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Effects of CD and first order PMD on the shape of the constellation diagrams of DQPSK systems are presented, and by quantifying variations in the constellation diagrams, a figure of merit is obtained which can be used for computing the amount of dispersion.
We experimentally demonstrate an OSNR monitoring technique for 80-Gb/s polarization-multiplexed RZ-DPSK utilizing narrowband optical filter and RF spectrum analysis. Maximum RF power increment of 19.7 dB, insensitive to CD and PMD, is measured for monitoring of OSNR up to 27 dB.
A high-speed programmable optical correlator for phase-modulated packets is demonstrated at 40 Gb/s. The system is based on the temporal analogue of the spatial 4-f correlator.
Optical multicarrier-CDMA is experimentally demonstrated for the first time. The system supports up to 256 users at a total bit rate of 15-Gb/s with almost no penalty after 70-Km transmission.
We experimentally demonstrate tunable wavelength conversion of 10 Gb/s RF-tone assisted OFDM signal with high conversion efficiency over ~30 nm tuning range using a PPLN waveguide. A penalty of < 3 dB is obtained after wavelength conversion with different QAM sizes and subcarrier numbers.
We experimentally demonstrate an RF-tone assisted OFDM transmission. Our system has a 5-dB better sensitivity compared to the conventional baseband SSB-OFDM and exhibits a negligible penally transmission after 260 km of SSMF.
We propose and demonstrate a virtual SSB-OFDM with direct detection that uses half the electrical bandwidth by employing an RF tone at the edge of the signal. We transmit 10 Gbps data with a 4-QAM over 340 km of SSMF with no penalty.
We analytically show that using PPM-OCDMA can increase the spectral efficiency of an OCDMA system up to factor of 3. Utilizing our results we generate the performance trends of PPM-OCDMA systems for varying code-sets
We have demonstrated multiple-pulse position modulation to achieve a variable bit rate OCDMA system, operating at different bit rates of 2.5, 4.3, and 5.7 Gbps, without changing pulse- width, encoders/decoders, and utilized bandwidth.
A novel, code-position modulation(CPM) that permits increase in the number of active users proposed and experimentally demonstrated. CPM-O-CDMA system with 6-asynchronous users at bit-rate 2.5 Gb/s and BER<1E-9 demonstrated to increase the bit-rate by 4X.
Most of the energy efficient routing algorithms proposed for sensor networks are reactive routing algorithms. By definition, reactive algorithms are those in which routes are constructed whenever there is data transmission. In such algorithms, to transmit data packets from a certain transmitter to the corresponding receiver, efficient route is constructed using RREQ delivery. This delivery is performed...
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