine. In Block mode simulation engine, signal data is represented as one block of data and is passed between block to block. In sample mode simulation engine, signal data is represented as single sample that is passed between block to block. In DWDM systems, Stimulated Raman Scattering (SRS) in Optical communication is the main parameter that has to be analyzed. When high intensity Optical input power is encountered is single mode fiber, the SRS effect will occur. Due to this SRS effect, the minimum power that could be sent through the fiber is reduced. By decreasing the value of input power the SRS effect is decreased. In DWDM systems,
[attachment=21181]
INTRODUCTION
Fiber-optic communication is a method of transmitting information from one place to another by sending pulses of light through an optical fiber. The light forms an electromagnetic carrier wave that is modulated to carry information. The communication medium in most electronic communications systems is either a wire conductor cable or free space. But now a new medium is growing in popularity, the fiber-optic cable. A fiber optic cable is essentially a light pipe that is used to carry a light beam from one place to another. Light is an electromagnetic signal like a radio wave. It can be modulated by information signal and sent over the fiber optic cable. The frequency of light is extremely high, it can accommodate very wide bandwidths of information and extremely high data rates can be achieved with excellent reliability [4].
DWDM SYSTEMS
Wavelength Division Multiplexing (WDM) involves the transmission of a number of different peak wavelength optical signals in parallel on a single optical fiber. The WDM standard developed by the International Telecommunication Union (ITU) specifies channel spacing’s in terms of frequency. WDM is a method of combining multiple services on a single fiber specified by ITU-T G.692. Many different wavelengths can be sent along a fiber simultaneously in the 1300-1600nm spectrum. This is achieved through WDM. WDM is nothing but N independent optically formatted information streams each transmitted at a different wavelength are combined with optical multiplexer and send over the same fiber.
FIBER NONLINEARITIES
Fiber nonlinearities become a problem when several channels coexist in the same fiber. Nonlinearity effects arose, when optical fiber data-rates, transmission lengths, number of wavelengths, and optical power levels are increased [8].
• Stimulated Brillouin Scattering (SBS)
• Stimulated Raman Scattering (SRS)
• Four-Wave Mixing (FWM)
ANALYSIS OF SRS IN DWDM SYSTEM DESCRIPTION
A model of optical communication link is stimulated using OPTSIM software. OPTSIM supports two simulation engines. They are Block mode simulation engine and Sample mode simulation engine. In Block mode simulation engine, signal data is represented as one block of data and is passed between block to block. In sample mode simulation engine, signal data is represented as single sample that is passed between block to block. In DWDM systems, Stimulated Raman Scattering (SRS) in Optical communication is the main parameter that has to be analyzed. When high intensity Optical input power is encountered is single mode fiber, the SRS effect will occur. Due to this SRS effect, the minimum power that could be sent through the fiber is reduced. By decreasing the value of input power the SRS effect is decreased. In DWDM systems,