A novel electronically-controllable universal current-mode biquad realisable with only three multiple-output second generation Current-Controlled Conveyors (CCCII), two grounded capacitors and one grounded resistor (which can also be implemented electronically) is presented which offers a number of advantageous features, not available simultaneously in any of the previously known electronically-controllable single-input-multiple-output type CM universal CCCII-based biquads. The proposed circuit is eminently suitable for implementation in both bipolar and CMOS/BiCMOS technologies. The workability of the new biquad configuration has been demonstrated by SPICE simulation results.
This paper proposes the combination of multiple shortest-paths routing and particle swarm optimization algorithm to solve the wavelength converters placement problem. Both equal-cost multipath routing and traffic-engineering-aware shortest-path routing are included in the experiments to examine their effectiveness in reducing the overall blocking probability. These routing schemes help to achieve network-wide load balance to ensure higher resource utilization efficiency. Computed results show that our proposed heuristic is highly effective and efficient in reducing the blocking probability in sparse wavelength conversion networks.
The simple method for the bit error probability of UWB-TH PPM multiple access systems is proposed. The multiple access interference is expressed by the characteristic function technique combined with the Gaussian approximation. The analytic results show good agreement with the results from the Monte-Carlo simulation of the system. The proposed expression can be easily modified for the performance analysis of the systems with other modulation schemes such as BPSK and/or the system in the multipath environment.
We report the demonstration of 11dB fiber-to-fiber optical gain in a silicon Raman amplifier. Pulsed pumping is employed to reduce the TPA induced free carrier losses resulting in net signal amplification. The influence of free carriers is elucidated by observing the dependence of gain on pulse energy.
We demonstrate a silicon Raman laser and report observation of simultaneous lasing at 1675nm and parametric Raman emission at 1540nm. The laser is pumped with 1540nm pulses and has a threshold at 9W peak pulse power.
We present the spot size and incident angle dependence of filtering characteristics of dielectric multilayer thin-film filters. Experimental results on amplitude responses and dispersion characteristics of narrow pass-band (50GHz) SiO2/Ta2O5 filters are presented, which are in good agreement with theory. Although noticeable deterioration on amplitude filter responses has been seen, the chromatic dispersion is reduced with decreasing the spot size of input light.