Introduction Recent progress in transmission capacity of dense wavelength-division multiplexed (DWDM) signals in a trunk optical fiber line now allows transmission of data beyond 10 Tbit/s over more than 100 km [1], [2]. The DWDM technology has to be applied to future millimeter-wave fiber-radio systems in order to take the capability to deal with the large amount of data capacity. There have b...

In this paper Raman-parametric amplifier has been investigated for long haul Dense Wavelength Division Multiplexed (DWDM), L-band transmission. The performance of the proposed hybrid model has been compared in terms of signal gain and OSNR with FOPA and EDFA FOPA. Feasibility of Raman-FOPA for future long haul extended DWDM systems has been explored. Results indicate an achievable OSNR of 28 dB...

This paper demonstrates the comparison of 40 Gbps DWDM system using hybrid optical amplifier configurations (EDFA-EDFA and EDFA-SOA ) are implemented with RZ and NRZ encoding techniques at various distance along with DCF having dispersion 80 ps/nm/Km . DWDM systems with 4 channels each having a bit rate of 10 Gbps and 0.8 nm equal channel spacing. The performance of EDFA-EDFA and EDFA-SOA hybri...

Dense Wavelength Division Multiplexing (DWDM) system is limited by different impairments like optical attenuation, crosstalk, chromatic dispersion, polarization mode dispersion, Scattering etc. All of these impairments restrict the transmission distance and bandwidth. In the Present Scenario the DWDM system needs significant improvement, where analyzing the crosstalk of an Acousto-Optic Tunable...

We describe the design, fabrication, and excellent performance of an optimized deep-etched high-density fused-silica transmission grating for use in dense wavelength division multiplexing (DWDM) systems. The fabricated optimized transmission grating exhibits an efficiency of 87.1% at a wavelength of 1550 nm. Inductively coupled plasma-etching technology was used to fabricate the grating. The de...

This paper carries out a numerical simulation investigating three different modulation formats: carrier suppressed return to zero (CSRZ), modified duobinary (MDRZ) and (RZ). The purpose of this investigation is find the optimum format for hybrid optical code division multiple accesses–dense wavelength multiplexing (optical CDMA/DWDM) system with implementation an electro-optic phase modulator (...

A novel DWDM channel monitoring technique based on the conversion fromwavelength domain to time domain by performing a real-time optical Fourier transform over the whole DWDM system bandwidth is proposed and experimentally demonstrated. The use of chromatic dispersion-based optical Fourier transformers has been validated in the case of a spectrum comprising light from different uncorrelated sou...

this study is to measure the impact of the insertion of demultiplexers based on Bragg grating filter on DWDM transmission system. An optical link has been developed using a simulator system.The impact of demultiplexers on 10 Gbit/s DWDM system is investigated for NRZ-OOK coding formats. Performances of demultiplexers with different crosstalk, filter bandwidth and insertion losses are analyzed t...

In the past few years, there are many approaches to increase in the bandwidth requirements of modern telecommunication networks. This has been mainly driven by the rise in the degree of popularity of the Internet and increased ever demand of multimedia applications A router or any switch can associate into a dense wavelength division multiplexing (DWDM) by transfer packets directly onto a wavel...

Growth in internet traffic, perceived by some to be as high as 200% per annum [1], encouraged the widespread deployment of dense wavelength division multiplexing (DWDM) during the boom in optical communications between 1998 and 2001. By simply adding new wavelengths in existing fibers, DWDM was seen as a cost effective means for increasing network capacity to meet the growing demand without req...