10 research outputs found
A Nine bit Mach Zehnder Interferometer based Comb Shaped Optical True Time Delay Line for Antenna Beam forming
No full textA nine bit comb shaped delay line consisting of Mach Zhender Interferometer (MZI) and MMI coupler is realized on Silicon platform at 1550nm.The device spans 35μm and offers a variable delay from 5fs to 40fs.Simulated Insertion loss of the device is -25dB. FDTD method is used for the analysis. The delayed signal is fed to the antenna array and the variation in the radiation pattern is observed
Performance Analysis of PMD/SBS, Nonlinearity and NRZ/RZ Formats in High Speed Optical Fiber Links
No full text
Abrupt Scene Change Detection
No full textA number of automated shot-change detection
methods for indexing a video sequence to facilitate browsing and
retrieval have been proposed in recent years. This paper emphasizes
on the simulation of video shot boundary detection using one of the
methods of the color histogram wherein scaling of the histogram
metrics is an added feature. The difference between the histograms of
two consecutive frames is evaluated resulting in the metrics. Further
scaling of the metrics is performed to avoid ambiguity and to enable
the choice of apt threshold for any type of videos which involves
minor error due to flashlight, camera motion, etc. Two sample videos
are used here with resolution of 352 X 240 pixels using color
histogram approach in the uncompressed media. An attempt is made
for the retrieval of color video. The simulation is performed for the
abrupt change in video which yields 90% recall and precision value
Implementation of Optical OFDM Based System for Optical Networks
No full textOrthogonal frequency division multiplexing (OFDM), a frequency division multiplexing scheme utilized as a digital multi-carrier modulation technique, implemented using optical fiber link for practical applications thereby developing optical OFDM using OptSim simulation. OFDM has many advantages over other modulation techniques such as a high resistance to inter-symbol interference (ISI) and it is robust against fading caused by multipath propagation. Optical fiber cable (OFC) as a transmission media is used for distortion less transmission of data at a very higher data speed. OFC cable has a lot of advantages over other media. And OFDM over OFC cable will provide data speeds at a very high speed and with very less losses. In this work optical transmitter and receiver for OFDM based optical network has designed for high speed data transmission over optical fiber. While modeling the system we have also used post,,pre and symmetric compensation technique to reconfigure the bandwidth along with add drop multiplexer,tunable filters and optical amplifiers to achieve high performance with minimum distortion and low bit error rate (BER).DOI:http://dx.doi.org/10.11591/ijece.v4i5.526
