A method for thickness monitoring and turning-point prediction during deposition of narrow band pass optical filters (NBPF) for dense-wavelength-division-multiplexing (DWDM) applications is proposed. The method is based on a recurrent approach, with relative transmittance .tting, and includes partial coherence and monochromator bandpass e.ects. We show that the partial coherence e.ects in thin ...

To meet the exploding demand for Internet and broad-band services, dense wavelength-division-multiplexing systems have been extended from long-haul transmission systems to metropolitan and access area networks. In such systems, compact and conventional arrayed-waveguide grating multi/demultiplexers are required to reduce the cost of the systems. The evolution of broadband services will depend o...

This papers show that the adoption of a duo binary Modulation scheme reduces the impact of FWM in a DWDM system. The levels of the FWM products are reduced by around 10 dB which will offer a significant performance benefit in digital systems. We have taken into consideration great demand for high data rate & have designed optical fiber system for 40 Gbps. Keywords-dispersion shifted fiber (DSF)...

The optimization of multiplexing (MUX) and demultiplexing (DMUX) 3-dB filter bandwidths for the optical differential quadrature phase shift key (DQPSK) combined with the return-to-zero (RZ) and carrier-suppressed returnto-zero (CS-RZ) is performed. The study of different optical signals in the 40 Gb/s dense wavelength division multiplexing (DWDM) system, with high spectral efficiency, is shown ...

Dec 2000 News: * Claiming a world-best speed record for optical data transmission, researchers at Siemens have transmitted 7 Tbits/s over a single optical fiber using DWDM. That's the equivalent of over 100 million telephone calls or a billion pages of typed data per second. The demonstration was conducted by Siemens' Information and Communication Networks Group at the company's Advanced Optica...

Abstract This paper presents on the design and analysis of Dense Wavelength Division Multiplexing Passive Optical Network (DWDM-PON) which is upcoming trend technology nowadays to transmit up 40 Gbps data. Various modulation techniques such as Non-Return Zero (NRZ), Return-Zero (RZ) duo binary coding are simulated in this DWDM-PON. Using OptiSystem software, DWDM-PON designed for 32 channels wi...

This work presents a performance evaluation based on elaborated analytical expressions of error probability for broadband access networkin the case of a combined technique of dense wavelength division multiplexing (DWDM) and one dimensional optical orthogonal codes (1D-OOC). Optical sources with relatively large spectrum has been considered and simulated.Besides the Multiple Access Interference...

The problem of path validation of a pure light-path in a Dense Wavelength Division Multiplexing (DWDM) optical network requires the transmission of optical impairments related parameters along the provisioned route. In this paper we propose an RSVP-TE based mechanism to collect and evaluate optical impairments measured over optical nodes along the light-path.

Dense wavelength division multiplexing (DWDM) has become the dominant transport layer technology for next-generation backbone networks due to its unprecedented capacity scalability. As a result, there is a pressing need to investigate lightpath provisioning in multidomain DWDM networks. Although inter-domain provisioning has been well-studied for packet/cell-switching networks, the wavelength d...

Dense Wavelength Division multiplexing (DWDM) is a novel technology that can improve the channel capacity and meet growing demands for bandwidth of the optical fiber communication system. This technology utilizes a composite optical signal carrying multiple information streams. Each information streams transmitted on a distinct optical wavelength onto a single fiber. The performance of DWDM is ...